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

Return flights

01 Dec - 11 Dec	Air Canada
13 Dec - 18 Jan	Air Canada
12 Dec - 27 Dec	Air France
02 Dec - 27 Dec	Air France
04 Dec - 27 Dec	Air France
05 Dec - 27 Dec	Air France
24 Dec - 17 Jan	Air Canada
01 Dec - 27 Dec	Air Canada
03 Dec - 27 Dec	Air Canada
10 Dec - 06 Jan	Aer Lingus
23 Dec - 17 Jan	Air Canada
22 Dec - 17 Jan	Air Canada
28 Dec - 06 Jan	Virgin Atlantic
29 Dec - 05 Jan	Virgin Atlantic
21 Dec - 24 Dec	Porter Airlines (Canada) Ltd
22 Dec - 30 Dec	Air Canada
21 Dec - 30 Dec	Air Canada
24 Dec - 01 Jan	Air France
08 Dec - 03 Jan	Air Canada
23 Dec - 05 Jan	Air France

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 591€

Return flights