Cheap flights from Denver to Seattle from £90

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 23/9. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
1 Aug — 8 Aug1
1 adult
1 adult, Economy, 0 bags
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 Tuesday or Monday and return on a Monday

Cheap flight deals from Denver to Seattle

Enter your travel dates to find the best prices.

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 2 July 2026.

Sun 27/922:29
DEN
-
SEA
Nonstop2h 58m
Frontier
Wed 30/921:16
SEA
-
DEN
1 stop11h 18m
Frontier
Deal found 28/6£151
Tue 21/709:13
DEN
-
SEA
Nonstop3h 07m
Frontier
Tue 21/720:13
SEA
-
DEN
1 stop11h 52m
Frontier
Deal found 29/6£157
Fri 18/907:45
DEN
-
SEA
Nonstop3h 06m
Frontier
Sun 20/919:41
SEA
-
DEN
Nonstop2h 53m
Frontier
Deal found 28/6£173
Sat 1/818:39
DEN
-
SEA
Nonstop3h 02m
Delta
Tue 11/820:07
SEA
-
DEN
Nonstop2h 51m
Delta
Deal found 1/7£179
Sat 12/1217:52
DEN
-
SEA
1 stop6h 29m
United Airlines
Wed 16/1205:07
SEA
-
DEN
Nonstop2h 43m
United Airlines
Deal found 1/7£183
Sat 25/706:00
DEN
-
SEA
Nonstop3h 00m
United Airlines
Wed 29/715:33
SEA
-
DEN
1 stop6h 11m
United Airlines
Deal found 30/6£186
Tue 3/1112:30
DEN
-
SEA
2 stops7h 05m
Southwest
Tue 10/1109:25
SEA
-
DEN
Nonstop2h 35m
Southwest
Deal found 28/6£187
Tue 25/822:49
DEN
-
SEA
1 stop12h 50m
Frontier
Sat 29/820:53
SEA
-
DEN
1 stop5h 55m
Frontier
Deal found 1/7£189
Tue 21/706:15
DEN
-
SEA
2 stops8h 20m
Southwest
Tue 21/719:30
SEA
-
DEN
Nonstop2h 40m
Southwest
Deal found 27/6£190
Sat 15/808:02
DEN
-
SEA
Nonstop2h 59m
United Airlines
Sat 22/805:00
SEA
-
DEN
Nonstop2h 45m
United Airlines
Deal found 28/6£192

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 2 July 2026.

Round-trip from

£151

One-way from

£90

Popular in

June

Cheapest in

January

Average price

£223

Good round-trip deal

£246 or less

Good one-way deal

£137 or less
Frontier
  • Frontier
  • 27/9-30/9
  • 1 total stop
  • 14h 16m total
  • Denver to Seattle
United Airlines
  • United Airlines
  • 23/9
  • Nonstop
  • 2h 59m total
  • Denver to Seattle
Highest demand for flights based on searches. 23% potential increase in price (£37 potential increase over avg. return price).
Cheapest flight prices on average. 4% potential price decrease (£6 potential savings vs. average return price).
Average for round-trip flights in July 2026
Price to beat on a round-trip flight from Denver Intl to Seattle/Tacoma Intl.
Price to beat on a one-way flight from Denver Intl to Seattle/Tacoma Intl.

Cheapflights Fare Finder

 
Customise 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 858,174 searches. Data last updated 2 July 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 return flight

