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

Return flights

05 Oct - 15 Oct	American Airlines
21 Oct - 20 Nov	Air Transat	direct
21 Oct - 17 Nov	Air Transat	direct
12 Oct - 05 Nov	Air Transat
06 Oct - 20 Oct	Air France
07 Oct - 22 Oct	Air France
07 Oct - 23 Oct	Air France
27 Oct - 05 Nov	Air France
06 Oct - 22 Oct	Delta
07 Oct - 21 Oct	Air France
20 Oct - 07 Nov	Delta
17 Oct - 22 Oct	British Airways
20 Oct - 30 Oct	British Airways
28 Oct - 04 Nov	British Airways
27 Oct - 03 Nov	British Airways
21 Oct - 22 Nov	British Airways
14 Oct - 20 Oct	KLM
01 Oct - 20 Oct	KLM
16 Oct - 08 Nov	British Airways
09 Oct - 07 Nov	Delta

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

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 October from 288€

Return flights