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Cheap flights from Denver to Seattle from £89

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 21/11. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
13 Aug — 20 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 14 July 2026.

Fri 2/1018:05
DEN
-
SEA
1 stop5h 25m
Southwest
Mon 5/1000:10
SEA
-
DEN
1 stop8h 05m
Southwest
Deal found 9/7£141
Mon 3/807:13
DEN
-
SEA
Nonstop3h 04m
Frontier
Thu 6/814:22
SEA
-
DEN
Nonstop2h 56m
Frontier
Deal found 13/7£142
Sat 5/912:55
DEN
-
SEA
1 stop7h 40m
Southwest
Wed 9/912:40
SEA
-
DEN
2 stops7h 40m
Southwest
Deal found 9/7£143
Mon 10/806:20
DEN
-
SEA
1 stop8h 05m
Southwest
Fri 14/809:10
SEA
-
DEN
1 stop7h 05m
Southwest
Deal found 10/7£145
Fri 2/1018:05
DEN
-
SEA
1 stop5h 25m
Southwest
Sat 10/1011:40
SEA
-
DEN
2 stops9h 55m
Southwest
Deal found 10/7£146
Fri 21/816:55
DEN
-
SEA
1 stop8h 00m
Southwest
Sat 29/805:30
SEA
-
DEN
2 stops7h 55m
Southwest
Deal found 9/7£149
Sat 5/913:35
DEN
-
SEA
2 stops7h 55m
Southwest
Tue 8/908:30
SEA
-
DEN
1 stop9h 10m
Southwest
Deal found 9/7£152
Mon 31/810:15
DEN
-
SEA
2 stops7h 50m
Southwest
Fri 11/907:00
SEA
-
DEN
2 stops8h 45m
Southwest
Deal found 9/7£153
Wed 26/805:00
DEN
-
SEA
1 stop7h 25m
United Airlines
Wed 26/815:30
SEA
-
DEN
1 stop8h 29m
United Airlines
Deal found 10/7£153
Fri 16/1005:00
DEN
-
SEA
1 stop5h 54m
United Airlines
Mon 19/1018:05
SEA
-
DEN
Nonstop2h 44m
United Airlines
Deal found 9/7£156
Sat 1/816:10
DEN
-
SEA
2 stops8h 05m
Southwest
Mon 31/818:15
SEA
-
DEN
Nonstop2h 45m
Southwest
Deal found 11/7£157

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 14 July 2026.

Round-trip from

£141

One-way from

£89

Popular in

June

Cheapest in

January

Average price

£230

Good one-way deal

£135 or less
Southwest
  • Southwest
  • 2/10-10/10
  • 2 total stops
  • 12h 55m total
  • Denver to Seattle
Search Deals
Delta
  • Delta
  • 5/1
  • Nonstop
  • 3h 11m total
  • Denver to Seattle
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (£38 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£5 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a one-way flight from Denver Intl to Seattle/Tacoma Intl.
Search Deals

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 14 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
Fastest return journey

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 26/8

21:05-23:05

Nonstop3h 00m

Seattle/Tacoma Intl

Tue 1/9

06:40-10:15

Nonstop2h 35m

£177

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 20/8

19:00-00:20

1 stop6h 20m

Seattle/Tacoma Intl

Mon 24/8

07:00-16:45

2 stops8h 45m

£184

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 3/8

13:25-19:30

2 stops7h 05m

Seattle/Tacoma Intl

Mon 10/8

18:15-22:00

Nonstop2h 45m

£189

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 12/9

09:15-13:40

1 stop5h 25m

Seattle/Tacoma Intl

Sat 19/9

09:20-19:35

2 stops9h 15m

£193

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 4/8

14:40-21:15

2 stops7h 35m

Seattle/Tacoma Intl

Tue 11/8

07:40-14:40

1 stop6h 00m

£196

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sun 11/10

06:00-12:40

2 stops7h 40m

Seattle/Tacoma Intl

Tue 13/10

08:45-15:15

1 stop5h 30m

£202

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 10/8

06:02-08:05

Nonstop3h 03m

Seattle/Tacoma Intl

Tue 11/8

15:55-21:40

1 stop4h 45m

£212

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 11/8

12:50-20:15

2 stops8h 25m

Seattle/Tacoma Intl

Thu 13/8

05:00-14:20

2 stops8h 20m

£215

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 21/8

17:49-23:26

1 stop6h 37m

Seattle/Tacoma Intl

Sat 29/8

13:16-21:13

1 stop6h 57m

£221

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 10/8

17:55-00:20

1 stop7h 25m

Seattle/Tacoma Intl

Tue 11/8

07:40-14:40

1 stop6h 00m

£224

Flights are sorted by cheapest return flights first.

Deals found on 12/7

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 £104). 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 14 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 14 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.
Frontier
5.6
Fair
2,808 reviews
Check prices

Food

4.5

Boarding

5.9

Entertainment

4.3

Crew

6.6

Comfort

5.4

Overall

5.6

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)
Frontier
5.6
Fair
2,808 reviews
Frontier
5.6
Fair
2,808 reviews
Check prices

Food

4.5

Boarding

5.9

Entertainment

4.3

Crew

6.6

Comfort

5.4

Overall

5.6

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 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 3h 02m.

  • How popular is this Denver to Seattle flight route?

    The Denver Intl to Seattle/Tacoma Intl flight path was viewed by 13 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Denver to Seattle?

    Departing from Denver to Seattle will take you 3h. Denver and Seattle are separated by a distance of 1022 mi. Generally, flights for this route are direct.

  • 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 £65. Frontier is priced at 61% 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 £135. On average you can expect to pay £135. The most popular route, (Denver Intl - Seattle/Tacoma Intl), can usually be booked for £105.

  • 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 £104). 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 14 July 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest£65Average£148FlexibilityNo cancel feeOn-time62%
Search Frontier flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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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