SFO - DEN

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SFO — DEN
Dec 1 — Dec 81
Round-trip
1 adult
Economy
0 bags
From?
To?
Wed 12/1
Wed 12/8

Good to know

Low season

August

High season

November

Average price round-trip

$195

Good deal round-trip

$116

Good deal one-way

$77
Best time to beat the crowds with an average 29% drop in price.
Most popular time to fly with an average 20% increase in price.
(avg. price over the last 2 weeks)
or less
or less

When to book flights from San Francisco to Denver

Estimated round-trip price
Average price per month
Flight prices as travel date approaches

Top tips for finding a cheap flight

  • Looking for a cheap flight? 25% of our users found flights on this route for $77 or less one-way and $116 or less round-trip.
  • The cheapest flight from San Francisco to Denver was found 14 days before departure, on average.
  • Book at least 1 week before departure in order to get a below-average price.
  • High season is considered to be October, November and December. The cheapest month to fly is August.
  • Morning departure is around 13% cheaper than an evening flight, on average*.
  • If you’d like to fly cheap and nonstop from San Francisco to the Denver International Airport (DEN), you can book with Frontier Airlines. This low-cost airline offers regular flights from San Francisco to Denver and allows you to save some money on your journey for your time away.
  • For anyone who has extra time on their hands before their departure from San Francisco International Airport (SFO) and who are interested in everything connected to airports and airplanes, a visit at the Aviation Museum & Library is right up the sleeve. You can find it in the main hall of the international terminal building and get access between 10:30 am and 4:30 pm.
  • Let your children use up their energy before boarding your flight from San Francisco to Denver and check out the Kids’ Spots at Terminal 3, Area F, and Area E. Tubes, toys, and interactive activities keep the little ones entertained until it is time to board.
  • Roaming through the San Francisco airport allows you to spot all the exhibited art from regional artists. The SFO Museum and Art Collection welcome and see off travelers in style with various art installations, pictures, and sculptures.
  • Pigs and dogs are usually not a common sight at airports, but at San Francisco airport they belong to the crew. The Wag Brigade consists of various specially trained dogs and a pig who give travelers a joyful (and sometimes wet) welcome and goodbye. They can be detected by their "Pet Me" vests and wagging tails while wandering through the terminals.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for booking flights from San Francisco to Denver

