$42 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 4/6. 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.
1 adult
1 adult, Economy, 0 bags

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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Flight Deals

Cheap Flights from Seattle to Colorado

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Denver
Denvernonstop$79
Aspen
Aspen1 stop$249
Grand Junction
Grand Junction1 stop$211
Durango
Durango1 stop$310
Montrose
Montrose1 stop$216
Hayden
Hayden1 stop$216
Gunnison
Gunnison2 stops$505
Vail
Vail1 stop$257
Denver
Denvernonstop$79
Aspen
Aspen1 stop$249
Grand Junction
Grand Junction1 stop$211
Durango
Durango1 stop$310
Montrose
Montrose1 stop$216
Hayden
Hayden1 stop$216
Gunnison
Gunnison2 stops$505
Vail
Vail1 stop$257

Book Cheap Seattle to Colorado Plane Tickets

 
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.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Colorado

Sat, Apr 18 - Mon, Apr 20
Frontier Logo
7:12 pm - 10:59 pm
SEA
-
DEN
2h 47mnonstop
Frontier Logo
7:15 am - 9:27 am
DEN
-
SEA
3h 12mnonstop
$79Frontier
Tue, Apr 21 - Tue, May 5
Frontier Logo
7:12 pm - 10:59 pm
SEA
-
DEN
2h 47mnonstop
Frontier Logo
7:15 am - 9:27 am
DEN
-
SEA
3h 12mnonstop
$80Frontier
Thu, Apr 16 - Fri, Apr 17
Frontier Logo
4:20 pm - 8:11 pm
SEA
-
DEN
2h 51mnonstop
Frontier Logo
7:40 am - 9:52 am
DEN
-
SEA
3h 12mnonstop
$81Frontier
Tue, Apr 14 - Tue, Apr 21
United Airlines Logo
5:00 am - 8:44 am
SEA
-
DEN
2h 44mnonstop
United Airlines Logo
5:57 pm - 11:27 pm
DEN
-
SEA
6h 30m
1 stop
$85United Airlines
Wed, Apr 22 - Sun, Apr 26
Southwest Logo
6:50 am - 4:10 pm
SEA
-
COS
8h 20m
1 stop
Southwest Logo
1:50 pm - 11:00 pm
COS
-
SEA
10h 10m
1 stop
$156Southwest
Wed, Apr 1 - Sun, Apr 5
Delta Logo
1:32 pm - 10:05 pm
SEA
-
COS
7h 33m
1 stop
Delta Logo
8:15 am - 2:54 pm
COS
-
SEA
7h 39m
1 stop
$167Delta
Tue, Apr 14 - Fri, Apr 17
Delta Logo
5:35 am - 11:12 am
SEA
-
COS
4h 37m
1 stop
Delta Logo
7:59 am - 2:46 pm
COS
-
SEA
7h 47m
1 stop
$168Delta
Wed, Apr 15 - Fri, Apr 17
Southwest Logo
9:20 am - 3:30 pm
SEA
-
COS
5h 10m
1 stop
Southwest Logo
7:20 pm - 12:55 am
COS
-
SEA
6h 35m
1 stop
$205Southwest
Tue, Apr 28 - Sat, May 2
United Airlines Logo
5:00 am - 10:49 am
SEA
-
GJT
4h 49m
1 stop
United Airlines Logo
5:30 am - 9:40 am
GJT
-
SEA
5h 10m
1 stop
$211United Airlines
Sat, Mar 21 - Sat, Mar 28
Alaska Airlines Logo
1:22 pm - 4:49 pm
SEA
-
HDN
2h 27mnonstop
Alaska Airlines Logo
5:29 pm - 7:21 pm
HDN
-
SEA
2h 52mnonstop
$237Alaska Airlines
Booking Insights

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?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Colorado from Seattle found in the last 72 hours was to Denver, at $86 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 $86.

Can I save money by flying with a layover from Seattle to Colorado?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $377, prices are generally cheapest when you fly direct.

