What airlines fly to Colorado?

Frontier, United Airlines and Alaska Airlines are the top three most popular airlines that fly to Colorado from Seattle according to our data. Frontier is the first choice among our users, with 40% of people opting to fly with this airline when traveling to Colorado. Keep in mind that there are 8 different airlines that fly to Colorado on a routine basis, so you have a few additional options to choose from.

How many flights depart from Seattle to Colorado on average per day?

26 flights are operational daily from Seattle to Colorado as of May 2026. The most popular departure time for this route is 1:00PM, with 43% of flights per day taking off in the afternoon.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Colorado?

United Airlines, Delta, and Southwest are the most popular carriers operating from Seattle/Tacoma Intl to Colorado

How many flights depart from Seattle to Colorado on average per week?

The number of flights available between Seattle and Colorado is 187 per week as of May 2026. The most frequent departure day is Tue, with 20% of weekly flights leaving on this day.

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

Prices for flights from Seattle/Tacoma Intl Airport to Colorado refresh daily.

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

There are 8 operators available for flights from Seattle/Tacoma Intl Airport to Colorado as of May 2026.

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

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 Seattle/Tacoma Intl Airport to Colorado.

What documentation or ID do you need to fly to Colorado?

The necessary travel and health documents for your Colorado trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$109 Cheap Flights from Seattle to Colorado in 2026

