Flights Seattle → St. Louis
SEA → STL
How long is the flight from Seattle to St. Louis?
The flight from Seattle (SEA) to St. Louis (STL) takes 3h 36m on average. That is the median time recorded across 2 scheduled flights on this leg; the actual time varies by a few minutes with wind, routing and take-off queues.
Route overview
The flight route from Seattle to St. Louis operates with a high level of punctuality, boasting an on-time performance rate of 96%. Over the past year, there have been 150 flights along this route, each typically using a Boeing 737 aircraft, and arriving at Lambert-St. Louis International Airport, which serves over 13 million passengers annually.
Your rights on this US flight (DOT)
US flights have no statutory cash compensation for delays. Under the US DOT rules, if your flight is cancelled or significantly changed and you decline rebooking, you're owed an automatic refund of the unused ticket. The tarmac-delay limit is 3 hours (domestic) / 4 hours (international). Amenities for controllable delays depend on each airline's contract of carriage.
US flight refund rules & checker →General information, not legal advice.
The Seattle (SEA) → St. Louis (STL) route is operated by American Airlines, Alaska Airlines. Across 543 flights monitored in recent months, 86% arrived on time (within 15 min of schedule), with an average delay of 5 minutes. The cancellation rate is 1.29%. FlightGuard's average computed risk is 20.1/100 (medium), updated in real time from weather, ATC delays, strikes, NOTAMs, fuel and flight history. At St. Louis the average ATFM delay is 5.5 minutes (main cause: atfm). Departing from Seattle the average ATFM delay is 5.5 minutes.
Heading to St. Louis: what to expect in this direction
Flying from Seattle (SEA) to St. Louis (STL) heads east for about 2,744 km, a flight time of roughly 3h 36m.
Departures from Seattle on this leg cluster in the overnight window: about 55% of SEA-STL flights take off then.
Air-traffic congestion: departing Seattle the average ATFM delay is 5.5 min (atfm); arriving into St. Louis it is 5.5 min (atfm).
Across 543 tracked SEA-STL flights, 86% left on time with an average delay of 5 min and a 1.3% cancellation rate.
Route facts
Flights on this route
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Airline punctuality on this route
| Airline | On-time | Average delay | Cancellations |
|---|---|---|---|
| Alaska Airlines (AS) | 85% | -1 min | 0.5% |
| American Airlines (AA) | 79% | 6 min | 1.1% |
Airlines operating SEA-STL
Airports
Frequently asked questions about SEA-STL
The flight from Seattle (SEA) to St. Louis (STL) takes 3h 36m on average. That is the median time recorded across 2 scheduled flights on this leg; the actual time varies by a few minutes with wind, routing and take-off queues.
On the Seattle (SEA) -> St. Louis (STL) route, on-time performance is 86% with an average delay of 5 minutes, based on 543 tracked flights.
The cancellation rate on Seattle-St. Louis is 1.29% across 543 monitored flights.
The route is operated by 2 airlines: American Airlines, Alaska Airlines.
Enter your flight number on FlightGuard for a real-time analysis based on 9 factors: weather at St. Louis, ATC delays, strikes, NOTAMs, fuel, airline punctuality and recent trends.
US flights have no statutory cash compensation for delays. Under US DOT rules, if the airline cancels or significantly changes your flight and you decline rebooking, you're owed an automatic refund of the unused ticket. The tarmac-delay limit is 3 hours (domestic) / 4 hours (international). Meals or hotels for controllable delays depend on each airline's contract of carriage.
