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

Return flights

02 Dec - 11 Dec	SWISS
09 Dec - 18 Jan	SWISS
01 Dec - 31 Jan	SWISS
01 Dec - 11 Dec	SWISS
02 Dec - 09 Dec	Air Transat
04 Dec - 09 Dec	Air Transat
02 Dec - 06 Dec	Air Transat
02 Dec - 08 Dec	Air Transat
04 Dec - 06 Dec	Air Transat
06 Dec - 20 Jan	Air Transat
05 Dec - 08 Dec	Air Transat
05 Dec - 09 Dec	Air Transat
04 Dec - 15 Dec	Air Transat
05 Dec - 12 Jan	Norse Atlantic Airways (UK)
06 Dec - 13 Jan	Air Transat
06 Dec - 11 Jan	Norse Atlantic Airways (UK)
14 Dec - 24 Jan	Air Transat
07 Dec - 21 Jan	Air Transat
08 Dec - 20 Jan	Air Transat
15 Dec - 10 Jan	easyJet

Also check the deals for one-way flights from London to Calgary 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 London to Calgary in December from 383€

Return flights