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$37+ 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 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
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 December 15, 2025.

This Priceline deal was found by Cheapflights users on 12/13. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/291:25 pmSEA - DEN
1 stop8h 14mFrontier
Sun 1/189:00 amDEN - SEA
Nonstop3h 09mFrontier
Deal found 12/13$171
This Mytrip deal was found by Cheapflights users on 12/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/211:25 pmSEA - DEN
1 stop8h 14mFrontier
Thu 1/229:10 amDEN - SEA
Nonstop3h 09mFrontier
Deal found 12/14$181
This Expedia deal was found by Cheapflights users on 12/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/262:54 pmSEA - DEN
Nonstop2h 49mMultiple Airlines
Wed 1/712:15 pmDEN - SEA
Nonstop3h 13mMultiple Airlines
Deal found 12/12$198
This Booking.com deal was found by Cheapflights users on 12/13. 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.
Thu 12/181:25 pmSEA - DEN
Nonstop2h 53mFrontier
Sat 1/1712:34 pmDEN - SEA
Nonstop3h 09mFrontier
Deal found 12/13$215
This Priceline deal was found by Cheapflights users on 12/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/311:25 pmSEA - DEN
Nonstop2h 53mFrontier
Mon 1/56:35 amDEN - SEA
1 stop8h 19mFrontier
Deal found 12/15$216
This Cheapflightsfares deal was found by Cheapflights users on 12/12. 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 12/262:54 pmSEA - DEN
Nonstop2h 49mFrontier
Mon 1/510:16 amDEN - SEA
Nonstop3h 14mFrontier
Deal found 12/12$217
This Super.com deal was found by Cheapflights users on 12/13. 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.
Sat 12/272:54 pmSEA - DEN
Nonstop2h 49mFrontier
Sat 1/1011:24 amDEN - SEA
Nonstop3h 10mFrontier
Deal found 12/13$218
This Super.com deal was found by Cheapflights users on 12/13. 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.
Sat 12/272:54 pmSEA - DEN
Nonstop2h 49mFrontier
Mon 1/199:00 amDEN - SEA
Nonstop3h 09mFrontier
Deal found 12/13$221
This Super.com deal was found by Cheapflights users on 12/13. 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.
Sun 12/282:54 pmSEA - DEN
Nonstop2h 49mFrontier
Sat 1/1011:24 amDEN - SEA
Nonstop3h 10mFrontier
Deal found 12/13$222
This Delta deal was found by Cheapflights users on 12/12. 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.
Fri 12/264:57 pmSEA - COS
1 stop4h 28mDelta
Thu 1/812:00 pmCOS - SEA
1 stop7h 29mDelta
Deal found 12/12$278
This Delta deal was found by Cheapflights users on 12/12. 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.
Tue 12/304:57 pmSEA - COS
1 stop4h 28mDelta
Tue 1/1312:00 pmCOS - SEA
1 stop7h 29mDelta
Deal found 12/12$358
This Delta deal was found by Cheapflights users on 12/12. 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.
Thu 12/185:00 pmSEA - GJT
1 stop4h 47mDelta
Sun 12/215:51 amGJT - SEA
1 stop5h 17mDelta
Deal found 12/12$379

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 December 15, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$69
(Super.com)

One-way from

$37
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$246

Good round-trip deal

$214 or less

Good one-way deal

$116 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
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 15, 2025.
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

Wed 1/7

7:40 pm-11:25 pm

Nonstop2h 45m

Denver Intl

Wed 1/14

6:50 pm-9:10 pm

Nonstop3h 20m

$117

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Mon 1/12

7:54 pm-11:35 pm

Nonstop2h 41m

Denver Intl

Thu 1/15

7:00 am-9:11 am

Nonstop3h 11m

$117

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 1/9

7:40 pm-11:25 pm

Nonstop2h 45m

Denver Intl

Tue 1/13

6:50 pm-9:10 pm

Nonstop3h 20m

$117

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Mon 3/9

8:14 pm-11:59 pm

Nonstop2h 45m

Denver Intl

Wed 3/11

7:00 am-9:10 am

Nonstop3h 10m

$117

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 1/29

7:40 pm-11:25 pm

Nonstop2h 45m

Denver Intl

Sat 1/31

6:50 pm-9:10 pm

Nonstop3h 20m

$117

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 1/25

7:40 pm-11:25 pm

Nonstop2h 45m

Denver Intl

Wed 1/28

6:29 am-8:40 am

Nonstop3h 11m

$117

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 1/7

7:40 pm-11:25 pm

Nonstop2h 45m

Denver Intl

Thu 1/8

6:50 pm-9:10 pm

Nonstop3h 20m

$117

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 1/28

7:40 pm-11:25 pm

Nonstop2h 45m

Denver Intl

Wed 2/4

12:30 pm-2:43 pm

Nonstop3h 13m

$117

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 2/19

7:40 pm-11:25 pm

Nonstop2h 45m

Denver Intl

Wed 2/25

12:30 pm-2:41 pm

Nonstop3h 11m

$117

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 2/26

7:40 pm-11:25 pm

Nonstop2h 45m

Denver Intl

Tue 3/3

6:40 am-8:51 am

Nonstop3h 11m

$117

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

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 $36). 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 December 15, 2025.

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 12% 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 December 16, 2024.

Travelers seeking maximum savings on their Seattle to Colorado flight should consider departing on Sunday 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 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 December 15, 2025.

The most flights from SEA to USCO are scheduled on a Sunday (37 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (9 on average).

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

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 December 15, 2025.
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
11,451 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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
11,451 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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
7.9
Good
4,250 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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
8,008 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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.
United Airlines
7.4
Good
9,092 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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
3,080 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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 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 282 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 41m. Fly via Delta, Alaska Airlines, or United Airlines to get the fastest option. The distance between Seattle and Colorado is about 1022 mi. This flight may include one or multiple stops.

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

    $33 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Delta and Alaska Airlines, with prices starting from $68 and $74, 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 - Colorado Springs and Seattle/Tacoma Intl - Vail Eagle County.

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

    The top 3 most reliable airlines when flying from Seattle to Colorado are United Airlines (93%), Copa Airlines (91%) and Icelandair (91%).

  • What are the cheapest flights from Seattle to Colorado?

    On average you can expect to pay $866 for a flight from Seattle to Colorado. The cheapest flight overall is $54 while the most popular route, (Seattle/Tacoma Intl - Denver Intl) is currently priced at $84.

  • 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 $36). 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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Alternative routes for Seattle to Colorado

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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 December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$65Average$167FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$87Average$233FlexibilityNo cancel feeOn-time85%
DeltaCheapest$114Average$282FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$136Average$371FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$148Average$388FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$149Average$478FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$216Average$397FlexibilityNo cancel feeOn-time71%

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