AirHint found the following cheapest return flights from Seoul (ICN) to Knokke (KNO) in September 2025 (see full year).

Return flights

02 Sep - 24 Sep	AirAsia X
26 Sep - 29 Sep	Thai AirAsia X
03 Sep - 24 Sep	AirAsia X
02 Sep - 11 Sep	AirAsia X
01 Sep - 11 Sep	AirAsia X
03 Sep - 11 Sep	AirAsia X
02 Sep - 14 Sep	AirAsia X
01 Sep - 14 Sep	AirAsia X
03 Sep - 14 Sep	AirAsia X
02 Sep - 21 Sep	AirAsia X
25 Sep - 03 Oct	AirAsia X
26 Sep - 03 Oct	Thai AirAsia X
29 Sep - 03 Oct	Thai AirAsia X
27 Sep - 12 Oct	AirAsia X
27 Sep - 03 Oct	AirAsia X
25 Sep - 11 Oct	AirAsia X
26 Sep - 11 Oct	Thai AirAsia X
29 Sep - 11 Oct	Thai AirAsia X
27 Sep - 11 Oct	AirAsia X

Also check the deals for one-way flights from Seoul to Knokke 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 Seoul to Knokke in September from 236€

Return flights