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Cheap flights from Seattle to Denver from £81

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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
19 May — 26 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Denver

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Denver
Explore the most affordable flight options available from Seattle to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 April 2026.

Thu 4/619:50
SEA
-
DEN
Nonstop3h 04m
Frontier
Tue 30/608:44
DEN
-
SEA
1 stop11h 13m
Frontier
Deal found 16/4£133
Wed 6/505:05
SEA
-
DEN
Nonstop2h 44m
United Airlines
Wed 13/520:58
DEN
-
SEA
Nonstop3h 01m
United Airlines
Deal found 15/4£160
Sat 9/518:00
SEA
-
DEN
Nonstop2h 49m
Alaska Airlines
Tue 12/508:00
DEN
-
SEA
Nonstop3h 07m
Alaska Airlines
Deal found 16/4£161
Thu 28/519:59
SEA
-
DEN
Nonstop2h 53m
Delta
Sat 6/618:35
DEN
-
SEA
Nonstop3h 02m
Delta
Deal found 16/4£168
Thu 30/419:12
SEA
-
DEN
Nonstop2h 47m
Frontier
Sun 3/507:15
DEN
-
SEA
Nonstop3h 12m
Frontier
Deal found 16/4£169
Wed 3/607:30
SEA
-
DEN
Nonstop2h 54m
Alaska Airlines
Wed 3/614:19
DEN
-
SEA
1 stop8h 11m
Alaska Airlines
Deal found 16/4£171
Wed 6/507:50
SEA
-
DEN
2 stops8h 20m
Southwest
Wed 13/520:30
DEN
-
SEA
Nonstop3h 00m
Southwest
Deal found 14/4£172
Mon 25/507:30
SEA
-
DEN
Nonstop2h 54m
Alaska Airlines
Tue 26/506:00
DEN
-
SEA
Nonstop3h 05m
Alaska Airlines
Deal found 16/4£175
Fri 8/513:40
SEA
-
DEN
Nonstop3h 00m
Delta
Mon 11/506:05
DEN
-
SEA
Nonstop3h 04m
Delta
Deal found 17/4£176

Find flight deals from Seattle to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Denver (DEN). 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 April 2026.

Round-trip from

£114

One-way from

£81

Popular in

June

Cheapest in

January

Average price

£175
Frontier
  • Frontier
  • 7/5-2/6
  • 1 total stop
  • 15h 19m total
  • Seattle to Denver
Search Deals
Delta
  • Delta
  • 9/6
  • Nonstop
  • 2h 48m total
  • Seattle to Denver
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£11 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£3 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Seattle to Denver 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 April 2026.
Use the filters below to find and compare flights from Seattle to Denver that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 6/5

19:05-22:56

Nonstop2h 51m

Denver Intl

Wed 13/5

07:40-09:40

Nonstop3h 00m

£160

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 8/5

13:40-17:40

Nonstop3h 00m

Denver Intl

Mon 11/5

06:05-08:09

Nonstop3h 04m

£176

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 15/5

19:59-23:52

Nonstop2h 53m

Denver Intl

Sun 17/5

06:05-08:09

Nonstop3h 04m

£190

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 8/5

17:25-00:59

1 stop6h 34m

Denver Intl

Sun 10/5

07:40-09:40

Nonstop3h 00m

£194

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 9/5

10:22-18:25

1 stop7h 03m

Denver Intl

Tue 12/5

13:02-21:45

1 stop9h 43m

£213

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 4/6

07:30-16:05

2 stops7h 35m

Denver Intl

Tue 30/6

18:55-23:10

1 stop5h 15m

£227

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 20/6

19:55-23:45

Nonstop2h 50m

Denver Intl

Sun 28/6

06:30-08:31

Nonstop3h 01m

£234
Fastest return journey

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 23/5

05:00-08:43

Nonstop2h 43m

Denver Intl

Mon 25/5

06:00-08:00

Nonstop3h 00m

£234

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 13/6

05:30-13:50

2 stops7h 20m

Denver Intl

Wed 17/6

17:30-23:30

2 stops7h 00m

£248

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 27/6

07:30-17:30

2 stops9h 00m

Denver Intl

Sat 4/7

07:50-16:00

1 stop9h 10m

£251

Flights are sorted by cheapest return flights first.

Deals found on 17/4

Showing 1-10 of 23 resultsSorted by cheapest first
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Best time to book a flight from Seattle to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Seattle 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 Seattle to Denver

How far ahead should I book a flight from Seattle to Denver?

Use this chart to determine the optimal time to book a return flight from Seattle to Denver. Price data was last updated on 10 April 2026.

The price you pay for your flight from Seattle to Denver may vary depending on when you book. For the best chance of a lower fare, look to book 66 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Seattle to Denver?

Currently, January is the cheapest month in which you can book a flight from Seattle to Denver (average of £118). Flying from Seattle to Denver in June is currently the most expensive (average of £192). 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 SEA to DEN?

Find hourly flight availability from Seattle to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 19 April 2026.

One of the essential ways to save on airfare from Seattle to Denver is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 65% on airfare.

How much does it cost for a return flight from Seattle to Denver?

Related info for your journey

Find useful and relevant information for your journey from Seattle to Denver. 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 Seattle to Denver flight route?

    Flights from Seattle/Tacoma Intl to Denver Intl have been viewed 6 times in the past calendar month.

  • How long is the flight from Seattle to Denver?

    Departing from Seattle to Denver will take you 6h 34m. The distance between Seattle and Denver is about 1022 mi. This flight may include one or multiple stops.

  • What are the most reliable airlines from Seattle to Denver?

    No one likes to see their flight delayed. When booking a flight from Seattle to Denver consider choosing Condor (96%), STARLUX Airlines (95%) or Icelandair (92%) as they are the most reliable in getting you off to your destination on time.

  • Can I find deals for flights from Seattle to Denver that include hotel bookings?

    Yes. In addition to deals on Seattle to Denver flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Denver?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Denver.

  • Can I find deals for business class flights from Seattle to Denver?

    Yes. Cheapflights offers flight deals from Seattle to Denver 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 Seattle to Denver?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Denver (average of £118). Flying from Seattle to Denver in June is currently the most expensive (average of £192). 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

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Denver from Seattle.

Can Cheapflights find flights from Seattle to Denver with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Seattle to Denver flexibly with Cheapflights today.

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Of course! You can now track prices for flights from Seattle to Denver and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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