UA8400 MontréalYUL New YorkLGA · 21:30
UA8400 by United Airlines flies from Montréal (YUL) to New York (LGA).
tracked route YUL → 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 operationmedian arrival +39 min · 3 cancelled · 15 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at YUL and LGA 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 →
How UA8400 actually runs
Pro Flight Search has tracked every published board update for UA8400 across the YUL and LGA boards: schedule changes, gate pushes and actual clocks. Usually lands ~38 min late. Based on 11 confirmed landings · 4/11 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how UA8400 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 YUL and LGA published them.
Planning around UA8400? 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 — UA8400 Montréal to New York on-time performance, measured from the YUL and LGA airport boards.
https://proflightsearch.com/flight/UA8400
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