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$57+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
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Cheap flight deals from Seattle to Colorado

Keep the following information in mind while searching for Seattle to Colorado flight deals. Data was last updated septiembre 11, 2025.

Round-trip from

$98
(Trip.com)

One-way from

$57
(Southwest)

Popular in

December

Cheapest in

October

Average price

$173

Good round-trip deal

$175 or less

Good one-way deal

$137 or less
From Seattle/Tacoma Intl to Colorado
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One-way flight from Seattle/Tacoma Intl to Colorado
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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 ($5 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 Colorado.
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Colorado.
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Find 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 septiembre 11, 2025.

This Trip.com deal was found by Cheapflights users on 9/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/248:43 pmSEA - DEN
Nonstop2h 52mMultiple Airlines
sáb. 10/256:20 pmDEN - SEA
Nonstop3h 01mMultiple Airlines
Deal found 9/9$98
This Trip.com deal was found by Cheapflights users on 9/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/215:59 pmSEA - DEN
Nonstop2h 47mMultiple Airlines
vie. 10/245:30 amDEN - SEA
Nonstop3h 03mMultiple Airlines
Deal found 9/10$99
This Trip.com deal was found by Cheapflights users on 9/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/301:18 pmSEA - DEN
Nonstop2h 53mFrontier
mié. 11/510:00 amDEN - SEA
Nonstop3h 13mFrontier
Deal found 9/9$100
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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.
vie. 10/312:22 pmSEA - DEN
Nonstop2h 51mFrontier
lun. 11/36:00 amDEN - SEA
1 stop9h 16mFrontier
Deal found 9/10$101
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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.
vie. 10/36:12 amSEA - DEN
Nonstop2h 56mFrontier
dom. 10/56:00 amDEN - SEA
1 stop7h 25mFrontier
Deal found 9/10$102
This Mytrip deal was found by Cheapflights users on 9/10. 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.
dom. 10/264:11 pmSEA - DEN
1 stop14h 53mFrontier
jue. 10/3010:00 amDEN - SEA
Nonstop3h 13mFrontier
Deal found 9/10$103
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
vie. 10/36:12 amSEA - DEN
Nonstop2h 56mFrontier
vie. 10/105:30 amDEN - SEA
Nonstop3h 03mFrontier
Deal found 9/9$104
This Cheapflightsfares deal was found by Cheapflights users on 9/9. 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.
mié. 9/247:00 amSEA - DEN
Nonstop2h 53mFrontier
mar. 9/308:55 pmDEN - SEA
Nonstop3h 04mFrontier
Deal found 9/9$105
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
jue. 10/301:18 pmSEA - DEN
Nonstop2h 53mFrontier
dom. 11/25:00 amDEN - SEA
1 stop8h 37mFrontier
Deal found 9/9$106
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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.
lun. 10/64:36 pmSEA - DEN
1 stop5h 50mFrontier
jue. 10/99:58 amDEN - SEA
Nonstop3h 09mFrontier
Deal found 9/10$107
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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.
sáb. 10/188:43 pmSEA - DEN
Nonstop2h 52mFrontier
vie. 10/245:30 amDEN - SEA
Nonstop3h 03mFrontier
Deal found 9/10$108
This Frontier deal was found by Cheapflights users on 9/9. 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.
vie. 10/178:43 pmSEA - DEN
Nonstop2h 52mFrontier
dom. 10/198:15 amDEN - SEA
1 stop6h 11mFrontier
Deal found 9/9$109

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 septiembre 11, 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

mié. 10/29

1:20 pm-11:50 pm

2 stops9h 30m

Denver Intl

mié. 11/12

8:55 pm-10:55 pm

Nonstop3h 00m

$109

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

mié. 11/5

12:58 pm-4:57 pm

Nonstop2h 59m

Denver Intl

mié. 11/5

10:29 pm-6:32 pm

1 stop21h 03m

$110

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

vie. 10/10

4:11 pm-11:44 pm

1 stop6h 33m

Denver Intl

vie. 10/17

5:30 am-7:33 am

Nonstop3h 03m

$111

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

sáb. 10/11

6:15 am-3:30 pm

2 stops8h 15m

Denver Intl

mar. 10/14

9:50 pm-11:45 pm

Nonstop2h 55m

$115

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

mié. 11/5

10:54 am-2:41 pm

Nonstop2h 47m

Denver Intl

mié. 11/5

8:02 pm-10:13 pm

Nonstop3h 11m

$127

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

mar. 10/7

9:15 am-6:10 pm

1 stop7h 55m

Denver Intl

mar. 10/7

9:50 pm-11:45 pm

Nonstop2h 55m

$129

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

sáb. 11/1

7:30 pm-11:14 pm

Nonstop2h 44m

Denver Intl

sáb. 11/8

6:25 am-8:31 am

Nonstop3h 06m

$133

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

mié. 11/5

7:35 am-11:28 am

Nonstop2h 53m

Denver Intl

mié. 11/5

7:41 pm-9:45 pm

Nonstop3h 04m

$133

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

jue. 10/30

1:18 pm-5:11 pm

Nonstop2h 53m

Denver Intl

mié. 11/5

10:00 am-12:13 pm

Nonstop3h 13m

$134

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

mié. 10/29

1:20 pm-11:50 pm

2 stops9h 30m

Denver Intl

lun. 11/3

8:55 pm-10:55 pm

Nonstop3h 00m

$134

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

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, October is the cheapest month in which you can book a flight from Seattle to Colorado (average of $197). Flying from Seattle to Colorado in March is currently the most expensive (average of $278). 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 septiembre 11, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Colorado as you normally would.

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 septiembre 11, 2025.

The most flights from SEA to USCO are scheduled on a Thursday (46 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 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 septiembre 11, 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
10,000 reviews

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

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

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

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
4,248 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

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
7,960 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

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
8,937 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

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
3,177 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

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 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 301 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 47m. Fly via Southwest, Frontier, or Hawaiian 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?

    $69 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on United Airlines and American Airlines, with prices starting from $77 and $87, 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 - Durango La Plata County.

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

    The top 3 most reliable airlines when flying from Seattle to Colorado are China Airlines (80%), ANA (79%) and United Airlines (76%).

  • What are the cheapest flights from Seattle to Colorado?

    On average you can expect to pay $706 for a flight from Seattle to Colorado. The cheapest flight overall is $79 while the most popular route, (Seattle/Tacoma Intl - Denver Intl) is currently priced at $63.

  • 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, October is the cheapest month in which you can book a flight from Seattle to Colorado (average of $197). Flying from Seattle to Colorado in March is currently the most expensive (average of $278). 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

See prices for flight routes from nearby airports that may be better suited for you.
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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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$66Average$161FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$86Average$233FlexibilityNo cancel feeOn-time85%
DeltaCheapest$115Average$316FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$128Average$371FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$149Average$485FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$167Average$405FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$169Average$407FlexibilityNo cancel feeOn-time71%

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