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$61+ Cheap flights from San Francisco to Denver (SFO - DEN)

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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — DEN
Jan 15 — Jan 221
Thu 1/15
Thu 1/22
1 adult, Economy
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Find cheap flights from San Francisco to Denver 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 San Francisco to Denver Intl are usually found in January or February, booked 53 days in advance, depart on a Friday or Tuesday and return on a Friday

Cheap flight deals from San Francisco to Denver

Cheapest flights from San Francisco to Denver
Explore the most affordable flight options available from San Francisco to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.

This Frontier deal was found by Cheapflights users on 12/16. 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 12/311:29 pmSFO - DEN
1 stop8h 10mFrontier
Wed 1/74:04 pmDEN - SFO
Nonstop2h 55mFrontier
Deal found 12/16$123
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 12/311:29 pmSFO - DEN
1 stop8h 10mFrontier
Thu 1/810:29 pmDEN - SFO
1 stop24h 56mFrontier
Deal found 12/16$140
This Frontier deal was found by Cheapflights users on 12/16. 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 12/311:29 pmSFO - DEN
1 stop8h 10mFrontier
Fri 1/96:10 amDEN - SFO
Nonstop2h 53mFrontier
Deal found 12/16$146
This Kiwi.com deal was found by Cheapflights users on 12/15. 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 12/308:12 pmSFO - DEN
1 stop11h 43mFrontier
Wed 1/710:29 pmDEN - SFO
1 stop12h 17mFrontier
Deal found 12/15$157
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 12/311:29 pmSFO - DEN
1 stop8h 10mFrontier
Sat 1/1010:29 pmDEN - SFO
1 stop12h 17mFrontier
Deal found 12/16$167
This Frontier deal was found by Cheapflights users on 12/16. 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 12/311:29 pmSFO - DEN
1 stop8h 10mFrontier
Tue 1/64:29 pmDEN - SFO
Nonstop2h 55mFrontier
Deal found 12/16$172
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 12/308:12 pmSFO - DEN
1 stop11h 43mFrontier
Mon 1/510:37 pmDEN - SFO
1 stop14h 17mFrontier
Deal found 12/16$175
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 12/311:29 pmSFO - DEN
1 stop8h 10mFrontier
Mon 1/510:37 pmDEN - SFO
1 stop14h 17mFrontier
Deal found 12/16$176

Find flight deals from San Francisco to Denver

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Denver (DEN). 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 December 16, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$92
(Kiwi.com)

One-way from

$61
(Frontier)

Popular in

December

Cheapest in

January

Average price

$285

Good round-trip deal

$226 or less

Good one-way deal

$140 or less
Provider with most accurate pricing for San Francisco-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Denver Intl flights.
Search Deals
From San Francisco to Denver Intl
Search Deals
One-way flight from San Francisco to Denver Intl
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($0 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from San Francisco to Denver Intl.
Search Deals
Price to beat on a one-way flight from San Francisco to Denver Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco to Denver 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 December 16, 2025.
Use the filters below to find and compare flights from San Francisco to Denver that are best for you.

Fly from

San Francisco

Fly to

Denver

Route

Depart

Return

Price

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Tue 1/20

7:00 am-11:58 pm

1 stop15h 58m

Denver Intl

Wed 1/28

12:34 pm-9:55 pm

2 stops10h 21m

$185

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Fri 2/6

7:00 am-4:13 pm

1 stop8h 13m

Denver Intl

Sun 2/8

7:00 am-2:00 pm

1 stop8h 00m

$197

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Wed 1/7

7:00 am-11:58 pm

1 stop15h 58m

Denver Intl

Sat 1/10

5:09 pm-11:03 pm

1 stop6h 54m

$197

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Tue 1/20

2:52 pm-11:58 pm

1 stop8h 06m

Denver Intl

Mon 1/26

7:39 pm-11:01 am

1 stop16h 22m

$199

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Tue 2/17

6:00 am-11:45 am

1 stop4h 45m

Denver Intl

Fri 2/20

6:12 pm-11:14 pm

1 stop6h 02m

$207

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Fri 1/9

8:20 am-6:41 pm

1 stop9h 21m

Denver Intl

Wed 1/14

12:34 pm-9:55 pm

2 stops10h 21m

$215

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Wed 2/18

11:30 am-11:59 pm

2 stops11h 29m

Denver Intl

Fri 2/20

6:45 pm-11:59 pm

1 stop6h 14m

$215

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Sat 1/17

2:30 pm-11:35 pm

1 stop8h 05m

Denver Intl

Tue 1/20

12:34 pm-8:47 am

2 stops21h 13m

$218

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Sat 1/10

6:20 am-2:00 pm

1 stop6h 40m

Denver Intl

Wed 1/14

1:10 pm-9:15 pm

2 stops9h 05m

$222

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Thu 2/26

2:39 pm-11:25 pm

1 stop7h 46m

Denver Intl

Mon 3/2

6:40 am-1:48 pm

1 stop8h 08m

$223

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 21 results
1
2
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Compare providers for flights from San Francisco to Denver

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 San Francisco to Denver in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars

*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 San Francisco-Denver flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on San Francisco-Denver flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from San Francisco-Denver flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Francisco-Denver 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 San Francisco-Denver 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 San Francisco to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from San Francisco 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 San Francisco to Denver

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

Use this chart to determine the optimal time to book a round-trip flight from San Francisco to Denver. Price data was last updated on December 12, 2025.

