YUL to LHR flight delays
503 flights · January 2025 – August 2026 · UK Civil Aviation Authority
69.65%
Arrived on time
Within 15 minutes of schedule
2.39%
Cancelled
Share of scheduled flights
—
When late, late by
Average across delayed arrivals
26 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In April it ran 33.9 points more punctual than in January — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The route has been getting better. The later months in the record run 11.3 points more punctual than the earlier ones, which usually means a schedule that was too tight has been given more room.
The two directions do not behave alike. LHR to YUL arrives on time 10.1 points more often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
Flights from Montréal to London run late more often than the average route, though not severely.
Which airline should you fly on this route?
Over January 2025 – August 2026, British Airways arrived on time most often on YUL to LHR. Air Canada was late most often. Flights ran closest to schedule in April and worst in January.
Every airline on YUL to LHR
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Air Canada | 301 | 68.26% | 2.66% | — | F |
| British Airways | 202 | 71.72% | 1.98% | — | D |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
LHR to YUL London back to Montréal 79.71% on time COther routes from Montréal
Common questions
Are flights from Montréal to London usually delayed?
69.65% of flights on the YUL to LHR route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airline is most on time from Montréal to London?
British Airways, at 71.72% on time across 202 flights. The least punctual on the route was Air Canada at 68.26%.
How often are YUL to LHR flights cancelled?
2.39% of scheduled flights did not operate — about 24 in every thousand. That is in the normal range.
What is the best month to fly Montréal to London?
April, when 87.3% of flights arrived on time. The worst was January at 53.4%.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on YUL to LHR during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →