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Cheap flights from Colorado to Seattle from $52

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Colorado to Seattle departing on 4/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Colorado to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
9:10 am - 11:19 am
DEN
-
SEA
3h 09mnonstop
Frontier Logo
12:24 pm - 4:15 pm
SEA
-
DEN
2h 51mnonstop
$71Frontier
Fri, Mar 6 - Mon, Mar 16
Frontier Logo
9:52 am - 12:01 pm
DEN
-
SEA
3h 09mnonstop
Frontier Logo
12:24 pm - 4:15 pm
SEA
-
DEN
2h 51mnonstop
$72Frontier
Thu, Mar 5 - Sun, Mar 8
Southwest Logo
8:55 pm - 1:40 am
COS
-
SEA
5h 45m
1 stop
Southwest Logo
3:45 pm - 12:20 am
SEA
-
COS
7h 35m
1 stop
$197Southwest
Fri, Mar 6 - Mon, Mar 9
Delta Logo
7:55 am - 2:44 pm
COS
-
SEA
7h 49m
1 stop
Delta Logo
11:45 am - 10:05 pm
SEA
-
COS
9h 20m
2 stops
$202Delta
Tue, Mar 3 - Tue, Mar 10
Delta Logo
12:00 pm - 6:29 pm
COS
-
SEA
7h 29m
1 stop
Delta Logo
4:55 pm - 10:05 pm
SEA
-
COS
4h 10m
1 stop
$207Delta
Fri, Mar 6 - Tue, Mar 10
United Airlines Logo
3:33 pm - 9:12 pm
MTJ
-
SEA
6h 39m
1 stop
United Airlines Logo
5:00 am - 12:32 pm
SEA
-
MTJ
6h 32m
1 stop
$211United Airlines
Fri, Feb 27 - Fri, Mar 6
United Airlines Logo
6:20 pm - 10:59 pm
GJT
-
SEA
5h 39m
1 stop
United Airlines Logo
3:30 pm - 10:22 pm
SEA
-
GJT
5h 52m
1 stop
$211United Airlines
Thu, Mar 5 - Tue, Mar 10
American Airlines Logo
4:49 pm - 11:07 pm
COS
-
SEA
7h 18m
1 stop
American Airlines Logo
5:30 am - 3:58 pm
SEA
-
COS
9h 28m
1 stop
$217American Airlines
Thu, Mar 5 - Mon, Mar 9
American Airlines Logo
3:25 pm - 11:43 pm
COS
-
SEA
9h 18m
1 stop
American Airlines Logo
5:05 am - 2:35 pm
SEA
-
COS
8h 30m
1 stop
$239American Airlines
Wed, Jul 22 - Wed, Jul 29
Southwest Logo
8:55 pm - 1:40 am
COS
-
SEA
5h 45m
1 stop
Southwest Logo
2:50 pm - 10:05 pm
SEA
-
COS
6h 15m
1 stop
$256Southwest
Fri, Mar 13 - Sat, Mar 21

Frontier flights from Colorado to Seattle

Our best Frontier deals on Colorado to Seattle flight tickets
Frontier
Mar 6
DEN9:10 amDenver Intl
3h 09m
SEA11:19 amSeattle/Tacoma Intl
Mar 16
SEA12:24 pmSeattle/Tacoma Intl
2h 51m
DEN4:15 pmDenver Intl
$71
Frontier
Mar 5
DEN9:52 amDenver Intl
3h 09m
SEA12:01 pmSeattle/Tacoma Intl
Mar 8
SEA12:24 pmSeattle/Tacoma Intl
2h 51m
DEN4:15 pmDenver Intl
$72
Frontier
Apr 4
DEN9:25 amDenver Intl
3h 12m
SEA11:37 amSeattle/Tacoma Intl
Apr 14
SEA6:57 pmSeattle/Tacoma Intl
2h 52m
DEN10:49 pmDenver Intl
$74

American Airlines flights from Colorado to Seattle

Our best American Airlines deals on Colorado to Seattle flight tickets
American Airlines
Mar 5
COS4:49 pmColorado Springs
7h 18m
1 stop
SEA11:07 pmSeattle/Tacoma Intl
Mar 9
SEA5:30 amSeattle/Tacoma Intl
9h 28m
1 stop
COS3:58 pmColorado Springs
$217
American Airlines
Jul 22
COS3:25 pmColorado Springs
9h 18m
1 stop
SEA11:43 pmSeattle/Tacoma Intl
Jul 29
SEA5:05 amSeattle/Tacoma Intl
8h 30m
1 stop
COS2:35 pmColorado Springs
$239
American Airlines
Feb 28
GJT7:18 amGrand Junction Regnl
7h 24m
1 stop
SEA1:42 pmSeattle/Tacoma Intl
Mar 3
SEA12:59 amSeattle/Tacoma Intl
8h 06m
1 stop
GJT10:05 amGrand Junction Regnl
$245

momondo 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, momondo users made 832,500 searches. Data last updated February 3, 2026.
Use the filters below to find and compare flights from Colorado to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 3/6

