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

Return flights

08 Oct - 16 Oct	Air Canada
14 Oct - 21 Oct	Air Canada
10 Oct - 19 Oct	Air Canada
24 Oct - 01 Nov	Air Canada
02 Oct - 15 Oct	Air Canada
29 Oct - 22 Nov	Air Canada
06 Oct - 01 Nov	Air Canada
19 Oct - 08 Nov	Air Canada
27 Oct - 22 Nov	Air Canada
15 Oct - 08 Nov	Air Canada
07 Oct - 01 Nov	Air Canada
08 Oct - 01 Nov	Air Canada
03 Oct - 09 Oct	Air Canada
11 Oct - 15 Oct	Air Canada
15 Oct - 22 Oct	Air Canada
02 Oct - 08 Oct	Air Canada
09 Oct - 16 Oct	Lufthansa	direct
08 Oct - 16 Oct	Lufthansa	direct
30 Oct - 22 Nov	Porter Airlines (Canada) Ltd
30 Oct - 11 Nov	Virgin Atlantic

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 499€

Return flights