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

Return flights

15 Sep - 23 Sep	IndiGo
21 Sep - 29 Sep	IndiGo
05 Sep - 11 Sep	IndiGo
10 Sep - 17 Sep	IndiGo
16 Sep - 20 Sep	IndiGo
20 Sep - 28 Sep	IndiGo
25 Sep - 04 Oct	Air India
26 Sep - 04 Oct	Air India
27 Sep - 04 Oct	Air India
23 Sep - 07 Oct	Air India
25 Sep - 02 Oct	IndiGo
27 Sep - 03 Oct	Air India
28 Sep - 05 Oct	Air India
27 Sep - 05 Oct	Air India
30 Sep - 06 Oct	Air India
30 Sep - 07 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 266€

Return flights