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

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 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Jan 26 — Feb 21
Sun 1/26
Sun 2/2
1 adult, Economy
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Cheap flight deals from Colorado to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Colorado (USCO) to Seattle (SEA). 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 January 21, 2025.

Round-trip from

$92
(Cheapflightsfares)

One-way from

$39
(Expedia)

Good round-trip deal

$227 or less

Good one-way deal

$155 or less
From Colorado to Seattle/Tacoma Intl
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One-way flight from Colorado to Seattle/Tacoma Intl
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Price to beat on a round-trip flight from Colorado to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from Colorado to Seattle/Tacoma Intl.
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Find flight deals from Colorado to Seattle

Cheapest flights from Colorado to Seattle
Explore the most affordable flight options available from Colorado to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 1/21. 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 2/2110:30 amDEN - SEA
Nonstop3h 06mFrontier
Mon 2/243:16 pmSEA - DEN
Nonstop2h 47mFrontier
Deal found 1/21$92
This Travelocity deal was found by Cheapflights users on 1/20. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/110:40 amDEN - SEA
Nonstop3h 06mMultiple Airlines
Wed 3/55:42 pmSEA - DEN
Nonstop2h 38mMultiple Airlines
Deal found 1/20$103
This Delta deal was found by Cheapflights users on 1/21. 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.
Wed 3/127:50 pmDEN - SEA
Nonstop3h 13mDelta
Mon 3/177:55 pmSEA - DEN
Nonstop2h 53mDelta
Deal found 1/21$117
This United Airlines deal was found by Cheapflights users on 1/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/179:00 pmDEN - SEA
Nonstop3h 01mUnited Airlines
Thu 3/205:14 amSEA - DEN
Nonstop2h 42mUnited Airlines
Deal found 1/21$133
This Southwest deal was found by Cheapflights users on 1/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/19:45 pmDEN - SEA
Nonstop3h 00mSouthwest
Wed 3/510:10 amSEA - DEN
2 stops7h 15mSouthwest
Deal found 1/21$182
This Alaska Airlines deal was found by Cheapflights users on 1/20. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/167:57 pmDEN - SEA
Nonstop3h 02mAlaska Airlines
Thu 4/243:17 pmSEA - DEN
Nonstop2h 40mAlaska Airlines
Deal found 1/20$187
This American Airlines deal was found by Cheapflights users on 1/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/284:50 pmCOS - SEA
1 stop9h 06mAmerican Airlines
Sun 3/212:59 amSEA - COS
1 stop7h 56mAmerican Airlines
Deal found 1/20$188
This United Airlines deal was found by Cheapflights users on 1/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/105:15 pmCOS - SEA
1 stop6h 54mUnited Airlines
Wed 2/1212:35 pmSEA - COS
1 stop4h 18mUnited Airlines
Deal found 1/20$203
This American Airlines deal was found by Cheapflights users on 1/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/112:11 pmDEN - SEA
1 stop5h 53mAmerican Airlines
Wed 3/56:30 amSEA - DEN
1 stop7h 57mAmerican Airlines
Deal found 1/20$208
This Southwest deal was found by Cheapflights users on 1/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/134:45 pmHDN - SEA
1 stop9h 05mSouthwest
Mon 3/175:00 amSEA - HDN
1 stop6h 15mSouthwest
Deal found 1/21$257
This Delta deal was found by Cheapflights users on 1/20. 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.
Wed 2/198:20 amCOS - SEA
2 stops9h 39mDelta
Wed 2/261:30 pmSEA - COS
1 stop4h 20mDelta
Deal found 1/20$273
This United Airlines deal was found by Cheapflights users on 1/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/51:40 pmHDN - SEA
1 stop5h 35mUnited Airlines
Sun 2/99:20 amSEA - HDN
2 stops9h 58mUnited Airlines
Deal found 1/21$274

Find flights from Colorado to Seattle within your budget

Customize your flight search to find flights from Colorado to Seattle 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 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 2/21

