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Cheap flights from Colorado to Seattle from $72

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 9/29. 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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Cheap round-trip flights

Frontier Logo
6:33 pm - 8:39 pmDEN-SEA
3h 06mnonstop
Frontier Logo
8:43 pm - 12:35 amSEA-DEN
2h 52mnonstop
$105Frontier
Find Deal
sáb., oct. 4 - mié., oct. 8
Frontier Logo
5:30 am - 7:33 amDEN-SEA
3h 03mnonstop
Frontier Logo
8:43 pm - 12:35 amSEA-DEN
2h 52mnonstop
$106Frontier
Find Deal
vie., oct. 24 - dom., oct. 26
Delta Logo
5:49 pm - 10:22 pmCOS-SEA
5h 33m1 stop
Delta Logo
1:30 pm - 10:10 pmSEA-COS
7h 40m1 stop
$177Delta
Find Deal
sáb., oct. 25 - mié., oct. 29
Delta Logo
5:49 pm - 10:22 pmCOS-SEA
5h 33m1 stop
Delta Logo
12:45 pm - 10:10 pmSEA-COS
8h 25m2 stops
$182Delta
Find Deal
sáb., oct. 25 - mié., oct. 29
Southwest Logo
2:35 pm - 8:55 pmCOS-SEA
7h 20m1 stop
Southwest Logo
7:00 am - 1:40 pmSEA-COS
5h 40m1 stop
$197Southwest
Find Deal
mar., sep. 23 - mar., sep. 30
United Airlines Logo
3:15 pm - 9:22 pmHDN-SEA
7h 07m1 stop
United Airlines Logo
5:02 am - 12:21 pmSEA-HDN
6h 19m1 stop
$211United Airlines
Find Deal
vie., sep. 19 - lun., sep. 22
United Airlines Logo
6:00 am - 9:57 amCOS-SEA
4h 57m1 stop
United Airlines Logo
3:28 pm - 11:52 pmSEA-COS
7h 24m2 stops
$222United Airlines
Find Deal
mié., sep. 24 - mié., oct. 1
American Airlines Logo
4:54 pm - 11:42 pmDRO-SEA
7h 48m1 stop
American Airlines Logo
10:39 am - 9:26 pmSEA-DRO
9h 47m1 stop
$238American Airlines
Find Deal
vie., nov. 7 - mar., nov. 11
American Airlines Logo
8:00 am - 4:54 pmASE-SEA
9h 54m1 stop
American Airlines Logo
10:32 am - 6:59 pmSEA-ASE
7h 27m1 stop
$249American Airlines
Find Deal
sáb., oct. 18 - mié., oct. 22
Southwest Logo
6:00 am - 2:10 pmCOS-SEA
9h 10m2 stops
Southwest Logo
5:15 am - 10:40 amSEA-COS
4h 25m1 stop
$269Southwest
Find Deal
mar., sep. 23 - mar., sep. 30

Frontier flights from Colorado to Seattle

Our best Frontier deals on Colorado to Seattle flight tickets
Frontier
Oct 4
DEN6:33 pmDenver Intl
3h 06m
SEA8:39 pmSeattle/Tacoma Intl
Oct 8
SEA8:43 pmSeattle/Tacoma Intl
2h 52m
DEN12:35 amDenver Intl
$105
Find similar
Frontier
Oct 24
DEN5:30 amDenver Intl
3h 03m
SEA7:33 amSeattle/Tacoma Intl
Oct 26
SEA8:43 pmSeattle/Tacoma Intl
2h 52m
DEN12:35 amDenver Intl
$106
Find similar
Frontier
Sep 25
DEN10:29 pmDenver Intl
3h 01m
SEA12:30 amSeattle/Tacoma Intl
Oct 3
SEA6:12 amSeattle/Tacoma Intl
2h 56m
DEN10:08 amDenver Intl
$109
Find similar

