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

Return flights

26 Sep - 03 Oct	SriLankan Airlines
29 Sep - 03 Oct	SriLankan Airlines
11 Sep - 16 Sep	ANA
20 Sep - 26 Sep	SriLankan Airlines
13 Sep - 20 Sep	SriLankan Airlines
03 Sep - 10 Sep	Japan Airlines
29 Sep - 02 Oct	Japan Airlines
10 Sep - 22 Sep	SriLankan Airlines
19 Sep - 22 Sep	SriLankan Airlines
13 Sep - 22 Sep	SriLankan Airlines
19 Sep - 23 Sep	Japan Airlines
07 Sep - 06 Oct	Malaysia Airlines
20 Sep - 23 Sep	Japan Airlines
02 Sep - 08 Sep	Japan Airlines

Also check the deals for one-way flights from Osaka 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 Osaka to Colombo in September from 773€

Return flights