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

One-Way flights

22 Sep	IndiGo
14 Sep	Air India
27 Sep	Air India
22 Sep	Air India	direct
14 Sep	Air India	direct
27 Sep	Air India	direct
30 Sep	Air India
30 Sep	Air India	direct
03 Sep	Air India	direct
08 Sep	Air India	direct

Also check the deals for return 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 one-way flights from Delhi to Colombo in September from 114€

One-Way flights