Top airlines flying San Francisco to Denver Intl

Scores according to KAYAK customer reviews
7.0
United AirlinesOverall score based on 68760 reviews
7.4Boarding
6.9Comfort
7.7Crew
6.5Entertainment
6.5Food
Airline reviews
Cons: "3 delays that caused a missed connection and overnight layover."
Read more about United Airlines
Cons: "3 delays that caused a missed connection and overnight layover."
Pros: "Flight was packed in like sardines. Seat was uncomfortable"
Cons: "Have passengers sir at every other seat."
Pros: "The crew was friendly and helpful."
Cons: "We were told at the gate that we would be able to purchase food on the plane, but it wasn’t the case."
Cons: "Check in was slow, I had to pay $130 for 4lbs of overweight bag, $200 to change a flight, they screwed up the first change and almost charged $200 more until I asked them to review the “quality assurance” call, the flight was delayed because they had to find a new crew, and again because of a part."
Pros: "Great flight"
Cons: "Nothing"
Pros: "A quick flight between the two cities."
Cons: "After we all boarded the plane, there was an issue to be resolved. This meant we were stuck on the plane, mostly in our seats, for an hour before we took off. This meant there were numerous people on our flight who either missed or had to run to their next flights."
Cons: "Delayed boarding, no room in overhead bins even after being charged extra for carryon and had to stuff it at my feet, even at row 15, after being charged more for that too."
Pros: "The crew was wonderful"
Cons: "My flight was severely delayed."
Pros: "Nothing at all"
Cons: "It could have been on any airline but United"
Cons: "Our plane was 2 hours late from San Francisco and we missed our flight to Columbia."
Pros: "Entertainment"
Cons: "Weird maple chip things."
Cons: "Seat could not recline and sat next to a fat person who took over my armrest and and personal space. I got sick on this flight because of everything and I never got sick on a flight before flying United"
Pros: "It was incredible to get my flight moved up so my layover was much shorter."
Pros: "Nothing"
Cons: "Travel first class during normal breakfast hours and your choice is Raisin Bran? This is the Way United cuts cost and treats there premium class members? Beyond that you are also required to pay for WiFi? I won’t bother flying United again."
Pros: "The flight was on time! That’s very important to me and I appreciate it when my time is valued."
Pros: "Surprisingly positive experience on United. Unfortunately for ANZ, they have to deal with UA as their "partner" stateside, as UA has a habit of always messing something up. On this flight, I was pleasantly surprised...the flight left on time and arrived early, the bags were a little slow but acceptable, and the crew was good. The only complaint is the typical lack of room on UA planes. Fortunately the flight was less than 2 hours."
Cons: "Lack of space. I have experienced worse on recent UA flights...at least this time my knees weren't actually touching the seat in front of me, and the person in front of me chose not to recline their seat so it stayed that way. The other issue with this flight was the boarding process, which was really slow. Fortunately, they towed the plane to the gate over an hour before departure and started boarding almost immediately so we still managed to leave on time."
Pros: "Crew was nice."
Cons: "The seats and leg room is way to small and crowded."
Cons: "Seats to small. But I am 6'3"" and my son traveling with me is 6'5"."
Cons: "Pretty sure my flight attendant was racist though I have no way of proving it. She was downright rude to me, and not a second later was overly courteous to the old, white male sitting in front of me. Also, they were really secretive about offering free drinks. Miserly a**holes didn't want to announce it so when I ordered a vodka they quietly told me it was free. So quietly in fact, that not even my wife sitting next to me heard it."
Pros: "staff were professional"
Cons: "airline overbooked the flight from SFO to DEN again. every time this happens, this leads to a huge customer disappoint and you lose faithful customers to other airlines, in the hope that the repeated overbooking won't happen again."
Pros: "The food choices were good and the service was excellent, Always kind and responsive to my needs and attentive."
Cons: "Boarding could be done by letting people with window seats being seated first, then the middle seats next and finally aisle seats last! That way people would not have to get up from their seats after they have been sitting down to get back up to allow the people in the inner seat to get to their seats a pond boarding the plane after the people in the aisle seat are already sitting!"
Cons: "Flight delayed for 50 minutes, then again for 30 minutes, then again for 20 minutes, etc..."
Pros: "A United employee working at the boarding gate who's name was Amy, (I don't know her last name) really did shine in her efforts to assist in getting my luggage and I reunited. Thanks again, Amy!"
Cons: "The flights were running behind for some reason, but I was too."
Pros: "Nothing"
