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

Return flights

20 May - 31 May	TAP	direct
15 May - 31 May	TAP	direct
11 May - 20 May	TAP	direct
03 May - 17 May	TAP	direct
22 May - 08 Jun	TAP	direct
25 May - 08 Jun	TAP	direct
22 May - 18 Jun	TAP	direct
04 May - 11 May	TAP	direct
06 May - 13 May	TAP	direct
08 May - 15 May	TAP	direct
10 May - 17 May	TAP	direct
20 May - 27 May	TAP	direct
24 May - 31 May	TAP	direct
27 May - 03 Jun	TAP	direct
31 May - 07 Jun	TAP	direct
25 May - 01 Jun	TAP	direct
28 May - 24 Jun	Air France
28 May - 04 Jun	Air Canada	direct
26 May - 02 Jun	Air Canada
28 May - 24 Jun	Lufthansa	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 483€

Return flights