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

Return flights

12 Sep - 19 Sep	transavia	direct
23 Sep - 29 Sep	Ryanair
14 Sep - 23 Sep	TUI fly Belgium	direct
18 Sep - 23 Sep	TUI fly Belgium	direct
14 Sep - 18 Sep	TUI fly Belgium	direct
23 Sep - 29 Sep	TUI fly Belgium	direct

Also check the deals for one-way flights from Kos to Rotterdam 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 Kos to Rotterdam in September from $184

Return flights