Cons: "There seemed to be no planning for this flight. 1. The boarding area was way too small for the number of passengers, causing a major blockage of the moving-walkway-exit in the area. 2. We didn't start boarding until the time the flight was scheduled to take off. 3. After boarding, it took FOREVER for catering to be loaded. They seemed to do it door-by-door rather than loading all sections of the plane at the same time. Why was this not done during the boarding delay. 4. After catering was finally done, and we were ready to push back, the Captain announced that they weren't sure if they put a cargo container in the right location on the place, so had to check that....another 20-minutes of delay. I experienced lengthy delays on both ends of this travel - both by United. I will most certainly look at alternatives for my next flight."
Pros: "Courteous cabin crew."
Cons: "I pre-paid $250 to bring my pet, for my extended vacation to visit family, and was careful to book a ticket that allowed me to pre-select my window seat. After I boarded the aircraft, I discovered to my dismay, that my standard sized pet carrier did not fit under the seat in front of me. There was a metal box bolted under the seat, that significantly reduced the size of that space. Having to pay so much extra to bring my pet on board in the cabin, I would have expected United to ensure that my pet carrier would fit under the seat. Based on a previous United flight, I expected to be able to watch a free movie on my smart phone, using the United Wi-Fi entertainment, and my wireless Bluetooth earphones. This aircraft did not offer that service. Instead, there was a screen on the seat back, and a physical headphone jack. I had no way to watch anything, or even follow the aircraft position, without paying extra, and requesting wired headphones. I checked the United website prior to my flight, and saw that they provided Wi-Fi, so I was prepared to take advantage of the free United entertainment, but I was disappointed."
Pros: "- Early morning (5.20 AM) flight - everything went smoothly."
Cons: "Exact same plane from previous post.... Tail # N75435 Boeing 737-900 .... not the best bird in the fleet right now. Took nearly half the flight to get internet going, and in-seat power was not working at all."
Pros: "on time"
Pros: "Our learned expectations are so low it's hard to be disappointed"
Cons: "General indifference"
Pros: "On time departure, early arrival. Efficient and courteous service, organized boarding process"
Cons: "Wifi could be cheaper!"
Cons: "They flight left an hour and thirty minutes late so I missed my connecting flight now I'm stuck in the airport overnight NEVER FLYING UNITED AGAIN"
Pros: "No issues with getting a seat or checking in like the cheap airlines."
Cons: "Same flight as the cheap airlines. New seats are not comfortable. Row 30 was brutal at 6'1". I'd rather deal with a shitty airline."
Pros: "Got to destination safely"
Cons: "Don't fit in the seats at all I am 6'7" tall Person in front can't recline And I don't fit at all"
Cons: "It doesn't make sense to book two tickets together and end up sitting in two middle seats in different rows."
Pros: "Easy & no glitches. Luggage arrived"
Pros: "The pilot apologized profusely for our delayed departure, and offered us free in-flight TV. He made up time, and we arrived only 30 minutes late (take-off was delayed over an hour)."
Pros: "Everything and everyone was great with United Airlines. The flights were on time.. thanks"
Cons: "N/A"
Pros: "Liked United wifi and being able to watch movies to pass the time."
Cons: "Perhaps look at getting music added to United wifi"
Pros: "The gate attendant and flight crew (attendants) were nice."
Cons: "The plane had a delayed takeoff due to "mechanical difficulties". During the flight, the plane experienced VERY BAD turbulence which scared a lot the passengers. Instead of the captain coming online to assure everyone that all will be well, he maintained silence which worried a lot of passengers. I can imagine that this was traumatic for first-time flyers and children."
Pros: "It was great"
Cons: "Service was horrible."
Pros: "Person on phone who rescheduled my flight was very nice and helpful."
Cons: "Flight delay resulted in missing my connecting flight in Denver. Rescheduled flight to fly to Omaha instead. That flight was also delayed twice, and without sufficient notification for me to change flights again. didn't get into Omaha until midnight - over an hour away from my original destination."
Pros: "Landed on time."
Cons: "Cramped seats."
Pros: "Entertainment"
Pros: "Why's is there to like!!!?"
Cons: "No blanket.. No pllow"
Pros: "The fact that everything went as planned with no delays."
Cons: "Nothing"
Pros: "Efficiency. We left the gate early and arrived even earlier. Seats were comfortable enough for me to fall asleep in, enough legroom too."
Cons: "Maybe I missed it, but a little sign on every seat said there was a power outlet between the seat, but I didn't see one."
Pros: "Overall behavior of the officials and creed of the UA."
Cons: "Repeated supply of same nature of refreshments in all connecting flights."
Pros: "It was on time"
Pros: "nothing"
Cons: "united was very rude to me. they charged me twice for the same ticket and never refunded me that money."

