Alaska Airlines flights from SEA to STL
Find comprehensive Alaska Airlines flight information, schedules, and booking details for direct flights from SEA to STL. Alaska Airlines operates 1-2 flights daily flights on this route.• Flight Duration: 3h 46m - 4h 11m (average flight time)• Daily Flights: 1-2 flights (scheduled departures per day)
SEA
STL
FLIGHT TIME
3h 46m - 4h 11m
3h 52m - 3h 54m
09:27
18:00
1 (Show)
7
Alaska Airlines Flight Schedule from SEA to STL
| Flight | Airline | Departure | Arrival | Aircraft |
|---|---|---|---|---|
AS388 |  Alaska Airlines | 09:27 | 15:19:00 | Boeing 737-900 (winglets) Passenger/BBJ3 |
AS472 | Alaska Airlines | 18:00 | 23:54:00 | Boeing 737-900 (winglets) Passenger/BBJ3 |
Alaska Airlines Monthly Flight Calendar
December 2025
Route Insights
Duration variability: Flight duration on this route can vary based on aircraft type, wind conditions, and airline scheduling. Average duration is 3h 46m - 4h 11m.
Best departure times: Peak departure times are 9:00, 18:00, offering more flight options and potentially better connections.
SEA - STL flight price statistics
$447
ApproximateThe numbers are average prices found based on user searches for direct flights between the airports. It's calculated from the cheapest prices found per month for a round-trip with 1 adult and can vary depending on the amount of data we have for this particular route.
$216
Jan$415
Feb$270
Mar$304
Apr$428
May$808
Jun$646
Jul$618
Aug$356
Sep$346
Oct$278
Nov$678
DecAlaska Airlines Terminal Information
Terminal information for Alaska Airlines on this route is currently being updated. Please check back soon or contact the airports directly for terminal details.
Frequently Asked Questions about Alaska Airlines Flights
How many Alaska Airlines flights operate from SEA to STL?
Alaska Airlines operates 2 flights from SEA to STL.
What city does STL airport serve?
STL airport serves Saint Louis.
How long is the Alaska Airlines flight from SEA to STL?
The flight duration is approximately 3h 46m - 4h 11m.
What aircraft does Alaska Airlines use on this route?
Alaska Airlines uses Boeing 737-900 (winglets) Passenger/BBJ3 on this route.
What are the earliest and latest Alaska Airlines flight departure times?
The earliest Alaska Airlines flight departs at 09:27 and the latest departs at 18:00.
What is the average price for a Alaska Airlines flight from SEA to STL?
The average price for a round-trip Alaska Airlines flight on this route is approximately $447. Prices can vary based on booking time and demand.
How many Alaska Airlines flights operate per week on this route?
Alaska Airlines operates approximately 7 flights per week from SEA to STL.