DL3857 SpokaneGEG · 17:49 SeattleSEA · 19:14
DL3857 by Delta Air Lines flies from Spokane (GEG) to Seattle (SEA) for the Wed, Sep 9 departure.
estimated arrival at SEA · local time · past this estimate · waiting on the board
board checked 17m ago · checking again in 45s
Board estimate · gate and arrival times. Off blocks 18:22.
Where the minutes go
last 4 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at GEG and SEA are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, 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 →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Spokane to Seattle flights today
same route · Delta Air LinesIf DL3857 is cancelled, these are the other Delta Air Lines nonstop flights from Spokane to Seattle on the same day, with scheduled departure times in GEG local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How DL3857 actually runs
Pro Flight Search has tracked every published board update for DL3857 across the GEG and SEA boards: schedule changes, gate pushes and actual clocks. Usually departs ~33 min late. Based on 4 confirmed departures · 1/4 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how DL3857 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N293SY, N278SY.
Board clocks recorded as GEG and SEA published them.
Planning around DL3857? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — DL3857 Spokane to Seattle on-time performance, measured from the GEG and SEA airport boards.
https://proflightsearch.com/flight/DL3857
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