First time flying Frontier I would fly Frontier again.

Pros: "Going to Denver"
Cons: "All good just the plane was little shaking."
Pros: "Clean, on time, reasonable"
Cons: "do not sell the middle seats"
Pros: "Procedures to check for COVID."
Cons: "It’s a pandemic and the plane was full. I thought the middle seats were not sold but full flight!"
Pros: "the plane, finally, got me where i needed to go"
Cons: "the ticket was only $47 but then i had to pay $39 for a carry on the only complimentary item given on the plane is water - they charge you for coffee the flight attendant was obnoxious, she kept making comments about how she couldnt give us anything for free the seats do not recline the air conditioning wasnt working but they loaded the plane up regardless and then after 30 minutes told us we could get off the plane while they look for the missing part that is 'somewhere' in the airport and they didnt know how long it would take for the part to be found and installed -- i dont understand why they would load people onto the plane if the plane was not working properly and they knew they needed to stall it was a very bad experience all in all"
Pros: "Leg room did not give comfort"
Pros: "The crew from checking too deplaning were incredible. My husband is disabled and we were well taken care of. Thank you."
Cons: "Not having a seat that reclines at all is really hard. I miss that, along with any complimentary food. There is flexibility in choosing seat, bags, & boarding but the price of each is a bit crazy."
Cons: "Flight was delayed 6 hrs while other flights to Denver kept taking off"
Pros: "Cheap price but you definitely pay elsewhere. Watch out for extra charges for bags, seats, and beverages. Nice staff."
Cons: "Delayed flights to and from my destination and during lay overs. When I approached staff about my connecting flight I was told I would make it. Our plane taxied into the gate my connecting flight was docked at. We waited in the plane so my connecting flight could take off. In turn I wasn't pushed to a flight 5 hours later. I left my accommodations at 6:15AM. Due to layovers and delays I will not be home until 11:15PM. Also planes required "maintenance" each time and still had no running water and jammed overhead compartments."
Cons: "I was told at check in they charge for carry on luggage had to check my bags spent more than if I had bought tickets for a nicer airline"
Cons: "Third frontier flight in a row with delays for me. Tight squeeze, uncomfortable seats, mini trays are useless, do they really have to charge even for a drink now? Probably my last frontier flight. I wish kayak posted flight amenities along with prices."
Pros: "I really appreciated that a supervisor credited me a full refund after I discovered mid-day before my 6:30 p.m. Sunday flight that the Frontier flight had been delayed, for no apparent reason, by nearly 4 hours, which would have gotten me into Denver at 1:45 a.m. Not acceptable, so I changed to a United flight, but the customer representative initially told me I could not get a refund (only a credit), but then the supervisor that I asked to speak with agreed to give me a full refund, and he was very polite and accommodating. I did appreciate that. Thank you."
Cons: "For no apparent reason, certainly not weather related, Frontier delayed their San Francisco to Denver flight nearly 4 hours, which would have gotten me into Denver at 1:45 a.m. This was unacceptable, so I switched to United, and it was much better and I got to Denver at the time Frontier was originally supposed to land. Thank you."
Pros: "Nothing"
Cons: "Flight from SFO to DEN was delayed. At check in i expressed concern about missing connecting DEN to PHL red eye (9min window) and was reassured that I "will make the flight." The flight arrived in Denver later than anticipated and the connecting red eye to PHL departed 5mins prior to landing. I was then placed on the next available flight- 5/29 at 6:55pm with arrival to PHL on 5/30 at 1am. No accomandations, re-routing options were given. I then attempted to file a complaint with the airline customer service number twice but both times no complaint was filed. The customer service rep promised to put me on an earlier flight to Trenton and refund my ticket. So I sat on the floor of the airport until ticketing opened at 4am where I was informed that no complaints were filed, I would not be refunded and the Trenton flight was not available. Also requests to retrieve my bag were ignored at the gate. I would have to spend the next 4 hours trying to locate it. I had to be in PHL today for work. I purchased a ticket on southwest."
Pros: "Fast boarding. The crew were friendly, and clearly a lot of regular commuters and travelers were on this route. More like a local bus ride. The energy was positive and the process efficient."
Cons: "My seatbelt was damaged and old. The belt was twisted, the tension clamp did not work, and the stitching on the air bag sleeve ( I was in the 1st row) was coming out. The plane had a lot of interior pieces missing, trim pieces falling of, little holes etc. I realize that this doesn't impact the over all mechanical safety - yet if they can't even replace a seat belt or fix a piece of trim how do I know that the engines and flight computers are in good shape ? I am a product developer, marketer, and also a motorcycle rider. So I understand the stats, still I don't want a janky plane ride with broken pieces."
