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

Return flights

26 Sep - 01 Oct	AirAsia
17 Sep - 22 Sep	AirAsia
10 Sep - 22 Sep	AirAsia
21 Sep - 22 Sep	AirAsia
10 Sep - 19 Sep	AirAsia
17 Sep - 19 Sep	AirAsia
10 Sep - 01 Oct	AirAsia
17 Sep - 01 Oct	AirAsia
21 Sep - 01 Oct	AirAsia
10 Sep - 30 Sep	AirAsia
17 Sep - 30 Sep	AirAsia
21 Sep - 30 Sep	AirAsia
26 Sep - 30 Sep	AirAsia
12 Sep - 22 Sep	AirAsia
12 Sep - 01 Oct	AirAsia

Also check the deals for one-way flights from Colombo 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 Colombo to Knokke in September from $248

Return flights