AirHint found the following cheapest return flights from Ontario (ONT) to Singapore (SIN) in September 2026 (see full year).
Return flights
| 20 Sep - 27 Sep | Korean Air | ||
| 18 Sep - 23 Sep | China Airlines | ||
| 01 Sep - 15 Sep | China Airlines | ||
| 20 Sep - 02 Oct | China Airlines |
Also check the deals for one-way flights from Ontario to Singapore in September.
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