Pros: "The price was right. I see all these complaints about the pricing scheme and just think the people who bought these tickets didn't read anything while they looked for prices. It is clear on the website that carry-on and checked bags are added fees. Even with added fees for a carry-on/overhead bag this price was $200 less than the closest competitor. Ticket was purchased the day before the flight. Nice that Frontier is also in the TSA PRE-CHECK program for screening at the airport. That was a time saver for sure."
Cons: "Seats have NO padding. For a long red eye flight, this made for an uncomfortable TOTAL of 5 hours for the combined trip. People getting on maybe don't fly much because the boarding process was hectic AND long to complete."
Cons: "I checked in early online the night before my flight only to stand in line for 45-55 minutes to drop off my bag. They also didn't have anyone working the counters until about an hour and a half before my flight departure time. Myself and about 100 others were standing in line for about 20 minutes before anyone showed up to help us check in or take our bags. I was charged a seat fee for both of my flights ( I purchased a round trip ticket) I'm pretty sure that should have been included in my initial ticket purchase. To have a carry on requires an additional fee that is more expensive than it is to check a bag. The website said these charges were to give us the best ticket prices however with all the additional fees it was significantly more expensive than their competitors. I will not fly with Frontier again."
Pros: "I really enjoyed the camaraderie i shared with my fellow passengers. Adversity really brings people together."
Cons: "Frontier as a whole, I was unaware, is a 'not good' airline. Smallest seats I've yet experienced, no recline, no legroom. If you don't want to pay $35 to check a bag, it's cool they understand, they'll happily take $40 to let you carry a bag on. Well, not happily. More begrudgingly than happily. Customer service was poor, bordering on hostile from one sky waitress in particular. It's hard to blame the airline's employees for their poor attitude, as I would be disheartened and upset if I was surrounded by a plane-full of customers vowing to 'never fly frontier again'"
Pros: "I got where I needed to be."
Cons: "Every time you click to check in, it sends you to booking. You have to switch to landscape view on your phone a few times to get it just right. Then when you do get it, it's 15 questions until you can actually just get your boarding pass. At the departures check in, there's no kiosk so you have to wait in line there too."
Cons: "I didn't like the fact that I was charged $90 for mine and my daughter's 2 carry on bags that were the size that fit in the over head bin!!! I spent hours carefully choosing the right things to fit into these tiny bags so that I could carry them on and not pay the $40 baggage fee for 1 checked bat- but it turns out I had to pay more than DOUBLE for these 2 bags that totaled much less in weight than any one bag that others were checking... VERY DECEPTIVE and WRONG!"
Cons: "Extreme weather canceled the flight. Not the problem. No next flight without my 19 year-old daughter flying alone without having to sleep in tge airport in Denver. We did not accept this. 5 days later there was an open flight. I felt Frontier should have gone further to find another airline that could have beat the five day delay, or offered a hotel voucher for an overnight in Denver. We cancelled the trip and found another airline on our own. Getting a refund: frontier web info says refund, Frontier person on the phone said refund, but cancelation email says 90-day credit. Very inconsistent messaging and not at all in the favor of my daughter. We gave Frontier a try. Sadly disappointed."
Pros: "Nothing -a nightmare trip - delayed 6 hrs in Dia -also waited 2hrs for wheelchair-dirty airplane -diaper under seat & crumbs not cleaned after paying for seat, luggage, food even water,( none of which was mentioned in booking) tips, taxi(no buses to late) cost me over $200 no service on airline. Midnite when arrived SF so no buses to Petaluma so more $ to get there At 81 yrs old I do not like to see such poor mgt No pilots, no crew, no info- was sent to 8 gates from 4 to 10 o"clock no wheelchair- I was at airport at noon- and did not see a bed until 2:30 in morning Have never had treatment like this in my life time and I have gone via Frontier many times to Minot ND HNY Ferne Axelsen"
Pros: "Literally nothing. Absolutely a hellish, terrible nightmare experience in every way."
