$28 Cheap Flights from Seattle (SEA) to Denver (DEN)

View $28 flight on Thu, Apr 23, 2026Opens in a new window

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

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Cheap Flights from Seattle to Denver (SEA-DEN)

Prices were available within the past 7 days and start at $28 for one-way flights and $56 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, May 12 - Wed, May 13
SEA
Seattle
DEN
Denver
$56 Roundtrip, just found
$56
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, May 12 from Seattle to Denver, returning Wed, May 13, priced at $56 just found
Frontier Airlines
Tue, May 12 - Wed, May 13
SEA
Seattle
DEN
Denver
$66 Roundtrip, just found
$66
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, May 12 from Seattle to Denver, returning Wed, May 13, priced at $66 just found
Frontier Airlines
Mon, Apr 27 - Tue, Apr 28
SEA
Seattle
DEN
Denver
$70 Roundtrip, just found
$70
Roundtrip
just found
Select Frontier Airlines flight, departing Mon, Apr 27 from Seattle to Denver, returning Tue, Apr 28, priced at $70 just found
Frontier Airlines
Sun, Apr 26 - Mon, Apr 27
SEA
Seattle
DEN
Denver
$72 Roundtrip, just found
$72
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, Apr 26 from Seattle to Denver, returning Mon, Apr 27, priced at $72 just found
Frontier Airlines
Mon, Apr 20 - Wed, Apr 22
SEA
Seattle
DEN
Denver
$74 Roundtrip, found 3 hours ago
$74
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Mon, Apr 20 from Seattle to Denver, returning Wed, Apr 22, priced at $74 found 3 hours ago
Southwest Airlines
Sat, Apr 25 - Mon, Apr 27
SEA
Seattle
DEN
Denver
$79 Roundtrip, found 3 hours ago
$79
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Sat, Apr 25 from Seattle to Denver, returning Mon, Apr 27, priced at $79 found 3 hours ago
Frontier Airlines
Mon, Apr 27 - Tue, Apr 28
SEA
Seattle
DEN
Denver
$80 Roundtrip, just found
$80
Roundtrip
just found
Select Frontier Airlines flight, departing Mon, Apr 27 from Seattle to Denver, returning Tue, Apr 28, priced at $80 just found
Delta
Sat, Apr 25 - Mon, Apr 27
SEA
Seattle
DEN
Denver
$82 Roundtrip, found 3 hours ago
$82
Roundtrip
found 3 hours ago
Select Delta flight, departing Sat, Apr 25 from Seattle to Denver, returning Mon, Apr 27, priced at $82 found 3 hours ago
United
Sat, May 9 - Mon, May 18
SEA
Seattle
DEN
Denver
$88 Roundtrip, found 6 hours ago
$88
Roundtrip
found 6 hours ago
Select United flight, departing Sat, May 9 from Seattle to Denver, returning Mon, May 18, priced at $88 found 6 hours ago
Alaska Airlines
Mon, May 11 - Tue, May 12
SEA
Seattle
DEN
Denver
$117 Roundtrip, just found
$117
Roundtrip
just found
Select Alaska Airlines flight, departing Mon, May 11 from Seattle to Denver, returning Tue, May 12, priced at $117 just found

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Alternative airports near Denver

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

Select flight to Denver Intl. DEN. Cheapest option available. Average driving time to city center is 32 minutes. Flights from $177
DEN
Denver Intl.
Cheapest
Average driving time to city center32 min
Flights from $177

Frequently asked questions

How much does a flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) cost?
You can find cheap one-way flights from $28 and cheap return flights from $56 Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) with Expedia. One-way flights typically cost between $69 and $912, and return flights often range between $179 and $1256. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
January is the cheapest month to fly from Seattle (SEA) to Denver (DEN), with average round-trip fares around $200. This is about 23% lower than the average price throughout the year, as travel demand typically decreases after the holiday season. Other economical months to consider are September and October.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
There are 4 airlines offering direct flights from SEA to DEN:

  • United operates around 48 direct flights from SEA to DEN every week
  • Delta operates around 21 direct flights from SEA to DEN every week
  • Frontier Airlines operates around 9 direct flights from SEA to DEN every week
  • Hawaiian Airlines operates around 22 direct flights from SEA to DEN every week

How do I find cheap flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
To find a cheap flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
The best airline to fly with from Seattle, WA (SEA) to Denver, CO (DEN) will differ from traveler to traveler. If you like to fly early, WN offers early morning flights. If price is the most important factor, Frontier Airlines typically offers the lowest fares. WN offers the most daily flights from Seattle to Denver, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
For flights from Seattle to Denver, January and October are the best times to travel. January offers an average price of around $200 for a return flight, making it very budget-friendly. October is also a great option, providing a balance of good prices and pleasant weather, perfect for exploring Denver.*Prices based on flights available on Expedia in the last year.
How many flights per day from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
You can find approximately 14 nonstop flights per day from Seattle - Tacoma Intl. (SEA) to Denver Intl. (DEN). For more options, look at flights that include layovers.
What is the earliest flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
The earliest flight from Seattle-Tacoma International Airport (SEA) to Denver International Airport (DEN) typically departs at around 12:05 AM, operated by American Airlines. This service is seasonal and runs in February and March, making it a great option for early travelers heading to Colorado. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
The most popular departure times for flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) are in the morning, from 6am to 9am. About 24% of passengers prefer this time window. Many major carriers, including Alaska Airlines, Delta, and Southwest Airlines, offer flights during this window. This timing works well because it lets you arrive in Denver early to enjoy the day ahead.
How long does it take to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
A nonstop flight from SEA to DEN typically takes around 2 hours 50 minutes, covering approximately 1,022 miles. Connecting flights on this route usually add 5 hours 10 minutes to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
Select the "Business class" and "First class" filters when looking for SEA to DEN flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How much is a business class flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
A direct, return business class ticket from Seattle (SEA) to Denver (DEN) typically costs between $882 - $1,540. A non-stop, one-way business class flight is usually around $403 - $621. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) if you opt for a connecting flight.*Prices based on flights available on Expedia in the last year.
How do I earn miles on a Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) flight with Expedia?
It's easy to earn miles on a Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Denver from Seattle - Tacoma Intl. (SEA)?
If you're planning to travel to Denver from Seattle - Tacoma Intl. (SEA), you can fly into Denver Intl. (DEN) Some flights may connect through major hubs like Sacramento Intl. (SMF), Oakland Intl. (OAK), Norman Y. Mineta San Jose Intl. (SJC) before reaching Denver. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) at the last minute?
Typically, booking a last minute flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) flight and hotel package?
Securing a Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) Denver Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.)?
If you booked your Seattle, WA (SEA-Seattle - Tacoma Intl.) to Denver, CO (DEN-Denver Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$56
Distance
1022 mi
Average flight time
3 hours 38 mins

Book with confidence

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 2026. You can also book with separate airlines for your outbound and return journeys, from $28 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.

 

Seattle to Denver Flights

*Flight schedules are subject to change.

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*Available to One Key members.