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$39+ Cheap flights from Seattle (SEA) to Colorado

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 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Seattle to Colorado

Cheapest flights from Seattle to Colorado
Explore the most affordable flight options available from Seattle to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/1512:24 pm
SEA
-
DEN
Nonstop2h 51m
Frontier
Mon 3/239:10 am
DEN
-
SEA
Nonstop3h 09m
Frontier
Deal found 1/27$68
This Super.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/612:24 pm
SEA
-
DEN
Nonstop2h 51m
Frontier
Sun 3/89:10 am
DEN
-
SEA
Nonstop3h 09m
Frontier
Deal found 1/27$71
This Cheapflightsfares deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Sat 4/187:15 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Deal found 1/28$72
This Booking.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/1312:24 pm
SEA
-
DEN
Nonstop2h 51m
Frontier
Fri 3/209:10 am
DEN
-
SEA
Nonstop3h 09m
Frontier
Deal found 1/27$73
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/164:20 pm
SEA
-
DEN
Nonstop2h 51m
Frontier
Tue 4/217:15 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Deal found 1/28$76
This Frontier deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Sun 4/1912:51 pm
DEN
-
SEA
Nonstop3h 14m
Frontier
Deal found 1/27$77
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/2212:00 pm
SEA
-
DEN
Nonstop2h 51m
Frontier
Sun 3/18:45 am
DEN
-
SEA
Nonstop3h 10m
Frontier
Deal found 1/27$81
This Frontier deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/261:16 pm
SEA
-
DEN
Nonstop2h 51m
Frontier
Thu 3/129:10 am
DEN
-
SEA
Nonstop3h 09m
Frontier
Deal found 1/29$82
This Cheapflightsfares deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2712:00 pm
SEA
-
DEN
Nonstop2h 50m
Frontier
Sun 3/18:45 am
DEN
-
SEA
Nonstop3h 10m
Frontier
Deal found 1/28$83
This Frontier deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/211:51 pm
SEA
-
DEN
1 stop9h 51m
Frontier
Sat 2/289:52 am
DEN
-
SEA
Nonstop3h 09m
Frontier
Deal found 1/29$87
This Cheapflightsfares deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/16:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Mon 5/412:51 pm
DEN
-
SEA
Nonstop3h 14m
Frontier
Deal found 1/28$88
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/25:30 am
SEA
-
COS
1 stop4h 45m
Delta
Tue 3/108:15 am
COS
-
SEA
1 stop7h 37m
Delta
Deal found 1/28$157

Find flight deals from Seattle to Colorado

Keep the following information in mind while searching for Seattle to Colorado flight deals. Data was last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$68
(Cheapflightsfares)

One-way from

$39
(Kiwi.com)

Popular in

April

Cheapest in

January

Average price

$186

Good round-trip deal

$196 or less

Good one-way deal

$138 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Denver Intl flights.
Search Deals
From Seattle/Tacoma Intl to Colorado
Search Deals
One-way flight from Seattle/Tacoma Intl to Colorado
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($14 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Colorado.
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Colorado.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Colorado 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 2,558,603 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from Seattle to Colorado that are best for you.

