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

Return flights

26 Aug - 11 Sep	Air Transat
20 Aug - 26 Aug	WestJet
18 Aug - 01 Sep	Porter Airlines (Canada) Ltd
29 Aug - 07 Sep	WestJet
30 Aug - 09 Sep	WestJet
13 Aug - 31 Aug	Air Transat
17 Aug - 24 Aug	WestJet
15 Aug - 30 Aug	Air Transat
03 Aug - 09 Aug	Porter Airlines (Canada) Ltd
05 Aug - 15 Aug	Air Transat
01 Aug - 11 Aug	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Calgary 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 Calgary to Lisbon in August from 632€

Return flights