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

Return flights

24 Sep - 29 Sep	ITA Airways
23 Sep - 24 Sep	ITA Airways
23 Sep - 30 Sep	ITA Airways
13 Sep - 17 Sep	ITA Airways
27 Sep - 29 Sep	SWISS
30 Sep - 14 Oct	Lufthansa
16 Sep - 22 Sep	SWISS
20 Sep - 22 Sep	SWISS
22 Sep - 30 Sep	ITA Airways
11 Sep - 25 Sep	Lufthansa
13 Sep - 20 Sep	ITA Airways
29 Sep - 02 Oct	Lufthansa
30 Sep - 03 Oct	SWISS
28 Sep - 02 Oct	KLM
24 Sep - 03 Oct	SWISS
29 Sep - 03 Oct	ITA Airways
22 Sep - 01 Oct	KLM
23 Sep - 03 Oct	SWISS
25 Sep - 07 Oct	KLM
30 Sep - 06 Oct	Lufthansa

Also check the deals for one-way flights from London to Skiathos 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 Skiathos in September from 277€

Return flights