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

Return flights

26 Dec - 16 Jan	Finnair
11 Dec - 22 Dec	Lufthansa
14 Dec - 14 Jan	TAP	direct
03 Dec - 10 Dec	TAP	direct
07 Dec - 14 Dec	TAP	direct
10 Dec - 14 Dec	TAP	direct
03 Dec - 17 Dec	TAP	direct
08 Dec - 15 Dec	TAP	direct
10 Dec - 17 Dec	TAP	direct
12 Dec - 19 Dec	TAP	direct
12 Dec - 28 Dec	TAP	direct
31 Dec - 16 Jan	TAP	direct
31 Dec - 21 Jan	TAP	direct
04 Dec - 11 Dec	British Airways
27 Dec - 15 Jan	British Airways
27 Dec - 14 Jan	British Airways
28 Dec - 29 Jan	British Airways
28 Dec - 15 Jan	British Airways
30 Dec - 20 Jan	British Airways
04 Dec - 28 Jan	British Airways

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

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 December from $389

Return flights