AirHint found the following cheapest return flights from Ontario (ONT) to Jakarta (CGK) in September 2025 (see full year).

Return flights

27 Sep - 02 Oct	China Airlines
29 Sep - 24 Oct	China Airlines
25 Sep - 30 Sep	China Airlines
19 Sep - 13 Oct	STARLUX Airlines
23 Sep - 13 Oct	China Airlines
20 Sep - 21 Sep	China Airlines
21 Sep - 12 Oct	China Airlines
23 Sep - 12 Oct	China Airlines

Also check the deals for one-way flights from Ontario to Jakarta 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 Ontario to Jakarta in September from $903

Return flights