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

Return flights

27 Aug - 10 Sep	Air Canada
27 Aug - 10 Sep	Air Canada	direct
17 Aug - 31 Aug	Air Canada
27 Aug - 24 Sep	Air Canada	direct
27 Aug - 27 Sep	Air Canada	direct
27 Aug - 09 Sep	Air Canada	direct
21 Aug - 03 Sep	TAP
22 Aug - 01 Sep	Air Canada
08 Aug - 23 Aug	Air Canada
14 Aug - 10 Sep	TAP
21 Aug - 02 Sep	TAP
18 Aug - 31 Aug	Air Canada
14 Aug - 10 Sep	Air Canada	direct
13 Aug - 30 Aug	Air Canada
15 Aug - 26 Aug	Air Canada
18 Aug - 28 Aug	Air Canada
19 Aug - 24 Aug	Air Canada
20 Aug - 27 Aug	Air Canada
19 Aug - 25 Aug	Air Canada
19 Aug - 26 Aug	Air Canada

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 513€

Return flights