COS - SEA

$134 Find Cheap Flights from Colorado Springs to Seattle - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Colorado Springs to Seattle departing on 9/16. 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

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Everything you should know

Cheapest round-trip
$267
Typical prices: $346-$446
Delta
Tue 9/22Tue 9/29
COS - SEA • 1 stop
Cheapest one-way
$134
Typical prices: $133-$213
Delta
Wed 9/16
COS - SEA • 1 stop
Top airlines
Cheapest • from $267 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Colorado Springs and Seattle. You'll need at least 1 connection.
Insights
Insights
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Insights
Top layover airports
Cheapest • Avg $294 (round-trip)
Shortest trip • 5h 27m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 18% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 42% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Colorado Springs to Seattle (COS-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Colorado Springs to Seattle 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 Colorado Springs to Seattle

Tue, Sep 22 - Tue, Sep 29
Delta Logo
6:11 pm - 10:10 pm
COS
-
SEA
4h 59m
1 stop
Delta Logo
9:40 am - 5:31 pm
SEA
-
COS
6h 51m
1 stop
$267Delta
Wed, Sep 23 - Tue, Sep 29
Delta Logo
6:11 pm - 10:10 pm
COS
-
SEA
4h 59m
1 stop
Delta Logo
9:40 am - 5:31 pm
SEA
-
COS
6h 51m
1 stop
$267Delta
Wed, Sep 16 - Wed, Sep 23
Southwest Logo
1:15 pm - 6:10 pm
COS
-
SEA
5h 55m
1 stop
Southwest Logo
11:40 am - 8:00 pm
SEA
-
COS
7h 20m
1 stop
$267Southwest
Fri, Sep 11 - Sat, Sep 19
Southwest Logo
4:20 pm - 11:00 pm
COS
-
SEA
7h 40m
1 stop
Southwest Logo
11:25 am - 8:10 pm
SEA
-
COS
7h 45m
1 stop
$267Southwest
Tue, Aug 25 - Sat, Oct 10
United Airlines Logo
5:30 am - 10:01 am
COS
-
SEA
5h 31m
1 stop
United Airlines Logo
5:00 am - 12:27 pm
SEA
-
COS
6h 27m
1 stop
$267United Airlines
Sat, Sep 19 - Tue, Sep 29
Delta Logo
6:11 pm - 10:10 pm
COS
-
SEA
4h 59m
1 stop
Delta Logo
9:40 am - 5:31 pm
SEA
-
COS
6h 51m
1 stop
$267Delta
Wed, Oct 7 - Sat, Oct 10
United Airlines Logo
6:00 am - 10:01 am
COS
-
SEA
5h 01m
1 stop
United Airlines Logo
5:00 am - 12:27 pm
SEA
-
COS
6h 27m
1 stop
$287United Airlines
Sun, Sep 6 - Mon, Sep 21
United Airlines Logo
6:00 am - 10:01 am
COS
-
SEA
5h 01m
1 stop
United Airlines Logo
5:00 am - 10:21 am
SEA
-
COS
4h 21m
1 stop
$293United Airlines
Sat, Aug 29 - Sat, Sep 5
American Airlines Logo
3:51 pm - 10:26 pm
COS
-
SEA
7h 35m
1 stop
American Airlines Logo
5:00 am - 2:54 pm
SEA
-
COS
8h 54m
1 stop
$517American Airlines
Thu, Sep 24 - Thu, Sep 24
American Airlines Logo
1:18 pm - 9:52 pm
COS
-
SEA
9h 34m
1 stop
American Airlines Logo
11:59 pm - 9:22 am
SEA
-
COS
8h 23m
1 stop
$627American Airlines
Booking Insights

KAYAK's insights & trends for Colorado Springs to Seattle flights

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

How much is a round-trip flight from Colorado Springs to Seattle?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Colorado Springs to Seattle departing in September.

Flight prices are below average for this route right now.

Flights to Seattle from Colorado Springs usually cost between $294 and $447 in September.
The lowest price found in the past 5 days was $267 on Southwest (Sep 11-Sep 19).

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Colorado Springs to Seattle, 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 Colorado Springs to Seattle is January, where tickets cost $224 (return) on average. On the other hand, the most expensive months are June and December, where the average cost of round-trip tickets is $530 and $476 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Colorado Springs to Seattle, 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 Colorado Springs to Seattle, you should book around 2 weeks before departure, which saves you about 18% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.

