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

Return flights

03 Dec - 06 Dec	WestJet
08 Dec - 14 Dec	WestJet
03 Dec - 10 Dec	Air Transat
01 Dec - 12 Dec	WestJet
05 Dec - 09 Jan	Air Transat
01 Dec - 06 Dec	Air Transat
26 Dec - 16 Jan	Air Transat
11 Dec - 11 Jan	Air Transat
02 Dec - 16 Dec	Air Transat
22 Dec - 07 Jan	WestJet
23 Dec - 07 Jan	WestJet
11 Dec - 25 Dec	Porter Airlines (Canada) Ltd
12 Dec - 19 Dec	WestJet
22 Dec - 06 Jan	WestJet
10 Dec - 24 Dec	Air Transat
13 Dec - 27 Dec	WestJet
16 Dec - 06 Jan	Air Transat
17 Dec - 07 Jan	Air Transat
28 Dec - 05 Jan	WestJet
24 Dec - 06 Jan	Air Transat

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 $534

Return flights