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

Return flights

05 Dec - 28 Jan	IndiGo
10 Dec - 16 Jan	IndiGo
23 Dec - 26 Jan	IndiGo
25 Dec - 28 Jan	Etihad Airways
13 Dec - 24 Jan	IndiGo
11 Dec - 04 Jan	IndiGo
25 Dec - 08 Jan	Etihad Airways
28 Dec - 28 Jan	IndiGo
26 Dec - 11 Jan	Air Arabia
06 Dec - 10 Jan	Etihad Airways
01 Dec - 08 Dec	IndiGo
22 Dec - 31 Dec	IndiGo
03 Dec - 10 Dec	IndiGo
04 Dec - 11 Dec	IndiGo
09 Dec - 13 Dec	Air Arabia
19 Dec - 31 Dec	China Eastern
20 Dec - 31 Dec	China Eastern
16 Dec - 31 Dec	China Eastern
13 Dec - 31 Dec	China Eastern
13 Dec - 29 Dec	Gulf Air

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 449€

Return flights