AirHint found the following cheapest return flights from Montreal (YUL) to Lisbon (LIS) in May 2026 (see full year).

Return flights

03 May - 23 May	Finnair
01 May - 23 May	Finnair
02 May - 23 May	Finnair
03 May - 10 May	Finnair
03 May - 13 May	Finnair
03 May - 14 May	Finnair
03 May - 16 May	Finnair
01 May - 08 May	Finnair
02 May - 13 May	Finnair
01 May - 15 May	Finnair
11 May - 06 Jun	Azores Airlines
27 May - 03 Jun	Finnair
26 May - 02 Jun	Finnair
25 May - 05 Jun	TAP	direct
24 May - 05 Jun	TAP	direct
25 May - 11 Jun	Air Transat	direct
25 May - 01 Jun	Air Transat	direct
27 May - 03 Jun	TAP	direct
31 May - 07 Jun	TAP	direct
25 May - 07 Jun	TAP	direct

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

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 May from $382

Return flights