Good to know

Low season

February

Cheapest flight

$134
Best time to beat the crowds but there is an average 2% increase in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from Colorado Springs to Seattle

When to book flights from Colorado Springs to Seattle

Are your dates flexible? Find out the best times to travel from Colorado Springs to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Colorado Springs to Seattle

  • What is the cheapest flight from Colorado Springs to Seattle?

    In the last 5 days, the lowest price for a flight from Colorado Springs to Seattle was $134 for a one-way ticket and $267 for a round-trip.

  • Do I need a passport to fly between Colorado Springs and Seattle?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which aircraft models fly most regularly from Colorado Springs to Seattle?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Colorado Springs to Seattle?

    SkyTeam, and Star Alliance are the airline alliances operating flights between Colorado Springs and Seattle, with SkyTeam being the most commonly used for this route.

  • What is the most popular layover when flying to Seattle from Colorado Springs?

    Denver is the most popular layover city among KAYAK users traveling from Colorado Springs to Seattle.

  • Which is the best airline for flights from Colorado Springs to Seattle, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Colorado Springs to Seattle are Southwest and Delta. With an average price for the route of $418 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $311 and an overall rating of 7.8.

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

    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 Colorado Springs to Seattle.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Colorado Springs 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 Colorado Springs to Seattle?

    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 to Seattle with an airline and back to Colorado Springs with another airline. Booking your flights between Colorado Springs and SEA can sometimes prove cheaper using this method.

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

    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 to Seattle from Colorado Springs up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Colorado Springs to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Colorado Springs to Seattle. 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 Colorado Springs to Seattle? 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
SouthwestOverall score based on 4227 reviews
8.6Crew
7.0Food
8.1Boarding
8.0Comfort
7.5Entertainment
Airline reviews

Southwest is kind of a slum airline. It’s gotten more expensive over the years for less and less service. I am a Southwest Chase Visa card holder and was forced to choose a seat in the 26th row in the middle seat. However my wife who is a rewards member but doesn’t hold a card or anything else, gets randomly assigned a normally paid seat in row 6! How does that work?

4.0 OkayDavid, Apr 2026
COS - DAL
Read more Southwest reviews

Southwest is kind of a slum airline. It’s gotten more expensive over the years for less and less service. I am a Southwest Chase Visa card holder and was forced to choose a seat in the 26th row in the middle seat. However my wife who is a rewards member but doesn’t hold a card or anything else, gets randomly assigned a normally paid seat in row 6! How does that work?

Paid for premium extra leg room but the bin space for rows 1-3 had to go in rows 4-6 and 4-6 had to go to 7-9 because flight attendants have snacks and their luggage upfront. So we pay extra to have to fight thru traffic to get our bags. Only 2nd day of new seating so hope they fix this.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

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

Board Milian spokesman with pre boarding , not after A group and without my spouse. Total BS, back to Alaska Airlibes I GO. oner 1.2M miles and 900 flights, and every time I fly SWA I regret it, thos will be last time, I only flew SWA but to time requirements fir a Funeral. NEVER AGAIN SWA

Good crew, funny movies, but you need phone ports in the plane and better snacks. :)

Had a long layover in rainy Chicago. The staff were attentive - my husband needed a wheelchair due to a recent fall and unsteady on his feet. They are wonderful for those of us who need a bit of extra care. My only complaint was discovered upon unpacking our suitcases at home. One (we had 3 carry on size and one just a bit larger) had water damage to everything inside. All the clothing (just happened to be the case with the clean clothes) were wet. I know it was raining, but why would items inside be wet? The paperwork packed in this case was damp with ink running. There were momentos from our 10-day European vacation that I was hoping to scrapbook - but alas, they will be scrapped - too damaged to keep. The boxes of French chocolate were damp on the outside. My expensive camera now has a cracked screen and a Gaudi tea-for-one was cracked - even though it was packed in clothing. I know it happened on this flight as I repacked all four suitcases before leaving New York in the morning. My first unhappy experience with luggage at Southwest.

