Cheapest return flights from Ontario to Lisbon in September from $518

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

Return flights

20 Sep - 01 Oct British Airways
27 Sep - 06 Oct British Airways
29 Sep - 13 Oct British Airways
22 Sep - 03 Oct British Airways
28 Sep - 12 Oct British Airways
15 Sep - 24 Sep British Airways
01 Sep - 08 Sep British Airways
01 Sep - 15 Sep British Airways
09 Sep - 16 Sep British Airways
18 Sep - 22 Sep British Airways
24 Sep - 13 Oct British Airways
18 Sep - 13 Oct British Airways
04 Sep - 18 Sep British Airways
11 Sep - 18 Sep British Airways
16 Sep - 24 Sep British Airways
04 Sep - 19 Sep British Airways
11 Sep - 26 Sep British Airways
26 Sep - 05 Oct British Airways

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

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