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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 10/12. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
24 Aug — 31 Aug1
1 adult

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 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 19 August 2025.

Round-trip from

£87

One-way from

£56

Popular in

June

Cheapest in

October

Average price

£154
Frontier
  • Frontier
  • 2/10-9/10
  • 1 total stop
  • 9h 04m total
  • Denver to Seattle
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Alaska Airlines
  • Alaska Airlines
  • 10/12
  • Nonstop
  • 3h 08m total
  • Denver to Seattle
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£20 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease (£3 potential savings vs. average return price).
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Average for round-trip flights in August 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 19 August 2025.

Thu 2/1006:00DEN - SEA
1 stop6h 11mFrontier
Thu 9/1013:02SEA - DEN
Nonstop2h 53mFrontier
Deal found 18/8£87
Sat 30/818:45DEN - SEA
Nonstop3h 06mFrontier
Mon 8/906:12SEA - DEN
Nonstop2h 56mFrontier
Deal found 18/8£92
Tue 26/820:55DEN - SEA
Nonstop3h 06mFrontier
Mon 8/916:36SEA - DEN
1 stop5h 50mFrontier
Deal found 18/8£104
Mon 25/807:30DEN - SEA
Nonstop3h 04mFrontier
Mon 8/916:36SEA - DEN
1 stop5h 50mFrontier
Deal found 18/8£109
Wed 27/820:55DEN - SEA
Nonstop3h 06mFrontier
Mon 8/913:49SEA - DEN
1 stop5h 34mFrontier
Deal found 18/8£113
Sat 11/1018:20DEN - SEA
Nonstop3h 01mAlaska Airlines
Tue 21/1008:00SEA - DEN
Nonstop2h 53mAlaska Airlines
Deal found 17/8£116
Thu 9/1019:41DEN - SEA
Nonstop3h 04mDelta
Tue 21/1007:35SEA - DEN
Nonstop2h 53mDelta
Deal found 17/8£122
Sat 25/1007:50DEN - SEA
1 stop8h 25mSouthwest
Sat 25/1016:30SEA - DEN
Nonstop2h 35mSouthwest
Deal found 17/8£123
Fri 26/921:40DEN - SEA
Nonstop2h 55mSouthwest
Sun 28/920:40SEA - DEN
Nonstop2h 40mSouthwest
Deal found 18/8£128

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 19 August 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 2/10

06:00-11:11

1 stop6h 11m

Seattle/Tacoma Intl

Thu 9/10

13:02-16:55

Nonstop2h 53m

£87

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 30/8

18:45-20:51

Nonstop3h 06m

Seattle/Tacoma Intl

Mon 8/9

06:12-10:08

Nonstop2h 56m

£92

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sun 31/8

07:30-09:34

Nonstop3h 04m

Seattle/Tacoma Intl

Mon 8/9

06:12-10:08

Nonstop2h 56m

£92

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 11/10

18:20-20:21

Nonstop3h 01m

Seattle/Tacoma Intl

Tue 21/10

08:00-11:53

Nonstop2h 53m

£116

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 11/10

06:25-08:31

Nonstop3h 06m

Seattle/Tacoma Intl

Sat 18/10

19:30-23:14

Nonstop2h 44m

£116

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 3/12

06:00-08:10

Nonstop3h 10m

Seattle/Tacoma Intl

Sun 7/12

20:14-23:59

Nonstop2h 45m

£122

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 9/10

19:41-21:45

Nonstop3h 04m

Seattle/Tacoma Intl

Tue 21/10

07:35-11:28

Nonstop2h 53m

£122

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 25/10

07:50-15:15

1 stop8h 25m

Seattle/Tacoma Intl

Sat 25/10

16:30-20:05

Nonstop2h 35m

£123

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 26/9

21:40-23:35

Nonstop2h 55m

Seattle/Tacoma Intl

Sun 28/9

20:40-00:20

Nonstop2h 40m

£128

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 22/9

06:55-08:54

Nonstop2h 59m

Seattle/Tacoma Intl

Mon 22/9

18:00-21:42

Nonstop2h 42m

£128

Flights are sorted by cheapest return flights first.

Deals found on 18/8

Showing 1-10 of 18 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 8 August 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 £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 19 August 2025.

It’s typically best to fly out from Denver to Seattle at midday. Doing so could potentially save you 33% on the flight price compared to flying in the morning, which is usually more expensive.

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 19 August 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).

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 6 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 06m. 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 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%), Singapore Airlines (86%), Virgin Atlantic (75%).

  • 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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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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