10:30 am-12:36 pm

Nonstop3h 06m

Seattle/Tacoma Intl

Mon 2/24

3:16 pm-7:03 pm

Nonstop2h 47m

$92

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 3/1

10:40 am-12:46 pm

Nonstop3h 06m

Seattle/Tacoma Intl

Wed 3/5

5:42 pm-9:20 pm

Nonstop2h 38m

$103

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 3/12

7:50 pm-10:03 pm

Nonstop3h 13m

Seattle/Tacoma Intl

Mon 3/17

7:55 pm-11:48 pm

Nonstop2h 53m

$117

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 3/17

9:00 pm-11:01 pm

Nonstop3h 01m

Seattle/Tacoma Intl

Thu 3/20

5:14 am-8:56 am

Nonstop2h 42m

$133

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 3/1

9:45 pm-11:45 pm

Nonstop3h 00m

Seattle/Tacoma Intl

Wed 3/5

10:10 am-6:25 pm

2 stops7h 15m

$182

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Fri 2/28

4:50 pm-12:56 am

1 stop9h 06m

Seattle/Tacoma Intl

Sun 3/2

12:59 am-9:55 am

1 stop7h 56m

$188

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Mon 2/10

5:15 pm-11:09 pm

1 stop6h 54m

Seattle/Tacoma Intl

Wed 2/12

12:35 pm-5:53 pm

1 stop4h 18m

$203

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 3/1

12:11 pm-5:04 pm

1 stop5h 53m

Seattle/Tacoma Intl

Wed 3/5

6:30 am-3:27 pm

1 stop7h 57m

$208

HaydenSeattle

HDN - SEA

HDNSEA

Hayden Yampa Valley

Thu 3/13

4:45 pm-12:50 am

1 stop9h 05m

Seattle/Tacoma Intl

Mon 3/17

5:00 am-12:15 pm

1 stop6h 15m

$257

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Wed 2/19

8:20 am-4:59 pm

2 stops9h 39m

Seattle/Tacoma Intl

Wed 2/26

1:30 pm-6:50 pm

1 stop4h 20m

$273

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 52 results
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Best time to book a flight from Colorado to Seattle

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

Travel insights for flights from Colorado to Seattle

Get recent, data-driven insights about flights from Colorado to Seattle including ideal travel times, pricing trends, and more.

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

Currently, January is the cheapest month in which you can book a flight from Colorado to Seattle (average of $238). Flying from Colorado to Seattle in July is currently the most expensive (average of $411). 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 CO to SEA?

Find hourly flight availability from Colorado to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 21, 2025.

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

Weekly flight availability from Colorado to Seattle

Explore weekly flight availability from Colorado to Seattle. 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 21, 2025.

The most flights from USCO to SEA are scheduled on a Monday (30 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated January 21, 2025.
Peruse reviews from past customers who have flown with Frontier, Delta and Southwest from Colorado to Seattle to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,662 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,662 reviews
Southwest
8.1
Very good
4,662 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,706 reviews
Southwest
8.1
Very good
4,662 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,521 reviews
Southwest
8.1
Very good
4,662 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,985 reviews
Southwest
8.1
Very good
4,662 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,662 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Related info for your journey

Find useful and relevant information for your journey from Colorado to Seattle. 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 into for flights to Seattle from Colorado?

    Seattle/Tacoma Intl (SEA) is the airport you will fly into if you book a flight from Colorado to Seattle. It is only a 11.4 mi journey from Seattle/Tacoma Intl (SEA) to Seattle’s city center.

  • How popular is this Colorado to Seattle flight route?

    This flight path from Colorado to Seattle/Tacoma Intl was viewed by 220 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $39. United Airlines flights start at $74 while deals on American Airlines start at $80 one-way.

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

    Most travelers choose Denver Intl - Seattle/Tacoma Intl, Colorado Springs - Seattle/Tacoma Intl or Grand Junction Regnl - Seattle/Tacoma Intl when deciding on the best route from Colorado to Seattle.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Colorado to Seattle on time: Aeromexico (100%), Condor (93%), STARLUX Airlines (93%).

  • What are the cheapest flights from Colorado to Seattle?

    While on average a flight from Colorado to Seattle is generally $914, our data shows the cheapest flight currently is $79. When looking at the most popular route, (Denver Intl - Seattle/Tacoma Intl), you can expect to pay $75 for that flight.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Colorado to Seattle (average of $238). Flying from Colorado to Seattle in July is currently the most expensive (average of $411). 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

Traveling to a place near Colorado?

Book flights to Colorado if you plan to visit one of these locations
SeaTac
Tukwila
Renton
Tacoma
Lacey
Federal Way
Ocean Shores
Leavenworth
Olympia
Marysville
Centralia
Cle Elum
Mukilteo
Aberdeen
Lakewood
Issaquah
Shoreline
Lynnwood
Shelton
Silverdale

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Alternative routes for Colorado to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Colorado to Seattle

Discover the top 6 airlines that operate flights from Colorado to Seattle. 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 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$56Average$129FlexibilityNo cancel feeOn-time62%
DeltaCheapest$89Average$383FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$129Average$379FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$129Average$346FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$136Average$510FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$206Average$429FlexibilityNo cancel feeOn-time71%
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