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

Return flights

11 Aug - 25 Aug	STARLUX Airlines
08 Aug - 16 Aug	STARLUX Airlines
13 Aug - 27 Aug	STARLUX Airlines
23 Aug - 01 Sep	STARLUX Airlines
16 Aug - 23 Aug	STARLUX Airlines
24 Aug - 29 Aug	China Airlines
19 Aug - 02 Sep	China Airlines
17 Aug - 30 Sep	China Airlines
07 Aug - 02 Sep	China Airlines
17 Aug - 02 Sep	China Airlines
05 Aug - 19 Aug	China Airlines
05 Aug - 18 Aug	China Airlines
08 Aug - 13 Aug	STARLUX Airlines
04 Aug - 09 Aug	China Airlines

Also check the deals for one-way flights from Ontario to Singapore in August.

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 August from 842€

Return flights