SeattleSt. LouisNonstop Flight TimeSEA–STL
Seattle (Seattle-Tacoma International Airport) to St. Louis (St. Louis Lambert International Airport).
Direct flights from SEA to STL have an estimated flight time of about 4h 6m, based on the 1,705-mile great-circle distance. Our current captured departure sample includes 4/day across 2 captured airlines, with Alaska Airlines appearing most often in that sample. Captured departure times run from 07:55 to 18:04 local time.
Plan this routeAt a glance
| Est. flight time | Distance | Route type | Captured freq. | Market |
|---|---|---|---|---|
| ~4h 6m Estimated from great-circle distance — no tracked flights yet. | 1,705 mi | Nonstop | 4/day From the current provider sample; confirm live timetables before booking. | Domestic |
Airlines on this route
Captured nonstop airlines for SEA to STL
Our current provider sample includes 4/day direct flights from SEA to STL across 2 captured airlines.
- First departure
- 07:55
- Last departure
- 18:04
- Cadence
- ~hourly
- Captured departures/day
- 10
| Airline | Captured daily freq. | Aircraft | Departures (local) |
|---|---|---|---|
| Alaska Airlines | 3/day | Boeing 737 · Seat map | 07:5509:1712:45 |
Aircraft on this route
Flying the other way?
STL to SEA flights — 4/day on 2 airlines →Methodology: airline, aircraft, terminal, and departure-time details come from the rolling scheduled-departures window for SEA to STL, last seen June 15, 2026. Frequency uses 28 scheduled departures across 7 observed days; flight time is estimated from great-circle distance until this route has enough tracked flights for an observed average. Provider coverage can miss operators on some routes, so confirm live timetables before booking.
Route FAQ
How long is the flight from SEA to STL?
The SEA to STL flight time is estimated at about 4h 6m from great-circle distance until enough tracked flights are available.
How far is SEA from STL?
SEA to STL is about 1,705 miles by air.
Are there nonstop flights from SEA to STL?
Yes. Captured schedules show 4/day from SEA to STL on Alaska Airlines and Southwest Airlines. Confirm live timetables before booking.
Which airlines fly from SEA to STL?
Our current provider sample for SEA to STL includes Alaska Airlines, Southwest Airlines. Confirm live timetables before booking.
What aircraft fly from SEA to STL?
Aircraft captured in our current provider sample for SEA to STL include Boeing 737.