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$95+ 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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Jun 21 — Jun 281
Sun 6/21
Sun 6/28
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”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Denver Intl to Seattle/Tacoma Intl are usually found in January or February, booked 27 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 May 22, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 5/18. 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.
Tue 6/210:39 pm
DEN
-
SEA
1 stop20h 56m
Frontier
Tue 6/93:33 pm
SEA
-
DEN
Nonstop2h 48m
Frontier
Deal found 5/18$157
This Frontier deal was found by Cheapflights users on 5/17. 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.
Tue 6/97:45 am
DEN
-
SEA
Nonstop3h 03m
Frontier
Thu 6/1811:03 am
SEA
-
DEN
1 stop6h 28m
Frontier
Deal found 5/17$158
This Frontier deal was found by Cheapflights users on 5/17. 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.
Tue 6/97:45 am
DEN
-
SEA
Nonstop3h 03m
Frontier
Sun 6/148:12 pm
SEA
-
DEN
1 stop6h 46m
Frontier
Deal found 5/17$159
This Frontier deal was found by Cheapflights users on 5/17. 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.
Sun 6/712:00 pm
DEN
-
SEA
Nonstop3h 01m
Frontier
Thu 6/187:41 pm
SEA
-
DEN
Nonstop2h 55m
Frontier
Deal found 5/17$162
This Cheapflightsfares deal was found by Cheapflights users on 5/20. 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 6/257:45 am
DEN
-
SEA
Nonstop3h 03m
Frontier
Wed 7/17:41 pm
SEA
-
DEN
Nonstop2h 55m
Frontier
Deal found 5/20$164
This Cheapflightsfares deal was found by Cheapflights users on 5/20. 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.
Tue 6/1612:14 pm
DEN
-
SEA
Nonstop3h 04m
Frontier
Tue 6/237:41 pm
SEA
-
DEN
Nonstop2h 55m
Frontier
Deal found 5/20$165
This Kiwi.com deal was found by Cheapflights users on 5/17. 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 6/37:01 pm
DEN
-
SEA
1 stop16h 35m
Frontier
Tue 6/93:33 pm
SEA
-
DEN
Nonstop2h 48m
Frontier
Deal found 5/17$166
This Frontier deal was found by Cheapflights users on 5/20. 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.
Wed 6/1712:14 pm
DEN
-
SEA
Nonstop3h 04m
Frontier
Wed 7/17:41 pm
SEA
-
DEN
Nonstop2h 55m
Frontier
Deal found 5/20$167
This Frontier deal was found by Cheapflights users on 5/17. 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.
Sun 6/712:00 pm
DEN
-
SEA
Nonstop3h 01m
Frontier
Mon 6/158:12 pm
SEA
-
DEN
1 stop6h 46m
Frontier
Deal found 5/17$168
This Kiwi.com deal was found by Cheapflights users on 5/17. 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.
Sun 6/712:00 pm
DEN
-
SEA
Nonstop3h 01m
Frontier
Thu 6/1111:03 am
SEA
-
DEN
1 stop6h 28m
Frontier
Deal found 5/17$170
This Kiwi.com deal was found by Cheapflights users on 5/17. 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.
Sun 6/712:00 pm
DEN
-
SEA
Nonstop3h 01m
Frontier
Sun 6/77:50 pm
SEA
-
DEN
Nonstop3h 04m
Frontier
Deal found 5/17$172

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 May 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$157
(Cheapflightsfares)

One-way from

$95
(Cheapflightsfares)

Popular in

June

Cheapest in

January

Average price

$256

Good round-trip deal

$236 or less

Good one-way deal

$162 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. 18% potential increase in price ($49 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 22, 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

