AirHint found the following cheapest return flights from Keffallinia (EFL) to Istanbul (IST) in August 2025 (see full year).

Return flights

17 Aug - 20 Aug	Aegean Airlines
18 Aug - 21 Aug	Aegean Airlines
31 Aug - 16 Sep	SKY express
24 Aug - 06 Sep	SKY express
31 Aug - 19 Sep	SKY express
31 Aug - 06 Sep	SKY express
17 Aug - 06 Sep	SKY express
03 Aug - 15 Aug	SKY express
03 Aug - 18 Aug	SKY express
03 Aug - 20 Aug	SKY express
03 Aug - 12 Aug	SKY express
03 Aug - 21 Aug	SKY express
03 Aug - 09 Aug	SKY express
24 Aug - 27 Aug	SKY express
17 Aug - 21 Aug	SKY express

Also check the deals for one-way flights from Keffallinia to Istanbul 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 Keffallinia to Istanbul in August from 292€

Return flights