Cons: "- Frontier literally just threw everyone's bags from over 10 different flights in a giant mess all over the airport. And then was extremely rude to their customers about it. I can't even make this up. - Frontier unloaded bags from multiple flights on the same baggage claim section, and would only partially load certain flights. For instance, they only loaded 1/2 of the bags from my San Francisco flight, and I had to wait a whole day to get my bag bag in a giant mess of bags. - People had been waiting in line for literally 4 hours to talk to someone and when I finally got to the customer service desk she was making small talk and giggling and told me to go to the back of the line and said "well you can keep on waiting" when I said maybe she should have more of a sense of urgency for these poor travelers stuck in the airport literally all day and night. This was also the person in charge of the bags - a catch employee! - They told me they would give me a refund for my cancelled flight and refused to give me a receipt for my refund. They said "we don't give receipts." - Seats were extremely tiny and uncomfortable. - When we landed at the gate we had to stay on our plane for over 1.5 HOURS just waiting to get off because there wasn't a gate available. - They made no effort to reschedule me after my flight was cancelled."
Pros: "Staff is friendly. But didn't had our snacks but if they could've handed them out should've been free."
Cons: "Honestly, I wish I could say something positive but from the time I got in line to check in to the point of landing all I was doing was getting bad news from your company. Check in line was slow and I did not have a carry-on. Gate when he switched when boarding. seats are uncomfortable In Greneral last but also do to the late take off and landing. my flight was to leave at 1055am didn't leave until 1200pm. I waiting for 2 hours after we landed to get to a gate due to weather which is unacceptable. I would have rather had a cancelled flight then go through this experience again. I have taking many flights with your company now I live on the west coast and my family is on. The east. I even signed up for a credit card expecting to take more trips. As soon as I get the card I would cancel it."
Pros: "Clean, friendly staff."
Cons: "Seats did not recline, so it was impossible to rest during this long, middle of the night flight. Misled about cost of carry-on."
Pros: "The crew made the usual "follow along on the safety cards" both informative and amusing. And while the flight was delayed for a hour and a half due to weather, the people at the kiosk kept us informed, and boarding was good. We managed to shave off about 15 minutes from when the plane was expected to land. The plane was kept clean."
Cons: "The seats weren't very comfortable, the pull down trays were smaller than my ipad mini (and that's saying something), and making me pay $2.99 for a can of soda was ridiculous. It took nearly 45 minutes for all the luggage to reach the baggage pickup, and we were the only flight picking up luggage. Check in luggage was more than I've paid for other airlines, but I figured it was to make up the cost of a $60 ticket."
Pros: "Nothing"
Cons: "Classic awful frontier service as always. This company cares about exactly one thing: showing up first for price in search results."
Pros: "On time flight"
Cons: "paying $61 total to complete check in 12 hours prior to flight including a $35 charge to check a bag, (carry-on cost was $40) and fees for each leg of the flight for a seat that did not recline. Found out on the flight that a reclining seat cost more money. Ridiculous"
Cons: "Seats not reclining, not very comfortable. To be told I had to Pay for my tiny bag to check instead of taking on plane. If I took it to the gate it would cost 60 to check at gate. Then to only be offered free water on the flight when I paid a lot for my one way flight. It seemed like a slap in the face to be told frontier is growing so fast and opening in new cities with 120 planes ordered, but they can't offer you a free juice and maybe some pretzels. I always liked frontier mainly because they were based out of Denver, but it feels like money is the only driving factor now. I fly a lot but doubt I'll fly frontier again."
Cons: "I had to pay to take my carry on bag on the plane!?! I had to pay for a soft drink or juice or coffee!?! Seriously !?! Ridiculous!! Southwest airfare is inexpensive and they don't force you to pay for every little thing so don't tell me it's due to the "cheap fare." Ps. The flight attendants were rude and unfriendly."
Cons: "The plane looked old (chipped paint, outdated upholstery). Seats did not recline. Had to pay for all baggage, carry-ons and drinks/food: this greatly increased the price of what we originally thought was a good deal on our flight."
Pros: "nothing"
Cons: "This deserves a negative star. Cut-rate experience in every way. Luggage took over an hour at DIA, and my bag didn't come out. I went to the luggage desk and they said to fill out a form and they'd get back within 48 hours. Extremely rude and disinterested treatment. They couldn't even check whether my bag made the flight etc?. After persisting they said to check ALL the carousels at DIA - it turned up on another carousel. Unpleasant way to begin my vacation - won't use them again. It also wasn't clear at booking that carry-ons are charged."
