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$96+ Cheap flights from Denver to Seattle (DEN - SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Aug 31 — Sep 71
Mon 8/31
Mon 9/7
1 adult, Economy
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Find cheap flights from Denver to Seattle with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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3. Compare prices and book

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Cheapflights Tip: The best prices from Denver Intl to Seattle/Tacoma Intl are usually found in January or February, booked 47 days in advance, depart on a Friday or Thursday and return on a Friday

Cheap flight deals from Denver to Seattle

Cheapest flights from Denver to Seattle
Explore the most affordable flight options available from Denver to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 1, 2026.

This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2110:10 am
DEN
-
SEA
Nonstop3h 10m
Frontier
Wed 8/267:06 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 7/30$144
This Cheapflightsfares deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2211:05 am
DEN
-
SEA
Nonstop3h 17m
Frontier
Sat 8/297:06 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 7/30$145
This Cheapflightsfares deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/11:07 pm
DEN
-
SEA
Nonstop3h 01m
Frontier
Tue 10/64:27 pm
SEA
-
DEN
Nonstop2h 54m
Frontier
Deal found 7/30$146
This Super.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/307:15 am
DEN
-
SEA
Nonstop3h 04m
Frontier
Thu 9/32:37 pm
SEA
-
DEN
Nonstop2h 56m
Frontier
Deal found 7/31$147
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/11:07 pm
DEN
-
SEA
Nonstop3h 01m
Frontier
Mon 10/54:27 pm
SEA
-
DEN
Nonstop2h 54m
Frontier
Deal found 7/30$148
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/247:15 am
DEN
-
SEA
Nonstop3h 04m
Frontier
Sun 9/67:06 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 7/30$149
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/267:08 pm
DEN
-
SEA
Nonstop3h 00m
Multiple Airlines
Fri 8/287:06 pm
SEA
-
DEN
Nonstop2h 52m
Multiple Airlines
Deal found 7/27$150
This Super.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/271:07 pm
DEN
-
SEA
Nonstop3h 01m
Frontier
Tue 9/294:27 pm
SEA
-
DEN
Nonstop2h 54m
Frontier
Deal found 7/30$151
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/137:00 am
DEN
-
SEA
Nonstop3h 04m
Frontier
Wed 8/197:06 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 7/30$152
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:15 am
DEN
-
SEA
Nonstop3h 04m
Frontier
Sun 8/309:29 pm
SEA
-
DEN
1 stop10h 36m
Frontier
Deal found 7/29$153
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/109:05 am
DEN
-
SEA
1 stop10h 31m
Frontier
Tue 9/228:15 pm
SEA
-
DEN
1 stop12h 17m
Frontier
Deal found 7/29$155

Find flight deals from Denver to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$143
(Frontier)

One-way from

$96
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$248

Good round-trip deal

$212 or less

Good one-way deal

$145 or less
Provider with most accurate pricing for Denver Intl-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Seattle/Tacoma Intl flights.
Search Deals
From Denver Intl to Seattle/Tacoma Intl
Search Deals
One-way flight from Denver Intl to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Denver Intl to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from Denver Intl to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Denver to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 1, 2026.
Use the filters below to find and compare flights from Denver to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 8/22

1:44 pm-9:45 pm

1 stop9h 01m

Seattle/Tacoma Intl

Thu 8/27

9:59 am-6:18 pm

1 stop7h 19m

$227

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 8/24

5:30 pm-12:40 am

1 stop8h 10m

Seattle/Tacoma Intl

Fri 8/28

3:25 pm-11:45 pm

2 stops7h 20m

$227

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 9/12

1:43 pm-6:52 pm

1 stop6h 09m

Seattle/Tacoma Intl

Tue 9/15

2:18 pm-9:13 pm

1 stop5h 55m

$243
Quickest round-trip

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 8/25

9:05 pm-11:05 pm

Nonstop3h 00m

Seattle/Tacoma Intl

Sun 8/30

5:20 am-8:55 am

Nonstop2h 35m

$247

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 9/1

8:08 am-12:50 pm

1 stop5h 42m

Seattle/Tacoma Intl

Wed 9/2

10:18 am-7:26 pm

1 stop8h 08m

$282

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 9/12

11:40 am-8:55 pm

2 stops10h 15m

Seattle/Tacoma Intl

Wed 9/30

12:40 pm-9:25 pm

2 stops7h 45m

$298

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 9/18

10:15 am-5:00 pm

2 stops7h 45m

Seattle/Tacoma Intl

Wed 9/23

7:10 am-3:10 pm

1 stop7h 00m

$298

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 9/22

6:17 am-12:39 pm

1 stop7h 22m

Seattle/Tacoma Intl

Mon 9/28

11:32 am-7:26 pm

1 stop6h 54m

$301

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 8/20

1:43 pm-7:52 pm

1 stop7h 09m

Seattle/Tacoma Intl

Tue 8/25

2:18 pm-9:13 pm

1 stop5h 55m

$302

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 8/27

6:50 pm-8:45 pm

Nonstop2h 55m

Seattle/Tacoma Intl

Thu 9/3

1:55 pm-5:45 pm

Nonstop2h 50m

$308

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Denver to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Denver to Seattle in August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
eDreamsPrice Accuracy2 starsTrust Score*3 stars
Super.comPrice Accuracy-Trust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapTicketsDealPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Denver-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Denver-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Denver-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Denver-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Denver-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Denver to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Denver with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Denver to Seattle

How far ahead should I book a flight from Denver to Seattle?

