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

Return flights

28 Aug - 08 Sep	WestJet
25 Aug - 08 Sep	WestJet
25 Aug - 09 Sep	WestJet
25 Aug - 11 Sep	WestJet
29 Aug - 09 Sep	WestJet
22 Aug - 05 Sep	WestJet
26 Aug - 05 Sep	WestJet
23 Aug - 31 Aug	WestJet
29 Aug - 29 Sep	WestJet
21 Aug - 28 Aug	WestJet
20 Aug - 07 Sep	WestJet
27 Aug - 03 Sep	WestJet
19 Aug - 31 Aug	WestJet
18 Aug - 31 Aug	WestJet
05 Aug - 10 Aug	WestJet
05 Aug - 09 Aug	WestJet

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

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 August from 1340€

Return flights