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

Return flights

17 Dec - 09 Jan	Etihad Airways
29 Dec - 05 Jan	Qatar Airways
18 Dec - 05 Jan	Qatar Airways
22 Dec - 17 Jan	Qatar Airways
01 Dec - 09 Dec	Air India
01 Dec - 10 Dec	Air India
25 Dec - 02 Jan	Air India
24 Dec - 03 Jan	Air India
20 Dec - 31 Dec	Air India
10 Dec - 18 Dec	Air India
10 Dec - 16 Dec	Air India
16 Dec - 23 Dec	Etihad Airways
06 Dec - 19 Dec	Air India

Also check the deals for one-way flights from Kolkata 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 Kolkata to London in December from $658

Return flights