UA8439 New YorkLGA · 19:45 MontréalYUL
UA8439 by United Airlines flies from New York (LGA) to Montréal (YUL).
scheduled from LGA
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 operation0 cancelled · 13 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at LGA and YUL 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 at New York
ForecastWed 11 Nov, local date
Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.
Tomorrow at Montréal
ForecastWed 11 Nov, local date
Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · 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 New York to Montréal flights today
same route · United AirlinesIf UA8439 is cancelled, this is the other United Airlines nonstop flight from New York to Montréal on the same day, with scheduled departure times in LGA 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 UA8439 actually runs
Pro Flight Search has tracked every published board update for UA8439 across the LGA and YUL boards: schedule changes, gate pushes and actual clocks. Usually departs ~8 min early. Based on 13 confirmed departures · 11/13 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how UA8439 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 LGA and YUL published them.
Planning around UA8439? 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: UA8439 New York to Montréal on-time performance, measured from the LGA and YUL airport boards.
https://proflightsearch.com/flight/UA8439
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