Fly from

Seattle

Fly to

Colorado

Route

Depart

Return

Price

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 3/1

8:30 am-12:14 pm

Nonstop2h 44m

Denver Intl

Sat 3/7

7:52 pm-10:00 pm

Nonstop3h 08m

$137

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 3/3

8:15 am-12:15 pm

Nonstop3h 00m

Denver Intl

Sat 3/7

6:50 pm-9:08 pm

Nonstop3h 18m

$137

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 3/15

5:00 am-8:39 am

Nonstop2h 39m

Denver Intl

Sat 3/21

7:14 pm-9:14 pm

Nonstop3h 00m

$137

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 2/18

7:40 pm-11:25 pm

Nonstop2h 45m

Denver Intl

Sun 3/1

6:40 am-8:51 am

Nonstop3h 11m

$137

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 2/25

5:00 am-8:38 am

Nonstop2h 38m

Denver Intl

Wed 3/4

4:02 pm-6:03 pm

Nonstop3h 01m

$137

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 2/24

5:40 pm-9:23 pm

Nonstop2h 43m

Denver Intl

Sat 2/28

7:52 pm-10:00 pm

Nonstop3h 08m

$137

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 2/22

7:40 pm-11:25 pm

Nonstop2h 45m

Denver Intl

Tue 3/3

6:40 am-8:51 am

Nonstop3h 11m

$137

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 2/21

8:14 pm-11:59 pm

Nonstop2h 45m

Denver Intl

Tue 2/24

7:00 am-9:10 am

Nonstop3h 10m

$137

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 4/7

7:46 pm-11:32 pm

Nonstop2h 46m

Denver Intl

Thu 4/9

6:30 am-8:38 am

Nonstop3h 08m

$137

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 2/28

7:40 pm-11:25 pm

Nonstop2h 45m

Denver Intl

Sat 3/7

6:50 pm-9:08 pm

Nonstop3h 18m

$137

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 60 results
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Best time to book a flight from Seattle to Colorado

Have a flexible travel schedule? Discover the best time to fly to Colorado 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 Colorado

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

Currently, January is the cheapest month in which you can book a flight from Seattle to Colorado (average of $37). Flying from Seattle to Colorado in July is currently the most expensive (average of $100). 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 CO?

Find hourly flight availability from Seattle to Colorado. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 29, 2026.

A simple way to save on the total cost of your ticket is to fly from Seattle to Colorado in the evening. If you’re flexible enough to do this you can expect to save up to 45% on your trip compared to booking a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from Seattle to Colorado. Price data was last updated on January 24, 2026.

Travelers seeking maximum savings on their Seattle to Colorado flight should consider departing on Friday 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.

Weekly flight availability from Seattle to Colorado

Explore weekly flight availability from Seattle to Colorado. 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 January 29, 2026.

The most flights from SEA to USCO are scheduled on a Wednesday (33 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (19 on average).

Reviews of airlines servicing Colorado

Get insights into the airlines that provide service to Colorado. 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 Colorado. Reviews last updated January 29, 2026.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta from Seattle to Colorado have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
8.0
Very good
11,808 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Southwest
8.0
Very good
4,267 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Delta
7.9
Good
8,127 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
United Airlines
7.4
Good
9,215 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Frontier
5.7
Fair
3,056 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Colorado. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Colorado?

    For a flight from Seattle to Colorado, you will be flying from Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 11.4 mi from the center of the city.

  • How popular is this Seattle to Colorado flight route?

    The Seattle/Tacoma Intl to Colorado flight path was viewed by 283 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 Colorado?

    There are many flights that can get you from Seattle to Colorado in 2h 39m. Fly via Alaska Airlines, Delta, or United Airlines to get the fastest option. The distance between Seattle and Colorado is about 1022 mi. All flights are typically nonstop.

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

    $29 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on United Airlines and Delta, with prices starting from $59 and $68, respectively.

  • What are the most popular routes from Seattle to Colorado?

    The most popular flight routes from Seattle to Colorado are Seattle/Tacoma Intl - Denver Intl, Seattle/Tacoma Intl - Hayden Yampa Valley and Seattle/Tacoma Intl - Colorado Springs.

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

    The top 3 most reliable airlines when flying from Seattle to Colorado are Aeromexico (100%), SkyWest Airlines (95%) and Virgin Atlantic (94%).

  • What are the cheapest flights from Seattle to Colorado?

    On average you can expect to pay $757 for a flight from Seattle to Colorado. The cheapest flight overall is $58 while the most popular route, (Seattle/Tacoma Intl - Denver Intl) is currently priced at $90.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Seattle to Colorado (average of $37). Flying from Seattle to Colorado in July is currently the most expensive (average of $100). 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.

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Top 7 airlines flying from Seattle to Colorado

Discover the top 7 airlines that operate flights from Seattle to Colorado. 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 2,558,603 searches. Data last updated January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$58Average$164FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$78Average$215FlexibilityNo cancel feeOn-time85%
DeltaCheapest$98Average$260FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$118Average$390FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$118Average$381FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$132Average$471FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$216Average$411FlexibilityNo cancel feeOn-time71%

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