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

Return flights

31 Dec - 14 Jan	KLM
09 Dec - 15 Dec	SWISS
05 Dec - 09 Dec	SWISS
03 Dec - 08 Dec	SWISS
02 Dec - 12 Dec	SWISS
05 Dec - 08 Dec	SWISS
08 Dec - 15 Dec	KLM
31 Dec - 08 Jan	SWISS
03 Dec - 11 Dec	KLM
29 Dec - 09 Jan	SWISS
10 Dec - 14 Dec	SWISS
10 Dec - 12 Dec	SWISS
03 Dec - 13 Dec	SWISS
29 Dec - 12 Jan	SWISS
30 Dec - 09 Jan	SWISS
31 Dec - 07 Jan	SWISS
26 Dec - 01 Jan	KLM
31 Dec - 11 Jan	SWISS
31 Dec - 01 Jan	SWISS
09 Dec - 09 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 $245

Return flights