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

Return flights

03 Sep - 10 Sep	Air India
04 Sep - 11 Sep	IndiGo
01 Sep - 07 Sep	IndiGo
06 Sep - 12 Sep	IndiGo
11 Sep - 16 Sep	IndiGo
25 Sep - 30 Sep	IndiGo
12 Sep - 20 Sep	IndiGo
19 Sep - 26 Sep	IndiGo
19 Sep - 23 Sep	IndiGo
24 Sep - 01 Oct	Air India
24 Sep - 02 Oct	Air India
22 Sep - 02 Oct	IndiGo
26 Sep - 04 Oct	IndiGo
28 Sep - 02 Oct	Air India
28 Sep - 04 Oct	IndiGo
28 Sep - 06 Oct	IndiGo
28 Sep - 05 Oct	IndiGo
27 Sep - 04 Oct	IndiGo
27 Sep - 02 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 $314

Return flights