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

Return flights

22 Sep - 09 Oct	TAP	direct
29 Sep - 09 Oct	TAP	direct
30 Sep - 20 Oct	Air France
30 Sep - 22 Oct	Delta
03 Sep - 16 Oct	Air France
30 Sep - 08 Oct	Air France
16 Sep - 08 Oct	Air France
08 Sep - 16 Oct	Air France
30 Sep - 14 Oct	Air France
21 Sep - 07 Oct	Air France
19 Sep - 26 Sep	FrenchBee
21 Sep - 27 Sep	FrenchBee
08 Sep - 15 Sep	Air France
20 Sep - 27 Sep	Air Transat
12 Sep - 27 Sep	FrenchBee
15 Sep - 26 Sep	FrenchBee
10 Sep - 17 Sep	TAP	direct
16 Sep - 24 Sep	Air Transat
07 Sep - 26 Sep	FrenchBee
07 Sep - 27 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 454€

Return flights