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

Return flights

20 Aug - 03 Sep	Korean Air
19 Aug - 26 Aug	Delta
04 Aug - 11 Aug	Korean Air
04 Aug - 14 Aug	Korean Air
21 Aug - 30 Aug	Korean Air
17 Aug - 14 Sep	Korean Air
17 Aug - 04 Sep	Korean Air
17 Aug - 03 Sep	Korean Air
17 Aug - 09 Sep	Korean Air
31 Aug - 23 Sep	China Airlines
02 Aug - 09 Aug	Korean Air
20 Aug - 27 Aug	China Airlines
17 Aug - 02 Sep	China Airlines
22 Aug - 05 Sep	China Airlines
13 Aug - 27 Aug	China Airlines
26 Aug - 12 Sep	China Airlines
03 Aug - 14 Aug	China Airlines
07 Aug - 14 Aug	China Airlines
08 Aug - 15 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 $714

Return flights