AirHint found the following cheapest one-way flights from Kos (KGS) to Athens (ATH) in September 2025 (see full year).

One-Way flights

09 Sep	SKY express	direct
30 Sep	SKY express	direct
16 Sep	SKY express	direct
22 Sep	SKY express	direct
23 Sep	SKY express	direct
17 Sep	SKY express	direct
11 Sep	SKY express	direct
18 Sep	SKY express	direct
27 Sep	SKY express	direct
19 Sep	SKY express	direct

Also check the deals for return flights from Kos to Athens 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 Athens

Cheap car rent in Athens

Cheapest one-way flights from Kos to Athens in September from $39

One-Way flights