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

Return flights

06 Dec - 15 Dec	Korean Air
29 Dec - 26 Jan	Korean Air
29 Dec - 24 Jan	Korean Air
03 Dec - 18 Dec	Korean Air
29 Dec - 17 Jan	Korean Air
27 Dec - 26 Jan	Korean Air
30 Dec - 08 Jan	Korean Air
10 Dec - 18 Dec	Korean Air
10 Dec - 23 Dec	Korean Air
01 Dec - 16 Dec	Korean Air
04 Dec - 11 Dec	Korean Air
08 Dec - 17 Dec	STARLUX Airlines
01 Dec - 12 Dec	STARLUX Airlines
05 Dec - 24 Dec	STARLUX Airlines
08 Dec - 19 Dec	STARLUX Airlines
25 Dec - 21 Jan	Korean Air
25 Dec - 20 Jan	Korean Air
28 Dec - 23 Jan	Korean Air
26 Dec - 21 Jan	STARLUX Airlines
26 Dec - 20 Jan	China Airlines

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

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 December from $774

Return flights