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

Return flights

03 Dec - 07 Dec	SWISS
04 Dec - 07 Dec	SWISS
09 Dec - 30 Dec	WestJet	direct
01 Dec - 11 Dec	SWISS
01 Dec - 07 Dec	SWISS
05 Dec - 09 Dec	SWISS
08 Dec - 30 Dec	WestJet	direct
03 Dec - 07 Dec	WestJet	direct
04 Dec - 07 Dec	WestJet	direct
05 Dec - 07 Dec	Lufthansa
25 Dec - 09 Jan	WestJet	direct
13 Dec - 11 Jan	SWISS
17 Dec - 16 Jan	WestJet	direct
13 Dec - 11 Jan	WestJet	direct
03 Dec - 08 Jan	WestJet	direct
25 Dec - 07 Jan	WestJet	direct
28 Dec - 05 Jan	British Airways
16 Dec - 05 Jan	British Airways
25 Dec - 15 Jan	Air France
16 Dec - 07 Jan	British Airways

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.

Book a cheap hotel in Calgary

Cheap car rent in Calgary

Cheapest return flights from London to Calgary in December from 364€

Return flights