AirHint found the following cheapest return flights from Ottawa (YOW) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 07 Dec - 12 Dec | Air Canada | ||
| 22 Dec - 31 Dec | Air Transat | ||
| 29 Dec - 02 Jan | Air Transat | ||
| 21 Dec - 31 Dec | Air France |
Also check the deals for one-way flights from Ottawa to Lisbon in December.
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