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

Return flights

01 Sep - 15 Sep	Korean Air
01 Sep - 08 Sep	Korean Air
10 Sep - 17 Sep	Korean Air
05 Sep - 16 Sep	Korean Air
07 Sep - 29 Sep	Korean Air
08 Sep - 19 Sep	Korean Air
26 Sep - 24 Oct	Korean Air
19 Sep - 28 Sep	Korean Air
12 Sep - 17 Sep	STARLUX Airlines
20 Sep - 27 Sep	STARLUX Airlines
08 Sep - 15 Sep	STARLUX Airlines
27 Sep - 02 Oct	China Airlines
28 Sep - 08 Oct	China Airlines

Also check the deals for one-way flights from Ontario to Singapore 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 Singapore in September from $708

Return flights