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

Return flights

05 Sep - 09 Sep	IndiGo
10 Sep - 17 Sep	IndiGo
10 Sep - 19 Sep	IndiGo
19 Sep - 23 Sep	IndiGo
19 Sep - 23 Sep	SriLankan Airlines	direct
05 Sep - 09 Sep	SriLankan Airlines	direct
29 Sep - 03 Oct	SriLankan Airlines	direct
10 Sep - 17 Sep	SriLankan Airlines	direct
10 Sep - 19 Sep	SriLankan Airlines	direct
30 Sep - 05 Oct	SriLankan Airlines	direct
25 Sep - 06 Oct	SriLankan Airlines	direct
02 Sep - 09 Sep	SriLankan Airlines	direct
06 Sep - 10 Sep	IndiGo

Also check the deals for one-way flights from Kochi to Colombo 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 Kochi to Colombo in September from $245

Return flights