St Louis to Seattle (STL–SEA) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
STL–SEA is served by 1 airline with nonstop service. Alaska Airlines leads the route. The flight covers 1,705 miles in approximately 4h 29m. Beyond nonstop, 82 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| AS Alaska Airlines Also: HA, JL, QR | 28 | 739, 7M9, B39M | 4h29-4h32 | Oneworld | HA, JL, QR |
Weekly Schedule Pattern
Connection Landscape
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. With 49 weekly departures, this is a heavily served route.
STL to SEA Flight Duration and Schedule
Nonstop flight time from STL to SEA ranges from 4 hours 29 minutes to 4 hours 35 minutes. The route covers a distance of 1,705 miles (2,744 km). There are approximately 49 weekly flights outbound and 49 return, totaling 98 flights per week in both directions.
Connecting Options and Alternatives
82 one-stop connections are available, with the fastest taking approximately 6 hours via FXE. Two-stop connections are also available via intermediate hubs.