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

Return flights

08 Dec - 15 Dec	Korean Air
04 Dec - 08 Dec	Korean Air
04 Dec - 23 Dec	Korean Air
07 Dec - 23 Dec	Korean Air
04 Dec - 11 Dec	Korean Air
09 Dec - 09 Jan	Korean Air
10 Dec - 10 Jan	Alaska Airlines
03 Dec - 31 Dec	United
28 Dec - 10 Jan	China Airlines
16 Dec - 16 Jan	China Airlines
14 Dec - 11 Jan	China Airlines
23 Dec - 06 Jan	China Airlines
13 Dec - 03 Jan	STARLUX Airlines
18 Dec - 07 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 $780

Return flights