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

Return flights

04 Sep - 15 Sep	Condor	direct
08 Sep - 15 Sep	Condor	direct
18 Sep - 22 Sep	Condor	direct
15 Sep - 22 Sep	Condor	direct
17 Sep - 27 Sep	easyJet
23 Sep - 27 Sep	easyJet
04 Sep - 09 Sep	Condor
09 Sep - 15 Sep	easyJet
11 Sep - 15 Sep	Condor	direct
17 Sep - 24 Sep	easyJet
24 Sep - 07 Oct	easyJet
26 Sep - 07 Oct	Eurowings
26 Sep - 01 Oct	Eurowings
26 Sep - 05 Oct	Eurowings
30 Sep - 07 Oct	SWISS
26 Sep - 03 Oct	Eurowings
28 Sep - 05 Oct	Aegean Airlines
28 Sep - 02 Oct	Eurowings
26 Sep - 04 Oct	Eurowings
27 Sep - 05 Oct	easyJet

Also check the deals for one-way flights from Zurich 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 Zurich to Kos in September from $214

Return flights