AS257Alaska Airlines · BOS → SEA
live · 14m ago
Route confirmed Alaska Airlines

AS257 BostonBOS · 18:20 SeattleSEA · 21:44

AS257 by Alaska Airlines flies from Boston (BOS) to Seattle (SEA) for the Thu, Nov 12 departure.

Right nowOn Time · gate B4
18:21

departs BOS · 1 min late

The route today

live boards
BOSBostonOn-time likelyBOS delay board →
SEASeattleModerate riskSEA delay board →
BOS→SEAevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
35%Chance of 15+ min delay
2.1%Chance of cancellation
+3 minTypical airport delay in this weather

Conditions at BOS and SEA are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records under conditions like today's, over the last 90 days.

Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →

Tomorrow at Boston

Forecast

Fri 13 Nov, local date

High8°Clikely 7°C to 10°C
Low5°Clikely 3°C to 7°C
  • 91% chance of rain

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

Tomorrow at Seattle

Forecast

Fri 13 Nov, local date

High13°Clikely 12°C to 15°C
Low10°Clikely 8°C to 12°C
  • 84% chance of rain

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other Boston to Seattle flights today

same route · Alaska Airlines
AS459departs 07:13
AS215departs 09:03
AS1506departs 15:26

If AS257 is cancelled, these are the other Alaska Airlines nonstop flights from Boston to Seattle on the same day, with scheduled departure times in BOS local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →

How AS257 actually runs

Pro Flight Search has tracked every published board update for AS257 across the BOS and SEA boards: schedule changes, gate pushes and actual clocks. Early read: no clear pattern yet. Only 2 completed legs so far: departed +11 min. Not enough to call it.

The verdict above is that record speaking, so it reflects how AS257 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocks

Board log

scheduled → actual, per operation
11-11BOS 17:44 18:00 (+16)SEA 21:08
11-10BOS 17:44 17:50 (+6)SEA 21:08

Board clocks recorded as BOS and SEA published them.

Planning around AS257? 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: AS257 Boston to Seattle on-time performance, measured from the BOS and SEA airport boards.

Canonical URL
https://proflightsearch.com/flight/AS257
How we measure this →