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Seattle to Colorado

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:05 am - 5:40 pm

SEA

COS

5h 35m

1 stop

6:16 pm - 10:00 pm

COS

SEA

4h 44m

1 stop

$217Delta

Fri, Jul 3 - Sat, Jul 11

7:15 am - 5:38 pm

SEA

COS

9h 23m

2 stops

6:16 pm - 11:59 pm

COS

SEA

6h 43m

1 stop

$222Delta

Sat, Jul 4 - Wed, Jul 8

9:16 pm - 3:52 am

SEA

DEN

5h 36m

1 stop

7:30 am - 1:00 pm

DEN

SEA

6h 30m

1 stop

$225Frontier

Tue, Sep 29 - Wed, Sep 30

9:16 pm - 3:52 am

SEA

DEN

5h 36m

1 stop

7:45 am - 9:51 am

DEN

SEA

3h 06mnonstop

$227Frontier

Tue, Oct 13 - Wed, Oct 14

8:12 pm - 9:42 pm

SEA

DEN

24h 30m

1 stop

7:25 am - 5:51 pm

DEN

SEA

11h 26m

1 stop

$228Frontier

Wed, Jul 1 - Wed, Jul 8

5:20 pm - 1:20 am

SEA

COS

7h 00m

1 stop

5:10 pm - 11:10 pm

COS

SEA

7h 00m

2 stops

$271Southwest

Fri, Jul 3 - Tue, Jul 7

5:00 am - 12:28 pm

SEA

HDN

6h 28m

1 stop

3:10 pm - 9:15 pm

HDN

SEA

7h 05m

1 stop

$317United Airlines

Sat, Sep 12 - Wed, Sep 16

5:00 am - 12:28 pm

SEA

HDN

6h 28m

1 stop

1:30 pm - 9:51 pm

HDN

SEA

9h 21m

2 stops

$322United Airlines

Sat, Sep 12 - Wed, Sep 16

9:20 am - 6:25 pm

SEA

HDN

8h 05m

2 stops

8:45 am - 5:55 pm

HDN

SEA

10h 10m

2 stops

$350Southwest

Sat, Sep 12 - Wed, Sep 16

9:18 pm - 5:23 pm

SEA

ASE

19h 05m

1 stop

4:30 pm - 10:58 pm

ASE

SEA

7h 28m

1 stop

$399Alaska Airlines

Thu, Jul 9 - Mon, Jul 13

Frontier flights from Seattle to Colorado

Our best Frontier deals on Seattle to Colorado flight tickets

Frontier

Jul 1

SEA8:12 pmSeattle/Tacoma Intl

14h 07m

1 stop

DEN11:19 amDenver Intl

Jul 8

DEN12:47 pmDenver Intl

22h 52m

1 stop

SEA10:39 amSeattle/Tacoma Intl

$228

Frontier

Jun 23

SEA11:53 amSeattle/Tacoma Intl

20h 33m

1 stop

DEN9:26 amDenver Intl

Jun 30

DEN8:44 amDenver Intl

11h 13m

1 stop

SEA6:57 pmSeattle/Tacoma Intl

$229

Frontier

Aug 12

SEA8:13 pmSeattle/Tacoma Intl

6h 43m

1 stop

DEN3:56 amDenver Intl

Aug 19

DEN8:44 amDenver Intl

11h 14m

1 stop

SEA6:58 pmSeattle/Tacoma Intl

$230

Delta flights from Seattle to Colorado

Our best Delta deals on Seattle to Colorado flight tickets

Delta

Jul 3

SEA11:05 amSeattle/Tacoma Intl

5h 35m

1 stop

COS5:40 pmColorado Springs

Jul 11

COS6:16 pmColorado Springs

4h 44m

1 stop

SEA10:00 pmSeattle/Tacoma Intl

$217

Delta

Jul 4

SEA7:15 amSeattle/Tacoma Intl

9h 23m

2 stops

COS5:38 pmColorado Springs

Jul 8

COS6:16 pmColorado Springs

6h 43m

1 stop

SEA11:59 pmSeattle/Tacoma Intl

$222

Delta

Oct 31

SEA11:25 amSeattle/Tacoma Intl

4h 49m

1 stop

COS5:14 pmColorado Springs

Nov 14

COS5:55 pmColorado Springs

7h 16m

1 stop

SEA12:11 amSeattle/Tacoma Intl

$248

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleColorado Springs

SEA - COS

SEACOS

Seattle/Tacoma Intl

Fri 7/3

11:05 am-5:40 pm

1 stop5h 35m

Colorado Springs

Sat 7/11

6:16 pm-10:00 pm

1 stop4h 44m

$217

SeattleColorado Springs

SEA - COS

SEACOS

Seattle/Tacoma Intl

Sat 7/4

7:15 am-5:38 pm

2 stops9h 23m

Colorado Springs

Wed 7/8

6:16 pm-11:59 pm

1 stop6h 43m

$222

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 9/29

9:16 pm-3:52 am

1 stop5h 36m

Denver Intl

Wed 9/30

7:30 am-1:00 pm

1 stop6h 30m

$225

Quickest round-trip

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 10/13

9:16 pm-3:52 am

1 stop5h 36m

Denver Intl

Wed 10/14

7:45 am-9:51 am

Nonstop3h 06m

$227

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 7/1

8:12 pm-9:42 pm

1 stop24h 30m

Denver Intl

Wed 7/8

7:25 am-5:51 pm

1 stop11h 26m

$228

SeattleColorado Springs

SEA - COS

SEACOS

Seattle/Tacoma Intl

Fri 7/3

5:20 pm-1:20 am

1 stop7h 00m

Colorado Springs

Tue 7/7

5:10 pm-11:10 pm

2 stops7h 00m

$271

SeattleHayden

SEA - HDN

SEAHDN

Seattle/Tacoma Intl

Sat 9/12

5:00 am-12:28 pm

1 stop6h 28m

Hayden Yampa Valley

Wed 9/16

3:10 pm-9:15 pm

1 stop7h 05m

$317

SeattleHayden

SEA - HDN

SEAHDN

Seattle/Tacoma Intl

Sat 9/12

5:00 am-12:28 pm

1 stop6h 28m

Hayden Yampa Valley

Wed 9/16

1:30 pm-9:51 pm

2 stops9h 21m

$322

SeattleHayden

SEA - HDN

SEAHDN

Seattle/Tacoma Intl

Sat 9/12

9:20 am-6:25 pm

2 stops8h 05m

Hayden Yampa Valley

Wed 9/16

8:45 am-5:55 pm

2 stops10h 10m

$350

SeattleAspen

SEA - ASE

SEAASE

Seattle/Tacoma Intl

Thu 7/9

9:18 pm-5:23 pm

1 stop19h 05m

Aspen Pitkin County

Mon 7/13

4:30 pm-10:58 pm

1 stop7h 28m

$399

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Seattle to Colorado

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

Prices

Airlines

Other information

What is the cheapest month to fly to Colorado?

The month of October is, on average, the cheapest month to fly to Colorado from Seattle, with most prices found around $244. The month of August is another great option to travel to Colorado, with average flight prices from Seattle averaging around $255.

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

The cheapest day to depart from Seattle to Colorado is on a Friday when prices can be found for as low as $283. On the other hand, Sunday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $351.

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

The cheapest time of day to fly to Colorado is in the evening when flights can be purchased for as low as $251. In the morning is when there is more demand to fly to Colorado, so prices are often more expensive at around $336 per ticket.

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

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

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

You are more likely to see cheaper flights to Colorado from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Colorado for around $221 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Colorado from Seattle for as low as $179 on momondo.

