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

Return flights

17 May - 24 May	TAP
10 May - 17 May	TAP
25 May - 01 Jun	TAP
11 May - 18 May	Azores Airlines
21 May - 28 May	Azores Airlines
14 May - 21 May	Azores Airlines
16 May - 23 May	Azores Airlines
18 May - 25 May	Azores Airlines
04 May - 11 May	Azores Airlines
01 May - 08 May	TAP
03 May - 10 May	TAP
27 May - 03 Jun	TAP
31 May - 07 Jun	TAP
28 May - 04 Jun	Air France
29 May - 05 Jun	FrenchBee
30 May - 12 Jun	SWISS
26 May - 02 Jun	Air Canada
30 May - 06 Jun	TAP

Also check the deals for one-way flights from Montreal to Porto 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.

Book a cheap hotel in Porto

Cheap car rent in Porto

Cheapest return flights from Montreal to Porto in May from $540

Return flights