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

View AU$121 flight on Sat, 25 Oct. 2025Opens in a new window

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

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

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
Sat, 8 Nov. - Sat, 15 Nov.
SEA
Seattle
DEN
Denver
AU$241 Return, found 20 hours ago
AU$241
Return
found 20 hours ago
Select Delta flight, departing Sat, 8 Nov. from Seattle to Denver, returning Sat, 15 Nov., priced at AU$241 found 20 hours ago
Delta
Sat, 11 Oct. - Mon, 20 Oct.
SEA
Seattle
DEN
Denver
AU$254 Return, found 4 days ago
AU$254
Return
found 4 days ago
Select Delta flight, departing Sat, 11 Oct. from Seattle to Denver, returning Mon, 20 Oct., priced at AU$254 found 4 days ago
Alaska Airlines
Sat, 11 Oct. - Mon, 20 Oct.
SEA
Seattle
DEN
Denver
AU$254 Return, found 4 days ago
AU$254
Return
found 4 days ago
Select Alaska Airlines flight, departing Sat, 11 Oct. from Seattle to Denver, returning Mon, 20 Oct., priced at AU$254 found 4 days ago
Alaska Airlines
Sat, 8 Nov. - Sat, 15 Nov.
SEA
Seattle
DEN
Denver
AU$256 Return, found 20 hours ago
AU$256
Return
found 20 hours ago
Select Alaska Airlines flight, departing Sat, 8 Nov. from Seattle to Denver, returning Sat, 15 Nov., priced at AU$256 found 20 hours ago
Alaska Airlines
Tue, 14 Oct. - Sat, 18 Oct.
SEA
Seattle
DEN
Denver
AU$257 Return, found 4 days ago
AU$257
Return
found 4 days ago
Select Alaska Airlines flight, departing Tue, 14 Oct. from Seattle to Denver, returning Sat, 18 Oct., priced at AU$257 found 4 days ago
Delta
Thu, 11 Dec. - Mon, 15 Dec.
SEA
Seattle
DEN
Denver
AU$268 Return, found 4 hours ago
AU$268
Return
found 4 hours ago
Select Delta flight, departing Thu, 11 Dec. from Seattle to Denver, returning Mon, 15 Dec., priced at AU$268 found 4 hours ago
Alaska Airlines
Thu, 11 Dec. - Mon, 15 Dec.
SEA
Seattle
DEN
Denver
AU$268 Return, found 4 hours ago
AU$268
Return
found 4 hours ago
Select Alaska Airlines flight, departing Thu, 11 Dec. from Seattle to Denver, returning Mon, 15 Dec., priced at AU$268 found 4 hours ago
Alaska Airlines
Sat, 8 Nov. - Sat, 15 Nov.
SEA
Seattle
DEN
Denver
AU$271 Return, found 20 hours ago
AU$271
Return
found 20 hours ago
Select Alaska Airlines flight, departing Sat, 8 Nov. from Seattle to Denver, returning Sat, 15 Nov., priced at AU$271 found 20 hours ago
American Airlines
Tue, 14 Oct. - Sat, 18 Oct.
SEA
Seattle
DEN
Denver
AU$302 Return, found 4 days ago
AU$302
Return
found 4 days ago
Select American Airlines flight, departing Tue, 14 Oct. from Seattle to Denver, returning Sat, 18 Oct., priced at AU$302 found 4 days ago
United
Sat, 11 Oct. - Mon, 20 Oct.
SEA
Seattle
DEN
Denver
AU$316 Return, found 4 days ago
AU$316
Return
found 4 days ago
Select United flight, departing Sat, 11 Oct. from Seattle to Denver, returning Mon, 20 Oct., priced at AU$316 found 4 days ago

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

January is typically the cheapest month to fly

From AU$100 - AU$364 per traveller.

Graph displaying average flight prices per month

Flight from Seattle to Denver route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Return price
AU$240
Distance
1635 km
Average flight time
3 hours 41 mins

Your quick guide to flights from Seattle to Denver

Pick up great flights from Seattle to Denver

With Expedia, you have your pick of 47 flights a day with 20 airlines covering flights from Seattle to Denver. 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 Seattle to Denver that take around 4 hours.

Find cheap flights from Seattle to Denver

From the great flight deals with prices currently ranging from AU$241 to AU$316, you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from Seattle to Denver 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 Denver is normally in November.

Reasons to book your flight from Seattle to Denver 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 Seattle to Denver 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 Denver 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 SEA to Denver Airport?
If you're travelling between SEA and Denver Intl. Airport (DEN), round-trip journeys start from AU$241. This price is based on fares available within the last 7 days on Expedia for flights departing within the next year, so don't let a good deal pass you by. Book now and save yourself money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Sea-Tac Airport to Denver Airport?
This can differ between air carriers, as each has its own terms and conditions. Visit the Customer Service Portal, where there are instructions on how to cancel online.
How do I find cheap flights from Sea-Tac Airport to Denver Intl. Airport (DEN) 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 Sea-Tac Airport to Denver Intl. Airport (DEN) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from SEA to DIA airport?
The flight distance from SeaTac to Denver is 1 650 kilometres. Bring along a snack, a drink and an interesting novel to read. Keep yourself entertained and the time will fly by.
Which airlines fly direct from SEA to Denver Intl. Airport (DEN)?
It's easy to fly directly from Sea-Tac Airport to Denver Airport. These are the top carriers that operate nonstop services on this route:

  • 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 SEA to DEN flight tickets cheaper when they're purchased at the last minute?
It is possible to get a great last-minute deal from SEA to Denver Intl. Airport (DEN), but there's no guarantee. As many airlines publish prices up to 12 months in advance, it's worthwhile keeping an eye on fares early and being ready to pounce when you see a bargain. Expedia compares air carrier prices and updates flight deals all the time, so you can be sure you're always getting the latest offers.

Explore a world of travel with Expedia

Seattle Airports

Seattle Paine Field Intl. Airport

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