Flights Boston → Seattle
BOS → SEA
How long is the flight from Boston to Seattle?
The flight from Boston (BOS) to Seattle (SEA) takes 5h 31m on average. That is the median time recorded across 3 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 Boston to Seattle operates with a high on-time performance rate of 84%, with an average delay of just 8.5 minutes per flight. Over the course of a year, approximately 472 flights connect these two cities using Boeing 737 and Airbus A320 aircraft, serving one of the busiest destination airports in the United States, which sees over 52 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 Boston (BOS) → Seattle (SEA) route is operated by American Airlines, Alaska Airlines, JetBlue Airways. Across 1535 flights monitored in recent months, 79% arrived on time (within 15 min of schedule), with an average delay of 13 minutes. The cancellation rate is 1.69%. FlightGuard's average computed risk is 24.8/100 (medium), updated in real time from weather, ATC delays, strikes, NOTAMs, fuel and flight history. At Seattle the average ATFM delay is 5.5 minutes (main cause: atfm). Departing from Boston the average ATFM delay is 5.5 minutes.
Heading to Seattle: what to expect in this direction
Flying from Boston (BOS) to Seattle (SEA) heads north-west for about 4,006 km, a flight time of roughly 5h 31m.
Departures from Boston on this leg cluster in the overnight window: about 44% of BOS-SEA flights take off then.
Air-traffic congestion: departing Boston the average ATFM delay is 5.5 min (atfm); arriving into Seattle it is 5.5 min (atfm).
Across 1,535 tracked BOS-SEA flights, 79% left on time with an average delay of 13 min and a 1.7% 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% |
| JetBlue Airways (B6) | 79% | 7 min | 0.1% |
Airlines operating BOS-SEA
Airports
Frequently asked questions about BOS-SEA
The flight from Boston (BOS) to Seattle (SEA) takes 5h 31m on average. That is the median time recorded across 3 scheduled flights on this leg; the actual time varies by a few minutes with wind, routing and take-off queues.
On the Boston (BOS) -> Seattle (SEA) route, on-time performance is 79% with an average delay of 13 minutes, based on 1535 tracked flights.
The cancellation rate on Boston-Seattle is 1.69% across 1535 monitored flights.
The route is operated by 3 airlines: American Airlines, Alaska Airlines, JetBlue Airways.
Enter your flight number on FlightGuard for a real-time analysis based on 9 factors: weather at Seattle, 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.
