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

Return flights

28 Aug - 18 Sep	Air France
30 Aug - 03 Sep	British Airways
24 Aug - 01 Sep	SWISS
28 Aug - 31 Aug	Air France
28 Aug - 31 Aug	Air Transat	direct
30 Aug - 03 Sep	Air Transat	direct
21 Aug - 27 Aug	Air France
23 Aug - 31 Aug	Air Dolomiti
23 Aug - 13 Sep	Air Dolomiti
26 Aug - 29 Aug	Air France
23 Aug - 31 Aug	Air Transat	direct
18 Aug - 01 Sep	Lufthansa
21 Aug - 27 Aug	Air Transat	direct

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 449€

Return flights