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$72+ 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 9/21. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheapflights Tip: The best prices from Denver Intl to Seattle/Tacoma Intl are usually found in October or September, booked 48 days in advance, depart on a Thursday or Friday and return on a Saturday

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 August 18, 2025.

Round-trip from

$116
(Cheapflightsfares)

One-way from

$72
(CheapOair)

Popular in

June

Cheapest in

October

Average price

$209

Good round-trip deal

$166 or less

Good one-way deal

$147 or less
From Denver Intl to Seattle/Tacoma Intl
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One-way flight from Denver Intl to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 15% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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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.
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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 August 18, 2025.

This Frontier deal was found by Cheapflights users on 8/16. 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 9/286:00 amDEN - SEA
1 stop6h 11mFrontier
Tue 10/71:02 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 8/16$118
This Frontier deal was found by Cheapflights users on 8/15. 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.
Sat 9/136:33 pmDEN - SEA
Nonstop3h 06mFrontier
Fri 9/196:12 amSEA - DEN
Nonstop2h 56mFrontier
Deal found 8/15$119
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 10/99:58 amDEN - SEA
Nonstop3h 09mFrontier
Wed 10/158:43 pmSEA - DEN
Nonstop2h 52mFrontier
Deal found 8/16$120
This Frontier deal was found by Cheapflights users on 8/17. 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 10/149:58 amDEN - SEA
Nonstop3h 09mFrontier
Mon 10/208:43 pmSEA - DEN
Nonstop2h 52mFrontier
Deal found 8/17$121
This Cheapflightsfares deal was found by Cheapflights users on 8/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/710:29 pmDEN - SEA
Nonstop3h 01mFrontier
Sat 9/207:00 amSEA - DEN
Nonstop2h 53mFrontier
Deal found 8/17$122
This Frontier deal was found by Cheapflights users on 8/17. 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.
Thu 9/116:30 amDEN - SEA
1 stop12h 03mFrontier
Tue 9/167:00 amSEA - DEN
Nonstop2h 53mFrontier
Deal found 8/17$123
This FlightHub deal was found by Cheapflights users on 8/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/310:29 pmDEN - SEA
1 stop18h 02mFrontier
Mon 9/86:12 amSEA - DEN
Nonstop2h 56mFrontier
Deal found 8/18$124
This FlightHub deal was found by Cheapflights users on 8/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/910:29 pmDEN - SEA
1 stop15h 57mFrontier
Thu 10/161:02 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 8/16$125
This FlightHub deal was found by Cheapflights users on 8/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/208:50 pmDEN - SEA
1 stop16h 35mFrontier
Mon 9/226:12 amSEA - DEN
Nonstop2h 56mFrontier
Deal found 8/17$126
This CheapOair deal was found by Cheapflights users on 8/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/310:29 pmDEN - SEA
1 stop18h 02mFrontier
Fri 9/56:12 amSEA - DEN
Nonstop2h 56mFrontier
Deal found 8/17$127
This Cheapflightsfares deal was found by Cheapflights users on 8/16. 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 8/306:45 pmDEN - SEA
Nonstop3h 06mFrontier
Sat 9/67:00 amSEA - DEN
Nonstop2h 53mFrontier
Deal found 8/16$128
This Trip.com deal was found by Cheapflights users on 8/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/116:20 pmDEN - SEA
Nonstop3h 01mMultiple Airlines
Thu 10/161:02 pmSEA - DEN
Nonstop2h 53mMultiple Airlines
Deal found 8/16$129

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 18, 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

Fri 9/26

10:29 pm-12:30 am

Nonstop3h 01m

Seattle/Tacoma Intl

Mon 9/29

1:47 pm-3:49 pm

1 stop25h 02m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 9/16

8:55 pm-10:59 pm

Nonstop3h 04m

Seattle/Tacoma Intl

Tue 9/23

7:00 am-10:53 am

Nonstop2h 53m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 9/9

8:55 pm-10:59 pm

Nonstop3h 04m

Seattle/Tacoma Intl

Mon 9/15

12:30 pm-7:31 pm

1 stop6h 01m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 9/19

10:29 pm-12:30 am

Nonstop3h 01m

Seattle/Tacoma Intl

Mon 9/22

1:47 pm-4:00 am

1 stop13h 13m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 9/17

10:29 pm-3:31 pm

1 stop18h 02m

Seattle/Tacoma Intl

Sun 9/21

6:12 am-10:08 am

Nonstop2h 56m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 9/24

8:55 pm-10:59 pm

Nonstop3h 04m

Seattle/Tacoma Intl

Thu 10/2

12:05 pm-12:26 am

1 stop11h 21m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 9/10

10:29 pm-3:31 pm

1 stop18h 02m

Seattle/Tacoma Intl

Mon 9/22

6:12 am-10:08 am

Nonstop2h 56m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 8/30

6:45 pm-8:51 pm

Nonstop3h 06m

Seattle/Tacoma Intl

Mon 9/15

6:12 am-10:08 am

Nonstop2h 56m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 9/3

10:29 pm-3:31 pm

1 stop18h 02m

Seattle/Tacoma Intl

Mon 9/22

6:12 am-10:08 am

Nonstop2h 56m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 10/3

10:29 pm-12:30 am

Nonstop3h 01m

Seattle/Tacoma Intl

Sun 10/5

4:36 pm-5:38 pm

1 stop24h 02m

$118

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/16

Showing 1-10 of 15 results
1
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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

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 August 8, 2025.

To ensure you get the cheapest price possible for a flight from Denver to Seattle, you should look to book at least 48 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 $238). Flying from Denver to Seattle in June is currently the most expensive (average of $388). 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 18, 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 afternoon, which can drop the price by up to 32% 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 August 10, 2025.

Travelers seeking maximum savings on their Denver to Seattle flight should consider departing on Friday afternoons 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.

Weekly flight availability from Denver to Seattle

Explore weekly flight availability from Denver to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 18, 2025.

The most flights from DEN to SEA are scheduled on a Monday (62 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (9 on average).

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 18, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta 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
10,000 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Southwest
8.0
Very good
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

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
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

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
8,925 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

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
3,212 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

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 32 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 54m.

  • How popular is this Denver to Seattle flight route?

    Within the past month, 209 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 Frontier fly from Denver to Seattle in about 3h 01m. 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 $61, 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 71% 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: Sun Country Air (100%), Singapore Airlines (86%), Virgin Atlantic( 75%).

  • What are the cheapest flights from Denver to Seattle?

    Looking at all options, your cheapest flight can be booked for $76. While the most popular route (Denver Intl - Seattle/Tacoma Intl) can be booked for $93 on average our data indicates $471 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 $238). Flying from Denver to Seattle in June is currently the most expensive (average of $388). 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
Ocean Shores
Lakewood
Lynnwood
Lacey
Leavenworth
Renton
Olympia
Puyallup
Kent
Cle Elum
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline
Federal Way
Shelton

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 August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$61Average$162FlexibilityNo cancel feeOn-time62%
DeltaCheapest$108Average$234FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$109Average$255FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$137Average$230FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$148Average$299FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$157Average$279FlexibilityNo cancel feeOn-time75%

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