DEN - SFO

$53 Find Cheap Flights from Denver to San Francisco

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to San Francisco departing on 3/18. 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 San Francisco

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to San Francisco, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to San Francisco, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$95
Overall average: $202
Frontier
Wed 4/22Wed 4/29
DEN - SFO • Non-stop
Cheapest one-way
$53
Typical prices: $106-$199
Frontier
Wed 3/18
DEN - SFO • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Southwest offers two free checked bags for family travel.
Use DEN Reserve for faster security at Denver Intl.
Expert advice
Expert advice
Expert advice
Expert advice
Nonstop flights
Every day
You can fly direct with Frontier, Southwest and United Airlines. Average duration is 2h 54m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Avoid delays
United Airlines
Most punctual • 82% on-time
Morning flights
Best time • Fewest delays
Insights
Insights
Insights
Insights
Top layover airports
Ontario (ONT)
Cheapest • Avg $148 (round-trip)
Phoenix (PHX)
Shortest trip • 5h 06m (one-way)
Insights
Insights
Insights
Insights
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 29% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
April
Cheapest • 17% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to San Francisco!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Denver to San Francisco 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 Denver to San Francisco

Wed, Apr 22 - Wed, Apr 29
Frontier Logo
9:30 pm - 11:25 pm
DEN
-
SFO
2h 55mnonstop
Frontier Logo
7:00 am - 10:48 am
SFO
-
DEN
2h 48mnonstop
$95Frontier
Tue, Apr 21 - Tue, Apr 28
Frontier Logo
9:25 pm - 11:25 pm
DEN
-
SFO
3h 00mnonstop
Frontier Logo
7:40 pm - 3:59 am
SFO
-
DEN
7h 19m
1 stop
$97Frontier
Mon, Apr 13 - Tue, Apr 14
Frontier Logo
10:30 pm - 12:23 am
DEN
-
SFO
2h 53mnonstop
Frontier Logo
6:00 am - 9:42 am
SFO
-
DEN
2h 42mnonstop
$100Frontier
Tue, Mar 10 - Mon, Mar 16
Frontier Logo
6:11 pm - 8:09 pm
DEN
-
SFO
2h 58mnonstop
Frontier Logo
6:00 am - 9:47 am
SFO
-
DEN
2h 47mnonstop
$102Frontier
Tue, Mar 10 - Mon, Mar 16
Frontier Logo
6:11 pm - 8:09 pm
DEN
-
SFO
2h 58mnonstop
Frontier Logo
6:41 pm - 9:25 am
SFO
-
DEN
13h 44m
1 stop
$103Frontier
Tue, Mar 17 - Tue, Mar 24
Frontier Logo
10:29 pm - 12:28 am
DEN
-
SFO
2h 59mnonstop
Frontier Logo
6:00 am - 9:47 am
SFO
-
DEN
2h 47mnonstop
$105Frontier
Fri, Apr 17 - Tue, Apr 21
Frontier Logo
6:26 am - 9:13 pm
DEN
-
SFO
15h 47m
1 stop
Frontier Logo
8:40 am - 12:30 pm
SFO
-
DEN
2h 50mnonstop
$106Frontier
Fri, Apr 24 - Sun, Apr 26
Frontier Logo
10:29 pm - 12:27 am
DEN
-
SFO
2h 58mnonstop
Frontier Logo
6:00 am - 9:47 am
SFO
-
DEN
2h 47mnonstop
$107Frontier
Thu, Apr 23 - Mon, Apr 27
Frontier Logo
10:29 pm - 12:22 am
DEN
-
SFO
2h 53mnonstop
Frontier Logo
6:00 am - 9:42 am
SFO
-
DEN
2h 42mnonstop
$108Frontier
Wed, Apr 15 - Sun, Apr 19
Frontier Logo
9:30 pm - 11:25 pm
DEN
-
SFO
2h 55mnonstop
Frontier Logo
6:00 am - 9:42 am
SFO
-
DEN
2h 42mnonstop
$110Frontier
Booking Insights

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

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

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

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

If you are looking for a flight deal from Denver to San Francisco, look for departures on Fridays and avoid leaving on a Monday, as it's usually the priciest day. When flying back from San Francisco, Tuesday is the cheapest day to fly and Sunday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to San Francisco, 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 Denver to San Francisco is April, where tickets cost $202 (return) on average. On the other hand, the most expensive months are July and November, where the average cost of round-trip tickets is $285 and $281 respectively.

