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

One-Way flights

24 Aug	Air Transat	direct
25 Aug	Air Transat	direct
11 Aug	Air Transat	direct
13 Aug	Air Transat	direct
06 Aug	Air Transat	direct
12 Aug	Air Transat	direct
23 Aug	Air Transat
04 Aug	Air Canada	direct
03 Aug	Air Canada	direct
05 Aug	Air Canada	direct

Also check the deals for return 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 one-way flights from Montreal to Lisbon in August from 245€

One-Way flights