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

Return flights

03 Dec - 07 Dec	Lufthansa	direct
05 Dec - 10 Dec	Lufthansa	direct
03 Dec - 10 Dec	Lufthansa	direct
02 Dec - 07 Dec	Air Canada
01 Dec - 08 Dec	Air Canada
03 Dec - 08 Dec	Air Canada
07 Dec - 15 Dec	Air Canada
31 Dec - 24 Jan	Aer Lingus
07 Dec - 18 Dec	Air Canada
09 Dec - 15 Jan	Air Canada
29 Dec - 24 Jan	Air Canada
04 Dec - 27 Dec	Air France
07 Dec - 27 Dec	Air France
28 Dec - 17 Jan	Air Canada
26 Dec - 17 Jan	Air Canada
07 Dec - 07 Jan	Air Canada
14 Dec - 09 Jan	Lufthansa
31 Dec - 08 Jan	Air Canada
30 Dec - 10 Jan	Air Canada
31 Dec - 11 Jan	Air Canada

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 $658

Return flights