Can I save money by flying with a layover from Denver to San Francisco?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $272 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Denver to San Francisco, 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 Denver to San Francisco, you should book around 3 weeks before departure, which saves you about 29% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Expert advice

Expert advice for your flight from Denver to San Francisco

 
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 Denver to San Francisco flight

The most affordable time to fly from Denver to San Francisco is generally on a Saturday in September.

Cheapest Route: The Denver to San Francisco route is the most cost-effective.

Booking Time: Book at least 90 days in advance to get the best prices.

Budget Airline: Frontier Airlines typically offers the cheapest flights for this route.

Flight Type: Direct flights are generally more expensive, consider flights with layovers to save money.

Flight Type: Direct flights are typically more expensive, consider flights with layovers for savings.

AI-powered; AI can make mistakes.

Good to know

Low seasonJanuary
Cheapest flight$53
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from Denver to San Francisco

When to book flights from Denver to San Francisco

Are your dates flexible? Find out the best times to travel from Denver to San Francisco 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 Denver to San Francisco

  • Are there onsite hotels at San Francisco International Airport?

    While there are no hotels directly onsite at San Francisco International Airport, travelers with flights from Denver to San Francisco will be happy to hear that there are a number of hotels within close proximity. The Westin San Francisco Airport, Aloft San Francisco Airport, and San Francisco Airport Marriott Waterfront are all within two miles of the airport and offer free transportation to and from the airport.

  • Can I fly from Denver to San Francisco non-stop?

    Frontier Airlines and United Airlines both offer direct flights from Denver to San Francisco. Other airlines like Delta Air Lines and American Airlines offer one-stop flights with layovers in cities like Salt Lake City for Delta Air Lines and Phoenix for American Airlines.

  • What facilities are available for travelers with pets at San Francisco International Airport and Denver International Airport?

    In San Francisco International Airport there are seven pet relief areas available in the airport - in the Arrivals areas of Terminals 1, 2, and 3, plus there is an additional post-security pet relief area in each terminal, with Terminal 1 featuring yet another extra one. At Denver International Airport there are four pet relief areas: one in each core gate area for Gates A, B, and C, and then another one outside of Jeppesen Terminal.

  • Should I fly to San Francisco International Airport or Oakland International Airport?

    San Francisco International Airport and Oakland International Airport are both connected to BART, making them easily accessible for travelers who plan to use public transportation. However, San Francisco International Airport sits on the eastern side of the bay, while Oakland International Airport is on the western side of the bay. Thus, whether your final destination is on the eastern or western side is often the deciding factor when choosing which airport to fly into.

  • Does Denver International Airport offer a mood-boosting pet program for weary travelers?

    DEN understands that getting to the airline hub in time and navigating the maze of security and passport control can be stressful. The airport's animal therapy program, the Canine Animal Therapy Squad (DEN CATS), will brighten your day with a furry cuddle. You will encounter this dog squad donning violet 'Pet Me" vests throughout the airport.

  • What are the eco-friendliest airlines flying this route?

    Roughly 1717 lbs. of carbon is released on flights from DEN to SFO. Nonstop flights are eco-friendlier than layover flights on this route. If you wish to travel in an environmentally-responsible manner, consider booking flights with the eco-friendliest carriers on this route, United Airlines and Frontier. They release 41% and 39% less carbon, respectively.

  • Does San Francisco International Airport offer any support services for commuters with limited mobility?

    Yes. SFO wants all passengers at the airport to have equal access to their facilities. It has therefore invested in accessible services and amenities like TTY telephones at all terminals' baggage claim/Arrival levels. The airport's AirTrain is also wheelchair-accessible, and service animals are permitted. Be sure to state all of your requirements when booking your ticket.