9:10 am-11:19 am

Nonstop3h 09m

Seattle/Tacoma Intl

Mon 3/16

12:24 pm-4:15 pm

Nonstop2h 51m

$71

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 3/5

9:52 am-12:01 pm

Nonstop3h 09m

Seattle/Tacoma Intl

Sun 3/8

12:24 pm-4:15 pm

Nonstop2h 51m

$72

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Fri 3/6

8:55 pm-1:40 am

1 stop5h 45m

Seattle/Tacoma Intl

Mon 3/9

3:45 pm-12:20 am

1 stop7h 35m

$197

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Tue 3/3

7:55 am-2:44 pm

1 stop7h 49m

Seattle/Tacoma Intl

Tue 3/10

11:45 am-10:05 pm

2 stops9h 20m

$202

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Fri 3/6

12:00 pm-6:29 pm

1 stop7h 29m

Seattle/Tacoma Intl

Tue 3/10

4:55 pm-10:05 pm

1 stop4h 10m

$207

MontroseSeattle

MTJ - SEA

MTJSEA

Montrose County

Fri 2/27

3:33 pm-9:12 pm

1 stop6h 39m

Seattle/Tacoma Intl

Fri 3/6

5:00 am-12:32 pm

1 stop6h 32m

$211

Grand JunctionSeattle

GJT - SEA

GJTSEA

Grand Junction Regnl

Thu 3/5

6:20 pm-10:59 pm

1 stop5h 39m

Seattle/Tacoma Intl

Tue 3/10

3:30 pm-10:22 pm

1 stop5h 52m

$211

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Thu 3/5

4:49 pm-11:07 pm

1 stop7h 18m

Seattle/Tacoma Intl

Mon 3/9

5:30 am-3:58 pm

1 stop9h 28m

$217

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Wed 7/22

3:25 pm-11:43 pm

1 stop9h 18m

Seattle/Tacoma Intl

Wed 7/29

5:05 am-2:35 pm

1 stop8h 30m

$239

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Fri 3/13

8:55 pm-1:40 am

1 stop5h 45m

Seattle/Tacoma Intl

Sat 3/21

2:50 pm-10:05 pm

1 stop6h 15m

$256

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Colorado to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Seattle?

In general, February is the cheapest month to fly from Colorado to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $167. If you don’t want to visit Seattle in February, then you should wait until January to fly from Colorado, when ticket prices are also cheap, with an average price of $177.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Colorado is on a Thursday. momondo users have found tickets for Thursday departures for as low as $288. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Colorado because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $454.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Colorado in the evening is the least expensive time of day to depart. momondo users have found prices as low as $274 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $376. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Colorado to Seattle/Tacoma Intl flight route?

Fly from Denver Intl to Seattle/Tacoma Intl for the best Colorado - Seattle/Tacoma Intl flight prices

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from Colorado when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $211 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Colorado for as low as $178 on momondo.

What cabin class options are available on Colorado to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on Colorado to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Colorado to Seattle flights?

No. A direct flight is the cheapest option for a flight between Colorado to Seattle.

Cheap Colorado to Seattle flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Colorado to Seattle

Best Price Found

$134

Fastest flight time

2h 59m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Colorado in the past 72 hours is $134. The best round-trip flight deal from Colorado to Seattle found on momondo in the last 72 hours is $188.
The fastest flight from Colorado to Seattle takes 2h 59m
Direct flights go from Colorado to Seattle every day.
There is 1 airport in Seattle. From Colorado there are direct flights to Seattle/Tacoma Intl (SEA).
Search flight deals

  • When did momondo last update prices for flights from Colorado to Seattle/Tacoma Intl Airport?

    Prices for flights from Colorado to Seattle/Tacoma Intl Airport were last updated today.

  • How many operators does momondo search for flights from Colorado to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Colorado to Seattle/Tacoma Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Colorado to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Colorado to Seattle?

Best airlines flying from Colorado to Seattle

Compare and see reviews for airlines that fly from Colorado to Seattle with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $57Free CancellationRating
5.7
3,051 reviews
Search Frontier flights
DeltaPriceFrom $97Free CancellationRating
7.9
8,138 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $108Free CancellationRating
7.8
2,831 reviews
Search Hawaiian Airlines flights
SouthwestPriceFrom $117Free CancellationRating
8.0
4,272 reviews
Search Southwest flights
United AirlinesPriceFrom $117Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $129Free CancellationRating
8.0
11,834 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $186Free CancellationRating
7.2
11,218 reviews
Search American Airlines flights

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Marysville
Redmond
Puyallup
Cle Elum
Tukwila
Lakewood
Federal Way
Westport
Kirkland
Centralia
Fife
Tumwater

Why use momondo?

Why should I use momondo to find a flight deal from Colorado to Seattle?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Colorado to Seattle for you.

Can I find flights from Colorado to Seattle with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Colorado to Seattle flights to just show those with flexible booking policies.

How can momondo help me find flights from Colorado to Seattle?

Once you have performed a search for Colorado to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Colorado to Seattle right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Seattle from Colorado. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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