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

Return flights

20 Aug - 03 Sep	TAP	direct
18 Aug - 04 Sep	TAP	direct
20 Aug - 08 Sep	Air Transat	direct
25 Aug - 08 Sep	Air Transat	direct
20 Aug - 16 Sep	Air Transat	direct
24 Aug - 03 Sep	TAP	direct
25 Aug - 03 Sep	TAP	direct
25 Aug - 04 Sep	TAP	direct
19 Aug - 04 Sep	Air Transat	direct
26 Aug - 04 Sep	Air Transat	direct
18 Aug - 26 Aug	Air Transat	direct
19 Aug - 26 Aug	Air Transat	direct
18 Aug - 29 Aug	Delta
17 Aug - 29 Aug	Delta
22 Aug - 29 Aug	Air France
15 Aug - 29 Aug	Delta
14 Aug - 28 Aug	Air France
15 Aug - 28 Aug	Air France
20 Aug - 28 Aug	Air France
01 Aug - 29 Aug	Delta

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

Return flights