YYC to LHR flight delays
211 flights · January 2025 – August 2026 · UK Civil Aviation Authority
78.95%
Arrived on time
Within 15 minutes of schedule
0.95%
Cancelled
Share of scheduled flights
—
When late, late by
Average across delayed arrivals
13 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 60.7 points more punctual than in February — 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 17.8 points more punctual than the earlier ones, which usually means a schedule that was too tight has been given more room.
Only Air Canada flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
This is a thin route — 211 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
Which airline should you fly on this route?
Over January 2025 – August 2026, Air Canada arrived on time most often on YYC to LHR. Flights ran closest to schedule in April and worst in February.
Every airline on YYC 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 | 211 | 78.95% | 0.95% | — | C |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
LHR to YYC London back to Calgary 77.62% on time CCommon questions
Are flights from Calgary to London usually delayed?
78.95% of flights on the YYC to LHR route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airlines fly from Calgary to London?
Only Air Canada appears in the published record on this route, with 211 flights and 78.95% arriving on time.
How often are YYC to LHR flights cancelled?
0.95% of scheduled flights did not operate — about 10 in every thousand. That is in the normal range.
What is the best month to fly Calgary to London?
April, when 100% of flights arrived on time. The worst was February at 39.3%.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on YYC 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 →