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 January, when tickets cost $159 (return) on average. On the other hand, the most expensive months are June and December, when the average cost of round-trip tickets is $245 and $228 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 Sundays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Thursdays 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 3 weeks before departure, which saves you about 23% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$42
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly with an average 21% 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 
DebraFlew with Alaska Airlines
SEA
-
DEN
Feb 2026
Seattle TSA much improved. Faster service. Baggage check-in ok. I'm sure will get faster as people get used to it.
Verified travelerFlew with Alaska Airlines
SEA
-
DEN
Mar 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 Delta
SEA
-
DEN
Apr 2025
Train from Denver airport to downtown is easy to use.
Verified travelerFlew with Alaska Airlines
SEA
-
DEN
May 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 $246 on average. Morning departures are around 13% 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 $316.

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 $143 one-way - $216 round-trip

Reviews of the 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 11966 reviews
7.8Comfort
7.1Food
8.5Crew
7.0Entertainment
8.1Boarding
Airline reviews

Plane was clean, staff was professional and flight was on time. No built in tv was still ok, as programs were offered that could synch to smart phones.

10.0 ExcellentJeffrey, Feb 2026
SEA - BOS
Read more Alaska Airlines reviews

Plane was clean, staff was professional and flight was on time. No built in tv was still ok, as programs were offered that could synch to smart phones.

J was in the ER x 3...3 protruding discs...contacted Alaska many many days prior to cancel and request a refund or a credjt.. they only gave me 50 % credit....outrageous seeing how i have a doctors letter....just plain inhuman. AI sucks!

The flight was too short. No snacks or drinks offered.

The flight attendant was friendly and attentive. Although our interaction was brief—- it made a difference. The crew was upfront about turbulence. I like the Maui pretzels.

Everything was good. Please have a wheat free option for snacks in the future.

They are always so great! Friendly, on time if not early, organized boarding process. Great price too.

Crew very courteous. Boarding was great. Slow to get baggage at Denver.

Lester and the rest of the crew were such a joy. Also, I want to thank the pilots for getting us there on time, and safely. My first amd only choice will always be Alaska Airlines.

Not delay for a few passengers. That was uncalled for. If idiots can't make the flight on time thats their fault. Why should I be punished for them? No more holding the plane for one or two people

I paid for the WiFi and it didn’t work during the whole flight

It was canceled. Supposedly weather. But there was no snow in Baltimore. At least we found out before driving to airport

I have not flown Southwest in awhile and had a very pleasant experience. From ticketing to boarding to the flight. The flight left on time and landed ahead of schedule. It won't be so long next time!!

The Southwest experience has definitely taken a dive from its early days. You can no longer deferentiate from other airlines. Air travel is too expensive. Southwest is no longer budget friendly. They have lost me as a loyal customer.

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

The WiFi and crew on the plane were good, however, the boarding experience was awful. I paid for the Choice Preferred and was boarded in group 5 so all overhead storage was full. They found room for our luggage, but further back making getting off the plane a nightmare. Also, we were in row 6 and the seats were extremely uncomfortable. Both my daughter and I had no leg room and couldn’t wait to get off the plane.

The charges were ridiculous for an hour flight and the turbulence was very scary.

Still need to work out the kinks on the new assigned seating boarding process. Otherwise, a very good flight.

WiFi did not work. Boarding with the new seating assignments took too long. The temperature in the terminal was obnoxious. +/- 80°

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

Everything was good except wifi and a leaking drink chiller. The floor was all wet and my bag was soaked. Did not notice until debarking. Have not heard back from Delta. Even though this was leg one of an international flight in first class, they denied access to their Sky Club - very disappointing!

The staff was fine. The plane was extremely tight, and I paid for the wifi and it did not work at all. I was actually going to ask for a refund.

two hour delay and the Delta representative on the PA system was unable to understand

An awesome flight crew. FC seat cushion just doesn’t cut it for a 3+ hour flight.

2+hrs delay without any reason provided and a cramped flight

We waited an hour on the runway to get a gate in Orlando

Flight was delayed by 3-hours and their fix was… complimentary pretzels.

Flight was delayed due to crew being not on time

Flight crew issues delayed my flight by 2 1/2 hours. Causing me to miss my connection.

The staff on board and gate was nice - a welcome change from the usual. We also arrived early, which was a great benefit, given that it takes 30 minutes plus to get bags at SRQ.

