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

Return flights

08 Sep - 12 Sep	Air India Express
08 Sep - 11 Sep	Air India Express
07 Sep - 12 Sep	Air India Express
07 Sep - 11 Sep	Air India Express
01 Sep - 12 Sep	Air India Express
01 Sep - 06 Sep	Air India Express
01 Sep - 11 Sep	Air India Express
09 Sep - 12 Sep	Air India Express
09 Sep - 11 Sep	Air India Express
03 Sep - 12 Sep	Air India Express
26 Sep - 01 Oct	IndiGo
28 Sep - 06 Oct	Air India
29 Sep - 06 Oct	Air India
28 Sep - 05 Oct	Air India
26 Sep - 05 Oct	Air India
27 Sep - 05 Oct	Air India
29 Sep - 03 Oct	Air India
29 Sep - 04 Oct	Air India
30 Sep - 04 Oct	IndiGo
28 Sep - 04 Oct	Air India

Also check the deals for one-way flights from Kolkata 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 Kolkata to Singapore in September from $214

Return flights