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

Return flights

01 Sep - 03 Sep	Lufthansa	direct
10 Sep - 16 Sep	Lufthansa	direct
02 Sep - 10 Sep	Lufthansa	direct
01 Sep - 10 Sep	Lufthansa	direct
11 Sep - 16 Sep	Lufthansa	direct
11 Sep - 17 Sep	Lufthansa	direct
15 Sep - 22 Sep	Lufthansa	direct
08 Sep - 10 Sep	Lufthansa	direct
02 Sep - 09 Sep	Lufthansa	direct
11 Sep - 18 Sep	Lufthansa	direct
26 Sep - 01 Oct	Lufthansa	direct
29 Sep - 05 Oct	Lufthansa	direct
26 Sep - 03 Oct	Lufthansa	direct
24 Sep - 02 Oct	Lufthansa	direct
24 Sep - 04 Oct	KLM
20 Sep - 05 Oct	SWISS

Also check the deals for one-way flights from London to Frankfurt 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 Frankfurt in September from $193

Return flights