Great no problem boarding suitcase on time for pick up

The a/c wasn’t working very well and it was a very hot flight

Not really a “Delta” problem but worth mentioning: Boarding was a difficult process. TSA seemed understaffed and Pre-Check took longer than regular TSA. The supervisor was frazzled and yelled at travelers. Once through TSA, we had to put our carry-ons through another x-ray machine. Then queue up to board with both boarding pass and ID. Then, when we got to the stairs on the tarmac, we had to show our boarding pass again. Maybe this is just normal for Kona since the terminal is outdoors (but still a “secured” area).

Checkin was good, fllight ws good. Onlly complaint is lack of foot on 6 hour flight from Seattle to Boston. Snacks were flimsy - chips and cookies. could have offered something more substantial for such a long flight. I know you can buy food in airport but for the price you pay for a ticket, they should step up for the passengers.

Flight was delayed, we could have been notified earlier and in a consistent manner. App was not refreshing for another passenger to get the latest flight status. We could have stayed and waited at the hotel instead of waiting at the airport had we known the flight was going to delayed for more than 5 hours. The toilet is too tight, and needs to be cleaned more frequently (every hour). The entertainment screen froze, the touch screen not responding to touch. We were upgraded to comfort, it is more comfortable than regular economy seats.

It was fine. 55 minute flight. No snacks or beverage service offered. Boarding went smoothly and my walker was waiting for me on the jet way.

My flight was cencaled due with the bad weather on Sunday the crew was poorly mistaken my luggage supposed depart with my flight instead I didn’t have my luggage for almost 3 days the website is poorly respond to my complain until I have someone to do it my connection smooth their not even respon or email me even the have my luggage

8 hours late and the plane smelled like urine, that smell in the morning when your child wet the bed in the night.

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!

Prior to takeoff, the pilot told us there was a possibility of not being able to land and going to Portland. Well that happened, we took off and then did 8 loops around Spokane before the pilot told us we ran out of fuel and had to go to Portland. So for a 35 minute flight we have now been on the plane for 3 hours (boarded at 6:50 am and landed in Portland at 10:30). Then, we just sat in Portland's airport with no updates of when we can start heading back. All of a sudden, our pilots and crew just left, leaving us stranded in a different city and state. We continued to sit in Portland until we finally got a new crew assigned and boarded the plane (This was from 10:30-2). We then sat on the plane for an additional hour before take off because they had to count us multiple times. We finally landed in Spokane at 3:55 PM. So a flight that should have taken at max an hour took us 10 hours and we missed the majority of the recruiting event we went for.

Staff was great! Kind and cordial! Middle seat row 28 seat B has a hump in it. Trays were getting stuck when putting down and up. Good flight

Boarding was organised and relaxed. Crew were fantastic! Seats were lacking padding causing butt pain and stiffness.

The flight was delayed by a hour and I wish they had communicated it sooner. No issues on the plane, it did take a while for food to come.

Smooth and easy boarding, comfortable for the entire 5 hour flight, and the seat back entertainment was great! I appreciated all the features, from location info and maps, movies, the ability to connect with Bluetooth headphones, and good selection of movies. Food was good, normal airline snacks (I didn’t purchase anything)

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

leg space better than expected. two washrooms for one plane isn't enough.

The seats on this flight were almost roomy enough to be the basic amount needed for human existence. I think my favorite part of this flight was it landed at an A gate, which was the most palatial part of Sea-Tac I've ever seen - a massive improvement from the S gates.

Everything was fantastic. Modern plane. All the amenities! Although the paid snacks and meals are pure robbery. Like i understand airlines need to make money, but 11$ USD for an overnight oats with some nuts in it and barely any pieces of apple.... Highway robbery

An hour and a half late is UNACCEPTABLE. The negative impact to our family is unconscionable. And for the price we were forced to pay...

Our flight was delayed many times throughout the day. The final delay was about 8 hours. I spent time in line to speak to someone at their understaffed desk, and also spent time waiting online and then chatting with a service rep. None of the United employees were any help at all. I desperately wanted to go get rest and possibly re-book my trip but I was denied any compensation or voucher for a hotel. I was repeatedly told it was not United's fault and therefore they had no compensation to offer. Overall, a cold and callous experience.

Flight crew and pilots did great. Flight way delayed due to a part needing replacement. Based on what the pilot indicated- the maintenance crew could’ve resolved this more efficiently than replacing whole part- and taken less time

The most cramped seating I’ve ever experienced, (including budget airlines) with no food available for purchase on a nearly 6 hour flight.

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

Information on your arrival and departure airports