  • What are some good hotels near Denver International Airport (DEN)?

    If you want to be on time for your Denver to San Francisco flight, spending the night at the nearby accommodations would be best. A good option is the Westin Hotel at Denver International Airport, an onsite hotel adjoined to DEN's Jeppesen Terminal. Holiday Inn Express Denver Airport and Hyatt House Denver Airport are other surrounding hotels with drop-off services.

  • Where is the San Francisco International Airport (SFO) car rental centre?

    You will want an SFO car rental to evade public transport inconveniences like unreliable schedules. You can easily obtain one at the rental car centre on McDonell Road- the AirTrain's Blue Line services connections from the airport. The AirTrain runs round-the-clock and leaves from the AirTrain departure level near baggage claim.

  • What are the inter-terminal transfer options at San Francisco Airport?

    SFO is home to four terminals (3, 2, 1, and International) and 115 gates within its seven concourses (A-G). If you wish to transfer to the International Terminal from Terminals 2 and 3, there is a connector walkway whose entrance is in Terminal 3, close to Gate G1. You may also use the AirTrain to the International Terminal A Station from Level 3 of Terminals 3 and 2.

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

    In the last 3 days, the lowest price for a flight from Denver to San Francisco was $53 for a one-way ticket and $95 for a round-trip.

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

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airports will I be using when flying from Denver to San Francisco?

    Denver and San Francisco are both served by 1 main airport. You will leave Denver from Denver Intl and will be arriving at San Francisco.

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

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

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

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

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

    Star Alliance is the only airline alliance operating flights between Denver and San Francisco.

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

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

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

    The two airlines most popular with KAYAK users for flights from Denver to San Francisco are Southwest and United Airlines. With an average price for the route of $268 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $321 and an overall rating of 7.4.

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

    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 Denver to San Francisco.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Denver 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 Denver to San Francisco?

    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 San Francisco with an airline and back to Denver with another airline. Booking your flights between Denver and SFO 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 Denver to San Francisco?

    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 San Francisco from Denver 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 Denver to San Francisco

  • Looking for a cheap flight? 25% of our users found flights on this route for $131 or less one-way and $257 or less round-trip.
  • Do the children need to work off a bit of energy after their flight to San Francisco? Fortunately for travelers with children, there are three children’s play areas in San Francisco International Airport: two in Terminal 3 and one in Terminal 2.
  • Denver International Airport is conveniently linked to downtown Denver area by both public transport and local highways. The A Line commuter train is the best option for travelers relying on public transport as it offers quick access to downtown straight from the airport.
  • Driving a car to Denver International Airport? The airport’s parking is located onsite at the airport. Covered parking is located outside Jeppesen Terminal. The shuttle buses, every 10 minutes, are found at Jeppesen Terminal on Level 5’s Island 4.
  • It never hurts to stretch the legs or get a bit of a workout in before or after a flight. Luckily for travelers with flights from Denver to San Francisco, exercise is made easy, thanks to San Francisco International Airport’s yoga rooms. There are two yoga rooms in the airport, located in Terminals 2 and 3, and they are both open 24 hours a day.
  • Looking to take public transportation at San Francisco International Airport? BART (Bay Area Rapid Transport) offers quick and direct access from San Francisco International Airport to all across the city. Terminal 3 at San Francisco International Airport hosts the airport’s BART station and reaching the rest of the airport is as easy as hopping on the airport’s complimentary AirTrain.
  • You can wait for your Denver International Airport (DEN) to San Francisco International Airport (SFO) flight at any of the lounges at DEN. These include American Airlines Admirals Club on Level 2, concourse A, and a USO lounge on Level 4, Concourse A.
  • If you want advice on San Francisco destinations, Airport Travel Agency has a counter in the International Terminal, Upper Level of SFO. They also make arrangements for transport to your hotel of residence.
  • DEN is re-known for its public art collection and murals. These include the Spirit of Colorado Mural in Concourse B, the Breeze Dance Mural in Concourse C, and the Family Ties Mural in Concourse A.

