$66 Find Cheap Flights from Seattle to Colorado

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Colorado departing on 5/21. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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KAYAK searches hundreds of travel sites at once for deals on flights to Colorado

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Colorado.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Colorado.
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Flights Deals

Best Colorado Flight Deals from Seattle

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Denver
Denvernonstop$132
Aspen
Aspen1 stop$309
Vail
Vail1 stop$329
Grand Junction
Grand Junction1 stop$269
Durango
Durango1 stop$259
Montrose
Montrose2 stops$302
Hayden
Hayden1 stop$257
Gunnison
Gunnison1 stop$344
Denver
Denvernonstop$132
Aspen
Aspen1 stop$309
Vail
Vail1 stop$329
Grand Junction
Grand Junction1 stop$269
Durango
Durango1 stop$259
Montrose
Montrose2 stops$302
Hayden
Hayden1 stop$257
Gunnison
Gunnison1 stop$344

Cheap Flights from Seattle to Colorado

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Colorado that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Seattle to Colorado

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Seattle to Colorado.
Discover the best prices for you by selecting your travel dates on KAYAK.
Frontier Logo
6:00 am - 9:51 amSEA-DEN
2h 51mnonstop
Frontier Logo
9:43 pm - 11:49 pmDEN-SEA
3h 06mnonstop
$132Frontier
Find Deal
Tue, May 13 - Tue, May 13
Frontier Logo
6:00 am - 9:51 amSEA-DEN
2h 51mnonstop
Frontier Logo
9:43 pm - 11:49 pmDEN-SEA
3h 06mnonstop
$133Frontier
Find Deal
Tue, May 13 - Tue, May 20
Delta Logo
7:10 am - 11:00 amSEA-DEN
2h 50mnonstop
Delta Logo
1:45 pm - 3:43 pmDEN-SEA
2h 58mnonstop
$197Delta
Find Deal
Wed, May 21 - Tue, Jun 3
Alaska Airlines Logo
10:15 am - 1:58 pmSEA-DEN
2h 43mnonstop
Alaska Airlines Logo
11:40 am - 3:26 pmDEN-SEA
4h 46m1 stop
$217Alaska Airlines
Find Deal
Wed, May 21 - Wed, May 28
Delta Logo
1:30 pm - 10:16 pmSEA-COS
7h 46m1 stop
Delta Logo
8:15 am - 2:45 pmCOS-SEA
7h 30m1 stop
$217Delta
Find Deal
Wed, Jun 11 - Wed, Jun 18
Southwest Logo
7:50 pm - 11:30 pmSEA-DEN
2h 40mnonstop
Southwest Logo
8:05 pm - 1:25 amDEN-SEA
6h 20m1 stop
$227Southwest
Find Deal
Fri, Jun 13 - Mon, Jun 16
United Airlines Logo
7:00 am - 2:59 pmSEA-DEN
6h 59m1 stop
United Airlines Logo
7:16 pm - 12:59 amDEN-SEA
6h 43m1 stop
$232United Airlines
Find Deal
Tue, May 13 - Tue, May 20
Alaska Airlines Logo
11:20 am - 6:09 pmSEA-DEN
5h 49m1 stop
Alaska Airlines Logo
11:40 am - 3:26 pmDEN-SEA
4h 46m1 stop
$235Alaska Airlines
Find Deal
Sat, May 24 - Wed, Jun 4
United Airlines Logo
8:50 am - 2:43 pmSEA-COS
4h 53m1 stop
United Airlines Logo
5:15 pm - 12:59 amCOS-SEA
8h 44m2 stops
$242United Airlines
Find Deal
Wed, May 14 - Wed, May 21
Southwest Logo
9:15 am - 6:10 pmSEA-DEN
7h 55m2 stops
Southwest Logo
5:15 pm - 11:50 pmDEN-SEA
7h 35m1 stop
$242Southwest
Find Deal
Tue, May 13 - Tue, May 20
Useful Info

KAYAK's insights & trends for Seattle to Colorado flights

Get data-powered insights and trends into flights from Seattle to Colorado to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Seattle to Colorado flight route?

The cheapest price for flight routes found by users searching on KAYAK in the last 2 weeks for round-trip flights from Seattle to Colorado.

The cheapest ticket to Colorado from Seattle found in the last 72 hours was to Denver, at $118 round-trip. The most popular route is from Seattle (SEA) to Denver (DEN), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $118.

What is the cheapest month to fly from Seattle to Colorado?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Colorado, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Colorado is September, when tickets cost $158 (return) on average. On the other hand, the most expensive months are December and March, when the average cost of round-trip tickets is $254 and $217 respectively.

