SFO - DEN

$48 Find Cheap Flights from San Francisco to Denver

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Francisco to Denver departing on 3/16. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Denver

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Denver.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Denver.
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Everything you should know

Cheapest round-trip
$86
Overall average: $216
Frontier
Mon 3/2Wed 3/4
SFO - DEN • 1 stop
Cheapest non-stop
$87
Typical prices: $113-$321
Frontier
Thu 2/26Sun 3/1
SFO - DEN • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
Frontier's Premium Bundle offers priority boarding.
Southwest includes two free checked bags for travelers.
Expert advice
Expert advice
Expert advice
Expert advice
Video guide: How to find cheap flights to Denver
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When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 23% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 18% price drop
June
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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Flight Deals
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Expert advice
Flight Deals

Cheap Flights from San Francisco to Denver (SFO-DEN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Francisco to Denver that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Francisco to Denver

Mon, Mar 2 - Wed, Mar 4
Frontier Logo
8:18 pm - 7:54 am
SFO
-
DEN
10h 36m
1 stop
Frontier Logo
10:29 pm - 12:28 am
DEN
-
SFO
2h 59mnonstop
$86Frontier
Thu, Feb 26 - Thu, Mar 5
Frontier Logo
6:15 am - 10:02 am
SFO
-
DEN
2h 47mnonstop
Frontier Logo
6:00 am - 8:03 am
DEN
-
SFO
3h 03mnonstop
$87Frontier
Sat, Feb 21 - Wed, Feb 25
Frontier Logo
8:58 am - 12:38 pm
SFO
-
DEN
2h 40mnonstop
Frontier Logo
10:29 pm - 12:28 am
DEN
-
SFO
2h 59mnonstop
$88Frontier
Fri, Feb 27 - Sun, Mar 1
Frontier Logo
6:15 am - 10:02 am
SFO
-
DEN
2h 47mnonstop
Frontier Logo
6:00 am - 8:03 am
DEN
-
SFO
3h 03mnonstop
$89Frontier
Wed, Mar 11 - Sun, Mar 15
Frontier Logo
9:04 pm - 12:37 am
SFO
-
DEN
2h 33mnonstop
Frontier Logo
10:29 pm - 12:28 am
DEN
-
SFO
2h 59mnonstop
$91Frontier
Wed, Feb 25 - Wed, Mar 4
Frontier Logo
7:15 pm - 3:56 am
SFO
-
DEN
7h 41m
1 stop
Frontier Logo
10:29 pm - 12:28 am
DEN
-
SFO
2h 59mnonstop
$92Frontier
Mon, Mar 9 - Tue, Mar 10
Frontier Logo
9:24 pm - 3:56 am
SFO
-
DEN
5h 32m
1 stop
Frontier Logo
6:11 pm - 8:09 pm
DEN
-
SFO
2h 58mnonstop
$93Frontier
Tue, Feb 24 - Fri, Feb 27
Frontier Logo
6:55 am - 10:42 am
SFO
-
DEN
2h 47mnonstop
Frontier Logo
6:00 am - 8:03 am
DEN
-
SFO
3h 03mnonstop
$96Frontier
Wed, Feb 18 - Sat, Feb 28
Frontier Logo
6:55 am - 10:42 am
SFO
-
DEN
2h 47mnonstop
Frontier Logo
10:29 pm - 12:28 am
DEN
-
SFO
2h 59mnonstop
$97Frontier
Thu, Mar 12 - Thu, Mar 19
Frontier Logo
9:04 pm - 12:37 am
SFO
-
DEN
2h 33mnonstop
Frontier Logo
10:29 pm - 12:28 am
DEN
-
SFO
2h 59mnonstop
$98Frontier
Booking Insights

KAYAK's insights & trends for San Francisco to Denver flights

Get data-powered insights and trends into flights from San Francisco to Denver to help you find the cheapest flights, the best time to fly and much more.

