AirHint found the following cheapest return flights from Graz (GRZ) to Kos (KGS) in August 2025 (see full year).

Return flights

24 Aug - 08 Sep	Austrian Airlines
27 Aug - 03 Sep	Austrian Airlines
31 Aug - 05 Sep	Austrian Airlines
17 Aug - 20 Aug	Eurowings	direct
27 Aug - 31 Aug	Eurowings	direct
24 Aug - 27 Aug	Austrian Airlines
24 Aug - 31 Aug	Eurowings	direct
31 Aug - 04 Sep	Eurowings
19 Aug - 25 Aug	Pegasus Airlines
30 Aug - 03 Sep	Lufthansa
30 Aug - 04 Sep	Corendon Airlines Europe

Also check the deals for one-way flights from Graz to Kos 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 Graz to Kos in August from 190€

Return flights