St. LouisSeattleNonstop Flight TimeSTL–SEA
St. Louis (St. Louis Lambert International Airport) to Seattle (Seattle-Tacoma International Airport).
Direct flights from STL to SEA 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 06:00 to 19:56 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 STL to SEA
Our current provider sample includes 4/day direct flights from STL to SEA across 2 captured airlines. Captured departure terminal data is available for 1, 2.
- First departure
- 06:00
- Last departure
- 19:56
- Cadence
- ~every 2 hours
- Captured departures/day
- 10
| Airline | Captured daily freq. | Aircraft | Departures (local) |
|---|---|---|---|
| Alaska Airlines | 3/day | Boeing 737 · Terminal 1 · Seat map | 06:00 |
Aircraft on this route
Flying the other way?
SEA to STL flights — 4/day on 2 airlines →Methodology: airline, aircraft, terminal, and departure-time details come from the rolling scheduled-departures window for STL to SEA, 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 STL to SEA?
The STL to SEA flight time is estimated at about 4h 6m from great-circle distance until enough tracked flights are available.
How far is STL from SEA?
STL to SEA is about 1,705 miles by air.
Are there nonstop flights from STL to SEA?
Yes. Captured schedules show 4/day from STL to SEA on Alaska Airlines and Southwest Airlines. Confirm live timetables before booking.
Which airlines fly from STL to SEA?
Our current provider sample for STL to SEA includes Alaska Airlines, Southwest Airlines. Confirm live timetables before booking.
What aircraft fly from STL to SEA?
Aircraft captured in our current provider sample for STL to SEA include Boeing 737.