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Cheap flights from Denver to Seattle from £61

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 20/5. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
2 Apr — 9 Apr1
1 adult

Cheapflights Tip: The best prices from Denver Intl to Seattle/Tacoma Intl are usually found in September or October, booked 25 days in advance, depart on a Tuesday or Monday 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 28 March 2025.

Round-trip from

£121

One-way from

£61

Popular in

July

Cheapest in

September

Average price

£156
Delta
  • Delta
  • 6/5-14/5
  • Nonstop
  • 5h 53m total
  • Denver to Seattle
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Alaska Airlines
  • Alaska Airlines
  • 20/5
  • Nonstop
  • 2h 59m total
  • Denver to Seattle
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£6 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£2 potential savings vs. average return price).
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Average for round-trip flights in March 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 28 March 2025.

Tue 6/514:25DEN - SEA
Nonstop3h 03mDelta
Wed 14/507:10SEA - DEN
Nonstop2h 50mDelta
Deal found 27/3£121
Tue 6/507:46DEN - SEA
Nonstop3h 01mUnited Airlines
Wed 14/507:00SEA - DEN
1 stop6h 59mUnited Airlines
Deal found 27/3£126
Mon 12/509:25DEN - SEA
Nonstop3h 06mFrontier
Mon 19/506:00SEA - DEN
Nonstop2h 51mFrontier
Deal found 28/3£128
Sat 26/412:55DEN - SEA
1 stop8h 15mSouthwest
Sat 3/505:10SEA - DEN
Nonstop2h 40mSouthwest
Deal found 27/3£129
Tue 20/520:01DEN - SEA
Nonstop2h 59mHawaiian Airlines
Tue 10/613:09SEA - DEN
Nonstop2h 40mHawaiian Airlines
Deal found 27/3£137
Wed 23/414:39DEN - SEA
Nonstop2h 56mAlaska Airlines
Wed 23/420:20SEA - DEN
Nonstop2h 39mAlaska Airlines
Deal found 27/3£148
Mon 12/509:25DEN - SEA
Nonstop3h 06mMultiple Airlines
Mon 19/521:25SEA - DEN
2 stops12h 15mMultiple Airlines
Deal found 28/3£196

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 28 March 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 6/5

14:25-16:28

Nonstop3h 03m

Seattle/Tacoma Intl

Wed 14/5

07:10-11:00

Nonstop2h 50m

£121

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 6/5

07:46-09:47

Nonstop3h 01m

Seattle/Tacoma Intl

Wed 14/5

07:00-14:59

1 stop6h 59m

£126

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 12/5

09:25-11:31

Nonstop3h 06m

Seattle/Tacoma Intl

Mon 19/5

06:00-09:51

Nonstop2h 51m

£128

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 26/4

12:55-20:10

1 stop8h 15m

Seattle/Tacoma Intl

Sat 3/5

05:10-08:50

Nonstop2h 40m

£129

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 20/5

20:01-22:00

Nonstop2h 59m

Seattle/Tacoma Intl

Tue 10/6

13:09-16:49

Nonstop2h 40m

£137

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 23/4

14:39-16:35

Nonstop2h 56m

Seattle/Tacoma Intl

Wed 23/4

20:20-23:59

Nonstop2h 39m

£148

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 12/5

09:25-11:31

Nonstop3h 06m

Seattle/Tacoma Intl

Mon 19/5

21:25-10:40

2 stops12h 15m

£196

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 20/5

20:01-22:00

Nonstop2h 59m

£61

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 29/4

17:50-00:58

1 stop8h 08m

£65

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 7/5

16:05-23:50

1 stop8h 45m

£68

Flights are sorted by cheapest return flights first.

Deals found on 26/3

Showing 1-10 of 12 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 21 March 2025.

To ensure you get the cheapest price possible for a flight from Denver to Seattle, you should look to book at least 23 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 28 March 2025.

It’s typically best to fly out from Denver to Seattle at midday. Doing so could potentially save you 64% 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 28 March 2025.

The most flights from DEN to SEA are scheduled on a Thursday (39 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (8 on average).

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

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 28 March 2025.
Read reviews from past customers who have flown Southwest, Alaska Airlines and Delta from Denver to Seattle. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very Good
4,274 reviews
Check prices

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very Good
4,274 reviews
Southwest
8.1
Very Good
4,274 reviews
Check prices

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Alaska Airlines
8.0
Very Good
9,797 reviews
Southwest
8.1
Very Good
4,274 reviews
Check prices

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very Good
7,897 reviews
Southwest
8.1
Very Good
4,274 reviews
Check prices

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Hawaiian Airlines
7.9
Good
2,335 reviews
Southwest
8.1
Very Good
4,274 reviews
Check prices

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very Good
4,274 reviews
Check prices

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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.

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

    Flying on Delta is currently your cheapest option to Seattle, with prices starting at £121. Additional return tickets that might be worth considering are offered by United Airlines and Alaska Airlines, with the lowest prices starting at £126 and £129, respectively. Delta is priced at 17% 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 Alaska Airlines, with whom users have recently found tickets for as low as £61. 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: Japan Airlines (92%), KLM (91%), Korean Air (90%).

  • 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

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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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