Cheapest return flights from Ottawa to London in September from $718

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

Return flights

07 Sep - 30 Sep Porter Airlines (Canada) Ltd
09 Sep - 25 Sep Air Canada
20 Sep - 01 Oct Air Canada
20 Sep - 01 Oct Lufthansa direct
05 Sep - 15 Sep Porter Airlines (Canada) Ltd
04 Sep - 24 Sep Porter Airlines (Canada) Ltd
25 Sep - 28 Sep Air France
11 Sep - 13 Sep Virgin Atlantic
01 Sep - 13 Oct Air Canada
01 Sep - 13 Oct Lufthansa direct
24 Sep - 27 Sep Condor
11 Sep - 13 Sep Air Canada direct
24 Sep - 27 Sep Lufthansa direct

Also check the deals for one-way flights from Ottawa to London in September.

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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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