AirHint found the following cheapest return flights from Montreal (YUL) to London (LGW) in August 2025 (see full year).

Return flights

31 Aug - 07 Sep	Air Transat
31 Aug - 05 Sep	Air Transat
31 Aug - 11 Sep	Air Transat
31 Aug - 01 Sep	FrenchBee
30 Aug - 06 Sep	FrenchBee
28 Aug - 10 Sep	FrenchBee
28 Aug - 01 Sep	FrenchBee
28 Aug - 02 Sep	FrenchBee
30 Aug - 05 Sep	FrenchBee
29 Aug - 06 Sep	FrenchBee
28 Aug - 31 Aug	FrenchBee
28 Aug - 31 Aug	Air Transat	direct

Also check the deals for one-way flights from Montreal to London in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Montreal to London in August from $772

Return flights