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

Return flights

22 Dec - 20 Jan	Air India
24 Dec - 20 Jan	Air India
13 Dec - 13 Jan	Air India
20 Dec - 20 Jan	Air India
23 Dec - 07 Jan	IndiGo
22 Dec - 18 Jan	Etihad Airways
15 Dec - 15 Jan	Air India
16 Dec - 06 Jan	Air India
11 Dec - 08 Jan	Air India
23 Dec - 13 Jan	Air India
23 Dec - 31 Dec	Air India
23 Dec - 30 Dec	Air India
24 Dec - 31 Dec	Air India
18 Dec - 31 Dec	IndiGo
10 Dec - 30 Dec	Air India
18 Dec - 28 Dec	Etihad Airways
22 Dec - 31 Dec	Air India
22 Dec - 29 Dec	Air India
11 Dec - 14 Dec	SriLankan Airlines
13 Dec - 31 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 $694

Return flights