AirHint found the following cheapest one-way flights from London (LHR) to Bucharest (OTP) in September 2025 (see full year).

One-Way flights

29 Sep	British Airways	direct
12 Sep	British Airways	direct
27 Sep	British Airways	direct
21 Sep	British Airways	direct
20 Sep	British Airways	direct
19 Sep	British Airways	direct
24 Sep	Vueling Airlines
18 Sep	British Airways	direct
08 Sep	Vueling Airlines
28 Sep	British Airways	direct

Also check the deals for return 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 one-way flights from London to Bucharest in September from 72€

One-Way flights