June is the cheapest month to fly this route, with average fares around $251 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $287 | $234 | ||
| June 2026 | $251 | $231 | Best | |
| July 2026 | $317 | $317 | ||
| August 2026 | $317 | $317 | Peak |
Departing on Sunday offers the lowest average fares at $283. Friday departures are the most expensive at $291, a difference of $8.
The best time to fly is June. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Boston to Montreal is June, with average round-trip fares around $251. The lowest fare found in June is $231.
Sunday departures are the cheapest, averaging $283 round trip. The most expensive day is Friday at $291.
Based on current pricing trends, booking for June travel offers the best value. Avoid August if possible, as fares average $317 compared to $251 in the cheapest month. July is a solid middle-ground option at $317.
Flying in June instead of August can save you approximately $66 per round trip. The cheapest month averages $251 while the most expensive averages $317.
Airlines, flight times, price calendar, and more for Boston to Montreal
View BOS → YUL Details