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

Return flights

15 Sep - 06 Oct	IndiGo
29 Sep - 07 Oct	AirAsia
20 Sep - 24 Sep	AirAsia
24 Sep - 27 Sep	AirAsia
15 Sep - 17 Sep	IndiGo
29 Sep - 05 Oct	AirAsia
10 Sep - 17 Sep	AirAsia
17 Sep - 29 Oct	IndiGo
08 Sep - 17 Sep	IndiGo
08 Sep - 16 Sep	IndiGo
01 Sep - 03 Oct	IndiGo
30 Sep - 12 Oct	AirAsia
17 Sep - 24 Sep	IndiGo
15 Sep - 22 Sep	IndiGo
05 Sep - 09 Sep	IndiGo
25 Sep - 28 Sep	AirAsia
26 Sep - 03 Oct	IndiGo
27 Sep - 05 Oct	AirAsia
03 Sep - 14 Oct	IndiGo
18 Sep - 02 Oct	IndiGo

Also check the deals for one-way flights from Colombo to Singapore 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 Singapore in September from $257

Return flights