$74 Cheap Frontier Airlines flights Seattle (SEA) to Denver (DEN)

Apply the “Price (lowest to highest)” filter on Expedia to find cheap Frontier Airlines round-trip flights from $148 from SEA to DEN. Affordable one-way tickets from $74 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.

January is one of the cheapest months to get away to Denver with Frontier Airlines. You could also find fantastic deals on one-way and round-trip fares in November.

To find cheap Frontier Airlines fares from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN), start searching one to three months before your planned departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also affect what you pay. Sunday tends to be the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your journey on a Sunday.**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.

Jet off on one of Frontier Airlines’s 4 direct weekly flights from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN). To see your options, enter your origin, destination and dates and hit search. Then use the “Nonstop” and “Airline” filters.

On average, it takes 2h 47m to fly nonstop from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN) with Frontier Airlines.

Setting off from SEA at 3:15PM UTC-8, the earliest Frontier Airlines flight to DEN lands at 7:02PM UTC-7. Flying earlier in the day means you’re less likely to encounter delays or cancellations.* Prefer to travel later? The last Frontier Airlines flight from SEA to DEN departs at 3:18PM UTC-8 and touches down at 7:05PM 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.

Board a Frontier Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to Denver, and you’ll most likely come in to Denver Intl. Airport (DEN). This is the airline’s primary hub here.

Journey from SEA to DEN with Frontier Airlines and you can look forward to a range of perks including a rewarding loyalty program. When booking through Expedia as a Frontier Miles and One Key™ member, you may also earn OneKeyCash™* to spend on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

You’ll likely be on an Airbus A320neo or an Airbus A321neo when flying Frontier Airlines from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN). However, keep in mind that a different plane could be assigned to your route depending on operational demands.

Depending on your ticket type, a fee typically applies if you cancel or reschedule your flight more than 24 hours after confirmation. To find flexible plane tickets, select our “Changes included” and “No cancel fee” boxes when looking for flights. To learn more about canceling or changing your reservation, visit “Trips,” select your flight and tick “Manage Booking.”