AirHint found the following cheapest return flights from Ostend (OST) to Kos (KGS) in September 2025 (see full year).
Return flights
| 13 Sep - 20 Sep | TUI fly Belgium | ||
| 01 Sep - 08 Sep | TUI fly Belgium |
Also check the deals for one-way flights from Ostend 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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