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

Return flights

22 Oct - 15 Nov	WestJet
25 Oct - 15 Nov	WestJet
15 Oct - 22 Oct	Air Canada
01 Oct - 07 Oct	Air Canada
15 Oct - 22 Oct	Lufthansa	direct
08 Oct - 15 Oct	Air Canada
01 Oct - 08 Oct	Air Canada
23 Oct - 15 Nov	WestJet
16 Oct - 22 Oct	Air Canada
13 Oct - 08 Nov	Air Canada
15 Oct - 08 Nov	Air Canada
20 Oct - 15 Nov	Air Canada
22 Oct - 31 Oct	Air Canada
21 Oct - 15 Nov	Air Canada
07 Oct - 01 Nov	Air Canada
08 Oct - 01 Nov	Air Canada
06 Oct - 01 Nov	Air Canada
11 Oct - 15 Oct	Air Canada
15 Oct - 23 Oct	Air Canada	direct
18 Oct - 22 Oct	Air Canada	direct

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

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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Cheapest return flights from Ottawa to London in October from $599

Return flights