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

Return flights

26 Aug - 09 Sep	SWISS
28 Aug - 18 Sep	Austrian Airlines
29 Aug - 31 Aug	Lufthansa
28 Aug - 31 Aug	Virgin Atlantic
28 Aug - 04 Sep	KLM
31 Aug - 10 Sep	British Airways	direct
29 Aug - 01 Sep	Air Canada
28 Aug - 01 Sep	Air Canada
30 Aug - 02 Sep	Lufthansa	direct
31 Aug - 13 Sep	Air Canada
31 Aug - 07 Sep	Lufthansa	direct
28 Aug - 04 Sep	Air Canada	direct
27 Aug - 31 Aug	Air Canada
27 Aug - 31 Aug	British Airways	direct
21 Aug - 27 Aug	SWISS
14 Aug - 28 Aug	SWISS
25 Aug - 31 Aug	Air Canada
13 Aug - 27 Aug	Air Canada
16 Aug - 31 Aug	Virgin Atlantic
17 Aug - 27 Aug	Virgin Atlantic

Also check the deals for one-way flights from London to Montreal 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 London to Montreal in August from $471

Return flights