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

Return flights

29 Sep - 06 Oct	Croatia Airlines
30 Sep - 08 Oct	Austrian Airlines
30 Sep - 10 Oct	Brussels Airlines
20 Sep - 08 Oct	Vueling Airlines
30 Sep - 07 Oct	Austrian Airlines
07 Sep - 16 Sep	Austrian Airlines
02 Sep - 10 Sep	Austrian Airlines
03 Sep - 10 Sep	Austrian Airlines
29 Sep - 01 Oct	Vueling Airlines
08 Sep - 11 Sep	KLM
28 Sep - 14 Oct	KLM
07 Sep - 17 Sep	Austrian Airlines
07 Sep - 11 Sep	KLM
14 Sep - 22 Sep	SWISS
15 Sep - 21 Sep	SWISS
21 Sep - 01 Oct	SWISS
01 Sep - 11 Sep	KLM
16 Sep - 24 Sep	KLM
26 Sep - 05 Oct	Croatia Airlines
27 Sep - 01 Oct	British Airways

Also check the deals for one-way flights from London to Split 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 Split in September from 173€

Return flights