DL4 LondonLHR · 16:35 New YorkJFK · 20:59
DL4 by Delta Air Lines flies from London (LHR) to New York (JFK) for the Sat, Oct 31 departure.
estimated arrival at JFK · local time · ~4h 20m from now
board checked 12m ago · checking again in 45s
Board estimate · gate and arrival times. Off blocks 17:09 · typical taxi-out at LHR ≈ 12.8 min. No receiver coverage over open ocean.
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 −8 min · 0 cancelled · 13 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. 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
ForecastLondon to New York with Delta Air Lines · Sun 1 Nov, local date
- Chance a departure is cancelled
- 1.4%0.8× usual
- Chance a departure leaves 60+ min late
- 9.2%1.1× usual
Forecast weather: 70% chance of fog at London
Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · About 2 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 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 that show a delay still operate. Rebooking usually helps only when that delay is very large. 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 ~7 min early. Based on 12 confirmed landings · 10/12 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 operationAircraft
Recent tails: N827MH.
Board 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
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
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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