Find cheap flights to Denver
Find cheap flights to Denver

Planning a trip from San Francisco to Denver? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

What’s the cheapest day of the week to fly from San Francisco to Denver?

The average price of all round-trip flights from San Francisco to Denver clicked on KAYAK for each day over the last 12 months.

When flying from San Francisco to Denver, you should consider leaving on a Friday and avoid Sundays if you are looking for the best rates. For your return to San Francisco, you’ll find the best rates on Fridays and the most expensive ones on Mondays.

What is the cheapest month to fly from San Francisco to Denver?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Francisco to Denver, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Francisco to Denver is February, where tickets cost $198 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $299 and $277 respectively.

How far in advance should I book a flight from San Francisco to Denver?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from San Francisco to Denver, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from San Francisco to Denver, you should book around 2 weeks before departure, which saves you about 23% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Expert advice

Expert advice for your flight from San Francisco to Denver

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Frontier and United Airlines

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Blane Bachelor

Blane Bachelor

Expert on Southwest and SFO

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Harriet Baskas

Harriet Baskas

Expert on DEN

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

KAYAK's tips to save more on a San Francisco to Denver flight

For those planning to fly from San Francisco to Denver, it's worth noting that Tuesdays and the month of September are generally the cheapest times to travel. Here are some tips to help you save money on this route:

Booking Advance: Try to book your flight at least 20 days in advance for the best prices.

Cheapest Airline: Frontier Airlines generally offers the cheapest flights on this route.

Direct Flights: Direct flights are significantly more expensive, so consider flights with layovers to save money.

Route Selection: The route from San Francisco to Denver is typically the cheapest.

Airline Selection: Consider flying with Frontier, as they generally offer the cheapest direct flights.

AI-powered; AI can make mistakes.

Good to know

Low seasonNovember
Cheapest flight$48
Best time to beat the crowds but there is an average 6% increase in price.
Most popular time to fly with an average 13% increase in price.
Flight from San Francisco to Denver

When to book flights from San Francisco to Denver

Are your dates flexible? Find out the best times to travel from San Francisco to Denver based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from San Francisco to Denver

  • How do I get from Denver Airport to downtown Denver?

    The RTD bus service connects Denver Airport with the city and departs every 15m from the airport. The bus stop is located at the DEN Transit Center at the south end of Jeppesen Terminal. There is also an information counter in the arrivals hall if you have any questions about routes, fares, or directions. Day passes can be purchased for approximately $9 in cash (no change given) at the bus driver or with credit cards at the ticket machines.

  • Where can I eat at Denver airport after I’ve landed?

    If you land at Jeppesen Terminal and fancy authentic American cuisine, opt for the Boulder Beer Tap House at level 5 on the west side of the terminal. Here you can consume scrumptious snacks, warm dishes, and craft beer. For Mexican food, the Cantina Grill at level 6 is also a good option to get something hearty to eat.

  • Where can I find the car rental center at Denver airport?

    Explore the city and its surroundings conveniently with your own four wheels and rent a car directly from one of the companies located at the airport. The airport has its own car rental center which can be reached with a courtesy shuttle departing from Jeppesen Terminal at level 5, island 4. Companies operating at the airport include Avis, Thrifty, and Enterprise, which are at your service 24/7.

  • Is there a hotel at Denver airport?

    The Westin Denver International Airport Hotel is just a few steps from the terminal building and provides transit flyers, late arrivals, or early departing passengers with a nearby bed. Apart from its over 500 rooms, the hotel boasts a conference center, pool, and gym, as well as various restaurants.

  • Where can I park at San Francisco International Airport?

    If you want to park at SFO before your trip to Denver, your best option is to park in Long-Term Parking. You can book your parking in advance to ensure you get a spot. To get to the terminals, board the AirTrain Blue line in the Long-Term Parking Garage on Level 5.

  • Does the San Francisco International Airport have an onsite hotel?

