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

Return flights

30 Sep - 10 Oct	Lufthansa
30 Sep - 01 Oct	Lufthansa
30 Sep - 06 Oct	Lufthansa
23 Sep - 25 Sep	Lufthansa
23 Sep - 26 Sep	ITA Airways
24 Sep - 01 Oct	Lufthansa
30 Sep - 30 Sep	Lufthansa
24 Sep - 30 Sep	Lufthansa
19 Sep - 22 Sep	SWISS
25 Sep - 01 Oct	Lufthansa
23 Sep - 24 Sep	Lufthansa
18 Sep - 23 Sep	Lufthansa
24 Sep - 25 Sep	Lufthansa
25 Sep - 30 Sep	Lufthansa
29 Sep - 08 Oct	ITA Airways
30 Sep - 03 Oct	Lufthansa
29 Sep - 10 Oct	Lufthansa
29 Sep - 06 Oct	Lufthansa
30 Sep - 02 Oct	ITA Airways
18 Sep - 22 Sep	Lufthansa

Also check the deals for one-way flights from London to Sofia 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 Sofia in September from $277

Return flights