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Cheap flights from Denver to Seattle from £56

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 24/10. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
18 Oct — 25 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Denver Intl to Seattle/Tacoma Intl are usually found in October or January, booked 39 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

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 18 September 2025.

Round-trip from

£90

One-way from

£56

Popular in

June

Cheapest in

October

Average price

£144
Frontier
  • Frontier
  • 31/10-7/11
  • 1 total stop
  • 23h 01m total
  • Denver to Seattle
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Southwest
  • Southwest
  • 24/10
  • 1 total stop
  • 5h 40m total
  • Denver to Seattle
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Highest demand for flights based on searches. 13% potential increase in price (£18 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease (£2 potential savings vs. average return price).
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Average for round-trip flights in September 2025
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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 18 September 2025.

Fri 31/1010:00DEN - SEA
Nonstop3h 13mFrontier
Fri 7/1112:58SEA - DEN
1 stop19h 48mFrontier
Deal found 16/9£90
Thu 13/1112:18DEN - SEA
Nonstop3h 13mDelta
Tue 18/1115:15SEA - DEN
Nonstop2h 40mDelta
Deal found 16/9£97
Wed 12/1107:05DEN - SEA
1 stop6h 51mDelta
Wed 12/1119:35SEA - DEN
Nonstop2h 47mDelta
Deal found 16/9£105
Thu 13/1122:35DEN - SEA
Nonstop3h 00mSouthwest
Tue 18/1109:25SEA - DEN
2 stops7h 35mSouthwest
Deal found 16/9£108
Mon 20/1018:50DEN - SEA
1 stop7h 00mSouthwest
Tue 21/1009:15SEA - DEN
1 stop7h 55mSouthwest
Deal found 16/9£111
Wed 12/1112:02DEN - SEA
1 stop5h 53mDelta
Sat 15/1109:25SEA - DEN
1 stop4h 34mDelta
Deal found 16/9£112
Wed 15/1019:35DEN - SEA
Nonstop2h 59mUnited Airlines
Thu 16/1005:00SEA - DEN
Nonstop2h 42mUnited Airlines
Deal found 16/9£115
Sun 19/1022:40DEN - SEA
Nonstop2h 55mSouthwest
Tue 21/1013:20SEA - DEN
2 stops9h 30mSouthwest
Deal found 17/9£117
Sat 8/1119:10DEN - SEA
Nonstop3h 03mUnited Airlines
Tue 2/1205:05SEA - DEN
Nonstop2h 43mUnited Airlines
Deal found 15/9£122
Thu 9/1007:15DEN - SEA
Nonstop2h 55mSouthwest
Tue 14/1013:20SEA - DEN
2 stops9h 30mSouthwest
Deal found 16/9£125
Fri 17/1016:00DEN - SEA
Nonstop3h 00mSouthwest
Tue 21/1013:20SEA - DEN
2 stops7h 55mSouthwest
Deal found 15/9£126

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 18 September 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

Thu 9/10

12:25-14:30

Nonstop3h 05m

Seattle/Tacoma Intl

Sat 11/10

19:30-23:14

Nonstop2h 44m

£97

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 1/11

20:02-22:13

Nonstop3h 11m

Seattle/Tacoma Intl

Wed 5/11

08:37-12:27

Nonstop2h 50m

£97

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sun 19/10

06:25-08:31

Nonstop3h 06m

Seattle/Tacoma Intl

Tue 21/10

19:30-23:14

Nonstop2h 44m

£97

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 14/10

18:23-22:22

1 stop4h 59m

Seattle/Tacoma Intl

Tue 21/10

19:30-23:14

Nonstop2h 44m

£105

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 14/11

05:16-09:19

1 stop5h 03m

Seattle/Tacoma Intl

Tue 18/11

17:00-22:29

1 stop4h 29m

£112

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 1/11

18:23-22:22

1 stop4h 59m

Seattle/Tacoma Intl

Wed 5/11

07:10-14:46

1 stop6h 36m

£112

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 10/12

19:45-22:01

Nonstop3h 16m

Seattle/Tacoma Intl

Fri 12/12

19:35-23:21

Nonstop2h 46m

£115

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 2/3

12:30-09:55

1 stop22h 25m

Seattle/Tacoma Intl

Tue 3/3

12:40-16:24

Nonstop2h 44m

£126

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 22/11

22:45-00:50

Nonstop3h 05m

Seattle/Tacoma Intl

Tue 25/11

05:00-08:35

Nonstop2h 35m

£130

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 22/11

06:05-08:13

Nonstop3h 08m

Seattle/Tacoma Intl

Sat 3/1

07:40-11:32

Nonstop2h 52m

£130

Flights are sorted by cheapest return flights first.

Deals found on 16/9

Showing 1-10 of 22 results
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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?

Use this chart to determine the optimal time to book a return flight from Denver to Seattle. Price data was last updated on 12 September 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, January is the cheapest month in which you can book a flight from Denver to Seattle (average of £622). Flying from Denver to Seattle in July is currently the most expensive (average of £946). 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 18 September 2025.

It’s typically best to fly out from Denver to Seattle at midday. Doing so could potentially save you 26% on the flight price compared to flying in the morning, which is usually more expensive.

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.

  • How popular is this Denver to Seattle flight route?

    The Denver Intl to Seattle/Tacoma Intl flight path was viewed by 8 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 05m. Denver and Seattle are separated by a distance of 1022 mi. Generally, flights for this route are direct.

  • What are the cheapest airlines to fly from Denver to Seattle one-way?

    The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as £56. However, be on the lookout for offers from United Airlines and Southwest, as they are both options that can get you from Denver to Seattle for a low price.

  • 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: Sun Country Air (100%), Virgin Atlantic (87%), ANA (82%).

  • 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 £622). Flying from Denver to Seattle in July is currently the most expensive (average of £946). 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
Leavenworth
Bothell
SeaTac

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

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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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