AirHint found the following cheapest return flights from Hamilton (YHM) to Lisbon (LIS) in September 2025 (see full year).

Return flights

20 Sep - 11 Oct	Porter Airlines (Canada) Ltd
29 Sep - 16 Oct	WestJet
27 Sep - 18 Oct	WestJet
29 Sep - 06 Oct	WestJet
24 Sep - 18 Oct	WestJet
23 Sep - 18 Oct	WestJet
25 Sep - 18 Oct	WestJet
26 Sep - 18 Oct	WestJet
22 Sep - 13 Oct	WestJet
25 Sep - 16 Oct	WestJet
22 Sep - 27 Sep	WestJet
22 Sep - 29 Sep	WestJet

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

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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Cheapest return flights from Hamilton to Lisbon in September from $1116

Return flights