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

Return flights

14 Oct - 06 Nov	SWISS
15 Oct - 05 Nov	Air Transat
22 Oct - 05 Nov	Air Transat
27 Oct - 05 Nov	Air Transat
01 Oct - 29 Oct	Air Transat
22 Oct - 29 Oct	Air Transat
12 Oct - 23 Oct	Air Transat
05 Oct - 12 Oct	FrenchBee
01 Oct - 14 Oct	Delta
05 Oct - 14 Oct	Delta
07 Oct - 22 Oct	Delta
05 Oct - 22 Oct	Delta
19 Oct - 06 Nov	Air Canada
01 Oct - 22 Oct	FrenchBee
09 Oct - 24 Oct	Delta
19 Oct - 07 Nov	Air France
20 Oct - 10 Nov	Delta
22 Oct - 17 Nov	Delta
09 Oct - 07 Nov	Delta
22 Oct - 08 Nov	Air Transat	direct

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 249€

Return flights