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

Return flights

01 Dec - 07 Dec	Air Canada
02 Dec - 06 Dec	Air Canada
02 Dec - 07 Dec	Air Canada
01 Dec - 06 Dec	Air Canada
03 Dec - 07 Dec	Air Canada
01 Dec - 05 Dec	Air Canada
04 Dec - 16 Dec	Air France
30 Dec - 20 Jan	Lufthansa
03 Dec - 27 Dec	Air Canada
04 Dec - 27 Dec	Air France
07 Dec - 27 Dec	Air France
31 Dec - 07 Jan	Air Canada
31 Dec - 10 Jan	Air Canada
09 Dec - 03 Jan	Air Canada
10 Dec - 03 Jan	Air Canada
08 Dec - 03 Jan	Air Canada
21 Dec - 07 Jan	Air Canada
23 Dec - 04 Jan	Air France
21 Dec - 03 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 $606

Return flights