Beginning of main content
Trip Type
Flight 1
Flight 2
Flight 3
Flight 4
Flight 5
Due to coronavirus (COVID-19) travel advisories, some destinations may be unavailable for certain dates. Find out more.

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights


Amazing United COS to SEA Flight Deals

The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were $198 round trip and $88 one way. Prices and availability subject to change. Additional terms may apply.



FAQs about United Airlines Flights from COS to SEA

What terminal is United Airlines at Colorado Springs, CO (COS)?

Check your boarding pass to find out which Colorado Springs, CO (COS) terminal you'll be taking off from on your way to Seattle, WA (SEA-Seattle - Tacoma Intl.) with United Airlines. If you can't spot the information on there, ask your airline.

Are there United Airlines non-stop flights from COS to SEA?

Unfortunately, you won't find any direct flights between Colorado Springs, CO (COS) and Seattle, WA (SEA-Seattle - Tacoma Intl.) with United Airlines. Prepare to make a stopover if you have to stick to this route and airline.

How long is an United Airlines flight from COS to SEA?

As it'll take an average of 4 hours and 15 minutes for your United Airlines flight to get from Colorado Springs, CO (COS) to Seattle, WA (SEA-Seattle - Tacoma Intl.), consider throwing a travel game or two in your carry-on. You never know — the person next to you might welcome a challenge to break up the journey.

How many direct and indirect flights does United Airlines fly from COS to SEA?

United Airlines is currently operating roughly 4 flights each day from Colorado Springs, CO (COS) to Seattle, WA (SEA-Seattle - Tacoma Intl.).

If I am not able to travel due to COVID-19, can I change my booking to a later date?

For more info about changing your flight to Seattle, WA (SEA-Seattle - Tacoma Intl.), please visit our Customer Service Portal.

What is the best day to buy a plane ticket?

This just in! Airfares offered on Tuesdays tend to be the cheapest, according to flight demand on Travelocity in 2019. Wednesday and Friday prices are also good, but you may want to prepare your budget if booking on a Monday, as data shows the start of the week is when prices are generally at their highest.

What are the cheapest days to fly?

Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2019, flights departing on a Tuesday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.

How far in advance can you book a flight?

Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2019 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 1-2 weeks prior to their travel dates.

How can I save money on airline tickets?

We'll let you in on a secret...You can save big on flights if you mix and match your airlines and fare types. In fact, travelers who booked flights on Travelocity in 2019 saved nearly 50% when their return flights consisted of two different airlines or fare types.

*According to flight demand on Travelocity.com from January to December 2019. Savings are subject to change based on departure location, date and destination.

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.