May is the cheapest month to fly this route, with average fares around $574 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $574 | $550 | Best | |
| June 2026 | $632 | $550 | ||
| July 2026 | $740 | $700 | Peak | |
| August 2026 | $706 | $703 |
Departing on Thursday offers the lowest average fares at $659. Sunday departures are the most expensive at $680, a difference of $21.
The best time to fly is May. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Montreal to London is May, with average round-trip fares around $574. The lowest fare found in May is $550.
Thursday departures are the cheapest, averaging $659 round trip. The most expensive day is Sunday at $680.
Based on current pricing trends, booking for May travel offers the best value. Avoid July if possible, as fares average $740 compared to $574 in the cheapest month. August is a solid middle-ground option at $706.
Flying in May instead of July can save you approximately $166 per round trip. The cheapest month averages $574 while the most expensive averages $740.
Airlines, flight times, price calendar, and more for Montreal to London
View YUL → LHR Details