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

Return flights

25 Sep - 11 Oct	Air India
03 Sep - 14 Sep	Air India
04 Sep - 10 Sep	Air India
03 Sep - 10 Sep	Air India
03 Sep - 11 Sep	Air India
03 Sep - 09 Sep	Air India
02 Sep - 05 Sep	Air India
13 Sep - 21 Sep	Air India
05 Sep - 09 Sep	IndiGo
25 Sep - 30 Sep	Air India
05 Sep - 17 Sep	Air India
25 Sep - 01 Oct	Air India
25 Sep - 02 Oct	Air India
24 Sep - 02 Oct	Air India
25 Sep - 03 Oct	Air India
26 Sep - 02 Oct	Air India
26 Sep - 01 Oct	Air India
26 Sep - 06 Oct	IndiGo
26 Sep - 04 Oct	Air India
28 Sep - 04 Oct	Air India

Also check the deals for one-way flights from Kolkata 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 Kolkata to Colombo in September from 186€

Return flights