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

One-Way flights

05 Dec	Brussels Airlines
01 Dec	Scandinavian Airlines
08 Dec	Scandinavian Airlines
02 Dec	Scandinavian Airlines
04 Dec	Scandinavian Airlines
06 Dec	Brussels Airlines
09 Dec	SWISS
10 Dec	Vueling Airlines
07 Dec	Vueling Airlines
31 Dec	Eurowings

Also check the deals for return 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 one-way flights from London to Colombo in December from 289€

One-Way flights