AirHint found the following cheapest return flights from Islip (ISP) to Charleston (CHS) in August 2025 (see full year).

Return flights

30 Aug - 02 Sep	Breeze Airways
20 Aug - 22 Aug	Breeze Airways	direct
12 Aug - 21 Aug	Breeze Airways
28 Aug - 02 Sep	Breeze Airways
19 Aug - 25 Aug	Breeze Airways
01 Aug - 04 Aug	Breeze Airways	direct
16 Aug - 18 Aug	Breeze Airways	direct
21 Aug - 22 Aug	Breeze Airways
29 Aug - 01 Sep	Breeze Airways	direct
25 Aug - 29 Aug	Breeze Airways	direct
09 Aug - 14 Aug	Breeze Airways
30 Aug - 31 Aug	Breeze Airways
22 Aug - 26 Aug	Breeze Airways
28 Aug - 01 Sep	Breeze Airways

Also check the deals for one-way flights from Islip to Charleston 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 Islip to Charleston in August from $98

Return flights