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

Return flights

15 Dec - 10 Jan	Porter Airlines (Canada) Ltd
16 Dec - 10 Jan	Porter Airlines (Canada) Ltd
22 Dec - 17 Jan	Air Transat
17 Dec - 10 Jan	Porter Airlines (Canada) Ltd
21 Dec - 10 Jan	Porter Airlines (Canada) Ltd
20 Dec - 10 Jan	Air Canada
18 Dec - 10 Jan	Porter Airlines (Canada) Ltd
19 Dec - 10 Jan	Air Canada
10 Dec - 03 Jan	Porter Airlines (Canada) Ltd
11 Dec - 03 Jan	Porter Airlines (Canada) Ltd
22 Dec - 31 Dec	Air Transat
20 Dec - 28 Dec	Air Transat

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

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 December from $761

Return flights