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Cheap flights from Seattle to Denver from C$ 80

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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
22 Nov — 29 Nov1
1 adult
1 adult, Economy, 0 bags

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

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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 23 October 2025.

Thu 6/118:22 p.m.SEA - DEN
1 stop12h 05mFrontier
Sun 9/119:48 a.m.DEN - SEA
Nonstop3h 09mFrontier
Deal found 21/10C$ 139
Tue 16/122:19 p.m.SEA - DEN
Nonstop2h 44mAlaska Airlines
Mon 5/111:31 a.m.DEN - SEA
1 stop5h 30mAlaska Airlines
Deal found 23/10C$ 143
Wed 17/1212:45 p.m.SEA - DEN
1 stop7h 43mAlaska Airlines
Wed 7/18:04 a.m.DEN - SEA
1 stop7h 56mAlaska Airlines
Deal found 23/10C$ 148
Fri 14/117:40 p.m.SEA - DEN
Nonstop2h 47mDelta
Sun 16/116:05 a.m.DEN - SEA
Nonstop3h 08mDelta
Deal found 22/10C$ 153
Thu 11/1212:08 p.m.SEA - DEN
1 stop6h 16mAlaska Airlines
Mon 15/126:59 p.m.DEN - SEA
1 stop6h 13mAlaska Airlines
Deal found 23/10C$ 160
Tue 16/123:15 p.m.SEA - DEN
Nonstop2h 39mDelta
Thu 18/126:05 a.m.DEN - SEA
Nonstop3h 10mDelta
Deal found 23/10C$ 161
Wed 17/1212:45 p.m.SEA - DEN
1 stop7h 43mAlaska Airlines
Mon 5/111:31 a.m.DEN - SEA
1 stop5h 30mAlaska Airlines
Deal found 23/10C$ 165
Tue 11/1111:10 p.m.SEA - DEN
1 stop10h 25mAlaska Airlines
Tue 18/117:00 a.m.DEN - SEA
Nonstop3h 07mAlaska Airlines
Deal found 20/10C$ 167
Tue 16/122:19 p.m.SEA - DEN
Nonstop2h 44mAlaska Airlines
Mon 29/126:02 a.m.DEN - SEA
Nonstop3h 08mAlaska Airlines
Deal found 23/10C$ 169
Sun 14/128:14 p.m.SEA - DEN
Nonstop2h 45mAlaska Airlines
Fri 19/126:02 a.m.DEN - SEA
Nonstop3h 08mAlaska Airlines
Deal found 22/10C$ 171
Fri 28/115:35 a.m.SEA - DEN
Nonstop2h 35mSouthwest
Thu 4/128:55 p.m.DEN - SEA
Nonstop3h 00mSouthwest
Deal found 21/10C$ 172
Sat 6/122:08 p.m.SEA - DEN
1 stop8h 51mAlaska Airlines
Sat 13/1211:41 a.m.DEN - SEA
1 stop6h 54mAlaska Airlines
Deal found 21/10C$ 174

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 23 October 2025.

Round-trip from

C$ 139

One-way from

C$ 80

Popular in

December

Cheapest in

January

Average price

C$ 263

Good round-trip deal

C$ 224 or less

Good one-way deal

C$ 92 or less
Frontier
  • Frontier
  • 6/11-9/11
  • 1 total stop
  • 15h 14m total
  • Seattle to Denver
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 4/12
  • 1 total stop
  • 8h 51m total
  • Seattle to Denver
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Denver Intl.
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Denver Intl.
Search Deals

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 23 October 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

Thu 22/1

2:36 p.m.-11:59 p.m.

1 stop8h 23m

Denver Intl

Sun 25/1

7:00 a.m.-9:11 a.m.

Nonstop3h 11m

C$ 146

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 3/3

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

Nonstop2h 44m

Denver Intl

Wed 4/3

8:20 a.m.-2:26 p.m.

1 stop7h 06m

C$ 146

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Mon 2/3

9:55 a.m.-6:33 p.m.