To ensure you get the cheapest price possible for a flight from San Francisco to Denver, you should look to book at least 53 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, February is the cheapest month in which you can book a flight from San Francisco to Denver (average of $28). Flying from San Francisco to Denver in June is currently the most expensive (average of $106). 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 SFO to DEN?

Find hourly flight availability from San Francisco to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 16, 2025.

One of the essential ways to save on airfare from San Francisco to Denver is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 32% on airfare.

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

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Denver. Price data was last updated on December 13, 2025.

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

The best insider tips for San Francisco to Denver flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your San Francisco to Denver trip
Airlines
Frontier

Frontier's UpFront Plus seats guarantee an empty middle seat for added comfort.


Early morning flights have a better chance of on-time departure and arrival.

Read more about FrontierBy Marisa Garcia
United Airlines

Basic Economy allows a personal item only; no carry-on bags unless you're a MileagePlus member.


Economy Plus offers extra legroom seats at the front of the economy cabin for MileagePlus members.

Read more about United AirlinesBy Harriet Baskas
Airports
SFO

Save time by using the SFO2Go program to order meals for pickup during busy times.

Read more about SFOBy Harriet Baskas
DEN

Take the A Line train from DEN to Union Station for a quick, 37-minute ride into downtown Denver.

Read more about DENBy Emily Zemler
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 Denver

Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated December 16, 2025.
Get a feel of what it's like to fly with Southwest, United Airlines, and American Airlines from San Francisco to Denver by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,250 reviews

Food

7.0

Overall

7.9

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
7.9
Good
4,250 reviews
Southwest
7.9
Good
4,250 reviews

Food

7.0

Overall

7.9

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,092 reviews
Southwest
7.9
Good
4,250 reviews

Food

7.0

Overall

7.9

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,049 reviews
Southwest
7.9
Good
4,250 reviews

Food

7.0

Overall

7.9

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Allegiant Air
7.2
Good
700 reviews
Southwest
7.9
Good
4,250 reviews

Food

7.0

Overall

7.9

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.8
Fair
3,082 reviews
Southwest
7.9
Good
4,250 reviews

Food

7.0

Overall

7.9

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Denver. 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 San Francisco to Denver?

    To fly from San Francisco to Denver, you need to book a flight from San Francisco (SFO) to Denver Intl (DEN). Nonstop flights to Denver Intl from San Francisco take 2h 32m on average. When it comes time to book airfare, you have a few options: there are 18 outbound flights from San Francisco to Denver Intl offered by 6 different airlines.

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

    The San Francisco to Denver Intl flight path was viewed by 282 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 San Francisco to Denver?

    For as low as $207, Alaska Airlines can have you in Denver from San Francisco in 4h 45m. The distance from San Francisco to Denver is about 964 mi. This flight may include one or multiple stops.

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

    Flying on Frontier is currently your cheapest option to Denver, with prices starting at $62. Additional round-trip tickets that might be worth considering are offered by Allegiant Air and Delta, with the lowest prices starting at $88 and $128, respectively. Frontier is 73% cheaper than the average price of flights available within the next 90 days to this destination.

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

    $34 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Allegiant Air and Alaska Airlines, with prices starting from $42 and $64, respectively.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from San Francisco to Denver on time: Asiana Airlines (87%), United Airlines (86%), Air New Zealand (85%).

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

    Looking at all options, your cheapest flight can be booked for $75. While the most popular route (San Francisco - Denver Intl) can be booked for $73 on average, our data indicates $1,086 when flying from San Francisco to Denver.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from San Francisco to Denver 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 San Francisco to Denver?

    Currently, February is the cheapest month in which you can book a flight from San Francisco to Denver (average of $28). Flying from San Francisco to Denver in June is currently the most expensive (average of $106). 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 Denver?

Book flights to Denver if you plan to visit one of these locations
Black Hawk
Thornton
Broomfield
Westminster
Winter Park
Golden
Greeley
Lone Tree
Lakewood
Cripple Creek
Silverthorne
Central City
Frisco
Wheat Ridge
Manitou Springs
Fort Morgan
Brighton
Longmont
Idaho Springs
Evergreen

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from San Francisco to Denver

Discover the top 6 airlines that operate flights from San Francisco to Denver. 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 December 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$68Average$188FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$88Average$100FlexibilityNo cancel feeOn-time88%
SouthwestCheapest$157Average$278FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$163Average$330FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$176Average$428FlexibilityNo cancel feeOn-time71%
DeltaCheapest$216Average$276FlexibilityNo cancel feeOn-timeN/A

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