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Cheap flights from Denver to Seattle from £41

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 9/12. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
4 Dec — 11 Dec1
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 39 days in advance, depart on a Tuesday or Wednesday and return on a Monday

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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 4 November 2025.

Wed 3/1208:05DEN - SEA
Nonstop3h 05mUnited Airlines
Sun 7/1208:40SEA - DEN
Nonstop2h 46mUnited Airlines
Deal found 3/11£68
Sat 6/1206:05DEN - SEA
Nonstop3h 10mDelta
Sat 6/1219:35SEA - DEN
Nonstop2h 46mDelta
Deal found 3/11£74
Tue 2/1206:45DEN - SEA
Nonstop3h 13mAlaska Airlines
Tue 9/1207:55SEA - DEN
Nonstop2h 49mAlaska Airlines
Deal found 3/11£78
Tue 2/1206:05DEN - SEA
Nonstop3h 10mDelta
Sun 7/1219:35SEA - DEN
Nonstop2h 46mDelta
Deal found 3/11£81
Sun 7/1222:35DEN - SEA
Nonstop3h 00mSouthwest
Tue 9/1206:35SEA - DEN
1 stop8h 40mSouthwest
Deal found 3/11£86
Tue 2/1205:30DEN - SEA
1 stop4h 55mDelta
Tue 9/1219:35SEA - DEN
Nonstop2h 46mDelta
Deal found 3/11£89
Thu 18/1210:16DEN - SEA
Nonstop3h 14mMultiple Airlines
Thu 18/1220:17SEA - DEN
Nonstop2h 42mMultiple Airlines
Deal found 2/11£91
Wed 26/1106:14DEN - SEA
Nonstop3h 12mAlaska Airlines
Wed 10/1207:55SEA - DEN
Nonstop2h 49mAlaska Airlines
Deal found 4/11£94
Thu 18/1207:05DEN - SEA
1 stop6h 52mDelta
Tue 30/1219:35SEA - DEN
Nonstop2h 48mDelta
Deal found 3/11£97
Fri 12/1218:22DEN - SEA
1 stop6h 58mDelta
Sun 14/1205:25SEA - DEN
1 stop4h 44mDelta
Deal found 4/11£104
Tue 9/1208:10DEN - SEA
Nonstop3h 05mSouthwest
Thu 11/1209:25SEA - DEN
2 stops7h 35mSouthwest
Deal found 2/11£105

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 4 November 2025.

Round-trip from

£68

One-way from

£41

Popular in

June

Cheapest in

January

Average price

£146
United Airlines
  • United Airlines
  • 3/12-7/12
  • Nonstop
  • 5h 51m total
  • Denver to Seattle
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 9/12
  • 1 total stop
  • 6h 54m total
  • Denver to Seattle
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£18 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£2 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
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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 4 November 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

Tue 2/12

06:45-08:58

Nonstop3h 13m

Seattle/Tacoma Intl

Tue 9/12

07:55-11:44

Nonstop2h 49m

£78

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 28/2

06:29-08:40

Nonstop3h 11m

Seattle/Tacoma Intl

Mon 2/3

19:40-23:25

Nonstop2h 45m

£89

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 18/2

06:29-08:40

Nonstop3h 11m

Seattle/Tacoma Intl

Sun 22/2

08:10-12:11

Nonstop3h 01m

£89

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 5/3

18:50-21:10

Nonstop3h 20m

Seattle/Tacoma Intl

Mon 9/3

19:40-23:22

Nonstop2h 42m

£89

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 16/1

18:50-21:10

Nonstop3h 20m

Seattle/Tacoma Intl

Tue 20/1

13:45-17:34

Nonstop2h 49m

£104

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 2/12

05:30-09:25

1 stop4h 55m

Seattle/Tacoma Intl

Tue 9/12

13:40-18:58

1 stop4h 18m

£104

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 24/2

18:50-21:10

Nonstop3h 20m

Seattle/Tacoma Intl

Sat 28/2

13:40-17:29

Nonstop2h 49m

£104

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sun 1/3

06:29-08:40

Nonstop3h 11m

Seattle/Tacoma Intl

Wed 4/3

19:40-23:25

Nonstop2h 45m

£104

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 25/2

08:35-10:45

Nonstop3h 10m

Seattle/Tacoma Intl

Sat 28/2

05:50-14:05

1 stop7h 15m

£112

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 4/3

11:30-14:43

1 stop4h 13m

Seattle/Tacoma Intl

Tue 10/3

18:55-22:39

Nonstop2h 44m

£112

Flights are sorted by cheapest return flights first.

Deals found on 3/11

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 31 October 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, February is the cheapest month in which you can book a flight from Denver to Seattle (average of £39). Flying from Denver to Seattle in July is currently the most expensive (average of £91). 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 4 November 2025.

It’s typically best to fly out from Denver to Seattle in the evening. Doing so could potentially save you 34% 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 09m. 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 £45. However, be on the lookout for offers from United Airlines and Alaska Airlines, 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: Japan Airlines (93%), Condor (90%), Virgin Atlantic (89%).

  • 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, February is the cheapest month in which you can book a flight from Denver to Seattle (average of £39). Flying from Denver to Seattle in July is currently the most expensive (average of £91). 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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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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