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

Return flights

01 Dec - 14 Dec	TAP	direct
14 Dec - 14 Jan	TAP	direct
03 Dec - 10 Dec	TAP	direct
07 Dec - 14 Dec	TAP	direct
01 Dec - 10 Dec	TAP	direct
12 Dec - 28 Dec	TAP	direct
08 Dec - 15 Dec	TAP	direct
10 Dec - 17 Dec	TAP	direct
01 Dec - 08 Dec	Air Canada
05 Dec - 12 Dec	TAP	direct
02 Dec - 09 Dec	Lufthansa	direct
30 Dec - 07 Jan	Air Transat
25 Dec - 12 Jan	Air Transat
31 Dec - 07 Jan	TAP	direct
24 Dec - 07 Jan	Air Transat
30 Dec - 08 Jan	Air Canada
30 Dec - 06 Jan	Air Transat
29 Dec - 08 Jan	Air Canada
31 Dec - 08 Jan	Air Canada
24 Dec - 10 Jan	Air Transat

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 411€

Return flights