DL4 LondonLHR · 16:20 New YorkJFK · 19:40
DL4 by Delta Air Lines flies from London (LHR) to New York (JFK) for the Tue, Sep 8 departure.
arrival expected at JFK · 15 min early
board checked 2m ago · checking again in 45s
⚖ DL4 typically leaves +29 and lands −13. The air wins minutes back.Where the minutes go
last 7 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 −13 min · 0 cancelled · 14 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at LHR and JFK 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 London to New York flights today
same route · Delta Air LinesIf DL4 is cancelled, this is the other Delta Air Lines nonstop flight from London to New York on the same day, with scheduled departure times in LHR local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How DL4 actually runs
Pro Flight Search has tracked every published board update for DL4 across the LHR and JFK boards: schedule changes, gate pushes and actual clocks. Usually lands ~13 min early. Based on 13 confirmed landings · 10/13 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 DL4 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationBoard clocks recorded as LHR and JFK published them.
Planning around DL4? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — DL4 London to New York on-time performance, measured from the LHR and JFK airport boards.
https://proflightsearch.com/flight/DL4
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