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Cheap flights from Seattle to Denver from C$ 109

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 25/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
19 Aug — 26 Aug1
1 adult

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Denver Intl are usually found in October or September, booked 77 days in advance, depart on a Monday or Friday and return on a Saturday

Cheap 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 14 August 2025.

Round-trip from

C$ 159

One-way from

C$ 109

Popular in

December

Cheapest in

October

Average price

C$ 296

Good round-trip deal

C$ 276 or less

Good one-way deal

C$ 135 or less
Frontier
  • Frontier
  • 20/9-23/9
  • Nonstop
  • 5h 57m total
  • Seattle to Denver
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Southwest
  • Southwest
  • 25/10
  • Nonstop
  • 2h 35m total
  • Seattle to Denver
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High demand for flights, 1% potential price rise
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Cheapest flight prices on average. 2% potential price decrease (C$ 9 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Denver Intl.
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Denver Intl.
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Find flight deals from Seattle to Denver

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 14 August 2025.

Sat 20/97:00 a.m.SEA - DEN
Nonstop2h 53mFrontier
Tue 23/98:55 p.m.DEN - SEA
Nonstop3h 04mFrontier
Deal found 13/8C$ 159
Fri 17/104:11 p.m.SEA - DEN
1 stop6h 35mFrontier
Sun 19/105:43 p.m.DEN - SEA
Nonstop3h 05mFrontier
Deal found 13/8C$ 161
Sat 25/108:43 p.m.SEA - DEN
Nonstop2h 52mFrontier
Mon 27/108:15 a.m.DEN - SEA
1 stop6h 11mFrontier
Deal found 14/8C$ 163
Sat 20/97:00 a.m.SEA - DEN
Nonstop2h 53mFrontier
Mon 22/910:29 p.m.DEN - SEA
Nonstop3h 01mFrontier
Deal found 13/8C$ 181
Sat 25/108:00 a.m.SEA - DEN
Nonstop2h 53mMultiple Airlines
Mon 27/105:30 a.m.DEN - SEA
Nonstop3h 03mMultiple Airlines
Deal found 14/8C$ 204
Wed 5/118:37 a.m.SEA - DEN
Nonstop2h 50mAlaska Airlines
Wed 5/113:37 p.m.DEN - SEA
Nonstop3h 08mAlaska Airlines
Deal found 14/8C$ 208
Sat 20/97:00 a.m.SEA - DEN
Nonstop2h 53mMultiple Airlines
Tue 23/911:40 a.m.DEN - SEA
1 stop7h 10mMultiple Airlines
Deal found 13/8C$ 215

Cheapflights Fare Finder

 
Customize 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 629,999 searches. Data last updated 14 August 2025.
Use the filters below to find and compare flights from Seattle to Denver that are best for you.

Fly from

Seattle

Fly to

Denver

Route

Depart

Return

Price

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 20/9

7:00 a.m.-10:53 a.m.

Nonstop2h 53m

Denver Intl

Tue 23/9

8:55 p.m.-10:59 p.m.

Nonstop3h 04m

C$ 159

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 25/10

8:43 p.m.-12:35 a.m.

Nonstop2h 52m

Denver Intl

Mon 27/10

8:15 a.m.-1:26 p.m.

1 stop6h 11m

C$ 163

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 20/9

7:00 a.m.-10:53 a.m.

Nonstop2h 53m

Denver Intl

Mon 22/9

10:29 p.m.-12:30 a.m.

Nonstop3h 01m

C$ 181

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 25/10

1:35 p.m.-5:21 p.m.

Nonstop2h 46m

Denver Intl

Mon 27/10

5:30 a.m.-7:33 a.m.

Nonstop3h 03m

C$ 204

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 5/11

8:37 a.m.-12:27 p.m.

Nonstop2h 50m

Denver Intl

Wed 5/11

3:37 p.m.-5:45 p.m.

Nonstop3h 08m

C$ 208

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 16/9

6:00 p.m.-9:42 p.m.

Nonstop2h 42m

Denver Intl

Tue 23/9

7:49 p.m.-10:01 p.m.

Nonstop3h 12m

C$ 216

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 4/11

8:37 a.m.-12:27 p.m.

