AirHint found the following cheapest return flights from Ottawa (YOW) to London (LHR) in May 2026 (see full year).
Return flights
| 13 May - 23 May | Air Canada | ||
| 07 May - 14 May | Lufthansa | direct | |
| 01 May - 23 May | Air Canada | ||
| 22 May - 13 Jun | Air Canada | ||
| 06 May - 23 May | Delta |
Also check the deals for one-way flights from Ottawa to London in May.
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