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
$ 518
27 Sep
- 06 Oct
British Airways
$ 518
29 Sep
- 13 Oct
British Airways
$ 518
22 Sep
- 03 Oct
British Airways
$ 578
28 Sep
- 12 Oct
British Airways
$ 599
15 Sep
- 24 Sep
British Airways
$ 628
01 Sep
- 08 Sep
British Airways
$ 628
01 Sep
- 15 Sep
British Airways
$ 628
09 Sep
- 16 Sep
British Airways
$ 632
18 Sep
- 22 Sep
British Airways
$ 653
24 Sep
- 13 Oct
British Airways
$ 653
18 Sep
- 13 Oct
British Airways
$ 658
04 Sep
- 18 Sep
British Airways
$ 698
11 Sep
- 18 Sep
British Airways
$ 698
16 Sep
- 24 Sep
British Airways
$ 752
04 Sep
- 19 Sep
British Airways
$ 758
11 Sep
- 26 Sep
British Airways
$ 758
26 Sep
- 05 Oct
British Airways
$ 1895
Also check the deals for one-way flights from Ontario to Lisbon in September .
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