An Alaska Airlines plane taking off with a snow-capped mountain in the background.

$44 Cheap Flights from Denver (DEN) to Seattle (SEA)

View $44 flight on Wed, Aug 26, 2026Opens in a new window

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

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 30% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Denver to Seattle (DEN-SEA)

Prices were available within the past 7 days and start at $44 for one-way flights and $88 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Aug 27 - Fri, Aug 28
DEN
Denver
SEA
Seattle
$88 Roundtrip, just found
$88
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Aug 27 from Denver to Seattle, returning Fri, Aug 28, priced at $88 just found
Frontier Airlines
Tue, Aug 25 - Sat, Aug 29
DEN
Denver
SEA
Seattle
$98 Roundtrip, found 3 hours ago
$98
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Tue, Aug 25 from Denver to Seattle, returning Sat, Aug 29, priced at $98 found 3 hours ago
Frontier Airlines
Wed, Aug 26 - Tue, Sep 1
DEN
Denver
SEA
Seattle
$107 Roundtrip, found 9 hours ago
$107
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Wed, Aug 26 from Denver to Seattle, returning Tue, Sep 1, priced at $107 found 9 hours ago
Frontier Airlines
Wed, Aug 19 - Thu, Aug 20
DEN
Denver
SEA
Seattle
$112 Roundtrip, found 6 hours ago
$112
Roundtrip
found 6 hours ago
Select Frontier Airlines flight, departing Wed, Aug 19 from Denver to Seattle, returning Thu, Aug 20, priced at $112 found 6 hours ago
Frontier Airlines
Tue, Aug 18 - Sat, Aug 22
DEN
Denver
SEA
Seattle
$113 Roundtrip, just found
$113
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Aug 18 from Denver to Seattle, returning Sat, Aug 22, priced at $113 just found
Frontier Airlines
Sat, Aug 8 - Thu, Aug 27
DEN
Denver
SEA
Seattle
$123 Roundtrip, found 1 day ago
$123
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sat, Aug 8 from Denver to Seattle, returning Thu, Aug 27, priced at $123 found 1 day ago
Southwest Airlines
Tue, Aug 25 - Sat, Aug 29
DEN
Denver
SEA
Seattle
$148 Roundtrip, found 3 hours ago
$148
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Tue, Aug 25 from Denver to Seattle, returning Sat, Aug 29, priced at $148 found 3 hours ago
United
Fri, Aug 21 - Fri, Aug 28
DEN
Denver
SEA
Seattle
$148 Roundtrip, found 12 hours ago
$148
Roundtrip
found 12 hours ago
Select United flight, departing Fri, Aug 21 from Denver to Seattle, returning Fri, Aug 28, priced at $148 found 12 hours ago
American Airlines
Wed, Aug 12 - Wed, Aug 19
DEN
Denver
SEA
Seattle
$267 Roundtrip, found 9 hours ago
$267
Roundtrip
found 9 hours ago
Select American Airlines flight, departing Wed, Aug 12 from Denver to Seattle, returning Wed, Aug 19, priced at $267 found 9 hours ago
JetBlue Airways
Mon, Aug 31 - Tue, Sep 1
DEN
Denver
SEA
Seattle
$558 Roundtrip, found 12 hours ago
$558
Roundtrip
found 12 hours ago
Select JetBlue Airways flight, departing Mon, Aug 31 from Denver to Seattle, returning Tue, Sep 1, priced at $558 found 12 hours ago

Alternative airports near Seattle

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

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $188
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $188

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

January is typically the cheapest month to fly

From $38 - $152 per traveler.

What you need to know for your flight from Denver Intl. to Seattle - Tacoma Intl.

Denver (DEN) to Seattle (SEA) at a glance

Travel from Denver (DEN) to Seattle (SEA) on this domestic short-haul route, where you can choose from a variety of airlines offering flexible options. Whether you’re looking for the cheapest flights from Denver or prefer a full-service experience, you’ll find itineraries that suit your budget and schedule. Discover the essential information you need for flights from Denver International Airport to Seattle-Tacoma International Airport, including flight time and weekly flight availability, as you gear up to explore Seattle's renowned attractions and neighborhoods.

