DL639 Los AngelesLAX · 06:40 BostonBOS · 15:18
DL639 by Delta Air Lines flies from Los Angeles (LAX) to Boston (BOS) for the Mon, Sep 7 departure.
estimated arrival at BOS · local time · ~94 min from now
position updated 5m ago · checking again in 90s
Live position · flown path, last 3h 30m
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 LAX and BOS 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 Los Angeles to Boston flights today
same route · Delta Air LinesIf DL639 is cancelled, these are the other Delta Air Lines nonstop flights from Los Angeles to Boston on the same day, with scheduled departure times in LAX local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How DL639 actually runs
Pro Flight Search has tracked every published board update for DL639 across the LAX and BOS boards: schedule changes, gate pushes and actual clocks. Usually lands ~15 min early. Based on 3 confirmed landings · 2/3 within 15 min of schedule. Pushes back late but makes up time in the air.
The verdict above is that record speaking, so it reflects how DL639 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: N712TW, N721TW.
Board clocks recorded as LAX and BOS published them.
Planning around DL639? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — DL639 Los Angeles to Boston on-time performance, measured from the LAX and BOS airport boards.
https://proflightsearch.com/flight/DL639
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