St Louis to Seattle (STL–SEA) — Airlines, Schedules & Connections
No flights match your filters.
No scheduled airline flights on this route — it's flown by charter / private operators (). No nonstop flights on this route. connecting options below.
Most recently operated nonstop flights — the month shown is when each was last scheduled. Most destinations remain reachable with a connection.
No discontinued nonstop flights on record for this route.
STL–SEA is served by 2 airlines with nonstop service. Alaska Airlines and Southwest Airlines lead the route. The flight covers 1,705 miles in approximately 4h 23m. Beyond nonstop, 1-stop connecting options are also available.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| AS Alaska Airlines Also: HA, JL, QR | 32 | 7M9, B39M | 4h03-4h28 | Oneworld | HA, JL, QR | |
| WN Southwest Airlines | 11 | 73H, 7M8 | 4h-4h20 | – | – |
Weekly Schedule Pattern
Connection Landscape
On-Time Performance
Travel Essentials
STL: CDT · SEA: PDT
When it's 6:00 PM in St Louis, it's 4:00 PM in Seattle.
Link Light Rail from the airport station (inside the terminal) to downtown Seattle takes 38 minutes ($3.50). No transfers needed; trains run 5am to 1am daily.Taxis and ride-shares to downtown cost $35–55. For Bellevue and Eastside destinations (across Lake Washington), ride-share is faster than Link. Car rentals are in the consolidated rental facility; take the free shuttle from baggage claim. Sound Transit buses serve Tacoma, Renton, and Federal Way.
Marine west coast climate. Winters are mild but persistently grey and rainy (3–9°C). Snow is rare at sea level but can occur December through February, causing significant disruptions when it does. The airport sits between Seattle and Tacoma in an area that receives more fog and low cloud than downtown Seattle.
Summers are famously pleasant (18–25°C) with low humidity and mostly clear skies, one of the best flying climates in the US from June through September. The wettest months are November through January.
STL–SEA Quick Facts
Frequently Asked Questions
Flights from STL to SEA
St. Louis Lambert International Airport (STL) and Seattle–Tacoma International Airport (SEA) are connected by nonstop service from Alaska Airlines and Southwest Airlines. With 54 weekly departures, this is a heavily served route.
STL to SEA Flight Duration and Schedule
Nonstop flight time from STL to SEA is about 4 hours 23 minutes gate to gate. The route covers a distance of 1,705 miles (2,744 km). There are approximately 54 weekly flights outbound and 72 return, totaling 126 flights per week in both directions.
Connecting Options and Alternatives
1-stop connecting options are also available, commonly via Denver, Portland and Minneapolis–Saint Paul. Two-stop connections are also available via intermediate hubs.