Cheap flights from St. Louis, MO to Seattle, WA

Flights starting at $89. Choose between Alaska Airlines, Frontier Airlines, or United Airlines to find the best price.

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Tips to know when travelling to Seattle

Book your trip to arrive at Seattle–Tacoma International, Kenmore Air Harbor Seaplane Base, Seattle, WA - University of Washington, or Seattle WA - South Lane St. Bus Stop. The distance between St. Louis and Seattle is 2747 km. The most popular airlines for this route are Alaska Airlines, Frontier Airlines, United Airlines, Spirit Airlines, and Harbour Air (Priv). St. Louis and Seattle have 180 direct flights per week.

Weekly direct flights

Discover the top airlines offering direct flights from St. Louis to Seattle in the next month. You’ll find the number of daily direct flights per airline in the table.

Weekly direct flights for Sun 18.02 - Sat 24.02

AirlineSun 18.02Mon 19.02Tue 20.02Wed 21.02Thu 22.02Fri 23.02Sat 24.02
2211221

Weekly direct flights for Sun 25.02 - Sat 02.03

AirlineSun 25.02Mon 26.02Tue 27.02Wed 28.02Thu 29.02Fri 01.03Sat 02.03
2211221

Weekly direct flights for Sun 03.03 - Sat 09.03

AirlineSun 03.03Mon 04.03Tue 05.03Wed 06.03Thu 07.03Fri 08.03Sat 09.03
2211221

Weekly direct flights for Sun 10.03 - Sat 16.03

AirlineSun 10.03Mon 11.03Tue 12.03Wed 13.03Thu 14.03Fri 15.03Sat 16.03
2211222

Check-in for a flight from St. Louis to Seattle

NameCarrier codeIATA CodePassport needed during bookingOnline check-in available
Alaska AirlinesASAASNoOpens 24 days before flight
Closes 1 hours before flight
Frontier AirlinesFFTF9NoOpens 24 days before flight
Closes 1 hours before flight
United AirlinesUALUAYesNo
Spirit AirlinesNKSNKNoOpens 24 days before flight
Closes 1 hours before flight
Harbour Air (Priv)HESYBNoNo

Weather in Seattle

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January7°C2°C
February8°C1°C
March10°C3°C
April13°C4°C
May18°C8°C
June21°C10°C
July25°C13°C
August26°C14°C
September22°C11°C
October15°C7°C
November10°C4°C
December6°C1°C
Hottest Month
26°C
August
Coldest month
1°C
February
Sunny days
250
days per year
Snow days
5
days per year

14 day forecast

Sunday
25 Feb
98%
9°C3°C
3 Mar
8°C0°C
Monday
26 Feb
93%
6°C0°C
4 Mar
87%
5°C1°C
Tuesday
27 Feb
87%
4°C-1°C
5 Mar
89%
7°C4°C
Wednesday
28 Feb
77%
8°C4°C
6 Mar
89%
7°C3°C
Thursday
29 Feb
81%
6°C2°C
7 Mar
84%
7°C1°C
Friday
1 Mar
74%
8°C1°C
8 Mar
79%
9°C2°C
Saturday
2 Mar
86%
6°C0°C
9 Mar
86%
10°C4°C

Frequently asked questions

How long does it take to travel from St. Louis to Seattle?
What is the flight distance between St. Louis and Seattle?
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