Title: Cheap Flights from Colorado Springs to Seattle (COS to SEA) - Expedia.co.uk ![](https://images.trvl-media.com/place/178307/82efb684-8d05-4b09-b7ea-52d5ab4ea1ac.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/178307/82efb684-8d05-4b09-b7ea-52d5ab4ea1ac.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights from Colorado Springs (COS) to Seattle (SEA) - [Return](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from Colorado Springs Municipal Airport (COS) to Seattle-Tacoma International Airport (SEA) - ![United](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United [](https://www.expedia.co.uk/Flights-Search?leg1=from:cos,to:sea,departure:17/10/2025TANYT&leg2=from:sea,to:cos,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) - ![Delta](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta [](https://www.expedia.co.uk/Flights-Search?leg1=from:cos,to:sea,departure:17/10/2025TANYT&leg2=from:sea,to:cos,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) - ![American Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines [](https://www.expedia.co.uk/Flights-Search?leg1=from:cos,to:sea,departure:17/10/2025TANYT&leg2=from:sea,to:cos,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) - ![Southwest Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_WN.svg) Southwest Airlines [](https://www.expedia.co.uk/Flights-Search?leg1=from:cos,to:sea,departure:17/10/2025TANYT&leg2=from:sea,to:cos,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WN"}}]) ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 25% on select hotels after you book a flight\* ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.co.uk/login) ## Find the cheapest month to fly from Colorado Springs (COS) to Seattle (SEA) ### September is typically the cheapest month to fly From £103 - £229 per traveller. Flight from Colorado Springs to Seattle route information | Origin airport | Colorado Springs | | --- | --- | | Destination airport | Seattle - Tacoma Intl. | | Distance | 1705 km | ## Compare flights from Colorado Springs to Seattle easily and book with confidence For travelling on business or for pleasure, Expedia makes it easy to book your flights from Colorado Springs to Seattle. Operating between them flights per day, airlines cover the route. And fly direct, getting you to Seattle - Tacoma Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Colorado Springs to Seattle - Tacoma Intl..   To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights.  Grab a great deal on your flight from Colorado Springs (COS) to Seattle - Tacoma Intl. (SEA) The easiest way to view the best deals on flights from Colorado Springs to Seattle today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Colorado Springs to Seattle - Tacoma Intl. start at just and range up to .   To find an even better deal, try   - being flexible on your dates – midweek flights can be cheaper - looking for other airports near Colorado Springs and Seattle - booking your flight during , the cheapest month on this route - varying your flight times – early morning and late at night are sometimes cheaper  Why you should book your Colorado Springs to Seattle flight with Expedia! We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Colorado Springs to Seattle - Tacoma Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.   Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.   ## Frequently asked questions ### How much is a flight from Colorado Springs Airport (COS) to Sea-Tac Airport? > Based on fares offered within the last 7 days on Expedia for flights departing within the next year, round-trip flights between COS and SEA start from . Book now to secure the best price for your journey. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from City of Colorado Springs Municipal Airport to Seattle - Tacoma Intl. Airport (SEA)? > Each air carrier has its own terms and conditions. If you do decide to cancel, follow the easy instructions on our [Customer Service Portal](https://www.expedia.co.uk/service/?langid=1033). ### How do I find cheap flights from COS to SEA that have flexible change policies? > Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for COS to SEA flights, you'll see a "no change fees" filter for you to select. ### How far is the flight from COS to Seattle - Tacoma Intl. Airport (SEA)? > It's around 1,700 kilometres from City of Colorado Springs Municipal Airport to SEA, so expect to be in your seat for a while. Keep yourself entertained by packing things like a magazine or a thrilling novel. ### Which airlines fly direct from City of Colorado Springs Municipal Airport to Sea-Tac Airport? > Currently, no airlines offer flights directly from City of Colorado Springs Municipal Airport to SEA. You'll have to book a flight with at least one stop. To get the best connections and price, lock in your airfare well ahead of time. ### Are Colorado Springs Airport (COS) to Seattle - Tacoma Intl. Airport (SEA) flight tickets cheaper when they're purchased at the last minute? > Last-minute planners can occasionally find a bargain, with some of the cheapest airfares from Colorado Springs Airport (COS) to SEA surfacing a few weeks before the date of departure. If you'd rather book ahead, Expedia compares and updates all the best flight deals frequently — as early as a year in advance in some cases. 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