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

Return flights

22 Dec - 05 Jan	Air India
14 Dec - 07 Jan	Air India
22 Dec - 31 Dec	Air India
23 Dec - 30 Dec	Air India
24 Dec - 02 Jan	Air India
20 Dec - 05 Jan	Air India
20 Dec - 31 Dec	Air India
20 Dec - 02 Jan	Air India
21 Dec - 30 Dec	Air India
21 Dec - 01 Jan	Air India
23 Dec - 04 Jan	Air India
19 Dec - 07 Jan	Air India
23 Dec - 16 Jan	Air India
25 Dec - 03 Jan	Air India
13 Dec - 29 Dec	Air India
02 Dec - 09 Dec	IndiGo
01 Dec - 09 Dec	Air India
01 Dec - 08 Dec	Air India
03 Dec - 07 Dec	Air India
14 Dec - 28 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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Kolkata to London in December from 445€

Return flights