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

Return flights

01 Dec - 22 Dec	Gulf Air
01 Dec - 23 Dec	Air India
04 Dec - 15 Dec	Air India
02 Dec - 09 Dec	Air India
04 Dec - 11 Dec	Air India
01 Dec - 09 Dec	Air India
04 Dec - 21 Dec	Air India
01 Dec - 18 Dec	Air India
04 Dec - 22 Dec	Air India
04 Dec - 23 Dec	Air India
02 Dec - 29 Jan	Gulf Air
04 Dec - 23 Jan	Etihad Airways
02 Dec - 19 Jan	Gulf Air
04 Dec - 22 Jan	Gulf Air
04 Dec - 24 Jan	Etihad Airways
04 Dec - 20 Jan	Etihad Airways
02 Dec - 16 Jan	Etihad Airways
04 Dec - 15 Jan	Etihad Airways
02 Dec - 15 Jan	Gulf Air
02 Dec - 21 Jan	Gulf Air

Also check the deals for one-way flights from London to Colombo 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 London to Colombo in December from 549€

Return flights