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

Return flights

12 Dec - 15 Dec	Luxair
05 Dec - 08 Dec	Luxair
03 Dec - 08 Dec	KLM
09 Dec - 11 Dec	SWISS
31 Dec - 07 Jan	SWISS
01 Dec - 08 Dec	KLM
04 Dec - 11 Dec	Lufthansa
04 Dec - 08 Dec	KLM
04 Dec - 06 Dec	KLM
02 Dec - 08 Dec	Lufthansa
04 Dec - 07 Dec	Lufthansa
29 Dec - 15 Jan	SWISS
26 Dec - 05 Jan	KLM
26 Dec - 02 Jan	KLM
28 Dec - 01 Jan	KLM
24 Dec - 06 Jan	SWISS
30 Dec - 01 Jan	KLM
31 Dec - 04 Jan	KLM
27 Dec - 01 Jan	SWISS
28 Dec - 04 Jan	KLM

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 232€

Return flights