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

Return flights

27 Sep - 05 Oct	IndiGo
19 Sep - 02 Oct	Etihad Airways
18 Sep - 23 Sep	Air Arabia
15 Sep - 22 Sep	Air Arabia
23 Sep - 30 Sep	Air Arabia
25 Sep - 30 Sep	Air Arabia
19 Sep - 23 Sep	Air Arabia
16 Sep - 26 Sep	Etihad Airways
13 Sep - 20 Sep	Air Arabia
24 Sep - 28 Oct	Etihad Airways
06 Sep - 13 Sep	Air Arabia
19 Sep - 02 Oct	Turkish Airlines	direct
19 Sep - 23 Sep	Turkish Airlines	direct
24 Sep - 28 Oct	Turkish Airlines	direct
18 Sep - 23 Sep	Turkish Airlines	direct
27 Sep - 05 Oct	Turkish Airlines	direct

Also check the deals for one-way flights from Colombo to Istanbul 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 Colombo to Istanbul in September from 373€

Return flights