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

Return flights

04 Sep - 12 Sep	Air India
05 Sep - 05 Sep	Air India
11 Sep - 12 Sep	Air India
06 Sep - 10 Sep	Air India
26 Sep - 29 Sep	Air India	direct
25 Sep - 28 Sep	Air India	direct
11 Sep - 16 Sep	Air India
26 Sep - 30 Sep	Air India
18 Sep - 23 Sep	Air India
03 Sep - 06 Sep	Air India
26 Sep - 03 Oct	Air India
26 Sep - 03 Oct	SriLankan Airlines	direct
26 Sep - 05 Oct	SriLankan Airlines	direct

Also check the deals for one-way flights from Delhi 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 Delhi to Colombo in September from 347CAD

Return flights