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

Return flights

28 Aug - 10 Sep	TAP	direct
25 Aug - 30 Sep	Delta
22 Aug - 05 Sep	TAP	direct
24 Aug - 05 Sep	TAP	direct
21 Aug - 05 Sep	TAP	direct
20 Aug - 05 Sep	TAP	direct
25 Aug - 05 Sep	TAP	direct
25 Aug - 08 Sep	Delta
28 Aug - 04 Sep	TAP	direct
31 Aug - 08 Sep	Porter Airlines (Canada) Ltd
22 Aug - 25 Aug	TAP
21 Aug - 25 Aug	TAP
18 Aug - 25 Aug	TAP
21 Aug - 26 Aug	TAP
17 Aug - 26 Aug	Air Transat
19 Aug - 28 Aug	Air Transat
25 Aug - 31 Aug	WestJet
03 Aug - 12 Aug	Delta
06 Aug - 11 Aug	Delta
04 Aug - 11 Aug	Delta

Also check the deals for one-way flights from Toronto 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 Toronto to Lisbon in August from 464€

Return flights