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$78+ 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 4/19. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
abr. 2 — abr. 91
mié. 4/2
mié. 4/9
1 adult, Economy
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Cheap flight deals from Colorado to Seattle

Keep the following information in mind while searching for Colorado to Seattle flight deals. Data was last updated marzo 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$115
(Cheapflightsfares)

One-way from

$78
(Cheapflightsfares)

Popular in

July

Cheapest in

September

Average price

$202

Good round-trip deal

$222 or less

Good one-way deal

$116 or less
Provider with most accurate pricing for Denver Intl-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Denver Intl-Seattle/Tacoma Intl flights.
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From Colorado to Seattle/Tacoma Intl
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One-way flight from Colorado to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 5% potential increase in price ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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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 marzo 28, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 3/27. 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.
vie. 4/2510:37 pmDEN - SEA
Nonstop3h 07mFrontier
lun. 4/286:00 amSEA - DEN
Nonstop2h 46mFrontier
Deal found 3/27$115
This Expedia deal was found by Cheapflights users on 3/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 4/2610:37 pmDEN - SEA
Nonstop3h 07mMultiple Airlines
mar. 4/295:30 amSEA - DEN
1 stop4h 51mMultiple Airlines
Deal found 3/27$143
This United Airlines deal was found by Cheapflights users on 3/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/67:46 amDEN - SEA
Nonstop3h 01mUnited Airlines
mié. 5/147:00 amSEA - DEN
1 stop6h 59mUnited Airlines
Deal found 3/27$163
This Southwest deal was found by Cheapflights users on 3/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/38:45 pmDEN - SEA
Nonstop3h 00mSouthwest
mar. 5/139:15 amSEA - DEN
1 stop8h 15mSouthwest
Deal found 3/27$167
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/232:39 pmDEN - SEA
Nonstop2h 56mAlaska Airlines
mié. 4/238:20 pmSEA - DEN
Nonstop2h 39mAlaska Airlines
Deal found 3/27$191
This Hawaiian Airlines deal was found by Cheapflights users on 3/27. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/168:01 pmDEN - SEA
Nonstop2h 59mHawaiian Airlines
lun. 5/198:23 pmSEA - DEN
Nonstop2h 42mHawaiian Airlines
Deal found 3/27$197
This Delta deal was found by Cheapflights users on 3/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/57:50 pmDEN - SEA
Nonstop3h 06mDelta
mar. 9/91:30 pmSEA - DEN
Nonstop2h 55mDelta
Deal found 3/27$217
This American Airlines deal was found by Cheapflights users on 3/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/234:39 pmCOS - SEA
1 stop7h 25mAmerican Airlines
sáb. 4/265:22 amSEA - COS
1 stop9h 27mAmerican Airlines
Deal found 3/27$217
This United Airlines deal was found by Cheapflights users on 3/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/306:39 pmCOS - SEA
1 stop5h 21mUnited Airlines
lun. 5/122:40 pmSEA - COS
2 stops8h 11mUnited Airlines
Deal found 3/27$222
This American Airlines deal was found by Cheapflights users on 3/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 6/74:30 pmDRO - SEA
1 stop9h 14mAmerican Airlines
mar. 6/105:40 pmSEA - DRO
1 stop5h 28mAmerican Airlines
Deal found 3/27$259
This American Airlines deal was found by Cheapflights users on 3/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/35:00 amGJT - SEA
1 stop6h 54mAmerican Airlines
sáb. 5/1011:40 amSEA - GJT
1 stop5h 19mAmerican Airlines
Deal found 3/27$289
This United Airlines deal was found by Cheapflights users on 3/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/35:30 amGJT - SEA
2 stops11h 28mUnited Airlines
sáb. 5/105:15 amSEA - GJT
1 stop4h 38mUnited Airlines
Deal found 3/27$294

Cheapflights Fare Finder

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 marzo 28, 2025.
Use the filters below to find and compare flights from Colorado to Seattle that are best for you.

