Cheap Flights from Denver (DEN) to Seattle (SEA)

View AU$121 flight on Wed, 8 Oct. 2025Opens in a new window

Popular airlines from Denver International Airport (DEN) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Denver (DEN) to Seattle (SEA)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Mon, 22 Sep. - Fri, 26 Sep.
DEN
Denver
SEA
Seattle
AU$267 Return, found 5 days ago
AU$267
Return
found 5 days ago
Select Delta flight, departing Mon, 22 Sep. from Denver to Seattle, returning Fri, 26 Sep., priced at AU$267 found 5 days ago
Alaska Airlines
Mon, 22 Sep. - Fri, 26 Sep.
DEN
Denver
SEA
Seattle
AU$281 Return, found 5 days ago
AU$281
Return
found 5 days ago
Select Alaska Airlines flight, departing Mon, 22 Sep. from Denver to Seattle, returning Fri, 26 Sep., priced at AU$281 found 5 days ago
Delta
Mon, 22 Sep. - Fri, 26 Sep.
DEN
Denver
SEA
Seattle
AU$282 Return, found 5 days ago
AU$282
Return
found 5 days ago
Select Delta flight, departing Mon, 22 Sep. from Denver to Seattle, returning Fri, 26 Sep., priced at AU$282 found 5 days ago
Delta
Sat, 13 Sep. - Mon, 15 Sep.
DEN
Denver
SEA
Seattle
AU$297 Return, found 5 days ago
AU$297
Return
found 5 days ago
Select Delta flight, departing Sat, 13 Sep. from Denver to Seattle, returning Mon, 15 Sep., priced at AU$297 found 5 days ago
Alaska Airlines
Sat, 13 Sep. - Mon, 15 Sep.
DEN
Denver
SEA
Seattle
AU$312 Return, found 5 days ago
AU$312
Return
found 5 days ago
Select Alaska Airlines flight, departing Sat, 13 Sep. from Denver to Seattle, returning Mon, 15 Sep., priced at AU$312 found 5 days ago
Alaska Airlines
Mon, 22 Sep. - Fri, 26 Sep.
DEN
Denver
SEA
Seattle
AU$328 Return, found 5 days ago
AU$328
Return
found 5 days ago
Select Alaska Airlines flight, departing Mon, 22 Sep. from Denver to Seattle, returning Fri, 26 Sep., priced at AU$328 found 5 days ago
Delta
Mon, 6 Jul. - Sat, 11 Jul.
DEN
Denver
SEA
Seattle
AU$333 Return, found 5 days ago
AU$333
Return
found 5 days ago
Select Delta flight, departing Mon, 6 Jul. from Denver to Seattle, returning Sat, 11 Jul., priced at AU$333 found 5 days ago
United
Mon, 22 Sep. - Fri, 26 Sep.
DEN
Denver
SEA
Seattle
AU$343 Return, found 5 days ago
AU$343
Return
found 5 days ago
Select United flight, departing Mon, 22 Sep. from Denver to Seattle, returning Fri, 26 Sep., priced at AU$343 found 5 days ago
Alaska Airlines
Mon, 22 Sep. - Fri, 26 Sep.
DEN
Denver
SEA
Seattle
AU$351 Return, found 5 days ago
AU$351
Return
found 5 days ago
Select Alaska Airlines flight, departing Mon, 22 Sep. from Denver to Seattle, returning Fri, 26 Sep., priced at AU$351 found 5 days ago
Alaska Airlines
Sat, 13 Sep. - Mon, 15 Sep.
DEN
Denver
SEA
Seattle
AU$358 Return, found 5 days ago
AU$358
Return
found 5 days ago
Select Alaska Airlines flight, departing Sat, 13 Sep. from Denver to Seattle, returning Mon, 15 Sep., priced at AU$358 found 5 days ago

Find the cheapest month to fly from Denver (DEN) to Seattle (SEA)

January is typically the cheapest month to fly

From AU$101 - AU$381 per traveller.

Graph displaying average flight prices per month

Flight from Denver to Seattle route information
Origin airport
Denver Intl.
Destination airport
Seattle - Tacoma Intl.
Return price
AU$266
Distance
1635 km
Average flight time
1 hour 55 mins

Your quick guide to flights from Denver to Seattle

Pick up great flights from Denver to Seattle

With Expedia, you have your pick of 56 flights a day with 20 airlines covering flights from Denver to Seattle. Whether you’re on a business trip, a family holiday or a luxury break, just enter your travel dates, hit search then check out your choice of flights. Select from return, one way or multi-city flights, and use the advance search tool if you want a direct or refundable flight. You can narrow your search to show you just your preferred cabin class and airline, too. It’s all easy. You can book direct flights from Denver to Seattle that take around 2 hours.

Find cheap flights from Denver to Seattle

From the great flight deals with prices currently ranging from AU$267 to AU$358, you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from Denver to Seattle around 4 to 6 weeks in advance. If your travel dates are flexible, try to avoid weekends and peak seasons – when you are more likely to grab the lowest prices. Even last minute, there are some impressive deals. The cheapest time to fly to Seattle is normally in September.

Reasons to book your flight from Denver to Seattle with Expedia

Expedia makes it easy to find, book, and travel, with everything you need all in one place. When you enter your travel details, find fantastic deals just for you on flight tickets from Denver to Seattle across all the main airline carriers, so you can save time, dollars, and hassle finding the perfect flight. If you think your plans could change, choose refundable flights so any changes won’t cost you more. Book your flight to Seattle right now and, if you join Expedia Rewards, you earn points this time and every time you travel with Expedia.

Frequently asked questions

How much is a flight from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
The lowest price advertised for a round-trip flight from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) is AU$267. But you better act quick. This price is taken from fares offered within the last 7 days on Expedia for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Denver Intl. Airport (DEN) to SEA?
Every airline has a different set of terms and conditions. If you decide to cancel your trip, visit our Customer Service Portal.
How do I find cheap flights from Denver Airport to Seattle - Tacoma Intl. Airport (SEA) that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from DEN to SEA?
Around 1 650 kilometres separates Denver and SeaTac, so pack some entertainment to keep you busy for a couple of hours. That latest bestseller you're eager to read will be perfect.
Which airlines fly direct from Denver Airport to Seattle - Tacoma Intl. Airport (SEA)?
Travelling from DIA airport to Sea-Tac Airport is easy when you have a nice range of airlines to choose from. Here are some of the best:

  • United Airlines - (UA) with 147 monthly flights
  • Southwest Airlines - (WN) with 130 monthly flights
  • Alaska Airlines - (AS) with 117 monthly flights
  • Delta Air Lines - (DL) with 91 monthly flights

Are Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) flight tickets cheaper when they're purchased at the last minute?
Flight prices fluctuate, so it's no sure thing. While last-minute flight deals between DIA airport and Seattle - Tacoma Intl. Airport (SEA) are of course possible, it also makes sense to keep an eye on prices well before you fly. In fact, some airlines release their prices up to a year prior to the departure date. Expedia is constantly updating the best bargains around, so check back often and be ready to grab your seat when the fares dip.

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