AirHint found the following cheapest return flights from Ottawa (YOW) to Lisbon (LIS) in May 2026 (see full year).
Return flights
| 07 May - 10 May | Air France | ||
| 01 May - 08 May | Air France | ||
| 03 May - 09 May | Air France | ||
| 24 May - 04 Jun | Air Transat | ||
| 04 May - 08 Jun | Air Canada | ||
| 05 May - 23 May | Air France | ||
| 09 May - 18 May | Air Transat |
Also check the deals for one-way flights from Ottawa to Lisbon in May.
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