Cheapest return flights from Ontario to Porto in May from 977€

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

Return flights

26 May - 02 Jun KLM
27 May - 03 Jun KLM
15 May - 22 May KLM
28 May - 04 Jun KLM
18 May - 25 May Turkish Airlines
23 May - 30 May KLM
24 May - 31 May Volaris
17 May - 24 May Turkish Airlines
19 May - 26 May Turkish Airlines
22 May - 29 May Turkish Airlines
29 May - 05 Jun Turkish Airlines
16 May - 23 May British Airways
25 May - 01 Jun Iberia

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

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