Flights Seattle → Boston
SEA → BOS
How long is the flight from Seattle to Boston?
The flight from Seattle (SEA) to Boston (BOS) takes 4h 49m on average. That is the median time recorded across 5 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 Boston operates with a high level of punctuality, with 77% of flights arriving on time. Over the past year, there have been 473 total flights on this route, each averaging a delay of 14.3 minutes. The aircraft used include Boeing 737 and Airbus A320 models, serving one of the busiest airports in terms of annual passenger traffic with over 36 million passengers.
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) → Boston (BOS) route is operated by American Airlines, Alaska Airlines, JetBlue Airways. Across 1571 flights monitored in recent months, 73% arrived on time (within 15 min of schedule), with an average delay of 18 minutes. The cancellation rate is 2.10%. FlightGuard's average computed risk is 27.1/100 (medium), updated in real time from weather, ATC delays, strikes, NOTAMs, fuel and flight history. At Boston the average ATFM delay is 5.5 minutes (main cause: atfm). Departing from Seattle the average ATFM delay is 5.5 minutes.
Heading to Boston: what to expect in this direction
Flying from Seattle (SEA) to Boston (BOS) heads east for about 4,006 km, a flight time of roughly 4h 49m.
Departures from Seattle on this leg cluster in the overnight window: about 45% of SEA-BOS flights take off then.
Air-traffic congestion: departing Seattle the average ATFM delay is 5.5 min (atfm); arriving into Boston it is 5.5 min (atfm).
Across 1,571 tracked SEA-BOS flights, 73% left on time with an average delay of 18 min and a 2.1% 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 SEA-BOS
Airports
Frequently asked questions about SEA-BOS
The flight from Seattle (SEA) to Boston (BOS) takes 4h 49m on average. That is the median time recorded across 5 scheduled flights on this leg; the actual time varies by a few minutes with wind, routing and take-off queues.
On the Seattle (SEA) -> Boston (BOS) route, on-time performance is 73% with an average delay of 18 minutes, based on 1571 tracked flights.
The cancellation rate on Seattle-Boston is 2.10% across 1571 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 Boston, 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.
