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

Return flights

03 May - 13 May	Air Canada
04 May - 18 May	Air Canada
12 May - 19 May	Air Canada
03 May - 20 May	SWISS
18 May - 27 May	Air Canada
04 May - 30 May	Air Canada
03 May - 23 May	Air Canada
04 May - 17 May	Air Canada
29 May - 08 Jun	Air Canada
26 May - 31 May	Air Canada
02 May - 23 May	Air Canada
19 May - 13 Jun	Air Canada
25 May - 20 Jun	Air Canada
23 May - 13 Jun	Air Canada
30 May - 28 Jun	SWISS
24 May - 03 Jun	SWISS

Also check the deals for one-way flights from Toronto 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 Toronto to Lisbon in May from 694€

Return flights