    Sort of. SFO has Nap Rooms that are available landside on Level G in the Main Hall of the International Terminal. Each room has a bed, mirror, desk, and free Wi-Fi. Showers cost extra. Open 6:00 am to 11:00 pm, Nap Rooms charge in 15-minute increments or hourly after the first 2 hours.

  • Does the San Francisco International Airport have a USO?

    Yes. Active-duty members of the US military and their dependents can enjoy the USO lounge for free, located in Terminal 1, landside on the Mezzanine Level. Some amenities include a comfortable TV lounge, devices for connectivity, luggage storage, reading material, Xbox, refreshments, a nursery, some overnight facilities, and more.

  • Does the Denver International Airport provide facilities for nursing moms?

    Yes. DEN offers Nursing Rooms that provide privacy, a sink, comfortable seating, a diaper changing table, and outlets. One is in the middle of the Jeppesen Terminal on Level 5. Other Nursing Rooms can be found in the center of Gates A, B, and C. Utilize the intercom next to each room to gain access.

  • Are there any pet relief stations at Denver International Airport?

    Yes. If your pet or service animal needs to go as soon as you deplane, you can use the indoor pet relief stations that are at the center of the A, B, and C Concourses. When you exit the Jeppesen terminal at Door 200, you will find an outdoor pet relief area.

  • Does the Denver International Airport offer any massage services?

    Yes. If you want to ease cramped muscles or get that crick out of your neck after your flight from SFO, you can get a massage at DEN at the A Massage spa, located on the Mezzanine level at the B Gates, airside. You could also enjoy massage and reflexology at the Colorado Oasis spa in the center core of the C Gates, airside.

  • What is the cheapest flight from San Francisco to Denver?

    In the last 3 days, the lowest price for a flight from San Francisco to Denver was $48 for a one-way ticket and $86 for a round-trip.

  • Do I need a passport to fly between San Francisco and Denver?

    No, a passport isn't needed to fly from San Francisco to Denver. However, local authorities might ask for an official ID.

  • Which airlines offer Wi-Fi service onboard planes from San Francisco to Denver?

    Alaska Airlines, JetBlue, Delta, and American Airlines offer inflight Wi-Fi service on the San Francisco to Denver flight route.

  • Which aircraft models fly most regularly from San Francisco to Denver?

    The Airbus A321neo is the aircraft model that flies most regularly on the San Francisco to Denver flight route.

  • Which airline alliances offer flights from San Francisco to Denver?

    SkyTeam, oneworld, and Star Alliance are the airline alliances operating flights between San Francisco and Denver, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from San Francisco to Denver?

    There are nonstop flights from San Francisco to Denver on a daily basis.

  • Which is the best airline for flights from San Francisco to Denver, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from San Francisco to Denver are Southwest and Delta. With an average price for the route of $283 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $276 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from San Francisco to Denver?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Francisco to Denver.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Francisco to Denver?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from San Francisco is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Francisco to Denver?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Denver with an airline and back to San Francisco with another airline. Booking your flights between San Francisco and DEN can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Francisco to Denver?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver from San Francisco up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from San Francisco to Denver

  • Looking for a cheap flight? 25% of our users found flights on this route for $139 or less one-way and $216 or less round-trip.
  • 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.
  • If you are taking an Uber when you land at the Denver International Airport (DEN), use the Ride App Pick-Up signs to guide you to your car and driver on Island 5 at Level 5. Uber SUV or Uber Black will meet you on Island 2 at Level 5.
  • If you want to relax at the San Francisco International Airport (SFO) before your light your flight to Denver, consider stopping by one of the Yoga Rooms. Open 5:00 am to 11:00 pm, Yoga Rooms are in Terminal 2 at Boarding Area D or in Terminal 3 by Gate 69.
  • If you have downtime at SFO and would like some entertainment, stop by the Movie and Portable Entertainment Rentals, where you can rent movies, games, and electronics. Open 8:00 am to midnight, these facilities are located in the Main Hall of the International Terminal and near Gates 71 and 80 in Terminal 3.