To ensure you get the cheapest price possible for a flight from Denver to Seattle, you should look to book at least 46 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Denver to Seattle?

Currently, January is the cheapest month in which you can book a flight from Denver to Seattle (average of $140). Flying from Denver to Seattle in July is currently the most expensive (average of $324). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from DEN to SEA?

Find hourly flight availability from Denver to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 1, 2026.

When flying from Denver to Seattle, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 18% versus a flight in the afternoon.

What is the cheapest day to fly from Denver to Seattle?

Use this chart to determine the cheapest time to fly round-trip from Denver to Seattle. Price data was last updated on July 25, 2026.

Travelers seeking maximum savings on their Denver to Seattle flight should consider departing on Thursday evenings when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Denver to Seattle?

Airfare is below average for this route at the moment.

Denver to Seattle flights typically cost between $172 and $330 in September.
The cheapest round-trip price found within the last 5 days was $143 on Frontier (Sep 23-Sep 29).

The best insider tips for Denver to Seattle flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Denver to Seattle trip
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Emily Zemler

Emily Zemler

Expert on DEN

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated August 1, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, andDelta from Denver to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,230 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.
Southwest
8.0
Very good
4,230 reviews
Southwest
8.0
Very good
4,230 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.
Alaska Airlines
7.9
Good
12,749 reviews
Southwest
8.0
Very good
4,230 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.
Delta
7.8
Good
8,493 reviews
Southwest
8.0
Very good
4,230 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.
United Airlines
7.4
Good
10,061 reviews
Southwest
8.0
Very good
4,230 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.
Frontier
5.6
Fair
2,741 reviews
Southwest
8.0
Very good
4,230 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.

Related info for your journey

Find useful and relevant information for your journey from Denver to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Denver to Seattle?

    You will need to book a flight from Denver Intl to Seattle/Tacoma Intl if you want to fly from Denver to Seattle. At least 6 different airlines have flights from Denver Intl (DEN) to Seattle/Tacoma Intl (SEA) on a regular basis. There are 23 flights to Seattle from the Denver airport per day. If you manage to book one that is nonstop, then you can expect the flight time from DEN to SEA to be around 2h 59m.

  • How popular is this Denver to Seattle flight route?

    Within the past month, 109 users have taken a look at flights from Denver Intl to Seattle/Tacoma Intl.

  • How long is the flight from Denver to Seattle?

    Airlines like Delta, Southwest, and Alaska Airlines fly from Denver to Seattle in about 6h 09m. The time it takes to get you to your destination can typically vary by up to 2h 52m. Airlines will cover a distance of 1022 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Denver to Seattle round-trip?

    Frontier, at $55, was found to be the cheapest airline from Denver to Seattle.Alternate airlines to your destination round-trip include Delta and Hawaiian Airlines. Users have found that Frontier is 76% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Denver to Seattle one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $29. Users have also found prices from $58 and $70 on Southwest and Delta, respectively.

  • What are the most reliable airlines from Denver to Seattle?

    Before booking your flight to Seattle from Denver, check out the most reliable airlines to get you to your destination on time: Korean Air (97%), Scandinavian Airlines (94%), Air France( 89%).

  • What are the cheapest flights from Denver to Seattle?

    Looking at all options, your cheapest flight can be booked for $79. While the most popular route (Denver Intl - Seattle/Tacoma Intl) can be booked for $142 on average, our data indicates $1,948 when flying from Denver to Seattle.

  • Can I find deals for flights from Denver to Seattle that include hotel bookings?

    Yes. In addition to deals on Denver to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Denver to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to Seattle.

  • Can I find deals for business class flights from Denver to Seattle?

    Yes. Cheapflights offers flight deals from Denver to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Denver to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Denver to Seattle (average of $140). Flying from Denver to Seattle in July is currently the most expensive (average of $324). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Renton
Tacoma
Lacey
Leavenworth
Olympia
Edmonds
Tukwila
Snoqualmie
Tumwater
Centralia
Puyallup
Kent
Ellensburg
Fife
Marysville
Ocean Shores
Lakewood
Lynnwood
Shoreline

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from Denver to Seattle

Discover the top 6 airlines that operate flights from Denver to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$194FlexibilityNo cancel feeOn-time62%
DeltaCheapest$86Average$233FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$88Average$222FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$117Average$324FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$117Average$317FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$126Average$301FlexibilityNo cancel feeOn-time75%

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