AirHint found the following cheapest return flights from London (LHR) to Florence (FLR) in September 2025 (see full year).

Return flights

24 Sep - 27 Sep	Austrian Airlines
27 Sep - 07 Oct	SWISS
27 Sep - 01 Oct	SWISS
29 Sep - 06 Oct	Austrian Airlines
29 Sep - 07 Oct	SWISS
28 Sep - 07 Oct	British Airways	direct
29 Sep - 07 Oct	British Airways	direct
30 Sep - 07 Oct	British Airways	direct
28 Sep - 01 Oct	KLM
26 Sep - 07 Oct	Austrian Airlines
25 Sep - 01 Oct	Austrian Airlines
23 Sep - 30 Sep	Air France
22 Sep - 25 Sep	KLM
16 Sep - 23 Sep	British Airways	direct
15 Sep - 17 Sep	British Airways	direct
17 Sep - 18 Sep	Vueling Airlines
22 Sep - 30 Sep	Vueling Airlines
24 Sep - 28 Sep	SWISS
27 Sep - 30 Sep	SWISS
22 Sep - 27 Sep	SWISS

Also check the deals for one-way flights from London to Florence 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 Florence in September from $200

Return flights