Cheap Alaska Airlines flights Denver (DEN) to Seattle (SEA)

Set the “Price (lowest to highest)” filter on Expedia to search for cheap Alaska Airlines return flights from DEN to SEA. Affordable one-way options are available as well.**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 Seattle in January or February. You could find a cheap fare with Alaska Airlines during these off-peak months.

Look for cheap Alaska Airlines flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) one to three months prior to your day of departure. 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. Regardless of fare type and itinerary, the best day to book a domestic flight is generally Sunday and the most expensive day 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.

Skip the layovers and fly from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) on one of Alaska Airlines’s 19 direct weekly flights. Use Expedia’s “Nonstop” and “Airline” filters to find the Alaska Airlines flight that’ll take you to SEA at a time that suits you.

It takes around 3h 14m to travel nonstop from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) with Alaska Airlines.

Alaska Airlines operates the most flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) on Sunday. With up to 3 daily departures, you’ll get the most flexibility and choice on this day.

Setting off from DEN at 7:00AM UTC-7, the first Alaska Airlines flight to SEA lands at 9:19AM UTC-8. Traveling early means you’re less likely to experience delays.* Not a morning person? The last Alaska Airlines flight from DEN to SEA departs at 4:45PM UTC-7 and touches down at 6:50PM 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.

Seattle - Tacoma Intl. Airport (SEA) is the main Seattle gateway for Alaska Airlines flights from Denver Intl. Airport (DEN).

Alaska Airlines makes flying from DEN to SEA more comfortable with top-tier customer service and an excellent in-flight experience. You may even earn points with Mileage Plan. Be sure to sign up to Expedia’s free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Alaska Airlines generally flies Boeing 737 MAX 9 planes for flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA). This carrier also operates the Boeing 737-900 on this route. Keep in mind that aircraft type can vary due to operational needs, so the plane you catch could be different on your travel date.

Changes are generally free within 24 hours of making your booking, but your airline may charge you after that. For further details about modifying your flights, go to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to update your itinerary without extra charges, apply the “Changes included” and “No cancel fee” filters when organizing your next break.