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Cheap flights from Seattle to Denver from C$ 105

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 28/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
17 Oct — 24 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Denver Intl are usually found in October or November, 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 17 September 2025.

Round-trip from

C$ 138

One-way from

C$ 105

Popular in

December

Cheapest in

October

Average price

C$ 260

Good round-trip deal

C$ 309 or less

Good one-way deal

C$ 301 or less
Frontier
  • Frontier
  • 17/10-19/10
  • Nonstop
  • 5h 55m total
  • Seattle to Denver
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Southwest
  • Southwest
  • 28/10
  • 1 total stop
  • 8h 05m total
  • Seattle to Denver
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High demand for flights, 0% 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 September 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 17 September 2025.

Fri 17/108:43 p.m.SEA - DEN
Nonstop2h 52mFrontier
Sun 19/105:30 a.m.DEN - SEA
Nonstop3h 03mFrontier
Deal found 16/9C$ 138
Wed 15/108:43 p.m.SEA - DEN
Nonstop2h 52mFrontier
Sun 19/108:38 a.m.DEN - SEA
1 stop11h 05mFrontier
Deal found 15/9C$ 151
Wed 8/108:43 p.m.SEA - DEN
Nonstop2h 52mFrontier
Wed 15/1012:10 p.m.DEN - SEA
1 stop28h 06mFrontier
Deal found 15/9C$ 154
Mon 3/112:06 p.m.SEA - DEN
Nonstop2h 44mHawaiian Airlines
Mon 3/118:02 p.m.DEN - SEA
Nonstop3h 11mHawaiian Airlines
Deal found 16/9C$ 175
Tue 7/107:35 a.m.SEA - DEN
Nonstop2h 53mDelta
Sat 11/107:41 p.m.DEN - SEA
Nonstop3h 04mDelta
Deal found 16/9C$ 183
Mon 3/1112:41 p.m.SEA - DEN
1 stop8h 14mUnited Airlines
Sat 8/115:55 p.m.DEN - SEA
1 stop6h 20mUnited Airlines
Deal found 16/9C$ 198
Fri 31/1012:35 p.m.SEA - DEN
Nonstop2h 35mSouthwest
Sun 2/1110:35 p.m.DEN - SEA
Nonstop3h 00mSouthwest
Deal found 16/9C$ 199
Sat 25/106:15 a.m.SEA - DEN
2 stops8h 15mSouthwest
Tue 28/108:05 a.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 16/9C$ 204

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 17 September 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

Fri 31/10

7:30 p.m.-11:14 p.m.

Nonstop2h 44m

Denver Intl

Sun 2/11

5:25 a.m.-7:31 a.m.

Nonstop3h 06m

C$ 183

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 29/1

7:40 p.m.-11:22 p.m.

Nonstop2h 42m

Denver Intl

Sun 1/2

6:15 a.m.-8:24 a.m.

Nonstop3h 09m

C$ 183

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 30/1

11:25 a.m.-7:14 p.m.

1 stop6h 49m

Denver Intl

Wed 4/2

12:45 p.m.-5:00 p.m.

1 stop5h 15m

C$ 210

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 5/11

5:25 a.m.-11:47 a.m.

1 stop5h 22m

Denver Intl

Wed 5/11

6:23 p.m.-11:59 p.m.

1 stop6h 36m

C$ 210

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 28/2

3:35 p.m.-7:19 p.m.

Nonstop2h 44m

Denver Intl

Wed 4/3

5:15 p.m.-7:15 p.m.

Nonstop3h 00m

C$ 243

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 3/3

7:40 p.m.-11:22 p.m.

Nonstop2h 42m

Denver Intl

Wed 4/3

6:15 a.m.-8:24 a.m.

Nonstop3h 09m

C$ 243

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 30/10

9:55 a.m.-7:30 p.m.

2 stops8h 35m

Denver Intl

Sun 2/11

10:35 p.m.-12:35 a.m.

Nonstop3h 00m

C$ 245

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 3/12

8:10 a.m.-6:00 p.m.

2 stops8h 50m

Denver Intl

Sat 6/12

7:40 a.m.-9:45 a.m.

Nonstop3h 05m

C$ 250

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 15/10

7:30 p.m.-11:14 p.m.

Nonstop2h 44m

Denver Intl

Sun 19/10

6:25 a.m.-8:31 a.m.

Nonstop3h 06m

C$ 254

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 3/1

8:17 p.m.-11:59 p.m.

Nonstop2h 42m

Denver Intl

Sat 10/1

12:30 p.m.-5:36 p.m.

1 stop6h 06m

C$ 257

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/9

Showing 1-10 of 23 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 12 September 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 17 September 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 40% 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 14 September 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. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 17 September 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

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Southwest
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
8.0
Very good
7,961 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Hawaiian Airlines
7.8
Good
2,729 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Frontier
5.8
Fair
3,173 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

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 35 flights from Seattle/Tacoma Intl to Denver Intl, all of which are around 2h 44m for a nonstop flight. You can also purchase a plane ticket from 6 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 300 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 Seattle to Denver?

    There are many flights that can get you from Seattle to Denver in 2h 44m. Fly via Delta to get the fastest option. There are 1645 km between Seattle and Denver. All flights are typically direct.

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

    According to our current data, Frontier (C$ 62), Delta (C$ 108), and Southwest (C$ 115) offers the cheapest pricing from Seattle to Denver. Users have found that Frontier is 78% cheaper than the other options available to this destination.

  • 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 (82%), China Airlines (82%), United Airlines( 79%).

  • 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$ 449, our data indicates the cheapest price to be C$ 115. The most popular route (Seattle/Tacoma Intl - Denver Intl), is priced around C$ 183.

  • 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 6 airlines flying from Seattle to Denver

Discover the top 6 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 17 September 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapestC$ 62AverageC$ 193FlexibilityNo cancel feeOn-time62%
Search Frontier flights
DeltaCheapestC$ 108AverageC$ 237FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
SouthwestCheapestC$ 115AverageC$ 217FlexibilityNo cancel feeOn-time63%
Search Southwest flights
Alaska AirlinesCheapestC$ 160AverageC$ 318FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapestC$ 176AverageC$ 331FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Hawaiian AirlinesCheapestC$ 210AverageC$ 293FlexibilityNo cancel feeOn-time85%
Search Hawaiian Airlines flights

Fly with Cheapflights

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

Cheapflights helps you search for flights from Seattle to Denver via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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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