
Most accurate provider | Mytrip 3 stars |
|---|---|
Most trusted provider | Mytrip 3 stars |
Round-trip from | $78 (Expedia) |
One-way from | $37 (Kiwi.com) |
Popular in | December |
Cheapest in | January |
Average price | $255 |
Fly from
Fly to
Route
Depart
Return
Price
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 2/20
7:40 pm-11:25 pm
Nonstop2h 45m
Denver Intl
Tue 2/24
6:50 pm-9:08 pm
Nonstop3h 18m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 2/4
5:15 am-12:25 pm
1 stop6h 10m
Denver Intl
Thu 2/5
8:20 am-10:25 am
Nonstop3h 05m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 2/24
5:40 pm-9:23 pm
Nonstop2h 43m
Denver Intl
Wed 2/25
12:34 pm-2:41 pm
Nonstop3h 07m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 1/21
1:45 pm-5:34 pm
Nonstop2h 49m
Denver Intl
Wed 1/28
6:50 pm-9:10 pm
Nonstop3h 20m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 2/19
7:40 pm-11:25 pm
Nonstop2h 45m
Denver Intl
Mon 2/23
6:40 am-8:51 am
Nonstop3h 11m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 2/6
1:45 pm-5:34 pm
Nonstop2h 49m
Denver Intl
Sat 2/7
6:50 pm-9:10 pm
Nonstop3h 20m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 2/18
7:40 pm-11:25 pm
Nonstop2h 45m
Denver Intl
Fri 2/27
6:20 pm-12:09 am
1 stop6h 49m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 1/30
6:05 am-9:40 am
Nonstop2h 35m
Denver Intl
Mon 2/2
6:20 am-12:20 pm
1 stop7h 00m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 1/23
4:33 pm-11:58 pm
1 stop6h 25m
Denver Intl
Sun 1/25
7:00 am-9:11 am
Nonstop3h 11m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 1/30
5:00 am-11:51 am
1 stop5h 51m
Denver Intl
Mon 2/2
6:23 pm-12:09 am
1 stop6h 46m
Booking 69 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Boulder. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Currently, January is the cheapest month in which you can book a flight from Seattle to Boulder (average of $37). Flying from Seattle to Boulder in July is currently the most expensive (average of $100). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
Unlike at noon, when flights are generally more expensive, you can save up to 36% on flights from Seattle to Boulder by exploring options for tickets in the evening.
Travelers seeking maximum savings on their Seattle to Boulder flight should consider departing on Monday mornings when fares are most often at their lowest. Tuesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from SEA to BD9 are scheduled on a Thursday (35 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (11 on average).
Crew
Overall
Food
Boarding
Comfort
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
Crew
Overall
Food
Boarding
Comfort
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
Crew
Overall
Food
Boarding
Comfort
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
Crew
Overall
Food
Boarding
Comfort
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
Crew
Overall
Food
Boarding
Comfort
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
Crew
Overall
Food
Boarding
Comfort
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$63 | Average$167 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$87 | Average$233 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$110 | Average$251 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$134 | Average$314 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$143 | Average$295 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$148 | Average$385 | FlexibilityNo cancel fee | On-time69% |