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 14/12

06:45-08:59

Nonstop3h 14m

Seattle/Tacoma Intl

Tue 22/12

19:40-23:28

Nonstop2h 48m

£198

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 25/8

12:50-20:15

2 stops8h 25m

Seattle/Tacoma Intl

Sat 29/8

10:50-18:35

2 stops6h 45m

£201
Fastest return journey

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 6/8

18:43-20:45

Nonstop3h 02m

Seattle/Tacoma Intl

Tue 11/8

13:55-17:48

Nonstop2h 53m

£201

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 27/7

13:25-19:30

2 stops7h 05m

Seattle/Tacoma Intl

Tue 28/7

19:30-23:10

Nonstop2h 40m

£213

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 1/9

12:50-20:15

2 stops8h 25m

Seattle/Tacoma Intl

Sat 5/9

09:20-19:35

2 stops9h 15m

£216

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 24/11

06:45-08:59

Nonstop3h 14m

Seattle/Tacoma Intl

Fri 27/11

05:45-11:55

1 stop5h 10m

£216

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 20/7

13:25-19:30

2 stops7h 05m

Seattle/Tacoma Intl

Tue 4/8

09:25-16:55

1 stop6h 30m

£217

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 21/8

10:15-17:05

2 stops7h 50m

Seattle/Tacoma Intl

Tue 25/8

05:20-13:30

1 stop7h 10m

£217

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 20/7

13:25-19:30

2 stops7h 05m

Seattle/Tacoma Intl

Tue 21/7

15:25-23:10

1 stop6h 45m

£220

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 7/10

12:30-21:10

2 stops9h 40m

Seattle/Tacoma Intl

Mon 12/10

14:15-23:30

1 stop8h 15m

£220

Flights are sorted by cheapest return flights first.

Deals found on 27/6

Showing 1-10 of 22 resultsSorted by cheapest first
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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 return 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 £105). Flying from Denver to Seattle in June is currently the most expensive (average of £235). 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 2 July 2026.

It’s typically best to fly out from Denver to Seattle in the evening. Doing so could potentially save you 55% on the flight price compared to flying in the afternoon, which is usually more expensive.

How much does it cost for a return flight from Denver to Seattle?

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 2 July 2026.
Read reviews from past customers who have flown with Frontier from Denver to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Crew

6.5

Boarding

5.9

Entertainment

4.3

Overall

5.6

Comfort

5.4

Food

4.5

Reviews

1 / 20
4.0
Okay

Chase,Nov 2025

SLC - SEA

Worst part was not frontiers fault but being stuck on the tarmac for an hour at our arrival destination because of another planes issue and the lack of clear communication (said from the pilot himself)

Crew

6.5

Boarding

5.9

Entertainment

4.3

Overall

5.6

Comfort

5.4

Food

4.5

Reviews

1 / 20
4.0
Okay

Chase,Nov 2025

SLC - SEA

Worst part was not frontiers fault but being stuck on the tarmac for an hour at our arrival destination because of another planes issue and the lack of clear communication (said from the pilot himself)

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 1 airline has flights from Denver Intl (DEN) to Seattle/Tacoma Intl (SEA) on a regular basis. There are 30 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 3h 00m.

  • How popular is this Denver to Seattle flight route?

  • How long is the flight from Denver to Seattle?

    Departing from Denver to Seattle will take you 3h 14m. Denver and Seattle are separated by a distance of 1022 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What is the cheapest airline to fly from Denver to Seattle round-trip?

    Flying on Frontier is currently your cheapest option to Seattle, with prices starting at £66. Frontier is priced at 60% lower than the current average price of a flight leaving 3 months from now.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Denver to Seattle on time: Korean Air (97%), WestJet (96%), Air France (92%).

  • What are the cheapest flights from Denver to Seattle?

    The cheapest flight price from Denver to Seattle is £136. On average you can expect to pay £191. The most popular route, (Denver Intl - Seattle/Tacoma Intl), can usually be booked for £132.

  • 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 holiday 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 £105). Flying from Denver to Seattle in June is currently the most expensive (average of £235). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Federal Way
SeaTac

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Top airline flying from Denver to Seattle

Discover the top airline 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 858,174 searches. Data last updated 2 July 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest£66Average£149FlexibilityNo cancel feeOn-time62%
Search Frontier flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Denver to Seattle?

Deals for Denver to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Denver to Seattle?

Cheapflights helps you find that perfect flight to Seattle from Denver by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Denver to Seattle with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Denver to Seattle, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Denver to Seattle become cheaper?

Not ready to book yet? You can track prices for flights from Denver to Seattle on Cheapflights with our Price Alert feature and get notified when better prices are available.

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