Cheapest return flights from Ontario to Lisbon in May from $488

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

Return flights

05 May - 12 May British Airways
07 May - 21 May British Airways
17 May - 24 May British Airways
08 May - 24 May British Airways
09 May - 13 May British Airways
17 May - 01 Jun British Airways
16 May - 16 Jun British Airways
24 May - 05 Jun British Airways
29 May - 09 Jun British Airways
15 May - 15 Jun British Airways
23 May - 30 May British Airways
23 May - 05 Jun British Airways
26 May - 07 Jun British Airways
21 May - 01 Jun British Airways
21 May - 26 May British Airways
22 May - 03 Jun Iberia
20 May - 26 May Iberia

Also check the deals for one-way flights from Ontario to Lisbon in May.

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