What’s the cheapest day of the week to fly from Seattle to Colorado?

The average price of all round-trip flights from Seattle to Colorado clicked on KAYAK for each day over the last 12 months.

When flying from Seattle to Colorado, you should consider leaving on a Friday and avoid Mondays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Fridays and the most expensive ones on Sundays.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Colorado, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to Colorado, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.


Good to know

Low seasonJanuary
High seasonMay
Cheapest flight$66
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly with an average 3% increase in price.
Flight from Seattle to Denver

Flights from Seattle to Colorado: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Seattle to Colorado 
Verified travelerFlew with Alaska AirlinesSEA-DENMar 2025
Alaska Air is very efficient & on-time so allow enough time to get luggage, go thru Customs & Immigration, & long security lines. Terminals in SEA are readily accessible by trains but more signage is needed. Fortunately, Information booths are everywhere & are manned by very helpful staff.
MichaelFlew with DeltaSEA-DENApr 2025
Train from Denver airport to downtown is easy to use.
Verified travelerFlew with Alaska AirlinesSEA-DENDec 2024
I didn’t have any problems using Alaska Airlines
Verified travelerFlew with Alaska AirlinesSEA-DENMay 2024
When flying from Seattle to Denver, be ready to take our any electronics and put them in separate bins when going through security. You will also most likely have to take off your jacket as well. During our flight back the flight randomly changed so be on the lookout in case that happens to you! It was by chance that I checked my ticket and saw that the gate changed last minute.

FAQs - booking Colorado flights

  • How does KAYAK find such low prices on flights from Seattle to Colorado?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Colorado.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Colorado?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Seattle to Colorado is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Colorado?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Seattle to Colorado with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Colorado?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Seattle to Colorado up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Colorado?

    The cheapest time of day to fly to Colorado is generally at night, when round-trip flights cost $209 on average. Morning departures are around 20% more expensive than evening flights, on average. The most expensive time of day to fly to Colorado is generally in the morning, which is peak travel time and where the average cost of a ticket is $334.

Top tips for finding cheap flights to Colorado

  • Looking for a cheap flight? 25% of our users found tickets from Seattle to the following destinations at these prices or less: Denver $120 one-way - $209 round-trip

Top 5 airlines serving from Seattle to Colorado

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Colorado. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Colorado? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 9968 reviews
8.2Boarding
7.1Entertainment
7.9Comfort
7.1Food
8.5Crew
Airline reviews

I made a mistake. Read what I wrote in the flight from Dulles to SEA. The negative experience was from SEA to BOI. Total garbage. Wont do it again.

2.0 MediocreAnonymous, Apr 2025SEA - BOI
Read more Alaska Airlines reviews

I made a mistake. Read what I wrote in the flight from Dulles to SEA. The negative experience was from SEA to BOI. Total garbage. Wont do it again.

Need to get on train for second flight it’s much nicer when all the gates are together for obvious reasons

Cramped, crowded aircraft. Poorly organized boarding. Tasteless crackers to eat. 40 minutes late. A standard US air travel experience.

Would not mind having movie options an available like Delta, but is not necessary. Did not have food, so cannot appropriately rate that section.

Three hour flight so snacks and basic drinks unless you pre buy as usual. Didn’t do my emtertainment as was tired after 23 hours of travel. You have to use your own device on US flights if travelers aren’t aware so if you only use your cell phone that can be small. Crew are great.

Awful. We got the last seats and they don't recline. We've been on this horrible journey since 6am and won't get to our destination almost a full day later. Oh and no food, either. Never again.

An uneventful flight is a good experience although one of the pilots gauges wasn’t working right so we had a half hour delay—no one can foresee that.

Plane was delayed and got me in past bedtime. But more importantly, my tsa precheck number wasn’t on my ticket so had to deal with the general line. Oh well, guess the delay helped that situation.

It was as good as flying can be, which is still very uncomfortable. Clean new aircraft, great crew.

Everything was good. The flight attendants were great. I was disappointed that there wasn’t any screens on the back of the seats to watch movies, tv, etc. I only had my phone to watch movies on.

It is southwest seat was ok. Not the most comfortable seat

I’ve always loved Southwest. No issues at all. I was flying standby and the gate agent was extremely friendly and helpful. Boarding was smooth and I was able to get a window seat in the emergency exit row. Crew was fantastic! They were very professional and accommodating. We had to divert from our destination due to weather but the flight crew kept everyone at ease and informed us of all pertinent information. Excellent flight

The price of the tickets isn't matching the flight experience. No matter how long the flight is, you're only getting pretzels. The flight attendants looked unkept and over it.

Plz don't take away free bags and free seating

The seats were a bit cramped and worn, but otherwise okay.

