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

Return flights

12 May - 26 May	Finnair
03 May - 13 May	Finnair
08 May - 16 May	Finnair
05 May - 12 May	Finnair
08 May - 15 May	Finnair
09 May - 16 May	Finnair
04 May - 11 May	Finnair
03 May - 10 May	Finnair
05 May - 26 May	Finnair
27 May - 03 Jun	SWISS
01 May - 12 May	Delta
27 May - 17 Jun	TAP	direct
31 May - 12 Jun	TAP	direct
27 May - 03 Jun	TAP	direct
31 May - 07 Jun	TAP	direct
25 May - 01 Jun	TAP	direct
28 May - 04 Jun	Air France
26 May - 02 Jun	Air Transat	direct
23 May - 01 Jun	Air Transat	direct
28 May - 04 Jun	Air Canada	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 278€

Return flights