Fly from

Colorado

Fly to

Seattle

Route

Depart

Return

Price

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

vie. 4/25

10:37 pm-12:44 am

Nonstop3h 07m

Seattle/Tacoma Intl

lun. 4/28

6:00 am-9:46 am

Nonstop2h 46m

$115

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

sáb. 5/10

10:36 pm-12:44 am

Nonstop3h 08m

Seattle/Tacoma Intl

mié. 5/21

8:23 pm-12:05 am

Nonstop2h 42m

$134

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

mar. 5/6

7:46 am-9:47 am

Nonstop3h 01m

Seattle/Tacoma Intl

mié. 5/14

7:00 am-2:59 pm

1 stop6h 59m

$163

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

sáb. 4/26

7:00 am-9:00 am

Nonstop3h 00m

Seattle/Tacoma Intl

mar. 4/29

5:30 am-11:21 am

1 stop4h 51m

$167

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

sáb. 5/3

8:45 pm-10:45 pm

Nonstop3h 00m

Seattle/Tacoma Intl

sáb. 5/10

10:10 am-8:35 pm

2 stops9h 25m

$172

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

mié. 6/18

6:30 am-8:29 am

Nonstop2h 59m

Seattle/Tacoma Intl

mié. 6/25

6:00 pm-9:44 pm

Nonstop2h 44m

$197

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

mar. 4/22

8:20 am-12:29 pm

1 stop5h 09m

Seattle/Tacoma Intl

mar. 4/29

5:30 am-11:21 am

1 stop4h 51m

$216

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

mié. 4/23

4:39 pm-11:04 pm

1 stop7h 25m

Seattle/Tacoma Intl

sáb. 4/26

5:22 am-3:49 pm

1 stop9h 27m

$217

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

mié. 4/30

6:39 pm-11:00 pm

1 stop5h 21m

Seattle/Tacoma Intl

lun. 5/12

2:40 pm-11:51 pm

2 stops8h 11m

$222

DurangoSeattle

DRO - SEA

DROSEA

Durango La Plata County

sáb. 6/7

4:30 pm-12:44 am

1 stop9h 14m

Seattle/Tacoma Intl

mar. 6/10

5:40 pm-12:08 am

1 stop5h 28m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 50 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.

Cheapflights Insights

Everything you need to know about your flight from Colorado to Seattle

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 marzo 28, 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 marzo 28, 2025.

The most flights from USCO to SEA are scheduled on a Thursday (39 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (8 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 marzo 28, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines and Delta 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
4,274 reviews

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,274 reviews
Southwest
8.1
Very good
4,274 reviews

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Alaska Airlines
8.0
Very good
9,798 reviews
Southwest
8.1
Very good
4,274 reviews

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,897 reviews
Southwest
8.1
Very good
4,274 reviews

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Hawaiian Airlines
7.9
Good
2,336 reviews
Southwest
8.1
Very good
4,274 reviews

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very good
4,274 reviews

Comfort

8.1

Crew

8.7

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 233 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 $78. Alaska Airlines flights start at $79 while deals on United Airlines start at $84 one-way.

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

    Most travelers choose Denver Intl - Seattle/Tacoma Intl, Grand Junction Regnl - Seattle/Tacoma Intl or Colorado Springs - 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: Japan Airlines (92%), KLM (91%), Korean Air (90%).

  • What are the cheapest flights from Colorado to Seattle?

    While on average a flight from Colorado to Seattle is generally $1,281, our data shows the cheapest flight currently is $68. When looking at the most popular route, (Denver Intl - Seattle/Tacoma Intl), you can expect to pay $134 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
Tacoma
Lakewood
Renton
Lacey
Ocean Shores
Leavenworth
Federal Way
Olympia
Cle Elum
Centralia
Mukilteo
Aberdeen
Shoreline
Lynnwood
Shelton
Silverdale
Redmond
Monroe

Browse thousands of different options on Cheapflights for your next trip

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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 7 airlines flying from Colorado to Seattle

Discover the top 7 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 marzo 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$57Average$139FlexibilityNo cancel feeOn-time62%
DeltaCheapest$101Average$381FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$108Average$253FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$118Average$354FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$138Average$381FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$147Average$507FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$206Average$426FlexibilityNo cancel feeOn-time71%
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