Prefer to fly direct from San Francisco to Denver?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from San Francisco to Denver Intl.
Find which airlines fly direct from San Francisco Airport to Denver Intl Airport, which days they fly and book direct flights.

Direct departures

San Francisco to Denver Intl

Monday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Tuesday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Wednesday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Thursday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Friday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Saturday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Sunday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

See more direct flights

Direct returns

Denver Intl to San Francisco

Monday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Tuesday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Wednesday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Thursday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Friday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Saturday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

Sunday

Frontier, Southwest, United Airlines

Frontier, Southwest, +1 more

See more direct flights

Reviews of the top 5 airlines serving from San Francisco to Denver

 
See real verified KAYAK customer reviews for airlines flying from San Francisco to Denver. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from San Francisco to Denver? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4267 reviews
7.5Entertainment
8.1Boarding
8.0Comfort
8.6Crew
7.0Food
Airline reviews

Great flight but super high price. Glad it was a business trip and not personal

10.0 ExcellentPieter, Jan 2026
LGB - DAL
Read more Southwest reviews

Great flight but super high price. Glad it was a business trip and not personal

3 hour delay. Had to change plans and was still delayed.

We got exit row seats both flights. Everything was running on time

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Crew could have been friendlier, maybe I'm spoiled by SW crews. In flight wifi was good. Would be nice to have more food offerings on a 4 plus hour flight

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

The flight was delayed by two de-icings. The seatbelt did not work correctly. It did not stay tight.

Hotter than Hades in August. Why, why do crews think that in the winter when we are already dressed for cold weather we need a cabin that is 82 degrees. Even the vents were blowing hot air.

Flight was delayed. De-icing took a while. When we landed had to wait for another plane to vacate our gate. Just an overall bad experience.

Not good - outbound flight was delayed and missed my connection even though I got to the gate after running through the airport - the agent would not let me on because the door was closed (flight had not left). There was no notification from United - overall experience was very disappointing. Additionally, I was downgraded from first class to coach on the alternative flight

United have really come back. Airport and boarding process is clear and good, app and information also very good

The entertainment available didn’t work for anyone on the flight. Long 6 hr flight with no entertainment option and the staff didn’t know until an hour into the flight when we made sure they knew about it. They had no way to fix it.

Late FA meant slow boarding. WiFi did not work. I’m a medium plus sized passenger. The seatbelt was for the first time ever barely fitting. And we delayed on the tarmac 40 min

My husband and I had boarded the flight from Denver to Chicago, and one of the last passengers to get on the plane opened the overhead bin above my husband's seat and threw his bag out of the bin to make space for his own. He said, "Mine is bigger!" The flight attendant supported the new passenger. They didn't care that my husband has two artificial knees and must have the foot room in front of his seat to be able to fit his legs in -- and to be able to stand, much less walk, at the end of the flight. I have never seen this happen before, and it was a disaster.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

Had to cancel first flight because Airporter Bus took over 3 hrs to get to airport which resulted in an extra $378 dollar fare . Is there anyway I can be reimbursed for initial fare since it was not my fault? Sent from my iPhone EJ Ledet

Don't change gate multiple times make people run across the airport. Announce delays in a timely manner. Have maintenance crew ready. Don't delay and keep passengers on the plane for 3 hrs. on tarmac.

The flight attendant use 1.5 hours to answer my call. My dirty food tray was unattended.

The entertainment options were at best, fair. It was exactly the same as my outbound flight. It would have been more entertaining if there were some series from Apple TV, HBO, Showtime or other carriers for me to catch up with.

My seat tv didn’t work the whole trip. And the seat space is too small despite being seated at the front.

The flight was on time and arrived early. The crew were friendly and helpful.

Overall experience was great. Flights were almost on time in departing and we arrived at our destination as scheduled. No issues with amenities or flight crew. Everything went well as as expected. Will fly again with American Airlines in the future!

Horrible. Both legs of my flight were delayed more than 6 hours. No compensation, no screens on the plane, and the plane was not clean.