1 stop7h 38m

Denver Intl

Wed 4/3

12:35 p.m.-2:35 p.m.

Nonstop3h 00m

C$ 146

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 17/12

12:45 p.m.-9:28 p.m.

1 stop7h 43m

Denver Intl

Thu 8/1

8:04 a.m.-3:00 p.m.

1 stop7h 56m

C$ 148

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 1/2

10:28 a.m.-6:41 p.m.

1 stop7h 13m

Denver Intl

Thu 5/2

12:34 p.m.-7:11 p.m.

1 stop7h 37m

C$ 160

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 29/1

2:36 p.m.-11:59 p.m.

1 stop8h 23m

Denver Intl

Mon 2/2

11:49 a.m.-3:44 p.m.

1 stop4h 55m

C$ 160

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 3/2

4:30 p.m.-11:59 p.m.

1 stop6h 29m

C$ 80

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 12/12

2:08 p.m.-11:59 p.m.

1 stop8h 51m

C$ 80

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 18/2

11:25 a.m.-6:33 p.m.

1 stop6h 08m

C$ 80

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 28/2

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

Nonstop2h 42m

C$ 83

Flights are sorted by cheapest round-trip flights first.

Deals found on 22/10

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 17 October 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, January is the cheapest month in which you can book a flight from Seattle to Denver (average of C$ 64). Flying from Seattle to Denver in July is currently the most expensive (average of C$ 154). 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 23 October 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 41% on flights from Seattle to Denver by exploring options for tickets at noon.

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 19 October 2025.

Travelers seeking maximum savings on their Seattle to Denver flight should consider departing on Monday at noon 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.

How much does it cost to fly round-trip from Seattle to Denver?

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 23 October 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
11,156 reviews
Check prices

Food

7.1

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.0

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
11,156 reviews
Alaska Airlines
8.0
Very good
11,156 reviews
Check prices

Food

7.1

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.0

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
4,236 reviews
Alaska Airlines
8.0
Very good
11,156 reviews
Check prices

Food

7.1

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.0

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
7.9
Good
7,981 reviews
Alaska Airlines
8.0
Very good
11,156 reviews
Check prices

Food

7.1

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.0

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
2,789 reviews
Alaska Airlines
8.0
Very good
11,156 reviews
Check prices

Food

7.1

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.0

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
3,128 reviews
Alaska Airlines
8.0
Very good
11,156 reviews
Check prices

Food

7.1

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.0

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 18 flights from Seattle/Tacoma Intl to Denver Intl, all of which are around 2h 42m 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 286 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 8h 23m. Fly via Alaska Airlines to get the fastest option. There are 1645 km between Seattle and Denver.

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

    According to our current data, Frontier (C$ 61), Delta (C$ 109), and Southwest (C$ 117) offers the cheapest pricing from Seattle to Denver. Users have found that Frontier is 79% 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: Aeromexico (88%), LATAM Airlines (88%), United Airlines( 87%).

  • 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$ 265, our data indicates the cheapest price to be C$ 54. The most popular route (Seattle/Tacoma Intl - Denver Intl), is priced around C$ 154.

  • 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, January is the cheapest month in which you can book a flight from Seattle to Denver (average of C$ 64). Flying from Seattle to Denver in July is currently the most expensive (average of C$ 154). 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 23 October 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapestC$ 61AverageC$ 197FlexibilityNo cancel feeOn-time62%
Search Frontier flights
DeltaCheapestC$ 109AverageC$ 241FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
SouthwestCheapestC$ 117AverageC$ 221FlexibilityNo cancel feeOn-time63%
Search Southwest flights
Hawaiian AirlinesCheapestC$ 181AverageC$ 290FlexibilityNo cancel feeOn-time85%
Search Hawaiian Airlines flights
Alaska AirlinesCheapestC$ 219AverageC$ 326FlexibilityNo cancel feeOn-time75%
Search Alaska 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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