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

Return flights

16 Sep - 23 Sep	Ryanair
02 Sep - 20 Sep	Ryanair	direct
15 Sep - 23 Sep	SWISS
25 Sep - 29 Sep	Lufthansa
02 Sep - 06 Sep	Ryanair	direct
02 Sep - 09 Sep	Ryanair	direct
06 Sep - 13 Sep	Ryanair	direct
13 Sep - 20 Sep	Ryanair	direct
16 Sep - 27 Sep	Ryanair	direct
04 Sep - 15 Sep	Aer Lingus
23 Sep - 04 Oct	Ryanair
16 Sep - 04 Oct	Ryanair	direct
23 Sep - 04 Oct	Ryanair	direct
20 Sep - 04 Oct	Ryanair	direct

Also check the deals for one-way flights from Dublin 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.

Book a cheap hotel in Kos

Cheap car rent in Kos

Cheapest return flights from Dublin to Kos in September from $195

Return flights