  • Fastest flight duration: around 3 hours non-stop
  • Route distance: roughly 1,000 miles (1,610 km)
  • Flights per week: around 90+ flights with multiple daily departures on average
  • Typical fares (one-way): economy tickets often range from $50–$270, depending on seasonality and how far ahead you book

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

Based on the latest traveler bookings, here are the top airlines favored for flights from Denver to Seattle, focusing on both non-stop and one-stop options. Popular layover spots include Salt Lake City International Airport (SLC) with a roughly 1-hour layover, Ontario International Airport (ONT) in Los Angeles offering about a 50-minute stop, and Sacramento International Airport (SMF) featuring a longer 4-hour layover. These choices allow you to tailor your journey by balancing price, overall travel time, and cabin class to secure the best itinerary.

  • United: This full-service airline provides both non-stop and one-stop flight options, with one-way ticket prices usually between $70 and $315. It represents around 28% of departures along this route, featuring a standard non-stop travel duration of about 3 hours.
  • Alaska Airlines: Offering a range of non-stop and one-stop services, this full-service carrier has one-way fares typically falling between $60 and $280. It makes up approximately 27% of all departures on this route, with a usual non-stop travel time of 3 hours.
  • Delta: As a full-service airline, Delta offers both non-stop and one-stop options, with one-way fares ranging from $55 to $285. This carrier accounts for around 20% of the route's departures, with a standard non-stop flight time of 3 hours.
  • Southwest Airlines: Known as a low-cost carrier, Southwest provides non-stop, one-stop, and multi-stop services, with one-way fares generally priced between $50 and $295. It holds approximately 15% of the departures on this route, featuring a typical non-stop journey time of 3 hours.
  • Frontier Airlines: This low-cost carrier offers both non-stop and one-stop services, with one-way fares often ranging from $50 to $205. Frontier represents about 9% of the departures on this route, maintaining a standard non-stop travel duration of 3 hours.

Travelers have the option to upgrade their flights from Denver to Seattle. Major airlines include Delta, offering first class and premium economy; Alaska Airlines, with first class and business class; and United, which features first class service.

Best time to fly from Denver (DEN) to Seattle (SEA)

The most popular months for travelers flying from Denver to Seattle are March, April, and July, when peak temperatures in Seattle reach up to 67.1°F in July. If you prefer quieter travel, consider October, the least busy time to visit with temperatures around 52.7°F and typically the lowest average one-way fare (around $140). Flight availability peaks in July, with approximately 132 flights per week, making it easier to find convenient departure times. January has the fewest flights, with approximately 69 flights per week.

  • Cheapest time to fly: October usually offers good deals with average one-way fare around $140, roughly 7% cheaper than the yearly average.
  • More budget-friendly months to fly: February, September, and November typically offer average one-way fares of around $144.
  • Most flight options: July has the highest number of flights from Denver to Seattle, with approximately 132 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January40.3°F (4.6°C)Average69$153
February40.5°F (4.7°C)Average73$141
March43.9°F (6.6°C)Slightly High89$153
April48.6°F (9.2°C)Slightly High85$150
May55.8°F (13.2°C)Average103$165
June61.0°F (16.1°C)Average116$159
July67.1°F (19.5°C)Slightly High132$169
August67.5°F (19.7°C)Average116$151
September61.3°F (16.3°C)Average109$144
October52.7°F (11.5°C)Slightly Low105$140
November44.2°F (6.8°C)Slightly Low89$147
December39.2°F (4.0°C)Slightly Low87$159

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative route from Denver (DEN) to Seattle (SEA)

  • Colorado Springs to Seattle (COS-SEA): Colorado Springs Airport (COS) is located approximately 73 miles from Denver International Airport (DEN). One-way economy prices for this route generally fall between $75 and $360, influenced by the travel season and the timing of your booking. This route is frequently serviced by both one-stop and multi-stop flights, with common layover points being Denver International Airport (DEN) and Salt Lake City International Airport (SLC). Major airlines operating on this route include United and Delta. Furthermore, first-class service is also available for travelers.

