Cheap Flights from San Francisco International to Denver International

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Compare San Francisco International to Denver International flight deals

Find the cheapest month or even day of the year to fly to Denver International

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Flight deals from San Francisco International to Denver International

Looking for a cheap last-minute deal or the best return flight from San Francisco International Airport to Denver International Airport? If you want to travel next month, return fares start from $172. Find the lowest prices on one-way and return tickets right here.

Denver.$172 per passenger.Departing Mon, 14 Sep, returning Thu, 17 Sep.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Mon, 14 Sep, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Thu, 17 Sep, arriving in San Francisco International.Price includes taxes and charges.From $172, select.

Denver.$185 per passenger.Departing Wed, 30 Sep, returning Wed, 7 Oct.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Wed, 30 Sep, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Wed, 7 Oct, arriving in San Francisco International.Price includes taxes and charges.From $185, select.

Denver.$190 per passenger.Departing Thu, 29 Oct, returning Wed, 4 Nov.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Thu, 29 Oct, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Wed, 4 Nov, arriving in San Francisco International.Price includes taxes and charges.From $190, select.

Denver.$191 per passenger.Departing Tue, 3 Nov, returning Tue, 10 Nov.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Tue, 3 Nov, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Tue, 10 Nov, arriving in San Francisco International.Price includes taxes and charges.From $191, select.

Denver.$191 per passenger.Departing Wed, 14 Oct, returning Sat, 24 Oct.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Wed, 14 Oct, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sat, 24 Oct, arriving in San Francisco International.Price includes taxes and charges.From $191, select.

Denver.$216 per passenger.Departing Wed, 2 Dec, returning Wed, 9 Dec.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Wed, 2 Dec, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Wed, 9 Dec, arriving in San Francisco International.Price includes taxes and charges.From $216, select.

Denver.$290 per passenger.Departing Mon, 31 Aug, returning Wed, 30 Sep.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Mon, 31 Aug, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Wed, 30 Sep, arriving in San Francisco International.Price includes taxes and charges.From $290, select.

Denver.$311 per passenger.Departing Fri, 13 Nov, returning Fri, 4 Dec.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Francisco International on Fri, 13 Nov, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Fri, 4 Dec, arriving in San Francisco International.Price includes taxes and charges.From $311, select.

Denver.$362 per passenger.Departing Thu, 24 Dec, returning Wed, 6 Jan.Return flight with United.Outbound direct flight with United departs from San Francisco International on Thu, 24 Dec, arriving in Denver International.Inbound direct flight with United departs from Denver International on Wed, 6 Jan, arriving in San Francisco International.Price includes taxes and charges.From $362, select.

Denver.$363 per passenger.Departing Wed, 10 Feb, returning Sat, 20 Feb.Return flight with United.Outbound direct flight with United departs from San Francisco International on Wed, 10 Feb, arriving in Denver International.Inbound direct flight with United departs from Denver International on Sat, 20 Feb, arriving in San Francisco International.Price includes taxes and charges.From $363, select.

Denver.$363 per passenger.Departing Sat, 9 Jan, returning Tue, 12 Jan.Return flight with United.Outbound direct flight with United departs from San Francisco International on Sat, 9 Jan, arriving in Denver International.Inbound direct flight with United departs from Denver International on Tue, 12 Jan, arriving in San Francisco International.Price includes taxes and charges.From $363, select.

Denver.$365 per passenger.Departing Wed, 27 Jan, returning Wed, 3 Feb.Return flight with United.Outbound direct flight with United departs from San Francisco International on Wed, 27 Jan, arriving in Denver International.Inbound direct flight with United departs from Denver International on Wed, 3 Feb, arriving in San Francisco International.Price includes taxes and charges.From $365, select.

Denver.$366 per passenger.Departing Thu, 26 Nov, returning Thu, 3 Dec.Return flight with United.Outbound direct flight with United departs from San Francisco International on Thu, 26 Nov, arriving in Denver International.Inbound direct flight with United departs from Denver International on Thu, 3 Dec, arriving in San Francisco International.Price includes taxes and charges.From $366, select.

Denver.$395 per passenger.Departing Fri, 26 Feb, returning Mon, 1 Mar.Return flight with United.Outbound direct flight with United departs from San Francisco International on Fri, 26 Feb, arriving in Denver International.Inbound direct flight with United departs from Denver International on Mon, 1 Mar, arriving in San Francisco International.Price includes taxes and charges.From $395, select.

Denver.$408 per passenger.Departing Wed, 26 Aug, returning Thu, 8 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Francisco International on Wed, 26 Aug, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Thu, 8 Oct, arriving in San Francisco International.Price includes taxes and charges.From $408, select.

Denver.$490 per passenger.Departing Tue, 22 Dec, returning Thu, 4 Feb.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Francisco International on Tue, 22 Dec, arriving in Denver International.Inbound direct flight with Southwest Airlines departs from Denver International on Thu, 4 Feb, arriving in San Francisco International.Price includes taxes and charges.From $490, select.

Find the cheapest month to fly from San Francisco International to Denver International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Francisco International to Denver International flights are currently cheapest in September.

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Direct flights from San Francisco International to Denver International

San Francisco International to Denver International: Alternative routes

Compare routes from San Francisco International to Denver below. You may find an airport to fly into that's cheaper, faster, or easier than Denver International.

Denver International

30km from central Denver

ClosestCheapest

from $172

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San Francisco to Denver: Flight information

The things to know before you go.

