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

Return flights

04 Aug - 11 Aug	British Airways
08 Aug - 15 Aug	Air Dolomiti
15 Aug - 19 Aug	ITA Airways
12 Aug - 15 Aug	Air Dolomiti
18 Aug - 26 Aug	ITA Airways
05 Aug - 19 Aug	Air Dolomiti
04 Aug - 08 Aug	British Airways
06 Aug - 11 Aug	Lufthansa
18 Aug - 21 Aug	KLM
13 Aug - 19 Aug	KLM
28 Aug - 11 Sep	SWISS
31 Aug - 05 Sep	British Airways	direct
28 Aug - 01 Sep	SWISS
19 Aug - 02 Sep	British Airways	direct
29 Aug - 02 Sep	British Airways	direct
26 Aug - 09 Sep	KLM
25 Aug - 01 Sep	Lufthansa
23 Aug - 06 Sep	SWISS
30 Aug - 07 Sep	ITA Airways
28 Aug - 02 Sep	British Airways

Also check the deals for one-way flights from London to Skiathos in August.

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 August from $428

Return flights