AS257: Alaska flight 257
Boston (BOS) → Seattle (SEA) · departs 6:20p, lands 9:44p local · Mon, Thu, Fri, Sun
The timetable below has every scheduled departure; for today's flight, check Alaska.
An estimate from the published timetable, not live tracking: it cannot know about delays, diversions or cancellations.
Live status at Alaska →The route
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AS257 timetable
Published departure and arrival times, each in its airport's local time, from the flights we sampled Nov 4–10.
| Route | Departs | Arrives | Scheduled | Days |
|---|---|---|---|---|
| BOS → SEABoston to Seattle | 4:33p | 7:57p | 6h24m | Sat |
| BOS → SEABoston to Seattle | 5:44p | 9:08p | 6h24m | Tue–Wed |
| BOS → SEABoston to Seattle | 6:20p | 9:44p | 6h24m | Mon, Thu, Fri, Sun |
Other nonstops from Boston to Seattle
The departures either side of AS257. Times are Boston time.
| Flight | Departs | Days |
|---|---|---|
| Delta DL384 | 7:55a | Daily |
| Alaska AS215 | 9:03a | Daily |
| Delta DL332 | 10:50a | Daily |
| This flight AS257 | 6:20p | Mon, Thu, Fri, Sun |
| Delta DL797 | 6:42p | Daily |
All 7 flights from BOS to SEA, by time →
Flying back from Seattle
Alaska flies Seattle to Boston nonstop 28 times a week, from 7:18a to 11:00p: 7:18a AS288 · 9:03a AS306 · 3:32p AS460 · 11:00p AS214 · every nonstop SEA → BOS →
How AS257 ran in our sample
5 of 7 departures left within 15 minutes of schedule (Nov 4–10). Only flights that departed are counted: cancellations are not in our data.
Aircraft: Boeing 737-900 on 4 of 7; also Boeing 737 MAX 9 (2), Boeing 737-800 (1).
What time does AS257 leave Boston?
AS257 is scheduled to depart Boston (BOS) at 4:33p (Sat), 5:44p (Tue–Wed), 6:20p (Mon, Thu, Fri, Sun), Boston time, and to land in Seattle (SEA) at about 7:57p local time, a scheduled 6h24m. Times are the published ones from the flights we sampled Nov 4–10; check Alaska for today's.
What plane is AS257?
Boeing 737-900 on 4 of the 7 AS257 flights from BOS we sampled Nov 4–10; the rest were a Boeing 737 MAX 9 or Boeing 737-800. Airlines swap aircraft, so the plane on a given day can differ.
Does AS257 fly every day?
Yes — AS257 flew Boston to Seattle every day of the week we sampled (Nov 4–10).
Is AS257 usually on time?
Of 7 AS257 departures from BOS we sampled Nov 4–10, 5 left within 15 minutes of the scheduled time. That counts only flights that departed — cancellations are not in our data — and one week is a small sample, so treat it as a hint, not a rating.
More Alaska flights from Boston
Timetable from Alaska departures we observed; AS257 is a Alaska Airlines flight number, and Hop Nonstop is not affiliated with Alaska. Schedules change — confirm with the airline before you travel.