AirHint found the following cheapest return flights from Lisbon (LIS) to Montreal (YUL) in September 2026 (see full year).
Return flights
| 04 Sep - 07 Sep | KLM | ||
| 15 Sep - 06 Oct | Air Canada | ||
| 04 Sep - 07 Sep | Air Canada | direct | |
| 01 Sep - 03 Sep | Air Transat | ||
| 01 Sep - 03 Sep | Air Canada | direct |
Also check the deals for one-way flights from Lisbon to Montreal in September.
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