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

Return flights

04 May - 12 May	Finnair
12 May - 27 May	Finnair
04 May - 25 May	Finnair
11 May - 25 May	Finnair
11 May - 27 May	Finnair
05 May - 14 May	Finnair
03 May - 14 May	Finnair
04 May - 14 May	Finnair
03 May - 11 May	Finnair
05 May - 12 May	Finnair
26 May - 09 Jun	Finnair
27 May - 03 Jun	Finnair
26 May - 02 Jun	Finnair
30 May - 06 Jun	Finnair
25 May - 08 Jun	Air Transat	direct
27 May - 03 Jun	TAP	direct
31 May - 07 Jun	TAP	direct
25 May - 07 Jun	TAP	direct
26 May - 09 Jun	Air Transat	direct
26 May - 02 Jun	Air Transat	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 286€

Return flights