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

Return flights

13 Dec - 03 Jan	IndiGo
12 Dec - 12 Jan	AirAsia
09 Dec - 05 Jan	Air India
15 Dec - 15 Jan	Air India
01 Dec - 05 Jan	Air India
01 Dec - 06 Jan	Air India
01 Dec - 07 Jan	Air India
10 Dec - 01 Jan	Air India
25 Dec - 08 Jan	Air India
12 Dec - 22 Dec	AirAsia
02 Dec - 04 Jan	Air India
22 Dec - 31 Dec	Air India
16 Dec - 31 Dec	Air India
09 Dec - 31 Dec	Air India
24 Dec - 30 Dec	Air India
07 Dec - 29 Dec	Air India
01 Dec - 08 Dec	Air India
15 Dec - 31 Dec	Air India
21 Dec - 30 Dec	Air India
22 Dec - 29 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 548€

Return flights