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$63+ 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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
nov. 19 — nov. 261
mié. 11/19
mié. 11/26
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

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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 39 days in advance, depart on a Friday or Thursday and return on a Friday

Find 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 octubre 20, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/2810:00 amDEN - SEA
Nonstop3h 13mFrontier
mié. 10/291:58 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 10/18$93
This Frontier deal was found by Cheapflights users on 10/20. 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.
jue. 12/2510:16 amDEN - SEA
Nonstop3h 14mFrontier
mar. 1/62:02 pmSEA - DEN
Nonstop2h 49mFrontier
Deal found 10/20$95
This Frontier deal was found by Cheapflights users on 10/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/275:30 amDEN - SEA
Nonstop3h 03mFrontier
sáb. 11/112:58 pmSEA - DEN
Nonstop2h 59mFrontier
Deal found 10/18$96
This Cheapflightsfares deal was found by Cheapflights users on 10/19. 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.
vie. 11/1410:00 amDEN - SEA
Nonstop3h 13mFrontier
dom. 11/162:22 pmSEA - DEN
Nonstop2h 51mFrontier
Deal found 10/19$97
This Orbitz deal was found by Cheapflights users on 10/19. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/1310:00 amDEN - SEA
Nonstop3h 13mMultiple Airlines
dom. 11/165:20 amSEA - DEN
1 stop4h 15mMultiple Airlines
Deal found 10/19$98
This Alaska Airlines deal was found by Cheapflights users on 10/17. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/148:02 pmDEN - SEA
Nonstop3h 11mAlaska Airlines
dom. 11/168:37 amSEA - DEN
Nonstop2h 50mAlaska Airlines
Deal found 10/17$99
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
dom. 11/210:00 amDEN - SEA
Nonstop3h 13mFrontier
lun. 11/1012:58 pmSEA - DEN
1 stop20h 13mFrontier
Deal found 10/19$100
This Frontier deal was found by Cheapflights users on 10/20. 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.
mar. 12/2310:16 amDEN - SEA
Nonstop3h 14mFrontier
mié. 12/311:25 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 10/20$101
This Cheapflightsfares deal was found by Cheapflights users on 10/18. 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.
mié. 11/129:58 amDEN - SEA
Nonstop3h 09mFrontier
jue. 11/138:22 pmSEA - DEN
1 stop12h 05mFrontier
Deal found 10/18$102
This Frontier deal was found by Cheapflights users on 10/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/156:00 amDEN - SEA
1 stop11h 36mFrontier
lun. 12/222:54 pmSEA - DEN
Nonstop2h 49mFrontier
Deal found 10/18$103

Cheap 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 octubre 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$89
(Expedia)

One-way from

$63
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$193

Good round-trip deal

$205 or less

Good one-way deal

$121 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. 12% potential increase in price ($30 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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 octubre 20, 2025.
Use the filters below to find and compare flights from Denver to Seattle that are best for you.

