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

Return flights

22 Oct - 29 Oct	Air Canada
23 Oct - 30 Oct	Air Canada
25 Oct - 30 Oct	Air Canada
22 Oct - 02 Nov	Air Canada
22 Oct - 05 Nov	Air Canada
22 Oct - 19 Nov	Air Canada
23 Oct - 05 Nov	Air Canada
20 Oct - 09 Nov	Air Canada	direct
23 Oct - 05 Nov	Lufthansa	direct
22 Oct - 09 Nov	Air Canada
23 Oct - 14 Nov	Air Canada
23 Oct - 14 Nov	Lufthansa	direct
24 Oct - 11 Nov	Air Canada
25 Oct - 29 Oct	Air Canada
26 Oct - 29 Oct	Virgin Atlantic
22 Oct - 31 Oct	Lufthansa
20 Oct - 25 Oct	Air Canada
27 Oct - 29 Oct	WestJet
22 Oct - 24 Oct	Air Canada
23 Oct - 25 Oct	Air Canada

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 536€

Return flights