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
18 Aug - 29 Aug	WestJet
24 Aug - 03 Sep	Air Transat
31 Aug - 09 Sep	WestJet
28 Aug - 07 Sep	WestJet
20 Aug - 31 Aug	Air Transat
01 Aug - 13 Aug	WestJet
01 Aug - 10 Aug	WestJet
05 Aug - 15 Aug	Air Transat

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 $706

Return flights