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

There are 4 cabin classes available to choose from on Seattle to Colorado 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 Seattle to Colorado flights?

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

Cheap Seattle to Colorado flight deals and tips

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

Best Price Found	$146
Fastest flight time	2h 45m
Direct flights	Every day
Airports in Colorado	87 airports

The best one-way flight to Colorado from Seattle in the past 72 hours is $146. The best round-trip flight deal from Seattle to Colorado found on momondo in the last 72 hours is $264.

The fastest flight from Seattle to Colorado takes 2h 45m

Direct flights go from Seattle to Colorado every day.

There are 87 airports in Colorado. From Seattle there are direct flights to Denver Intl (DEN).

Search flight deals

Frequently asked questions about flying from Seattle to Colorado

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Colorado?
Prices for flights from Seattle/Tacoma Intl Airport to Colorado refresh daily.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Colorado?
There are 8 operators available for flights from Seattle/Tacoma Intl Airport to Colorado as of May 2026.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Colorado?
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 Seattle/Tacoma Intl Airport to Colorado.
What documentation or ID do you need to fly to Colorado?
The necessary travel and health documents for your Colorado trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Seattle to Colorado?
Based on momondo bookings for flights between Seattle and Colorado, the leading plane model is Airbus A321neo, making up 18.73% of the total bookings. Other popular models include Boeing 737 MAX 8 with 18.28%, Boeing 737-800 with 13.67%, and Boeing 737-800 Passenger/BBJ2 (winglets) with 10.49%.

Best airlines flying from Seattle to Colorado

Compare and see reviews for airlines that fly from Seattle to Colorado with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $56	Free Cancellation	Rating 5.6 2,933 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $69	Free Cancellation	Rating 7.8 2,835 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $91	Free Cancellation	Rating 7.9 8,424 reviews	Search Delta flights
Southwest	PriceFrom $117	Free Cancellation	Rating 7.9 4,265 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $117	Free Cancellation	Rating 7.9 12,419 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom $130	Free Cancellation	Rating 7.4 9,753 reviews	Search United Airlines flights
JetBlue	PriceFrom $200	Free Cancellation	Rating 7.1 2,982 reviews	Search JetBlue flights
American Airlines	PriceFrom $216	Free Cancellation	Rating 7.1 11,641 reviews	Search American Airlines flights

Why use momondo?

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

Finding the right flight to Colorado from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Colorado quick and easy, saving you time and money.

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

Yes. All flights to Colorado from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential Seattle to Colorado flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes momondo offers price alerts on flights to Colorado from Seattle. 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.

An easier way to manage your Colorado trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Fri 6/26

Fri 7/3

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Colorado

Popular cities

Other flights from Seattle

Other flights to Colorado

Airlines

Complete your trip

Feeling lucky

Popular cities in Colorado

Flights to New Yorkfrom $77

Flights to Los Angelesfrom $65

Flights to Orlandofrom $68

Flights to Miamifrom $71

Flights to Chicagofrom $61

Flights to San Franciscofrom $66

Flights to Las Vegasfrom $50

Flights to Washington, D.C.from $57

Flights to Bostonfrom $79

Flights to Atlantafrom $51

Flights to Fort Lauderdalefrom $57

Flights to Dallasfrom $104

Cheap flights from Seattle to Colorado from $109

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Colorado 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.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Seattle to Colorado

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Frontier flights from Seattle to Colorado

Our best Frontier deals on Seattle to Colorado flight tickets

Delta flights from Seattle to Colorado

Our best Delta deals on Seattle to Colorado flight tickets

momondo Fare Finder

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

See travel insights to Colorado from

How to get the cheapest flight ticket from Seattle to Colorado

What is the cheapest month to fly to Colorado?

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

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

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

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

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

Can stopping save me money on Seattle to Colorado flights?

What is the cheapest airline that flies from Seattle/Tacoma Intl to Colorado?

What airlines fly to Colorado?

How many flights depart from Seattle to Colorado on average per day?

How many flights depart from Seattle to Colorado on average per week?

Cheap Seattle to Colorado flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Colorado

Frequently asked questions about flying from Seattle to Colorado

Best airlines flying from Seattle to Colorado

Compare and see reviews for airlines that fly from Seattle to Colorado with momondo

Why use momondo?

An easier way to manage your Colorado trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Colorado

Popular cities in Colorado

Popular flights according to clicks in the last 7 days on momondo

Seattle flight routes

According to popular flight searches on momondo this year

Colorado flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Colorado

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Complete your trip to Colorado

Explore popular destinations other users love

According to popular flight searches on momondo this year