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

Return flights

12 May - 20 May	Air Transat
13 May - 20 May	Air Transat
22 May - 02 Jun	Air Transat
05 May - 10 May	Air Transat
24 May - 28 May	Air Transat
10 May - 21 May	Air Transat
12 May - 18 May	Air Transat
03 May - 17 May	Air Transat
08 May - 18 May	Air Transat
14 May - 24 May	Air Transat
12 May - 08 Jun	Air Transat
04 May - 18 May	Porter Airlines (Canada) Ltd
27 May - 02 Jun	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Toronto 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.

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Cheapest return flights from Toronto to Porto in May from $620

Return flights