$72 Cheap Frontier Airlines flights Denver (DEN) to Seattle (SEA)

Finding cheap one-way Frontier Airlines flights from DEN to SEA from $72 on Expedia is simple — just filter by “Price (lowest to highest).” Or check out our budget-friendly round-trip fares from $144 for your next break.**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 fly to Seattle with Frontier Airlines. You could also find great prices on one-way and round-trip fares in February.

To find cheap Frontier Airlines fares from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA), start searching one to three months before your intended 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 impact the price you pay. Sunday is usually 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.

Frontier Airlines offers direct flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA), with 4 departures every week. Simply choose the “Nonstop” and “Airline” filters while searching on Expedia to see all direct Frontier Airlines flights to SEA.

On average, it takes 3h 5m to fly nonstop from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) with Frontier Airlines.

Jetting off from DEN at 12:20PM UTC-7, the earliest Frontier Airlines flight to SEA lands at 2:25PM UTC-8. Flying early means you’ll be less likely to experience delays.* Prefer a later start? The last Frontier Airlines flight from DEN to SEA departs at 1:40PM UTC-7 and touches down at 3:45PM UTC-8.*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 Denver Intl. Airport (DEN) to Seattle touch down at Seattle - Tacoma Intl. Airport (SEA). This is the main entry point to this destination.

Fly from DEN to SEA 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 can also earn OneKeyCash™* to use on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Most likely, you’ll board an Airbus A320neo for your Frontier Airlines flight from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA). However, you could be switched to another aircraft if there’s an operational need.

In most cases, you can cancel or reschedule your flight, although additional fees may apply if you made your booking over 24 hours ago. Need flexible options? Apply the “Changes included” or “No cancel fee” filter to find flights that won’t penalize you if you have to alter your plans. To make modifications, go to “Trips,” select your flight and click on “Manage Booking” for more details.