HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Francisco

$73+ Cheap flights from Denver to San Francisco (DEN - SFO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SFO
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Denver to San Francisco with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Denver Intl to San Francisco are usually found in February or January, booked 81 days in advance, depart on a Thursday or Friday and return on a Friday

Find flight deals from Denver to San Francisco

Cheapest flights from Denver to San Francisco
Explore the most affordable flight options available from Denver to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 6, 2025.

This Mytrip deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2610:29 pmDEN - SFO
1 stop26h 00mFrontier
Tue 12/26:18 amSFO - DEN
Nonstop2h 42mFrontier
Deal found 11/6$130
This Kiwi.com deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2610:29 pmDEN - SFO
Nonstop2h 55mFrontier
Fri 11/286:32 amSFO - DEN
Nonstop2h 42mFrontier
Deal found 11/5$132
This CheapOair deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/156:00 amDEN - SFO
Nonstop2h 53mFrontier
Tue 12/306:24 amSFO - DEN
Nonstop2h 42mFrontier
Deal found 11/6$133
This Frontier deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/46:00 amDEN - SFO
Nonstop2h 53mFrontier
Wed 12/176:30 amSFO - DEN
Nonstop2h 42mFrontier
Deal found 11/6$134
This Mytrip deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2610:29 pmDEN - SFO
1 stop26h 00mFrontier
Wed 12/36:00 amSFO - DEN
1 stop15h 29mFrontier
Deal found 11/5$136
This Cheapflightsfares deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:59 amDEN - SFO
1 stop13h 19mFrontier
Fri 12/56:30 amSFO - DEN
Nonstop2h 42mFrontier
Deal found 11/6$137
This Frontier deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/210:29 pmDEN - SFO
Nonstop2h 55mFrontier
Fri 12/128:48 amSFO - DEN
Nonstop2h 42mFrontier
Deal found 11/6$138
This Frontier deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/39:15 pmDEN - SFO
Nonstop2h 52mFrontier
Sun 12/78:22 pmSFO - DEN
1 stop11h 33mFrontier
Deal found 11/5$139
This Kiwi.com deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/29:33 amDEN - SFO
1 stop8h 18mFrontier
Wed 12/36:18 amSFO - DEN
Nonstop2h 42mFrontier
Deal found 11/5$140
This Cheapflightsfares deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2210:29 pmDEN - SFO
1 stop9h 42mFrontier
Fri 11/286:00 amSFO - DEN
1 stop20h 58mFrontier
Deal found 11/6$141
This Kiwi.com deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/29:33 amDEN - SFO
1 stop8h 18mFrontier
Tue 12/166:30 amSFO - DEN
Nonstop2h 42mFrontier
Deal found 11/6$142

Cheap flight deals from Denver to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to San Francisco (SFO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 6, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$130
(Mytrip)

One-way from

$73
(CheapOair)

Popular in

July

Cheapest in

February

Average price

$247

Good round-trip deal

$230 or less

Good one-way deal

$118 or less
Provider with most accurate pricing for Denver Intl-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-San Francisco flights.
Search Deals
From Denver Intl to San Francisco
Search Deals
One-way flight from Denver Intl to San Francisco
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($35 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from Denver Intl to San Francisco.
Search Deals
Price to beat on a one-way flight from Denver Intl to San Francisco.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Denver to San Francisco that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 6, 2025.
Use the filters below to find and compare flights from Denver to San Francisco that are best for you.

