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

Return flights

03 Oct - 13 Oct	transavia
03 Oct - 10 Oct	transavia
06 Oct - 13 Oct	transavia
16 Oct - 23 Oct	transavia
03 Oct - 17 Oct	transavia	direct
03 Oct - 06 Oct	transavia
06 Oct - 20 Oct	transavia
20 Oct - 26 Oct	transavia
24 Oct - 26 Oct	transavia
13 Oct - 19 Oct	transavia
31 Oct - 07 Nov	transavia
30 Oct - 04 Nov	transavia
19 Oct - 02 Nov	transavia

Also check the deals for one-way flights from Rotterdam to Kos in October.

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 Rotterdam to Kos in October from 207€

Return flights