$31 Cheap Flights from Denver (DEN) to Seattle (SEA)

View $31 flight on Tue, Sep 23, 2025Opens in a new window

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

Today's featured flight deals from Denver Intl. Airport (DEN) to Seattle-Tacoma International Airport (SEA)

Nonstop
Carry-on included
Lower price than typical

Cheap Flights from Denver to Seattle (DEN-SEA)

Prices were available within the past 7 days and start at $31 for one-way flights and $50 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, Sep 13 - Sun, Sep 21
DEN
Denver
SEA
Seattle
$50 Roundtrip, found 3 hours ago
$50
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Sat, Sep 13 from Denver to Seattle, returning Sun, Sep 21, priced at $50 found 3 hours ago
Frontier Airlines
Wed, Oct 8 - Sat, Oct 11
DEN
Denver
SEA
Seattle
$61 Roundtrip, just found
$61
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Oct 8 from Denver to Seattle, returning Sat, Oct 11, priced at $61 just found
Frontier Airlines
Tue, Sep 9 - Tue, Sep 16
DEN
Denver
SEA
Seattle
$67 Roundtrip, found 2 hours ago
$67
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Tue, Sep 9 from Denver to Seattle, returning Tue, Sep 16, priced at $67 found 2 hours ago
Frontier Airlines
Fri, Sep 19 - Wed, Sep 24
DEN
Denver
SEA
Seattle
$69 Roundtrip, found 4 hours ago
$69
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Fri, Sep 19 from Denver to Seattle, returning Wed, Sep 24, priced at $69 found 4 hours ago
Frontier Airlines
Tue, Sep 23 - Thu, Sep 25
DEN
Denver
SEA
Seattle
$82 Roundtrip, just found
$82
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Sep 23 from Denver to Seattle, returning Thu, Sep 25, priced at $82 just found
Frontier Airlines
Tue, Sep 16 - Wed, Sep 24
DEN
Denver
SEA
Seattle
$91 Roundtrip, just found
$91
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Sep 16 from Denver to Seattle, returning Wed, Sep 24, priced at $91 just found
Hawaiian Airlines
Wed, Dec 3 - Fri, Dec 12
DEN
Denver
SEA
Seattle
$157 Roundtrip, found 1 day ago
$157
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Wed, Dec 3 from Denver to Seattle, returning Fri, Dec 12, priced at $157 found 1 day ago
Southwest Airlines
Wed, Oct 8 - Sat, Oct 11
DEN
Denver
SEA
Seattle
$157 Roundtrip, just found
$157
Roundtrip
just found
Select Southwest Airlines flight, departing Wed, Oct 8 from Denver to Seattle, returning Sat, Oct 11, priced at $157 just found
United
Sat, Nov 1 - Wed, Nov 5
DEN
Denver
SEA
Seattle
$157 Roundtrip, found 2 hours ago
$157
Roundtrip
found 2 hours ago
Select United flight, departing Sat, Nov 1 from Denver to Seattle, returning Wed, Nov 5, priced at $157 found 2 hours ago
American Airlines
Tue, Oct 14 - Wed, Oct 22
DEN
Denver
SEA
Seattle
$177 Roundtrip, found 4 hours ago
$177
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Tue, Oct 14 from Denver to Seattle, returning Wed, Oct 22, priced at $177 found 4 hours ago

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

January is typically the cheapest month to fly

From $65 - $246 per traveler.

Graph displaying average flight prices per month

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Boeing Field BFI. Average driving time to city center is 10 minutes. Flights from $825
BFI
Boeing Field
Average driving time to city center10 min
Flights from $825
Flights from Denver (DEN) to Seattle (SEA)
Origin airport
Denver Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, Sun Country Airlines, United
Roundtrip price
$66
Distance
1022 mi
Average flight time
1 hour 55 mins

Denver to Seattle Flights

The cheapest times to fly from Denver to Seattle

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 Denver to Seattle are during the month of September. You can find some of the cheapest flights from Denver to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Denver to Seattle

Sunday is one of the best days to book for cheap flights from Denver to Seattle: 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 Denver to Seattle

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 Denver to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $31 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 Denver to Seattle 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 Denver to Seattle 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 much does a flight from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) cost?
Get a cheap one-way flight from $31 or cheap return flight from $50 from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
The cheapest month to fly from DEN to SEA is September, when demand is low. Off-peak season is usually when airlines offer better prices between these airports.
Which airlines fly direct from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
Select from 5 airlines offering direct routes from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA). These include:

  • United Airlines
  • Delta Air Lines
  • Southwest Airlines
  • Alaska Airlines
  • Frontier Airlines

What is the cheapest airline that flies from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
The cheapest airline to offer flights between Denver Intl. Airport (DEN) and Seattle - Tacoma Intl. Airport (SEA) can change depending on when you plan to fly. However, you'll often find that low-cost carriers such as Southwest Airlines and ANA provide some of the most affordable options. Use Expedia's search tool to compare airlines in one place and find the right DEN to SEA flight that suits your budget.
How many flights per day from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
Daily, an average of 14 direct flights take off from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA). Choose the departure date that fits your schedule best.
What are the most popular departure times for flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
The 7 PM departures from DEN to SEA are the busiest. Prices can be higher for these popular slots. If you're hoping to save money, pick a less crowded time to fly.
What day of the week has the most flights from DEN to SEA?
Fly on a Monday if you're after the best selection of flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA).
What is the earliest flight from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
Take the earliest flight at around 6:25AM UTC-7, heading out of Denver Intl. Airport (DEN). You'll be in the air for roughly 3h 14m, coming in to land at Seattle - Tacoma Intl. Airport (SEA) at approximately 8:39AM UTC-8.
How long does it take to fly from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
The average flight duration from DEN to SEA is 3 hours and 8 minutes, covering a distance of 1,000 mi.
What airline has the least delays from DEN to SEA?
Frontier Airlines has the strongest track record for on-time direct flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA), with an on-time rating of 84%. Use the Expedia App to view your flight status before you go and get real-time alerts about any trip changes.
What is the best time to fly from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
To avoid possible delays on the Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) route, fly before 3 PM. Flights after this time have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Seattle from Denver Intl. Airport (DEN)?
If you're taking a direct flight from Denver Intl. Airport (DEN) to Seattle, Seattle - Tacoma Intl. Airport (SEA) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Last-minute fares from DEN to SEA are usually more expensive. To lock in the cheapest rates, start searching for flights well in advance. That being said, if you can play around with your travel dates, you may find a cheap ticket right before your trip.
Is it cheaper to book a DEN to SEA flight and hotel package?
Opting for a DEN to SEA flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Pick from our impressive range of stays and then add activities, car rentals and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
In most cases, you can reschedule or cancel your DEN to SEA flight. However, additional fees may apply, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you want more details, visit our Customer Service portal.

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*Available to One Key members.