Fly from

Denver

Fly to

San Francisco

Route

Depart

Return

Price

DenverSan Francisco

DEN - SFO

DENSFO

Denver Intl

Thu 12/25

6:30 am-8:23 am

Nonstop2h 53m

San Francisco

Thu 12/25

4:07 pm-7:48 pm

Nonstop2h 41m

$137

DenverSan Francisco

DEN - SFO

DENSFO

Denver Intl

Fri 1/23

11:55 am-4:04 pm

1 stop5h 09m

San Francisco

Sun 1/25

8:43 am-3:58 am

1 stop18h 15m

$138

DenverSan Francisco

DEN - SFO

DENSFO

Denver Intl

Tue 3/10

6:00 am-7:53 am

Nonstop2h 53m

San Francisco

Wed 3/11

4:59 pm-3:58 am

1 stop9h 59m

$149

DenverSan Francisco

DEN - SFO

DENSFO

Denver Intl

Fri 11/21

6:05 am-8:08 am

Nonstop3h 03m

San Francisco

Mon 11/24

6:32 am-10:14 am

Nonstop2h 42m

$161

DenverSan Francisco

DEN - SFO

DENSFO

Denver Intl

Tue 12/2

6:59 pm-8:06 am

1 stop14h 07m

San Francisco

Wed 12/17

7:00 am-11:59 pm

1 stop15h 59m

$183

DenverSan Francisco

DEN - SFO

DENSFO

Denver Intl

Thu 12/11

6:00 am-2:03 pm

1 stop9h 03m

San Francisco

Fri 12/12

7:00 am-11:59 pm

1 stop15h 59m

$189

DenverSan Francisco

DEN - SFO

DENSFO

Denver Intl

Thu 12/18

6:00 am-3:53 pm

2 stops10h 53m

San Francisco

Sun 1/18

7:00 am-6:41 pm

1 stop10h 41m

$191

DenverSan Francisco

DEN - SFO

DENSFO

Denver Intl

Thu 2/12

7:55 am-9:55 am

Nonstop3h 00m

San Francisco

Sat 2/14

9:20 am-10:30 pm

2 stops12h 10m

$192

DenverSan Francisco

DEN - SFO

DENSFO

Denver Intl

Fri 12/12

7:46 am-9:37 am

Nonstop2h 51m

San Francisco

Mon 12/15

8:55 pm-12:30 am

Nonstop2h 35m

$197

DenverSan Francisco

DEN - SFO

DENSFO

Denver Intl

Wed 12/3

6:59 pm-8:06 am

1 stop14h 07m

San Francisco

Thu 12/18

8:00 am-5:52 pm

1 stop8h 52m

$203

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 24 results
1
2
3

Compare providers for flights from Denver to San Francisco

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Denver to San Francisco in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Denver-San Francisco flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Denver-San Francisco flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Denver-San Francisco flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Denver-San Francisco flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Denver-San Francisco flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Denver to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Denver with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a round-trip flight from Denver to San Francisco. Price data was last updated on October 31, 2025.

The best time to book flights from Denver to San Francisco is 81 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Denver to San Francisco?

Currently, March is the cheapest month in which you can book a flight from Denver to San Francisco (average of $38). Flying from Denver to San Francisco in August is currently the most expensive (average of $124). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from DEN to SFO?

Find hourly flight availability from Denver to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 6, 2025.

It’s optimal to fly from Denver to San Francisco at noon. By choosing this option you can save up to 29% on the cost of your flight, compared to a flight in the afternoon.

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

Use this chart to determine the cheapest time to fly round-trip from Denver to San Francisco. Price data was last updated on November 2, 2025.

Travelers seeking maximum savings on their Denver to San Francisco flight should consider departing on Monday at noon when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Denver to San Francisco flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Denver to San Francisco trip
Airlines
Frontier

Frontier's UpFront Plus offers a guaranteed empty middle seat for added comfort.


Frontier's Zone 1 boarding is available with a carry-on purchase or special fare bundle.

Read more about Frontierby Marisa Garcia
United Airlines

United's Economy Plus offers extra legroom seats towards the front of the economy cabin.


United's Polaris Lounges offer showers, napping areas, and dining for premium passengers.

Read more about United Airlinesby Harriet Baskas
Airports
DEN

Use the A Line train for a quick 37-minute ride from downtown Denver to DEN, avoiding traffic and parking hassles.

Read more about DENby Emily Zemler
SFO

Take BART from SFO to downtown San Francisco in about 40 minutes for an affordable and efficient transit option.

Read more about SFOby Harriet Baskas
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines and SFO

Harriet Baskas

Harriet Baskas

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.

Read more
Emily Zemler

Emily Zemler

Expert on DEN

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Francisco. Reviews last updated November 6, 2025.
See what other customers who have flown with Southwest, United Airlines, and Frontier from Denver to San Francisco have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,240 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,240 reviews
Southwest
8.0
Very good
4,240 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
9,003 reviews
Southwest
8.0
Very good
4,240 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,116 reviews
Southwest
8.0
Very good
4,240 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Denver to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Denver to San Francisco?

