Cheapest one-way flights from Ottawa to London in September from $331

AirHint found the following cheapest one-way flights from Ottawa (YOW) to London (LHR) in September 2025 (see full year).

One-Way flights

21 Sep Porter Airlines (Canada) Ltd
01 Sep WestJet
22 Sep Porter Airlines (Canada) Ltd
17 Sep Porter Airlines (Canada) Ltd
02 Sep Porter Airlines (Canada) Ltd
16 Sep Porter Airlines (Canada) Ltd
03 Sep Porter Airlines (Canada) Ltd
18 Sep Porter Airlines (Canada) Ltd
04 Sep Porter Airlines (Canada) Ltd
05 Sep Air Transat

Also check the deals for return flights from Ottawa to London in September.

Skyscanner

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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