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

Return flights

03 Oct - 10 Oct	United
12 Oct - 19 Oct	China Airlines
05 Oct - 19 Oct	China Airlines
01 Oct - 12 Oct	China Airlines
24 Oct - 28 Oct	China Airlines
14 Oct - 21 Oct	China Airlines
12 Oct - 20 Oct	China Airlines
07 Oct - 18 Oct	China Airlines
05 Oct - 05 Nov	China Airlines
15 Oct - 18 Nov	China Airlines
04 Oct - 08 Oct	STARLUX Airlines
04 Oct - 11 Oct	STARLUX Airlines
19 Oct - 11 Nov	China Airlines

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

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 October from $789

Return flights