American Airlines flights from Colorado to Seattle

Our best American Airlines deals on Colorado to Seattle flight tickets
American Airlines
Nov 7
DRO4:54 pmDurango La Plata County
7h 48m
1 stop
SEA11:42 pmSeattle/Tacoma Intl
Nov 11
SEA10:39 amSeattle/Tacoma Intl
9h 47m
1 stop
DRO9:26 pmDurango La Plata County
$238
Find similar
American Airlines
Oct 18
ASE8:00 amAspen Pitkin County
9h 54m
1 stop
SEA4:54 pmSeattle/Tacoma Intl
Oct 22
SEA10:32 amSeattle/Tacoma Intl
7h 27m
1 stop
ASE6:59 pmAspen Pitkin County
$249
Find similar
American Airlines
Oct 9
COS4:54 pmColorado Springs
7h 05m
1 stop
SEA10:59 pmSeattle/Tacoma Intl
Oct 14
SEA11:24 pmSeattle/Tacoma Intl
9h 22m
1 stop
COS9:46 amColorado Springs
$253
Find similar

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 agosto 28, 2025.
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

sáb. 10/4

6:33 pm-8:39 pm

Nonstop3h 06m

Seattle/Tacoma Intl

mié. 10/8

8:43 pm-12:35 am

Nonstop2h 52m

$105

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

vie. 10/24

5:30 am-7:33 am

Nonstop3h 03m

Seattle/Tacoma Intl

dom. 10/26

8:43 pm-12:35 am

Nonstop2h 52m

$106

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

sáb. 10/25

5:49 pm-10:22 pm

1 stop5h 33m

Seattle/Tacoma Intl

mié. 10/29

1:30 pm-10:10 pm

1 stop7h 40m

$177

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

sáb. 10/25

5:49 pm-10:22 pm

1 stop5h 33m

Seattle/Tacoma Intl

mié. 10/29

12:45 pm-10:10 pm

2 stops8h 25m

$182

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

mar. 9/23

2:35 pm-8:55 pm

1 stop7h 20m

Seattle/Tacoma Intl

mar. 9/30

7:00 am-1:40 pm

1 stop5h 40m

$197

HaydenSeattle

HDN - SEA

HDNSEA

Hayden Yampa Valley

vie. 9/19

3:15 pm-9:22 pm

1 stop7h 07m

Seattle/Tacoma Intl

lun. 9/22

5:02 am-12:21 pm

1 stop6h 19m

$211

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

mié. 9/24

6:00 am-9:57 am

1 stop4h 57m

Seattle/Tacoma Intl

mié. 10/1

3:28 pm-11:52 pm

2 stops7h 24m

$222

DurangoSeattle

DRO - SEA

DROSEA

Durango La Plata County

vie. 11/7

4:54 pm-11:42 pm

1 stop7h 48m

Seattle/Tacoma Intl

mar. 11/11

10:39 am-9:26 pm

1 stop9h 47m

$238

AspenSeattle

ASE - SEA

ASESEA

Aspen Pitkin County

sáb. 10/18

8:00 am-4:54 pm

1 stop9h 54m

Seattle/Tacoma Intl

mié. 10/22

10:32 am-6:59 pm

1 stop7h 27m

$249

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

mar. 9/23

6:00 am-2:10 pm

2 stops9h 10m

Seattle/Tacoma Intl

mar. 9/30

5:15 am-10:40 am

1 stop4h 25m

$269

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, October 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 $170. If you don’t want to visit Seattle in October, then you should wait until September to fly from Colorado, when ticket prices are also cheap, with an average price of $175.

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 $450.

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

Flying to Seattle from Colorado in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $270 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $388. 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 $210 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 $180 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.

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

$127

Fastest flight time

2h 54m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Colorado in the past 72 hours is $127. The best round-trip flight deal from Colorado to Seattle found on momondo in the last 72 hours is $173.
The fastest flight from Colorado to Seattle takes 2h 54m
Direct flights go from Colorado to Seattle every day.
There is 1 airport near Seattle: 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 $61Free CancellationRating
5.8
3,204 reviews
Search Frontier flights
DeltaPriceFrom $109Free CancellationRating
7.9
7,977 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $110Free CancellationRating
7.8
2,690 reviews
Search Hawaiian Airlines flights
SouthwestPriceFrom $136Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
United AirlinesPriceFrom $148Free CancellationRating
7.4
8,944 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $157Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $186Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

Traveling to a place near Seattle?

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

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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