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

Return flights

01 Dec - 10 Dec	WestJet
01 Dec - 08 Dec	WestJet	direct
01 Dec - 10 Dec	WestJet	direct
11 Dec - 21 Dec	WestJet	direct
07 Dec - 14 Dec	WestJet
06 Dec - 12 Dec	WestJet
05 Dec - 14 Dec	WestJet
01 Dec - 11 Dec	WestJet
02 Dec - 16 Dec	WestJet	direct
07 Dec - 14 Dec	WestJet	direct
25 Dec - 15 Jan	WestJet	direct
25 Dec - 11 Jan	WestJet	direct
25 Dec - 14 Jan	WestJet	direct
25 Dec - 13 Jan	WestJet	direct
16 Dec - 09 Jan	WestJet	direct
25 Dec - 12 Jan	WestJet	direct
11 Dec - 06 Jan	WestJet	direct
26 Dec - 09 Jan	WestJet	direct
24 Dec - 06 Jan	WestJet	direct
31 Dec - 07 Jan	Air Canada

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 340€

Return flights