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

Flight was delayed leaving Dallas. Arrived about 2 hours later than scheduled.

The flight was flawless and we even arrived between 20 and 25 minutes early!

It was fine. Nobody was outstandingly friendly but no one was rude and everything was smooth . The captain thanked us for flying but no one greeted me as I walked on the plane or as I exited which is the least they could do lol

Clean, friendly, roomy. But check-in from the phone link was terrible. Repeated attempts wouldn’t save at the final step. Just kept spinning! It was very frustrating. Finally, I used the app (vs website link) to check-in which worked very smoothly on the first attempt.

Check in on the web portal was cumbersome! After several attempts I finally got the boarding pass.

Excellent flight and even arrived 23 min early. No entertainment , or wi fi on board, but I downloaded a couple of movies beforehand which kept me entertained. Really like flying Allegiant airlines.

WE were delayed about an hour and never any communications from the employees working the gate. We also were moved to a total of three gates.

I love how they show love to their customers and care about them too.

I liked how when I got on board how fast we ended up taking off but what I truly disliked was how uncomfortable the seats were. There was truly never a time that I could ever get comfortable during both of my flights. The seats could get away during shorter flights but flights 3 hour plus makes it hard to enjoy.

The crew was great and the flight was very smooth. Can’t really judge food since I did not get any because it costs money. The seat was comfortable for what we bought. Thanks!

Crew was great. No entertainment and food and beverage was for purchase only, even water

It was canceled. The flight wasn’t rescheduled, everyone had to figure out their own new arrangements. They said we would get refunded our original fare and receive an additional $150. We received links for $100 only and they expired before we could activate them.

It was costly and difficult to check in. $85 to take a small suitcase with me, carry on or checked and $75 on the return trip, Plus $25 if I didn't check my self in check in $25, because I couldn't do it on the kiosk. Small very uncomfortable seats, waited on the runway for near an hour each way. It was my worst flight to date.

Due to weather, my flight was delayed, further delayed, then canceled. I eventually got through to a support person who helped me find a different route out of MSP, but to get to DIA, they didn't want to, but eventually did help with the connection ticket purchase. But even this replacement flight was delayed time and time again, and I would have missed my connecting flights and I didn't want to get stuck in a layover city, so after 12 hours at the airport with two young boys who were very tired, we just cancelled our plans and spent the week at home, instead of Nana's.

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

Seats were new and comfortable. Staff was fine. Missed my connection due to weather -which wasn’t their fault- but got no help at all. Gate staff sent me to customer service, which was and stayed unstaffed. Sign with QR code directed me to call or chat. Chat was useless. Call was returned after an hour. No itinerary offered by Frontier could get me home in less than 30 hours. Rebooked with another airline and got a partial refund that came to about 10 percent of what I paid to get home.

The experience was good. No frills but I got there safe and sound and on time.

As every law enforcement agency I could imagine surrounded the plane and we didn’t disembark for 2 hours and then had to stick around for another hour to go get our personal belongings after leaving them behind and being bused away from the plane, it was scary and inconvenient. We were given no information as to why this was happening. Lack of communication with passengers was disappointing.

Frontier Airlines was AWFUL. I was an hour early for my flight and the lady refused to check me in. I had to purchase a whole new ticket with a different airline.

Late, terrible communication, horrible planning of passenger seating until the literal last minute. One of the worst flying experiences of my life. Y'all suck

First of all, we never got on the connecting flight to Denver. They delayed our flight for two hours. If we would have gotten on that flight, we would have been stuck in Denver for 13 hours. So we re- routed our flight for a straight through flight to Oklahoma two days later. THEN, they delayed that flight for two hours. After that we were able to finally get on our flight and come home. Frontier Airlines - one of the worst airlines I have ever been on.

Terrible communication with weather delay, lost baggage, near impossible to reach customer service

Everything you need to know for your flight from San Francisco to Denver

Other airlines flying from San Francisco to Denver

Flights from the other most popular airlines that fly from San Francisco to Denver according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.