Cheapest flight found	$172
Cheapest month to fly	September
Average flight time	2 hrs, 42 mins
Most popular airline	United
Average flights per week	404

Finding cheap flights from San Francisco International to Denver International: Frequently asked questions

How much are return flights from San Francisco International to Denver International?

The best price we found for a return flight from San Francisco International to Denver International is $172. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from San Francisco International to Denver International?

2 hours and 42 minutes is the average flight time from San Francisco International to Denver International.

Which airlines fly direct from San Francisco International to Denver International?

United, Southwest Airlines and Air Canada fly direct from San Francisco International to Denver International.

How many flights are there a week from San Francisco International to Denver International?

As of August 2026, there are 404 flights per week flying from San Francisco International to Denver International.

When is the cheapest time to fly from San Francisco International to Denver International?

The cheapest month to fly from San Francisco International to Denver International is usually September.

Which upcoming date is cheapest to fly from San Francisco International Airport to Denver International Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Francisco International Airport to Denver International Airport on Monday, 14 September 2026.

Can I get a direct flight from San Francisco International Airport to Denver International Airport?

Yes – the average flight time is 2 hours and 42 minutes.

How can I find the best flight deal to Denver International?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Denver International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Denver?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Denver is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from San Francisco International Airport to Denver International with?

Currently, Frontier Airlines offers the cheapest flight tickets to Denver International.

Flying from San Francisco International Airport (SFO) to Denver International Airport (DEN): what you need to know

Around 2 hours 45 minutes is how long you can expect to be travelling on a direct flight from San Francisco International Airport to Denver International Airport.
Denver's timezone is UTC-7, making Denver one hour ahead of San Francisco.
Flights from SFO to DEN start at 05:00 — the earliest with United Airlines. The latest departure is at 21:25 with Southwest Airlines. Overall, there are 85 weekly San Francisco International Airport to Denver International Airport flights.
For a stress-free journey, turn up at the airport two hours ahead of international flights and one hour before domestic departures. This way, you can comfortably catch your SFO to DEN flight.
You can expect longer lines during popular months such as July. Arriving up to four hours ahead of international flights and two hours for domestic departures will help ensure a smooth travel experience.
You can travel nonstop to Denver, the United States. Book a ticket with one of these airlines that operate direct flights from San Francisco International Airport to Denver International Airport:
The airline that tops the list for bookings on this route is United.
United is the most punctual carrier offering SFO to DEN flights. A dependable 85.05% of its services on this route arrive on time.
If you want to add a stop to your trip, just uncheck 'Direct flights only' when searching for your ticket from San Francisco International Airport to Denver International Airport. Here are the top stopovers between SFO and DEN:
- Harry Reid International Airport
- Salt Lake City Airport
- Sacramento International Airport

How to find the cheapest flights from San Francisco International Airport (SFO) to Denver International Airport (DEN)

$82 is the lowest price for a one-way San Francisco International Airport to Denver International Airport flight. Return flights start at $172. These prices may change based on demand.
To find cheap tickets from SFO to DEN, book ahead. Airlines typically offer lower prices when flights are first made available.
May is the cheapest month for flights from San Francisco International Airport to Denver International Airport. If you're looking to travel at a different time of year, the 'Whole month' tool will show you the lowest prices for each month.
Cut down on the time spent looking for cheap flights from SFO to DEN by setting up a Price Alert. You'll receive an email or notification through the app when a special offer becomes available.
Lock in the ideal flight for you by using the filters. To see the 'Best,' 'Fastest' or 'Cheapest' flights from San Francisco International Airport to Denver International Airport, use the 'Sort by' function. You can also filter results by airline, arrival and departure times, and number of stops.

Handy information about San Francisco International Airport (SFO)

Of the flights that depart from San Francisco International Airport, 78% touch down on time at their destination.
Central San Francisco to San Francisco International Airport is approximately 21 kilometres. Depending on traffic, it'll take you about 25 minutes to get there if you're driving, ride-sharing or catching a taxi.
You can expect a trip time of about 35 minutes on public transport.
Get your travels off to a stress-free start by staying near SFO. Whether you've booked an early flight from San Francisco International Airport to Denver International Airport or just don't want to be rushed, these hotels are ideal:

Arriving at Denver International Airport (DEN)

Once your San Francisco International Airport to Denver International Airport flight has touched down, relax and unwind at a hotel close by. Baymont by Wyndham Denver International Airport is a comfortable option that's not too far from DEN.
Grab a Denver International Airport rental car and explore Denver and beyond with your own set of wheels. Routes Car Rentals, Dollar and Budget are top outlets you can book with here.
To lock in the lowest price, reserve your vehicle from Denver International Airport around one week in advance.

When to fly to Denver International Airport (DEN)

It's time to pick your travel dates for your flight from San Francisco International Airport to Denver International Airport. July is the most popular month to visit Denver. If you'd like a quieter vibe, go in January.
The warmest month in Denver is July, with the temperature ranging between 14ºC and 32ºC. Lock in your flights from San Francisco International Airport to Denver International Airport in this month if this is the type of weather you enjoy.
January sees average temperatures of between -9ºC and 7ºC. Search for cheap tickets from SFO to DEN sometime then if you want to travel when it's cooler.

Explore more of the United States

You've seen Denver, now it's time to discover other parts of the United States. Journey around 105 kilometres south to Colorado Springs to tick off its top sights. From Garden of the Gods to Pikes Peak Region Attractions and Red Rock Canyon, there's plenty to keep you on the go.
If you're ready to explore another major stop in the United States, head for Aurora, about 13 kilometres east of Denver. Plains Conservation Centre, DeLaney Homestead Historic District and Aircraft viewing are key highlights.