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

Return flights

03 Dec - 28 Jan	WestJet	direct
01 Dec - 08 Dec	WestJet	direct
29 Dec - 24 Jan	WestJet	direct
01 Dec - 06 Dec	WestJet	direct
04 Dec - 09 Dec	WestJet	direct
03 Dec - 09 Dec	WestJet	direct
01 Dec - 05 Dec	WestJet	direct
29 Dec - 14 Jan	WestJet	direct
01 Dec - 11 Dec	WestJet
25 Dec - 17 Jan	WestJet	direct
08 Dec - 12 Jan	WestJet
07 Dec - 14 Jan	WestJet	direct
03 Dec - 17 Dec	WestJet	direct
02 Dec - 27 Dec	WestJet
05 Dec - 15 Dec	WestJet	direct
07 Dec - 12 Jan	WestJet
03 Dec - 07 Jan	Lufthansa
08 Dec - 15 Dec	WestJet	direct
09 Dec - 06 Jan	WestJet	direct
03 Dec - 07 Jan	WestJet	direct

Also check the deals for one-way flights from Calgary 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 Calgary to London in December from 367€

Return flights