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

Return flights

16 Dec - 20 Jan	Air India
15 Dec - 15 Jan	Air India
22 Dec - 01 Jan	Air India
04 Dec - 08 Jan	Air India
24 Dec - 11 Jan	Air India
17 Dec - 03 Jan	Air India
16 Dec - 31 Dec	Air India
07 Dec - 03 Jan	Air India
12 Dec - 12 Jan	Air India
22 Dec - 02 Jan	Air India
04 Dec - 04 Jan	Air India
22 Dec - 29 Dec	Air India
25 Dec - 29 Dec	Air India
18 Dec - 29 Dec	Air India
13 Dec - 30 Dec	Air India
13 Dec - 31 Dec	Air India
22 Dec - 28 Dec	Air India
15 Dec - 27 Dec	Air India
18 Dec - 28 Dec	Air India
20 Dec - 27 Dec	Air India

Also check the deals for one-way flights from Colombo 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 Colombo to London in December from 590€

Return flights