Find cheap flights from Colorado to Seattle/Tacoma Airport

SEA

Find cheap flights from Colorado to Seattle/Tacoma Airport

Round-trip
Economy
Boston (BOS)
Seattle/Tacoma Intl
Fri 8/7
Fri 8/14
Any month
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Good to know

Low season

February Best time to beat the crowds with an average 4% drop in price.

High season

June Most popular time to fly with an average 14% increase in price.

Average price of a round-trip

$303 (avg. price over the last 2 weeks)

Good deal for a round-trip

$107 or less

FAQs for booking Colorado to Seattle/Tacoma Airport flights

Which airlines have a flexible cancellation policy for flights from Colorado to Seattle/Tacoma Intl due to COVID-19?

Which airlines apply social distancing measures on flights from Colorado to Seattle/Tacoma Intl due to COVID-19?

How does KAYAK find such low prices on flights from Colorado to Seattle/Tacoma Airport?

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

What is the Hacker Fare option on flights from Colorado to Seattle/Tacoma Airport?

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

Top 5 airlines serving Colorado to Seattle/Tacoma Intl

Scores according to KAYAK customer reviews

8.0
Delta
Overall score based on 28,502 reviews
8.2
Boarding
7.8
Comfort
8.5
Crew
7.8
Entertainment
7.5
Food
Airline reviews
Read more about Delta

Book cheap flights from Colorado to Seattle/Tacoma Airport

Recent round-trip flight deals

9/18
Fri
1 stop
Spirit Airlines
5h 22m
DEN - SEA
9/20
Sun
1 stop
Spirit Airlines
13h 14m
SEA - DEN
7/26
Sun
1 stop
Multiple Airlines
13h 23m
DEN - SEA
7/31
Fri
1 stop
Multiple Airlines
11h 46m
SEA - DEN
8/6
Thu
1 stop
Multiple Airlines
28h 57m
DEN - SEA
8/9
Sun
1 stop
Multiple Airlines
12h 04m
SEA - DEN
7/31
Fri
1 stop
Delta
4h 21m
COS - SEA
8/26
Wed
1 stop
Delta
4h 22m
SEA - COS
8/5
Wed
1 stop
Multiple Airlines
10h 42m
DEN - SEA
8/9
Sun
1 stop
Multiple Airlines
22h 45m
SEA - DEN
8/19
Wed
1 stop
Multiple Airlines
10h 42m
DEN - SEA
8/24
Mon
1 stop
Multiple Airlines
12h 11m
SEA - DEN
8/23
Sun
1 stop
Multiple Airlines
9h 41m
DEN - SEA
8/24
Mon
1 stop
Multiple Airlines
12h 11m
SEA - DEN
8/2
Sun
1 stop
Multiple Airlines
14h 57m
DEN - SEA
8/16
Sun
1 stop
Multiple Airlines
12h 04m
SEA - DEN
8/22
Sat
nonstop
Multiple Airlines
3h 02m
DEN - SEA
8/24
Mon
1 stop
Multiple Airlines
12h 11m
SEA - DEN
7/31
Fri
nonstop
Multiple Airlines
2h 55m
DEN - SEA
8/2
Sun
1 stop
Multiple Airlines
22h 31m
SEA - DEN
9/5
Sat
1 stop
Multiple Airlines
14h 57m
DEN - SEA
9/9
Wed
nonstop
Multiple Airlines
2h 47m
SEA - DEN
8/14
Fri
1 stop
Delta
6h 00m
GJT - SEA
8/18
Tue
1 stop
Delta
6h 17m
SEA - GJT
8/13
Thu
1 stop
Multiple Airlines
22h 34m
DEN - SEA
8/28
Fri
1 stop
Multiple Airlines
21h 18m
SEA - DEN
8/13
Thu
1 stop
Delta
4h 32m
COS - SEA
8/18
Tue
1 stop
Delta
4h 22m
SEA - COS
7/26
Sun
1 stop
Multiple Airlines
15h 07m
DEN - SEA
8/7
Fri
nonstop
Multiple Airlines
2h 41m
SEA - DEN
8/5
Wed
1 stop
Delta
6h 21m
COS - SEA
8/13
Thu
1 stop
Delta
4h 22m
SEA - COS
8/26
Wed
1 stop
Multiple Airlines
17h 05m
DEN - SEA
8/31
Mon
nonstop
Multiple Airlines
2h 39m
SEA - DEN
Show more results

Recent one-way flight deals

7/25
Sat
1 stop
Multiple Airlines
21h 34m
DEN - SEA
8/5
Wed
nonstop
Allegiant Air
2h 47m
DEN - SEA
8/2
Sun
2 stops
Spirit Airlines
30h 16m
DEN - SEA
8/5
Wed
1 stop
Delta
6h 09m
DEN - SEA
7/26
Sun
1 stop
Multiple Airlines
15h 07m
DEN - SEA
8/17
Mon
1 stop
Sun Country Air
11h 08m
DEN - SEA
7/25
Sat
1 stop
Cape Air
8h 15m
DEN - SEA
8/3
Mon
1 stop
Multiple Airlines
9h 44m
DEN - SEA
7/30
Thu
1 stop
Multiple Airlines
21h 37m
DEN - SEA
9/19
Sat
1 stop
Spirit Airlines
5h 22m
DEN - SEA
8/20
Thu
nonstop
Allegiant Air
2h 47m
DEN - SEA
7/30
Thu
1 stop
Multiple Airlines
21h 37m
DEN - SEA
8/20
Thu
1 stop
Allegiant Air
5h 40m
DEN - SEA
7/29
Wed
3 stops
Spirit Airlines
31h 39m
DEN - SEA
7/30
Thu
nonstop
Delta
2h 44m
DEN - SEA
9/5
Sat
1 stop
Multiple Airlines
14h 57m
DEN - SEA
8/21
Fri
1 stop
Delta
6h 21m
COS - SEA
8/13
Thu
1 stop
Spirit Airlines
21h 20m
DEN - SEA
8/20
Thu
1 stop
Multiple Airlines
14h 57m
DEN - SEA
7/30
Thu
1 stop
Delta
7h 49m
DEN - SEA
Show more results
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

We compile tonnes of data for you
Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
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