Nonstop2h 50m

Denver Intl

Tue 4/11

8:02 p.m.-10:13 p.m.

Nonstop3h 11m

C$ 216

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 1/11

5:20 a.m.-10:35 a.m.

1 stop4h 15m

Denver Intl

Sat 1/11

1:23 p.m.-3:26 p.m.

Nonstop3h 03m

C$ 222

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 19/11

7:35 a.m.-11:28 a.m.

Nonstop2h 53m

C$ 109

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 11/10

5:00 a.m.-8:42 a.m.

Nonstop2h 42m

C$ 109

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/8

Showing 1-10 of 17 results
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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 round-trip 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 round-trip flight from Seattle to Denver. Price data was last updated on 8 August 2025.

The best time to book flights from Seattle to Denver is 77 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, August is the cheapest month in which you can book a flight from Seattle to Denver (average of C$ 320). Flying from Seattle to Denver in December is currently the most expensive (average of C$ 484). 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 14 August 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 42% on flights from Seattle to Denver by exploring options for tickets in the evening.

What is the cheapest day to fly from Seattle to Denver?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Denver. Price data was last updated on 10 August 2025.

Travelers seeking maximum savings on their Seattle to Denver flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Seattle to Denver

Explore weekly flight availability from Seattle to Denver. 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 14 August 2025.

The most flights from SEA to DEN are scheduled on a Thursday (56 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (23 on average).

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated 14 August 2025.
Read through reviews of airlines operating flights from Seattle to Denver, such as Alaska Airlines,Southwest, andDelta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,244 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,916 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Frontier
5.8
Fair
3,217 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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.

  • What airports do I use to fly from Seattle to Denver?

    Booking a flight from Seattle/Tacoma Intl (SEA) to Denver Intl (DEN) is your only option if you wish to fly from Seattle to Denver. On a typical day, there are 40 flights from Seattle/Tacoma Intl to Denver Intl, all of which are around 2h 47m for a nonstop flight. You can also purchase a plane ticket from 5 airlines when you book a flight from Seattle/Tacoma Intl to Denver.

  • How popular is this Seattle to Denver flight route?

    This flight path from Seattle/Tacoma Intl to Denver Intl was viewed by 302 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 Seattle to Denver round-trip?

    According to our current data, Frontier (C$ 74), Delta (C$ 108), and Alaska Airlines (C$ 160) offers the cheapest pricing from Seattle to Denver. Users have found that Frontier is 74% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Seattle to Denver one-way?

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as C$ 109. However, be on the lookout for offers from Hawaiian Airlines and Frontier, as they are both options that can get you from Seattle to Denver for a low price.

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

    Before booking your flight to Denver from Seattle, check out the most reliable airlines to get you to your destination on time: ANA (81%), SWISS (77%), United Airlines( 77%).

  • What are the cheapest flights from Seattle to Denver?

    Looking for the cheapest flight from Seattle to Denver? While on average our users pay C$ 264, our data indicates the cheapest price to be C$ 99. The most popular route (Seattle/Tacoma Intl - Denver Intl), is priced around C$ 176.

  • 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 vacation 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, August is the cheapest month in which you can book a flight from Seattle to Denver (average of C$ 320). Flying from Seattle to Denver in December is currently the most expensive (average of C$ 484). 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
Golden
Westminster
Thornton

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Alternative routes for Seattle to Denver

See prices for flight routes from nearby airports that may be better suited for you.
Bellingham to Denver flights

Top 5 airlines flying from Seattle to Denver

Discover the top 5 airlines that operate flights from Seattle to Denver. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 14 August 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapestC$ 74AverageC$ 190FlexibilityNo cancel feeOn-time62%
Search Frontier flights
DeltaCheapestC$ 108AverageC$ 237FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 160AverageC$ 319FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
SouthwestCheapestC$ 193AverageC$ 272FlexibilityNo cancel feeOn-time63%
Search Southwest flights
United AirlinesCheapestC$ 218AverageC$ 340FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Denver?

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

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Denver for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Yes! Cheapflights helps users easily find flights from Seattle to Denver with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Denver become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Denver from Seattle today and book when prices fit your budget.

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