I would have liked to arrive on time - not 5 hours late!

After a 3 hour layover in Denver my flight was delayed over 5 hours! No explanation; no assistance; no offer to provide compensation; no one at Southwest was willing to offer any assistance. 8 hours in the Denver airport - ridiculous!

WiFi on the flight was not working. Thus, entertainment options were limited.

I really like open seating. I hate that I've heard this is going away. This is one of the unique things that makes Southwest my goto choice.

For the first time in a long time we had a flawless experience with Southwest. Both flights were early and no mechanical errors at all. We were shocked and pleasantly surprised 😮.

Delta is my preferred airline. I've traveled with them for years. On time in most cases, good communication, easy to use app. Most planes are pretty nice. I was on a CRJ 700/900 however, which was pretty badly aged inside and needed a refresh. No infotainment, unreliable wifi, best to download before boarding or bring a book. Food choices are really just snacks on this flight, nice variety but about what you'd expect. Great staff and prompt in departure and early arrival too. Overall quite satisfied.

Crew was friendly Love the entertainment in the seat head rest.

Delta flight was on time, seats were comfortable, and crew was nice.

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

Delayed take-off. Very small plane so very scary with lots of bumps during the flight. Would never fly Delta on short flights in small 80 seaters plane again! Felt relieved when landed.

The worst part was I was NOT allowed in the lounge even though I was holding a first class ticket and have a premium American Express card. I have flown Business or First Class with many airlines. Delta is the ONLY one who does not extend this courtesy to anyone except people who hold the very expensive American Express card. As a result, I won’t fly Delta if I have any other choice.

A little bumpy ride . No food was being provided due the the turbulence. That was ok it was a short flight to my standards.

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

The Dekta Rep that checked us in was great. She's very personable, pleasant, and can tell she enjoys her job.

The plane was old with small storage areas that had problems closing/latching and not enough storage for everyone, and worn, damaged seats. Service was great but feel a little unsafe on such well used planes.

The gate attendant let me walk right by her with a bag too big for the overhead compartment

Food choices were very limited. Taste of the dishes was average.

I liked all the informational texts. I always knew where to go and when .

Received an email the night before showing that there would be seatback entertainment on our flight. We get on and there was no seatback entertainment. And then it was a scramble to try to set up the iPads for the kids before takeoff so they could watch something for the four hour flight.

The reason I don’t fly United. No in seat entertainment for a long flight and inconsistent WiFi and entertainment available from my device.

It was a good flight. Nothing comes to mind about how it could have been better. It was a newer plane, seemed like a great upgrade from your older ones. Staff was very good as well.

The food for long haul was poor compared to Singapore airlines economy. Pasta plain with tomato sauce . Singapore airlines give me Hagen dash small ice cream cup it was great. The choices of dinner course Singapore air also much better The crew mostly friendly. The economy seat are as expected.

The plane was clean. The staff was excellent. The flight attendants were very good. Enjoyable flight. Overall. The seats in the back are too small but, will always be.

Flight was 3 1/2 hour delayed with no credit or meal vouchers

late departure due to some unspecified issue with ventilating the cabin. They got it running but it was FREEZING for the whole flight. I asked for a blanket but they didn't provide one. They could not turn up the heat. it was quite miserable.

Seats are uncomfortable but price is good. Guess I can put up with misery for four hours.

I’ve never traveled on Frontier before. If you want basic, no frills, friendly service at great prices then give them a fly!

i was denied boarding, even though i had an assigned seat, checked in on line and was at airport early. Then they refused to fully refund the the fair and replacement fair because they claimed it was "no show/denied boarding". I will never fly this airline again

The plane failed preflight inspection, so we sat there for 90 mins while they tried to fix it. Ultimately, everything was remedied and we made our connecting flight; instead of a 2 hour layover at the airport, we spent it waiting on the plane.

I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.

The seats were extremely hard and uncomfortable. It was disappointing even for a budget airline.

I was surprised that all baggage, including carry on, were charged. Each additional bag went up in cost. Really disappointed in the additional costs.

Delayed each time on a round trip with no significant weather interference. Updates to flight times came after the fact. 30 min behind in boarding and board and phone still show an on time departure. Some mysterious extra 300 miles that came so surprising they had to fuel while we were already on board?

Our flight was canceled for no known reason. We weren’t told until we were checking in at 5:00 am. This was after our last flight with Frontier where we sat on the plane for three hours (not an exaggeration) before we took off because of a mechanical issue. We won’t be flying Frontier again.

Allowed me to chose my seat without extra charge (I purchased full-price ticket) and boarding was in group1. Didn't even serve water.

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

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