AirHint found the following cheapest return flights from Vienna (VIE) to Kos (KGS) in September 2025 (see full year).

Return flights

11 Sep - 17 Sep	Ryanair	direct
16 Sep - 17 Sep	Ryanair	direct
09 Sep - 17 Sep	Ryanair	direct
03 Sep - 17 Sep	Ryanair	direct
10 Sep - 17 Sep	Ryanair	direct
11 Sep - 20 Sep	Ryanair	direct
16 Sep - 20 Sep	Ryanair	direct
09 Sep - 20 Sep	Ryanair	direct
03 Sep - 20 Sep	Ryanair	direct
17 Sep - 20 Sep	Ryanair	direct
30 Sep - 10 Oct	Ryanair
28 Sep - 19 Oct	Ryanair
30 Sep - 19 Oct	Ryanair
19 Sep - 04 Oct	Ryanair
20 Sep - 04 Oct	Condor	direct
26 Sep - 01 Oct	Ryanair
28 Sep - 11 Oct	Ryanair
23 Sep - 11 Oct	Ryanair
30 Sep - 11 Oct	Ryanair
24 Sep - 11 Oct	Ryanair

Also check the deals for one-way flights from Vienna to Kos in September.

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 Vienna to Kos in September from 92€

Return flights