Fly from

Denver

Fly to

Seattle

Route

Depart

Return

Price

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

vie. 11/14

8:02 pm-10:13 pm

Nonstop3h 11m

Seattle/Tacoma Intl

dom. 11/16

8:37 am-12:27 pm

Nonstop2h 50m

$99

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

mié. 12/3

4:40 pm-6:40 pm

Nonstop3h 00m

Seattle/Tacoma Intl

mar. 12/9

9:25 am-4:00 pm

1 stop5h 35m

$102

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

mié. 12/3

4:40 pm-6:40 pm

Nonstop3h 00m

Seattle/Tacoma Intl

mié. 12/10

10:50 am-6:00 pm

1 stop6h 10m

$102

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

vie. 11/14

6:05 am-8:13 am

Nonstop3h 08m

Seattle/Tacoma Intl

lun. 11/17

7:40 pm-11:27 pm

Nonstop2h 47m

$109

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

jue. 12/11

11:41 am-5:35 pm

1 stop6h 54m

Seattle/Tacoma Intl

dom. 12/14

7:55 am-11:44 am

Nonstop2h 49m

$109

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

mar. 1/27

3:35 pm-11:05 pm

1 stop8h 30m

Seattle/Tacoma Intl

mié. 1/28

9:30 am-8:50 pm

2 stops10h 20m

$119

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

mié. 11/26

3:43 pm-5:50 pm

Nonstop3h 07m

Seattle/Tacoma Intl

mié. 12/3

7:55 am-11:44 am

Nonstop2h 49m

$123

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

jue. 12/4

8:55 pm-10:55 pm

Nonstop3h 00m

Seattle/Tacoma Intl

mar. 12/9

6:15 am-2:10 pm

2 stops6h 55m

$128

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

vie. 11/7

6:46 pm-11:32 pm

1 stop5h 46m

Seattle/Tacoma Intl

mié. 11/12

11:10 pm-10:35 am

1 stop10h 25m

$128

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

vie. 12/5

8:55 pm-10:55 pm

Nonstop3h 00m

Seattle/Tacoma Intl

lun. 12/8

9:25 am-6:00 pm

2 stops7h 35m

$128

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/19

Showing 1-10 of 23 results
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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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
CheapTicketsDealPrice 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?

Use this chart to determine the optimal time to book a round-trip flight from Denver to Seattle. Price data was last updated on October 17, 2025.

To ensure you get the cheapest price possible for a flight from Denver to Seattle, you should look to book at least 39 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, February is the cheapest month in which you can book a flight from Denver to Seattle (average of $51). Flying from Denver to Seattle in July is currently the most expensive (average of $118). 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 octubre 20, 2025.

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 30% versus a flight in the morning.

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 October 12, 2025.

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 mornings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Denver to Seattle flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Denver to Seattle trip
Airlines
Frontier

Frontier offers extra comfort seats with 32” separation for a fee, ideal for taller passengers.


Frontier’s Board First option is available with a carry-on purchase or for elite members.

Read more about Frontierby Marisa Garcia
Alaska Airlines

Alaska Airlines offers Wi-Fi for a flat fee, ideal for business travelers needing connectivity.


Alaska’s MileagePlan awards miles based on distance, not ticket price, offering great value.

Read more about Alaska Airlinesby Robert Schrader
Airports
DEN

Use the A Line train for a quick 37-minute ride from downtown Denver to DEN, avoiding costly taxis and rideshares.

Read more about DENby Emily Zemler
SEA

Take the Link light rail from SEA to downtown Seattle for an affordable, 40-minute journey with ample luggage space.

Read more about SEAby Brandon Schultz
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa Garcia

Marisa Garcia

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

Robert Schrader

Robert Schrader

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 Zemler

Emily Zemler

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

Brandon Schultz

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 octubre 20, 2025.
See what other customers who have flown with Alaska Airlines, Delta, and Hawaiian Airlines 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
8.0
Very good
11,134 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Alaska Airlines
8.0
Very good
11,134 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Delta
7.9
Good
7,978 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Hawaiian Airlines
7.8
Good
2,785 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
United Airlines
7.4
Good
8,991 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Frontier
5.8
Fair
3,130 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why

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 37 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, 175 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 Alaska Airlines, Southwest, and Delta fly from Denver to Seattle in about 3h. The time it takes to get you to your destination is usually consistent. Airlines will cover a distance of 1022 mi. Generally, flights for this route are nonstop.

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

    Frontier, at $71, 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 66% cheaper than the other options available to this destination.

  • 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: Virgin Atlantic (93%), Japan Airlines (90%), ANA( 90%).

  • What are the cheapest flights from Denver to Seattle?

    Looking at all options, your cheapest flight can be booked for $69. While the most popular route (Denver Intl - Seattle/Tacoma Intl) can be booked for $78 on average, our data indicates $622 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, February is the cheapest month in which you can book a flight from Denver to Seattle (average of $51). Flying from Denver to Seattle in July is currently the most expensive (average of $118). 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
Tukwila
Tacoma
Lakewood
Ocean Shores
Lynnwood
Edmonds
Leavenworth
Renton
Lacey
Olympia
Kent
Federal Way
Cle Elum
Marysville
Puyallup
Chehalis
Kirkland
Issaquah
Aberdeen

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Denver to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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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 octubre 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$71Average$167FlexibilityNo cancel feeOn-time62%
DeltaCheapest$110Average$237FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$111Average$255FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$136Average$237FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$153Average$301FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$161Average$281FlexibilityNo cancel feeOn-time75%

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