Cons: "Frontier made it very clear that it does not value its customers. I arrived a whopping 3.5 hours early to my flight from San Fransisco to Denver. I proceeded through security and my online boarding pass wouldn't scan. I was sent back to the check-in desk where I was met with 4 non-operating kiosks, a vacant check-in counter, and a sign saying they would re-open 2 hours later. What! I was soon joined by many many others who were sent back from security for the same reason. Some people had printout boarding passes that wouldn't scan at security! This was all on a Sunday afternoon, busy busy time for travel. Other complaints that severely impacted my travel experience: 1) Did not send me a flight reminder email or a boarding pass confirmation email. 2) At online check-in, Frontier charged me for my seat. The seat I already paid for! Frontier would not issue my boarding pass until I paid for my seat. That I already paid for. 3) Frontier charged me $30 for my carry-on. Get a clue Frontier! 4) The seats did not have headrests and the legroom was the smallest ever! I don't know how adult-sized people fly Frontier comfortably. 5) Frontier charges for snacks and drinks on the plane. Nothing is complimentary. Again, get a clue Frontier! I will never fly Frontier again."
Pros: "Not the strangers sleeping in my armpits."
Cons: "The worst part was we landed at 9:30 and did not get our checked bags until 11:30! We stood around for 2 hours!!!!! They said they were already 45 minutes behind to start with. How do you get that behind? You have to pay for everything, including coffee and water. We paid to check our bags at $25 online because they charge $30 for carry on. After waiting two hours for our checked bags, I sure wish I would have splurged on that $5.00! Even though we bought two tickets, to sit together we would have had to pay more, so I got the nightmare of a girl asleep in my armpit on one side and another guy on other side snoring and legs spread out across my chair. Virgin was only $40 more, would have been worth it in end!"
Cons: "I did not like that the airline did a horrible job informing the passengers what was going on after realizing that the original plane had "mechanical problems.""
Pros: "I appreciated the airline crew and staff explaining the real reasons that our flight, which could have left on time, ended up leaving 90 minutes late"
Cons: "Frontier has essentially lost their ground crew in Denver because their new owners, a holding company, is engaging in "cost-cutting measures" that has decimated staffing and morale"
Pros: "I arrived alive, but that's about it."
Cons: "Over an hour delay in leaving SFO due to poor management (the passengers deplaning from our plane had been kept on the Tarmac for 2 hours before being release b/c Frontier could not find a gate for them). Then a 2 hr 20" flight took 20" longer. To add insult to injury, we were ot offered so much as a glass of water but would be allowed to purchase one. There was a lengthy delay deplaning as we allowed the passengers with connecting flights (half the plane) to deplane first. The we waited over an hour to claim our baggage, after the carousel was changed 3 times. I will not fly Frontier again!"
Cons: "Frontier charges for everything. At check-in the attendant told me I could either bring my bag on the flight for $45 or check it for $40. I wish I knew all this before booking my ticket. I would've just paid extra for a different airline. At least I would've had better service. Every Feontier employee I came into contact with was either jaded or grumpy, as if hey hated their jobs, which made the experience even worse. All of my flights were delayed for whatever reason, and dealing with the staff made the experience that much worse. Most of them were so rude!"
Pros: "Great pilot, the plane hit some sever turbulence as we approached Denver International airport. I wasn't concerned since this was a new aircraft but if it was an older one it would have sustained structural damage. The pilot aborted the landing and flew over Denver and came in from a different direction. Everyone on the plane cheered when the pilot landed the plane safely."
Cons: "I was charged a fee to select a seat, not one with more leg room just any seat. Also, I was charged $40. for just one carry on. In addition on this new AIRBUS 320 the seats are so close together in the rows that they should issue a warning that if you are taller than 6 ft. 3 in. you won't be able to sit in the seat because your knees will be in contact with the seat in front of you. I'm 6 ft. 4 in. so luckily this was only a 2 hour flight. I also choose an aisle seat so I could put my feet in the aisle."
Cons: "I was charged $45 foo my portfolio, because the gatekeeper thought that my portfolio was too big to fit under the seats. if I did not paid the fee I could not board the plane. the plane in Denver was already late and then gates were change with very little information notification to us."
Pros: "Absolutely nothing"
Cons: "Hidden fees (you pay to pick your seat! you pay for carry on!) jacked the price of this flight up $100. Would have appreciated knowing that these fees existed before booking. Customer Service was nonexistent. Absolutely NOBODY could change my ticket after 12 hours of delays made it impossible for me to make it to my connecting flight to my final destination. I tried the customer service center, the gate, calling corporate, the gate again, customer service again. NOBODY COULD DO IT! I am still in Denver and have not made it to my final destination."
Pros: "My bags did arrive, thankfully."
Cons: "Exorbitant fees on all baggage, zero amenities, unnecessary delays, poor airline coordination, non-reclining seats, extra charges for everything that isn't water or using the bathroom. Will never book another flight with Frontier."
Pros: "I made it alive"
