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Cheap flights from Denver to Seattle from £58

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 13/8. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
8 Jul — 15 Jul1
1 adult

Cheapflights Tip: The best prices from Denver Intl to Seattle/Tacoma Intl are usually found in October or September, booked 28 days in advance, depart on a Wednesday or Tuesday and return on a Monday

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 3 July 2025.

Round-trip from

£111

One-way from

£58

Popular in

May

Cheapest in

October

Average price

£170
Frontier
  • Frontier
  • 16/8-23/8
  • 1 total stop
  • 8h 53m total
  • Denver to Seattle
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Delta
  • Delta
  • 13/8
  • Nonstop
  • 2h 59m total
  • Denver to Seattle
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£13 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£3 potential savings vs. average return price).
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Average for round-trip flights in July 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 3 July 2025.

Sat 16/807:49DEN - SEA
1 stop6h 04mFrontier
Sat 23/806:25SEA - DEN
Nonstop2h 49mFrontier
Deal found 2/7£111
Tue 26/806:50DEN - SEA
Nonstop2h 54mDelta
Tue 26/815:25SEA - DEN
Nonstop2h 43mDelta
Deal found 2/7£115
Tue 26/811:40DEN - SEA
1 stop4h 53mAlaska Airlines
Tue 26/818:00SEA - DEN
Nonstop2h 47mAlaska Airlines
Deal found 2/7£118
Sat 20/907:45DEN - SEA
Nonstop3h 00mSouthwest
Mon 22/905:00SEA - DEN
Nonstop2h 40mSouthwest
Deal found 3/7£121
Tue 12/808:00DEN - SEA
Nonstop3h 00mHawaiian Airlines
Tue 12/820:17SEA - DEN
Nonstop2h 42mHawaiian Airlines
Deal found 1/7£125
Mon 22/1216:09DEN - SEA
Nonstop3h 00mUnited Airlines
Mon 29/1214:00SEA - DEN
1 stop7h 01mUnited Airlines
Deal found 1/7£163

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 3 July 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

Sat 16/8

07:49-12:53

1 stop6h 04m

Seattle/Tacoma Intl

Sat 23/8

06:25-10:14

Nonstop2h 49m

£111

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 26/8

06:50-08:44

Nonstop2h 54m

Seattle/Tacoma Intl

Tue 26/8

15:25-19:08

Nonstop2h 43m

£115

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 26/8

11:40-15:33

1 stop4h 53m

Seattle/Tacoma Intl

Tue 26/8

18:00-21:47

Nonstop2h 47m

£118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 20/9

07:45-09:45

Nonstop3h 00m

Seattle/Tacoma Intl

Mon 22/9

05:00-08:40

Nonstop2h 40m

£121

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 12/8

08:00-10:00

Nonstop3h 00m

Seattle/Tacoma Intl

Tue 12/8

20:17-23:59

Nonstop2h 42m

£125

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 22/12

16:09-18:09

Nonstop3h 00m

Seattle/Tacoma Intl

Mon 29/12

14:00-22:01

1 stop7h 01m

£163

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 13/8

12:00-13:59

Nonstop2h 59m

£58

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sun 9/11

07:00-09:06

Nonstop3h 06m

£64

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 12/8

19:06-23:02

1 stop4h 56m

£72

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 28/10

15:20-22:55

2 stops8h 35m

£75

Flights are sorted by cheapest return flights first.

Deals found on 2/7

Showing 1-10 of 11 results
1
2

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 27 June 2025.

To ensure you get the cheapest price possible for a flight from Denver to Seattle, you should look to book at least 28 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 3 July 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 3 July 2025.

The most flights from DEN to SEA are scheduled on a Monday (59 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (22 on average).

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 3 July 2025.
Read reviews from past customers who have flown with Alaska Airlines, Southwest, andDelta 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.
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very Good
10,000 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very Good
4,272 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very Good
7,982 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.8
Good
2,542 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,861 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 3 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines flying from Denver to Seattle round-trip?

    Flying on Frontier is currently your cheapest option to Seattle, with prices starting at £111. Additional return tickets that might be worth considering are offered by Delta and Alaska Airlines, with the lowest prices starting at £115 and £118, respectively. Frontier is priced at 25% lower than the current average price of a flight leaving 3 months from now.

  • 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 £58. However, be on the lookout for offers from Hawaiian 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: Singapore Airlines (88%), ANA (82%), United Airlines (76%).

  • 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 Denver?

Book flights to Denver if you plan to visit one of these locations
Tacoma
Leavenworth
Bothell
SeaTac

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