AirHint found the following cheapest return flights from London (LCY) to Bucharest (OTP) in December 2025 (see full year).

Return flights

04 Dec - 06 Dec	KLM
04 Dec - 07 Dec	KLM
04 Dec - 11 Dec	KLM
06 Dec - 08 Dec	KLM
06 Dec - 09 Dec	KLM
30 Dec - 02 Jan	KLM
06 Dec - 07 Dec	KLM
16 Dec - 22 Dec	KLM
03 Dec - 05 Dec	Lufthansa
10 Dec - 12 Dec	Lufthansa
05 Dec - 07 Dec	SWISS
15 Dec - 09 Jan	Lufthansa
30 Dec - 10 Jan	SWISS
12 Dec - 09 Jan	Lufthansa
16 Dec - 09 Jan	SWISS
24 Dec - 09 Jan	SWISS
31 Dec - 02 Jan	KLM
12 Dec - 13 Jan	Lufthansa
31 Dec - 01 Jan	KLM
16 Dec - 10 Jan	SWISS

Also check the deals for one-way flights from London to Bucharest 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 Bucharest in December from $256

Return flights