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

Return flights

05 Dec - 10 Dec	Finnair
03 Dec - 10 Dec	TAP	direct
05 Dec - 12 Dec	TAP	direct
05 Dec - 10 Dec	TAP	direct
01 Dec - 15 Dec	TAP	direct
08 Dec - 15 Dec	TAP	direct
10 Dec - 17 Dec	TAP	direct
07 Dec - 15 Dec	TAP	direct
01 Dec - 08 Dec	Air Canada
04 Dec - 11 Dec	British Airways
27 Dec - 15 Jan	Air Canada	direct
15 Dec - 10 Jan	Air Transat	direct
29 Dec - 24 Jan	Air Canada
31 Dec - 07 Jan	TAP	direct
31 Dec - 11 Jan	TAP	direct
16 Dec - 10 Jan	Air Transat
25 Dec - 17 Jan	Air Canada	direct
30 Dec - 06 Jan	Air Transat
23 Dec - 13 Jan	Air Canada	direct
23 Dec - 12 Jan	Air Canada

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 322€

Return flights