Prefer to fly direct from Denver to San Francisco?

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

Direct departures

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

Direct returns

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

Reviews of the top 3 airlines serving from Denver to San Francisco

 
See real verified KAYAK customer reviews for airlines flying from Denver to San Francisco. 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 Denver to San Francisco? 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 4298 reviews
8.0Comfort
8.1Boarding
7.0Food
8.6Crew
7.5Entertainment
Airline reviews

The charges were ridiculous for an hour flight and the turbulence was very scary.

2.0 MediocreDarcey, Feb 2026
SAN - SJC
Read more Southwest reviews

The charges were ridiculous for an hour flight and the turbulence was very scary.

My flight from Denver to Minneapolis was excellent. My flight from Minneapolis to Denver was one of the worst I flights I have ever experienced. I had a window seat, the gentleman in the middle seat was morbidly obese and SW should have made him purchase two seats. His elbow dug into my arm most of the way even after I asked to please be careful. I was literally squashed between the him and the window with no wiggle room. The plane was full so it was not possible to ask for a different seat. I realize I should have complained to the flight attendant but I didn't feel anything could be done to rectify the situation. I fly SW often, I will continue to do so as this was my first negative experience.

Everything went smoothly and we even arrived a little bit early.

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

The flight crew was extremely rude and especially not helpful when our flight was delayed.

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.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

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

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.

Overall we had a good experience during our flight from San Francisco to Houston.

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Teeny tiny bathrooms, crew was not realistic about when we'd arrive.

Flight was late - I was downgraded from first class to coach

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

7 hours delayed due to operational issues on United’s end. Basically laziness.

The internet service I paid for didn’t work at all and the flight crew was not very friendly.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

Not clean and was told I would get a great seat and it was not great at all

Delayed. Text notifications were slow. Not much information o what was happening. Boarding was slow and confusing. Wasn’t even offered water other flight. Had to ask. No entertainment at all. Felt like.a Greyhound bus.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

Frontier is the Walmart of airlines. Frontier has removed adjustability and comfort from their seats to make the flight lighter and save gas. This makes it impossible to sleep on their flights. Their customer service is abysmal. Once, I bought a drink on the plane, and they swiped my credit card on the plane to pay for it. Then I got three weeks of daily notices from my bank telling me they tried to charge the wrong card number over and over again. I tried to call them, but they removed the ability to actually talk to someone that can resolve such a problem from their company to cut corners. The only way to talk to someone in person is to go to the check-in counter at the airport (40 minutes drive from my house). Eventually their system gave up on trying to charge the card, after 21 days of repeated tries. They don't pad their prices even a little to handle customer service issues like missed flights. They also have a blanket policy preventing helping you reschedule a missed flight if their system says you "cancelled" your own flight online. This is a major problem because their website is broken on mobile devices, the only web browser you have at the airport when their gate staff tell you that you have to reschedule your own missed flight online because they can't help you. I tried to reschedule my flight on my android device and instead, their website crashed and "cancelled" my missed flight. When I got to the counter, the agent argued with me for 5 minutes insisting that I intentionally cancelled my own flight (implying I had to buy another flight). She missed the point: the problem was that I could not buy another flight because their website is broken. I left to avoid more conflict with the "customer service" agent. I tried to redress my issue with their only other "customer service" chanel available: the contact form on their website. The response I got was more of the same: you cancelled your own flight, according to our website / computer records, therefore we won't help you. I was trying to explain the problem with their broken website that cost me hundreds of dollars by crashing / malfunctioning and resulting in a cancelled flight, but they only had deaf ears for this problem. Worst customer service I have ever experienced. I will never buy another Frontier flight again, because it is a risky, painful move that I will likely regret often.

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

What I expected, nickeled and dined and a frontier flight attendant loudly complained about her job and lack of communication as she headed to the gate on her cell phone. Not professional.

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

Other airlines flying from Denver to San Francisco

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