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

Return flights

01 May - 14 May	Air Transat
10 May - 20 May	Air Transat
08 May - 14 May	Air Transat
11 May - 20 May	Air Transat
08 May - 16 May	Air Transat
02 May - 09 May	Air Transat
06 May - 13 May	Air Transat
13 May - 20 May	Air Transat
05 May - 12 May	Air Transat
06 May - 20 May	Air Transat
15 May - 01 Jun	Air Transat
02 May - 02 Jun	Air Transat
15 May - 06 Jun	Air Transat
13 May - 01 Jun	Air Transat
09 May - 01 Jun	Air Transat
11 May - 01 Jun	Air Transat
11 May - 06 Jun	Air Transat
13 May - 06 Jun	Air Transat
16 May - 09 Jun	Air Transat
06 May - 11 Jun	Air Transat

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 336€

Return flights