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

Return flights

22 Sep - 08 Oct	KLM
29 Sep - 06 Oct	KLM
15 Sep - 25 Sep	KLM
15 Sep - 06 Oct	KLM
16 Sep - 26 Sep	ITA Airways
15 Sep - 30 Sep	KLM
26 Sep - 29 Sep	KLM
22 Sep - 29 Sep	KLM
08 Sep - 23 Sep	KLM
22 Sep - 07 Oct	KLM
23 Sep - 09 Oct	KLM
21 Sep - 08 Oct	KLM
03 Sep - 17 Sep	Lufthansa
04 Sep - 18 Sep	Lufthansa
11 Sep - 23 Sep	Lufthansa
16 Sep - 29 Sep	Lufthansa
30 Sep - 07 Oct	Lufthansa
29 Sep - 02 Oct	KLM
17 Sep - 16 Oct	Lufthansa
21 Sep - 07 Oct	KLM

Also check the deals for one-way flights from London to Bucharest in September.

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 September from 207€

Return flights