We got delayed three hours and nobody thought to have the bathroom fixed while we were sitting waiting to board? took a full hour to have maintenance come and check it off. Had to shut the bathroom down twice so that the pilots could go to the bathroom. Everyone missed their connections.

Women boarding passengers at the gate was absolutely rude and disrespectful of passengers. The flight attendant was absolutely delightful! Smiling and connected with the passengers. So happy. The seats are cramped and uncomfortable but I guess that’s just the way it is Communication regarding flight was excellent

As great a red-eye flight as red-eye flights can be.

Both of my flights arrived early and check in process was smooth

Everything was on time Will use united again for sure

The flight was delayed by two de-icings. The seatbelt did not work correctly. It did not stay tight.

Hotter than Hades in August. Why, why do crews think that in the winter when we are already dressed for cold weather we need a cabin that is 82 degrees. Even the vents were blowing hot air.

Flight was delayed. De-icing took a while. When we landed had to wait for another plane to vacate our gate. Just an overall bad experience.

Not good - outbound flight was delayed and missed my connection even though I got to the gate after running through the airport - the agent would not let me on because the door was closed (flight had not left). There was no notification from United - overall experience was very disappointing. Additionally, I was downgraded from first class to coach on the alternative flight

United have really come back. Airport and boarding process is clear and good, app and information also very good

It was costly and difficult to check in. $85 to take a small suitcase with me, carry on or checked and $75 on the return trip, Plus $25 if I didn't check my self in check in $25, because I couldn't do it on the kiosk. Small very uncomfortable seats, waited on the runway for near an hour each way. It was my worst flight to date.

Due to weather, my flight was delayed, further delayed, then canceled. I eventually got through to a support person who helped me find a different route out of MSP, but to get to DIA, they didn't want to, but eventually did help with the connection ticket purchase. But even this replacement flight was delayed time and time again, and I would have missed my connecting flights and I didn't want to get stuck in a layover city, so after 12 hours at the airport with two young boys who were very tired, we just cancelled our plans and spent the week at home, instead of Nana's.

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

Seats were new and comfortable. Staff was fine. Missed my connection due to weather -which wasn’t their fault- but got no help at all. Gate staff sent me to customer service, which was and stayed unstaffed. Sign with QR code directed me to call or chat. Chat was useless. Call was returned after an hour. No itinerary offered by Frontier could get me home in less than 30 hours. Rebooked with another airline and got a partial refund that came to about 10 percent of what I paid to get home.

The experience was good. No frills but I got there safe and sound and on time.

As every law enforcement agency I could imagine surrounded the plane and we didn’t disembark for 2 hours and then had to stick around for another hour to go get our personal belongings after leaving them behind and being bused away from the plane, it was scary and inconvenient. We were given no information as to why this was happening. Lack of communication with passengers was disappointing.

The ticketing agents were rude but then we had a great gate agent very nice we had to ride a buss out to where the plane was parked but it was in some back corner of the airport when we got to the plane the captain who was great btw was cleaning the plane because the same rude ticketing agent told them they we not contracted to vacuum the plane. The ride to las Vegas was fine We had a connecting flight to Dallas. The flight was fine but when we arrived in Dallas everyone who flew on any frontier airlines the picked up bags from baggage claim D15 had to wait over a hour for their bags to start we arrived at 11:30pm ish to the gate we didn't leave the baggage clamed till 12:50 am very not happy and i used to fly frontier 4 times a week for work in Denver i will not be using them again

Frontier Airlines was AWFUL. I was an hour early for my flight and the lady refused to check me in. I had to purchase a whole new ticket with a different airline.

Late, terrible communication, horrible planning of passenger seating until the literal last minute. One of the worst flying experiences of my life. Y'all suck

First of all, we never got on the connecting flight to Denver. They delayed our flight for two hours. If we would have gotten on that flight, we would have been stuck in Denver for 13 hours. So we re- routed our flight for a straight through flight to Oklahoma two days later. THEN, they delayed that flight for two hours. After that we were able to finally get on our flight and come home. Frontier Airlines - one of the worst airlines I have ever been on.

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

Information on your arrival and departure airports