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

Return flights

20 Oct - 11 Nov	Finnair
14 Oct - 23 Oct	Finnair
07 Oct - 23 Oct	Finnair
20 Oct - 13 Nov	Finnair
20 Oct - 10 Nov	Finnair
15 Oct - 23 Oct	Finnair
09 Oct - 23 Oct	Finnair
06 Oct - 23 Oct	Finnair
19 Oct - 18 Nov	Finnair
19 Oct - 11 Nov	Finnair
18 Oct - 19 Nov	Finnair
08 Oct - 20 Nov	Finnair
12 Oct - 06 Nov	Finnair
18 Oct - 06 Nov	Finnair
18 Oct - 10 Nov	Finnair
02 Oct - 09 Oct	Finnair
12 Oct - 22 Oct	British Airways
01 Oct - 22 Oct	British Airways
08 Oct - 22 Oct	British Airways
16 Oct - 22 Oct	British Airways

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 $250

Return flights