Set the “Price (lowest to highest)” filter on Expedia to find cheap Frontier Airlines return flights from $105 from SFO to DEN. Affordable one-way options from $69 are also on offer.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Search for return or one-way flights to Denver in January or November. You could find a cheap fare with Frontier Airlines during these quieter months.

Search for cheap Frontier Airlines flights from San Francisco Intl. Airport (SFO) to Denver Intl. Airport (DEN) one to three months ahead of your departure day. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare type and itinerary, the best day of the week to book a domestic flight is usually Sunday and the most expensive is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Frontier Airlines operates direct flights from San Francisco Intl. Airport (SFO) to Denver Intl. Airport (DEN), with 11 departures each week. Just choose the “Nonstop” and “Airline” filters during your search on Expedia to show all direct Frontier Airlines flights to DEN.

On average, it takes 2h 40m to fly nonstop from San Francisco Intl. Airport (SFO) to Denver Intl. Airport (DEN) with Frontier Airlines.

If it’s flexibility you’re after, Saturday offers the most choice for Frontier Airlines flights from San Francisco Intl. Airport (SFO) to Denver Intl. Airport (DEN). You can pick from 2 different departures.

Setting off from SFO at 6:05AM UTC-8, the earliest Frontier Airlines flight to DEN arrives at 9:51AM UTC-7. Traveling early means you’ll be less likely to encounter cancellations or delays.* After something later? The last Frontier Airlines flight from SFO to DEN departs at 9:10PM UTC-8 and touches down at 12:43AM UTC-7.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Frontier Airlines flights from San Francisco Intl. Airport (SFO) to Denver land at Denver Intl. Airport (DEN). This is the main gateway to this destination.

A rewarding loyalty program and the ability to rack up points through Frontier Miles are the start of the reasons to leave from SFO to DEN with Frontier Airlines. Plus, by joining Expedia’s free One Key™ program, you can earn OneKeyCash™* in addition to any airline loyalty program earnings. It’s yours to spend on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Frontier Airlines generally flies Airbus A321neo planes for flights from San Francisco Intl. Airport (SFO) to Denver Intl. Airport (DEN). This airline also operates the Airbus A320neo on this route. Remember that aircraft type can vary due to operational demands, so the plane you catch could be different on the day.

Typically, you can cancel or reschedule your flight, although additional charges may apply if you made your booking over 24 hours ago. Want to keep your options open? Apply the “No cancel fee” or “Changes included” filter to find flights that won’t charge you extra if you need to alter your plans. To update your booking, visit “Trips,” select your flight and click on “Manage Booking” for more information.