$50 Cheap Flights from Seattle (SEA) to Denver (DEN)

View $50 flight on Tue, May 6, 2025Opens in a new window

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

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Find available prices by choosing your travel dates.

Cheap Flights from Seattle to Denver (SEA-DEN)

Prices were available within the past 7 days and start at $50 for one-way flights and $100 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, May 6 - Sat, May 10
SEA
Seattle
DEN
Denver
$100 Roundtrip, just found
$100
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, May 6 from Seattle to Denver, returning Sat, May 10, priced at $100 just found
Frontier Airlines
Thu, May 8 - Sat, May 10
SEA
Seattle
DEN
Denver
$143 Roundtrip, just found
$143
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, May 8 from Seattle to Denver, returning Sat, May 10, priced at $143 just found
Frontier Airlines
Wed, Jun 11 - Sat, Jun 14
SEA
Seattle
DEN
Denver
$144 Roundtrip, just found
$144
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Jun 11 from Seattle to Denver, returning Sat, Jun 14, priced at $144 just found
Frontier Airlines
Wed, Jun 11 - Sat, Jun 21
SEA
Seattle
DEN
Denver
$147 Roundtrip, found 3 hours ago
$147
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Wed, Jun 11 from Seattle to Denver, returning Sat, Jun 21, priced at $147 found 3 hours ago
Frontier Airlines
Sat, Jul 19 - Sat, Jul 26
SEA
Seattle
DEN
Denver
$148 Roundtrip, just found
$148
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Jul 19 from Seattle to Denver, returning Sat, Jul 26, priced at $148 just found
United
Wed, May 14 - Sat, May 17
SEA
Seattle
DEN
Denver
$154 Roundtrip, found 4 hours ago
$154
Roundtrip
found 4 hours ago
Select United flight, departing Wed, May 14 from Seattle to Denver, returning Sat, May 17, priced at $154 found 4 hours ago
Frontier Airlines
Wed, May 7 - Wed, May 14
SEA
Seattle
DEN
Denver
$158 Roundtrip, just found
$158
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, May 7 from Seattle to Denver, returning Wed, May 14, priced at $158 just found
Alaska Airlines
Wed, Jul 9 - Sat, Jul 12
SEA
Seattle
DEN
Denver
$173 Roundtrip, just found
$173
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Jul 9 from Seattle to Denver, returning Sat, Jul 12, priced at $173 just found
Southwest Airlines
Sat, May 24 - Tue, Jun 3
SEA
Seattle
DEN
Denver
$180 Roundtrip, found 3 hours ago
$180
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Sat, May 24 from Seattle to Denver, returning Tue, Jun 3, priced at $180 found 3 hours ago
American Airlines
Wed, Jun 4 - Tue, Jun 10
SEA
Seattle
DEN
Denver
$217 Roundtrip, found 1 hour ago
$217
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Wed, Jun 4 from Seattle to Denver, returning Tue, Jun 10, priced at $217 found 1 hour ago
Flights from Seattle (SEA) to Denver (DEN)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$100
Distance
1022 mi

Seattle to Denver Flights

The cheapest times to fly from Seattle to Denver

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Denver are during the month of May. You can find some of the cheapest flights from Seattle to Denver with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Seattle to Denver

Sunday is one of the best days to book for cheap flights from Seattle to Denver: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Seattle to Denver

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Denver in 2025. You can also book with separate airlines for your outbound and return journeys, from $50 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Denver flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Denver airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How long does it take to fly from Sea-Tac Airport to DIA airport?
United Airlines operates a direct flight jetting off from Seattle - Tacoma Intl. Airport (SEA) at 4:19PM and coming in to land at DIA airport at 8:02PM — a flying time of 2 hours and 43 minutes. Select your perfect seat, bring some things to keep you busy and the time will rush by.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Denver Airport last minute?
Being the spontaneous type is a rewarding way to travel around, but it isn’t necessarily the smartest method to find a cheap fare. It’s better to book your Sea-Tac Airport to DEN trip ahead of time instead of leaving it till the last minute. Based on flight pricing and demand studies in 2022, we have found that the best time to book domestic flights is between 28 – 35 days ahead of the departure date, and international flights three to four months in advance. Save up that spontaneity for when you’re discovering DEN!
What airline has the least delays from Sea-Tac Airport to DIA airport?
Book a seat with Delta Air Lines from Sea-Tac Airport to Denver Airport and you’re more likely to touch down at the time printed on your boarding card. This carrier clinches first place on this route, with an on-time score of 89%. If your flight is delayed for some reason, the Expedia App is a great way to stay in the loop. Our helpful app will give you notifications right when you need them, from flight delays to gate changes and baggage carousel numbers.
What airports do you fly into for Denver from Seattle?
With Denver Intl. Airport (DEN), Centennial Airport (APA) and Broomfield, CO (BJC-Rocky Mountain Metropolitan) to pick from, flying from Seattle to Denver is easy. The city’s busiest terminal, Denver Intl. Airport (DEN), is about 19 mi east of the center. As well as the price of fares, consider factors like public transportation options from the airport and the distance to your hotel before making your decision. Get your Denver trip off to a fun start by checking out Empower Field at Mile High and Coors Field.
What are the most popular departure times for flights from SEA to DIA airport?
Between 7:00 AM - 8:00 AM is when you’ll find the most Delta Air Lines flights from SEA to Denver Intl. Airport (DEN). Our suggestion? Book a journey that departs sometime in the morning. With air traffic yet to build up, your chances of boarding a delay-free flight are higher.
Can I change the date of my flight from SEA to DIA airport?
Life can throw a spanner in your plans, so Expedia is here to help make amending your journey as easy as possible. To start, access your Sea-Tac Airport to DEN itinerary through the Expedia Trips portal and check the ticket rules and conditions to see if change fees apply. If you booked your fare in the last 24 hours, some airlines will let you cancel without charge and organize new flights. If you booked your fare more than 24 hours ago, contact us through our Customer Service portal to learn more about your options.

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*Available to One Key members.