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

Return flights

23 Sep - 30 Sep	Air India
23 Sep - 27 Sep	Air India	direct
24 Sep - 26 Sep	Air India
24 Sep - 29 Sep	Air India
22 Sep - 29 Sep	Air India	direct
25 Sep - 30 Sep	Air India	direct
25 Sep - 29 Sep	Air India	direct
20 Sep - 27 Sep	Air India	direct
20 Sep - 23 Sep	Air India	direct
24 Sep - 27 Sep	Air India
30 Sep - 14 Oct	Air India
30 Sep - 16 Oct	Air India
30 Sep - 12 Oct	Air India
25 Sep - 02 Oct	Air India
25 Sep - 01 Oct	Air India
24 Sep - 02 Oct	Air India
23 Sep - 02 Oct	Air India
24 Sep - 01 Oct	Air India
25 Sep - 02 Oct	SriLankan Airlines	direct
29 Sep - 06 Oct	Air India

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 $240

Return flights