AirHint found the following cheapest return flights from Montreal (YUL) to Lisbon (LIS) in September 2025 (see full year).

Return flights

21 Sep - 23 Sep	Air Transat	direct
22 Sep - 30 Sep	Air Transat	direct
21 Sep - 30 Sep	Air Transat	direct
21 Sep - 22 Sep	Air Transat	direct
29 Sep - 08 Oct	FrenchBee
24 Sep - 01 Oct	TAP	direct
17 Sep - 08 Oct	FrenchBee
29 Sep - 06 Oct	FrenchBee
22 Sep - 06 Oct	FrenchBee
29 Sep - 01 Oct	Air Transat	direct
24 Sep - 02 Oct	Air Transat
21 Sep - 26 Sep	FrenchBee
22 Sep - 13 Oct	FrenchBee
22 Sep - 06 Oct	Air Transat	direct
29 Sep - 06 Oct	Air Transat	direct
23 Sep - 30 Sep	SWISS
22 Sep - 29 Sep	Air Transat	direct
17 Sep - 24 Sep	FrenchBee
19 Sep - 25 Sep	FrenchBee
17 Sep - 26 Sep	FrenchBee

Also check the deals for one-way flights from Montreal to Lisbon in September.

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 Lisbon in September from 418€

Return flights