Cons: "Everything else. We left late (couple hours), the attendents said looking like a 7:15 departure... No update...8:10 departure, ran out of the snack items we wanted, no wifi, uncomfortable chair, no entertainment, arrived but then sat on Tarmac, again attendent said just a few minutes but 25 later we moved to gate just to wait for the crew that wasn't there yet. Seemed really super unorganized and would have been better if they just told us straight up how long it was going to take. Cost me a whole bunch of money. I would have just flown the next day and skipped a night at a hotel, a car rental, taxis and we were so late we didn't even get to eat before bed. Absolutely the worst flight ever. Hard to believe since it is only two hours and I travel a lot! Won't be traveling Frontier again."
Cons: "Told at the checkin desk it's $35 per person to "confirm our seats" -- two in the exit row as all that remained. Why? I paid $250 per person to confirm I wanted on the aircraft. I showed up 1.5 hours early to check in. Also told at the desk it's $40 per checked bag ($45 per carry on!). So when I get to the airport I'm forced to pay $150 more, just to fly to my destination. Credit card only. The lady checking in next to me paid me cash so I'd help her pay her extra fees. Not how to treat your customers. That's what I call a scam. If all this was in the small print, I missed it, and it was tough to find, having booked through Kayak. Won't be duped again. Goodbye, Frontier."
Pros: "The ticket price was affordable."
Cons: "A checked bag is nearly twice as expensive as other airlines I have flown. A carry on bag can cost 45-60 dollars depending on when you buy it at the airport. If there is overhead space open, it should be used by any passenger. If the overhead space runs out, give free checked bags at the gate. Also, don't offer a seat upgrade for an emergency row for $50. Seats don't recline, and are very cheap and uncomfortable. No complimentary snacks or drinks."
Cons: "I was shocked to discover: $40 fee for ONE carry on bag, $35 to check, $1.50 per beverage, TINY tray "tables", seats do not recline, fees for any choice of seat (except middle in back next to rest room). They do not deserve to be listed on equal footing as other airlines that have much more reasonable notions of the bare minimum a ticket includes."
Pros: "This was one of the best flights I've ever taken. The flight crew and pilots were really friendly and accommodating. The flight itself was smooth and quick and the staff at the airport was efficient and helpful."
Cons: "The tray tables behind each seat are too small and you can barely use them if the person in from of you is reclining their seat."
Pros: "Nothing. Seriously not one aspect."
Cons: "Lost my bag, deceivered poor customer service tgroughout the experience, limited flight options, no WiFi, pay for carry on bags, no trays for laptops in front of chairs."
Pros: "Didn't like the "bait and switch " tactics Feontier does. Having to pay for a seat assignment and for brining a bag was ridiculous. The total cost of round trip seat assignment and bag charges was $122.00!!! This add-on was never mentioned in the price shown on Kayak's site. This add-on was an extra 31% of the "advertised" price shown on Kayak! This important information should have been mentioned on the comparative quote given so a more realistic price comparison decision could be made. I won't be using Frontier again."
Pros: "Honestly, I can't think of one thing I really like. The restrooms were clean..."
Cons: "I felt the check in process on the website was misleading. I had to read multiple times for carrying on my bag, and ended up paying $30 because I thought if I didn't pay while checking in on line that I would end up paying $60 at the gate to carry on."
Pros: "The crew was friendly and the plane was clean. Seats aren't too bad either."
Cons: "This is the only airline I know of that charges for a carry on bag as well as non-alcoholic beverages. Also, the charging for seats is ridiculous."
COVID-19 information

Safety measures for airlines flying from San Francisco to Denver

Airlines flying from San Francisco to Denver have enacted additional safety measures and adjusted policies to better accommodate travelers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters on flights from San Francisco to Denver

Mandatory masks

Masks required on board, masks provided on flights from San Francisco to Denver

Social distancing seating

Middle seats unavailable to book on flights from San Francisco to Denver

Pre-flight testing

Testing for antibodies, testing for symptoms for flights from San Francisco to Denver

Flexible cancellations

Waiving of change fees. Search flexible flights from San Francisco to Denver

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Recent round-trip flight deals

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nonstopFrontier
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12/8Wed
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2/18Fri
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12/20Mon
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San Francisco - Denver Flights

Departure:

San Francisco (SFO)United States

Destination:

Denver (DEN)United States

Return flight deals:

Denver - San Francisco

Cabin classes:

$624
$645
$468
$56

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