    If you book a flight from Denver to San Francisco, you will be flying from Denver Intl to San Francisco. Flights to San Francisco (SFO) from Denver Intl (DEN) take 2h 48m for a nonstop flight. There are 40 flights from Denver Intl to San Francisco per day from 3 airlines.

  • How popular is this Denver to San Francisco flight route?

    The Denver Intl to San Francisco flight path was viewed by 119 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Denver to San Francisco?

    Frontier and Alaska Airlines can get you from Denver to San Francisco in just under 2h 53m. Your travel time can differ by up to 11h 14m. The distance from Denver to San Francisco is about 964 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Denver to San Francisco round-trip?

    Currently priced at $63, Frontier will fly you from Denver to San Francisco and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Southwest and United Airlines - these airlines can fly you to your destination from $144 and $170, respectively. Users have found that Frontier is 72% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Denver to San Francisco one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $77. However, be on the lookout for offers from United Airlines and Southwest, as they are both options that can get you from Denver to San Francisco for a low price.

  • What are the most reliable airlines from Denver to San Francisco?

    The top 3 most reliable airlines when flying from Denver to San Francisco are Air China (89%), Emirates (85%) and United Airlines (80%).

  • What are the cheapest flights from Denver to San Francisco?

    Looking for the cheapest flight from Denver to San Francisco? While on average our users pay $915, our data indicates the cheapest price to be $55. The most popular route (Denver Intl - San Francisco), is priced around $88.

  • Can I find deals for flights from Denver to San Francisco that include hotel bookings?

    Yes. In addition to deals on Denver to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Denver to San Francisco?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to San Francisco.

  • Can I find deals for business class flights from Denver to San Francisco?

    Yes. Cheapflights offers flight deals from Denver to San Francisco by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, March is the cheapest month in which you can book a flight from Denver to San Francisco (average of $38). Flying from Denver to San Francisco in August is currently the most expensive (average of $124). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
South San Francisco
Santa Cruz
Livermore
Turlock
Manteca
Watsonville
Sunnyvale
Santa Clara
Vallejo
Hollister
San Bruno
Foster City
Redwood City
Union City
Burlingame
Lodi
San Mateo
Vacaville
Lathrop

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Denver to San Francisco

See prices for flight routes from nearby airports that may be better suited for you.
Denver to Las Vegas flights
Denver to Los Angeles flights
Denver to Ontario flights
Denver to San Diego flights
Denver to Santa Ana flights
Denver to Palm Springs flights
Denver to Burbank flights
Denver to San Jose flights
Denver to Sacramento flights
Colorado Springs to Las Vegas flights
Denver to Reno flights
Denver to Santa Barbara flights
Denver to Fresno flights
Denver to Monterey flights
Aspen to Los Angeles flights
Colorado Springs to Los Angeles flights
Denver to Medford flights
Grand Junction to Las Vegas flights
Grand Junction to San Diego flights
Colorado Springs to Ontario flights
Denver to San Luis Obispo flights
Denver to Long Beach flights
Denver to Oakland flights
Denver to Bakersfield flights
Colorado Springs to San Diego flights
Vail to Las Vegas flights
Grand Junction to Los Angeles flights
Durango to Las Vegas flights
Colorado Springs to San Francisco flights
Denver to Arcata flights
Montrose to Los Angeles flights
Vail to Santa Ana flights
Aspen to San Francisco flights
Durango to San Francisco flights
Colorado Springs to Santa Ana flights
Grand Junction to Ontario flights
Grand Junction to San Francisco flights
Durango to Los Angeles flights
Colorado Springs to Burbank flights
Montrose to Las Vegas flights
Denver to Santa Rosa flights
Colorado Springs to Long Beach flights
Grand Junction to Santa Ana flights
Vail to Los Angeles flights
Vail to San Diego flights
Colorado Springs to Palm Springs flights
Aspen to Palm Springs flights
Denver to Redding flights
Aspen to Las Vegas flights

Top 3 airlines flying from Denver to San Francisco

Discover the top 3 airlines that operate flights from Denver to San Francisco. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$63Average$174FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$144Average$258FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$170Average$323FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.