Alaska AirlinesAS
Flights AS459 07:03 daily · AS215 09:03 daily · AS288 16:58 daily · AS306 18:40 daily
live
Direct flights from Boston (BOS) to Seattle (SEA): 21 nonstop departures observed each week across 3 airlines. 60% of the last 5 operated flights arrived within 15 minutes of schedule. The median arrival is 13 minutes late. No cancellations were recorded across the 5 tracked flights. The nonstop covers 4,006 km, an estimated 5 hours 38 minutes in the air. Measured by Pro Flight Search from live flight boards at Boston and Seattle. Updated 15 October 2026 at 06:52 UTC.
Today, BOS → SEA
Thu 15 Oct · local times- 07:03 AS459Alaska Est. 06:58Gate B4 · TB ·
- 07:55 DL384Delta On scheduleGate A19 · TA ·
- 09:03 AS215Alaska Est. 08:58Gate B4 · TB ·
- 10:50 DL332Delta On scheduleGate A15 · TA ·
Checked BOS board 02:52 · SEA board 23:22
BOS
Boston
busy · +22
SEA
Seattle
smooth · +0
4,006 km · ~5h 38m est.
Runs mixed · 3 airlines · 21x weekly · nonstop
60% on time
of the last 5 operated BOS → SEA flights arrived within 15 minutes
Median arrival delay is +13 min. 0 of 5 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+13 minacross the last 5 operated legs
Flight time~5h 38mestimated from route distance
Weekly departures21x3 direct airlines on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Alaska AirlinesDelta Air LinesJetBlue Airways
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Current conditions put the pressure at BOS: 42% odds of a 15+ minute delay and around +10 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the Boston to Seattle route actually runs
Pro Flight Search records official board updates for nonstop BOS to SEA flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search — Boston (BOS) to Seattle (SEA) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/BOS-SEA
BOS to SEA questions
Is BOS–SEA running on time right now?
Smooth skies ahead. The departure side at BOS is the weaker end, route health score 85/100. The airports section above carries the live status and delay window at both ends.
Morning or evening flight on BOS–SEA?
Operators schedule morning departures around 07:03 and evening departures around 18:40 from BOS. Earlier flights typically land before destination-airport delays accumulate later in the day; check the SEA delay card to confirm conditions when you'd arrive.
How long is the flight from BOS to SEA?
Great-circle distance is 4,006 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 313–373 min gate-to-gate on this route.
How often does BOS–SEA fly?
3 carriers operate this route, around 62 flights a week between them. Compare carrier days and times in the airline list above.
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