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

Return flights

31 Aug - 07 Sep	British Airways
25 Aug - 07 Sep	Air Transat	direct
30 Aug - 08 Sep	Air France
21 Aug - 05 Sep	Air Transat	direct
14 Aug - 31 Aug	Air Transat	direct
04 Aug - 20 Aug	Air Transat	direct
04 Aug - 17 Aug	Air Transat	direct
04 Aug - 13 Aug	Air Transat	direct
14 Aug - 27 Aug	Air Transat	direct
13 Aug - 20 Aug	Lufthansa
10 Aug - 17 Aug	Air Canada
09 Aug - 22 Aug	Air Transat	direct
01 Aug - 10 Aug	SWISS
14 Aug - 21 Aug	Lufthansa
18 Aug - 01 Sep	Lufthansa

Also check the deals for one-way flights from Basel 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 Basel to Montreal in August from $539

Return flights