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

Return flights

16 Jul - 23 Jul	Lufthansa
16 Jul - 22 Jul	Lufthansa
02 Jul - 06 Jul	Lufthansa
23 Jul - 30 Jul	Austrian Airlines
17 Jul - 24 Jul	Lufthansa
15 Jul - 22 Jul	Lufthansa
22 Jul - 29 Jul	Lufthansa
24 Jul - 31 Jul	Lufthansa
02 Jul - 06 Jul	Eurowings	direct
06 Jul - 13 Jul	Eurowings	direct

Also check the deals for one-way flights from Graz to Kos in July.

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 July from $246

Return flights