Cheapest return flights from Ottawa to London in September from $637

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

Return flights

30 Sep - 25 Oct Lufthansa
11 Sep - 04 Oct Air Canada
10 Sep - 02 Oct Air Canada
24 Sep - 08 Oct Air Canada
08 Sep - 04 Oct Air Canada
17 Sep - 04 Oct Lufthansa
27 Sep - 04 Oct WestJet
10 Sep - 02 Oct Lufthansa direct
18 Sep - 05 Oct Lufthansa
22 Sep - 18 Oct Air Canada
10 Sep - 17 Sep WestJet
18 Sep - 22 Sep Air Canada
11 Sep - 15 Sep Air Canada
15 Sep - 29 Sep Lufthansa
08 Sep - 22 Sep Air Canada
10 Sep - 17 Sep Lufthansa direct
15 Sep - 28 Sep Lufthansa
07 Sep - 27 Sep Air Canada
04 Sep - 27 Sep Air Canada
05 Sep - 27 Sep Air Canada

Also check the deals for one-way 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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