Thu 7/16

6:39 pm-8:41 pm

Nonstop3h 02m

Seattle/Tacoma Intl

Sat 7/18

8:10 am-12:02 pm

Nonstop2h 52m

$325

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 7/21

5:30 pm-11:30 pm

2 stops7h 00m

Seattle/Tacoma Intl

Tue 7/28

3:05 pm-10:35 pm

1 stop6h 30m

$330

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 9/19

12:00 pm-7:30 pm

2 stops8h 30m

Seattle/Tacoma Intl

Tue 9/22

7:10 am-1:40 pm

1 stop5h 30m

$330

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 7/11

4:10 pm-11:10 pm

2 stops8h 00m

Seattle/Tacoma Intl

Thu 7/16

7:30 pm-11:05 pm

Nonstop2h 35m

$340

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 6/24

6:15 am-11:15 am

1 stop6h 00m

Seattle/Tacoma Intl

Tue 6/30

7:30 am-3:50 pm

2 stops7h 20m

$340
Quickest round-trip

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 7/3

9:10 pm-11:05 pm

Nonstop2h 55m

Seattle/Tacoma Intl

Sun 7/5

5:30 am-9:05 am

Nonstop2h 35m

$347

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 8/22

12:00 pm-7:30 pm

2 stops8h 30m

Seattle/Tacoma Intl

Thu 8/27

11:50 am-6:45 pm

1 stop5h 55m

$350

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 8/31

9:00 am-3:50 pm

2 stops7h 50m

Seattle/Tacoma Intl

Tue 9/15

9:25 am-4:55 pm

1 stop6h 30m

$350

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 7/25

7:55 pm-12:35 am

1 stop5h 40m

Seattle/Tacoma Intl

Thu 7/30

7:30 am-4:05 pm

2 stops7h 35m

$350

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 7/15

8:05 pm-12:45 am

1 stop5h 40m

Seattle/Tacoma Intl

Mon 7/20

7:30 am-4:05 pm

2 stops7h 35m

$350

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/21

Showing 1-10 of 22 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 May.
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
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapfaremartPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust 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 26 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 $138). Flying from Denver to Seattle in June is currently the most expensive (average of $275). 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 May 22, 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 evening, which can drop the price by up to 21% versus a flight at noon.

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 May 16, 2026.

Travelers seeking maximum savings on their Denver to Seattle flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday at noon 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?

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 May 22, 2026.
See what other customers who have flown with Alaska Airlines,Southwest, 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.
Alaska Airlines
7.9
Good
12,396 reviews

Overall

7.9

Food

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Alaska Airlines
7.9
Good
12,396 reviews
Alaska Airlines
7.9
Good
12,396 reviews

Overall

7.9

Food

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Southwest
7.9
Good
4,277 reviews
Alaska Airlines
7.9
Good
12,396 reviews

Overall

7.9

Food

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Delta
7.9
Good
8,449 reviews
Alaska Airlines
7.9
Good
12,396 reviews

Overall

7.9

Food

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
United Airlines
7.4
Good
9,751 reviews
Alaska Airlines
7.9
Good
12,396 reviews

Overall

7.9

Food

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Frontier
5.7
Fair
2,944 reviews
Alaska Airlines
7.9
Good
12,396 reviews

Overall

7.9

Food

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well

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 31 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 58m.

  • How popular is this Denver to Seattle flight route?

    Within the past month, 128 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 and Southwest fly from Denver to Seattle in about 3h 02m. The time it takes to get you to your destination can typically vary by up to 3h 58m. 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 74% 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 $33. Users have also found prices from $67 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: KLM (100%), Korean Air (99%), WestJet( 98%).

  • What are the cheapest flights from Denver to Seattle?

    Looking at all options, your cheapest flight can be booked for $89. While the most popular route (Denver Intl - Seattle/Tacoma Intl) can be booked for $153 on average, our data indicates $878 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 $138). Flying from Denver to Seattle in June is currently the most expensive (average of $275). 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
Tacoma
Ocean Shores
Olympia
Lacey
Edmonds
Leavenworth
Snoqualmie
Tumwater
Tukwila
Puyallup
Kent
Lynnwood
Renton
Ellensburg
Fife
Lakewood
Issaquah
Marysville
Shoreline

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 May 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$171FlexibilityNo cancel feeOn-time62%
DeltaCheapest$87Average$218FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$96Average$229FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$117Average$299FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$117Average$269FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$126Average$284FlexibilityNo cancel feeOn-time75%

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