How to find the best prices for flights from Denver (DEN) to Seattle (SEA)

Getting some of the best deals on flights from Denver to Seattle is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually found when booking 2-8 weeks in advance, which coincides with when most travelers make their reservations. Morning departures, between 5am and 12pm, often provide lower prices and are also the most popular flight times. Additionally, flying on Thursday generally results in cheaper fares, even though Friday is the busiest travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Seattle - Tacoma International Airport from Denver International Airport

Seattle welcomes travelers from Denver with a range of transport options based on price, convenience, and proximity. Seattle city center is approximately a 20-minute drive (covering about 14 miles) from Seattle - Tacoma International Airport, depending on traffic. Here's how to reach Seattle efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in Seattle, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Seattle - Tacoma International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Seattle - Tacoma International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Seattle - Tacoma International Airport, SeaTac/Airport Station, a metro station, is located about 0.3 miles from the airport and can be reached on foot, while Tukwila Station, a train station, is approximately 4.3 miles away and is best accessed by car.

Frequently asked questions

How much does a flight from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) cost?
You can find cheap one-way flights from $44 and cheap return flights from $88 Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) with Expedia. One-way flights typically cost between $62 and $1146, and return flights often range between $155 and $1173. 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 Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma 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 Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
February is the cheapest month to fly from Denver (DEN) to Seattle (SEA), with average round-trip fares around $228. This price is about 12% lower than the average throughout the year, as winter travel tends to be less busy. Other economical months to consider are January and October.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
7 airlines operate nonstop service from DEN to SEA:

  • United operates around 46 direct flights from DEN to SEA every week
  • Delta operates around 29 direct flights from DEN to SEA every week
  • Frontier Airlines operates around 9 direct flights from DEN to SEA every week
  • Hawaiian Airlines operates around 18 direct flights from DEN to SEA every week
  • Qatar Airways operates around 14 direct flights from DEN to SEA every week

What is the cheapest airline that flies from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Sun Country Airlines is one of the cheapest airlines offering connecting flights from Denver Intl. (DEN) to Seattle - Tacoma Intl. (SEA), with round-trip tickets starting from around $380. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
To find a cheap flight from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma 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 Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The best airline to fly with from Denver, CO (DEN) to Seattle, WA (SEA) will differ from traveler to traveler. If you like to fly early, United 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 DEN to SEA, 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 Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
For flights from Denver, CO (DEN) to Seattle, WA (SEA), January and February are the best months to fly. These months are the cheapest, with return flights averaging around $228. This timing allows you to experience Seattle's winter charm, often with fewer tourists around.*Prices based on flights available on Expedia in the last year.
How many flights per day from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
On average, there are around 15 nonstop flights per day from Denver Intl. (DEN) to Seattle - Tacoma Intl. (SEA). For more options, look at flights that include layovers.
What is the earliest flight from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The earliest flight from Denver (DEN) to Seattle (SEA) usually departs at around 12:20 AM, operated by Delta. This is a seasonal service available in December, giving you a chance to maximize your time in Seattle. 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 Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The most popular departure times for flights from Denver International Airport (DEN) to Seattle - Tacoma International Airport (SEA) are in the early morning, from 6am to 9am. About 28% of passengers prefer this time window. Many major carriers, including Alaska Airlines, United, and Southwest Airlines, offer flights during this window. This timing works well because it allows you to arrive in Seattle with plenty of time to enjoy your day.
How long does it take to fly from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Flying nonstop from DEN to SEA takes around 3 hours, with the route covering approximately 1,022 miles. Flights with a layover typically take 5 hours longer than direct options. 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 Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
You can fly first class between DEN and SEA. First class cabins are available on:

  • American Airlines
  • Delta Air Lines
  • United Airlines

How much is a business class flight from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
A direct, return business class ticket from Denver, CO (DEN) to Seattle, WA (SEA) typically costs between $849 - $1,546. A non-stop, one-way business class flight is usually around $401 - $779. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma 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 Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight with Expedia?
It's easy to earn miles on a Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma 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 Seattle from Denver Intl. (DEN)?
From Denver Intl. (DEN), you can fly into Seattle - Tacoma Intl. (SEA) to reach Seattle. Some flights may connect through major hubs like San Diego Intl. (SAN), Los Angeles Intl. (LAX), John Wayne (SNA) before reaching Seattle. 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 Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) at the last minute?
Typically, booking a last minute flight from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma 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 Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight and hotel package?
Securing a Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) Seattle 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 Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
If you booked your Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma 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
Denver Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, JetBlue Airways, Southwest Airlines, United
Roundtrip price
$88
Distance
1022 mi
Average flight time
1 hour 57 mins

Book with confidence

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 August. 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 2026. You can also book with separate airlines for your outbound and return journeys, from $44 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.

 

Denver to Seattle Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

Explore a world of travel with Expedia