DL4127 BoiseBOI · 17:59 SeattleSEA · 18:41
DL4127 by Delta Air Lines flies from Boise (BOI) to Seattle (SEA) for the Thu, Oct 29 departure.
arrival expected at SEA · 15 min early
board checked 32m ago · checking again in 45s
Where the minutes go
last 5 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The last 30 days
arrival outcome per operationmedian arrival −15 min · 0 cancelled · 5 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at BOI 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 on this route
ForecastBoise to Seattle with Delta Air Lines · Fri 30 Oct, local date
- Chance a departure leaves 60+ min late
- 8.6%0.9× usual
Forecast weather: 82% chance of rain at Seattle
No cancellation outlook here: this airport's board does not publish cancellations reliably.
Forecast: WeatherTomorrow · incl. data from ECMWF (CC BY 4.0, modified) · About 7 departures a day on this route with this airline. · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Boise to Seattle flights today
same route · Delta Air LinesIf DL4127 is cancelled, these are the other Delta Air Lines nonstop flights from Boise to Seattle on the same day, with scheduled departure times in BOI 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 DL4127 actually runs
Pro Flight Search has tracked every published board update for DL4127 across the BOI and SEA boards: schedule changes, gate pushes and actual clocks. Usually departs ~12 min late. Based on 5 confirmed departures · 5/5 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how DL4127 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, N312SY, N253SY, N315SY.
Board clocks recorded as BOI and SEA published them.
Planning around DL4127? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search: DL4127 Boise to Seattle on-time performance, measured from the BOI and SEA airport boards.
https://proflightsearch.com/flight/DL4127
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