Cheapest return flights from Ontario to Porto in September from 840€

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

Return flights

01 Sep - 08 Sep KLM
15 Sep - 22 Sep Turkish Airlines
20 Sep - 04 Oct Turkish Airlines
11 Sep - 28 Sep Turkish Airlines
02 Sep - 09 Sep British Airways
23 Sep - 30 Sep Turkish Airlines
08 Sep - 15 Sep British Airways
20 Sep - 20 Oct British Airways
25 Sep - 27 Sep British Airways

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

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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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