Cheapest one-way flights from Ontario to Sydney in May from $455

Best time to book flights for Ontario (ONT) to Sydney (SYD) flights at AirHint

AirHint found the following cheapest one-way flights from Ontario (ONT) to Sydney (SYD) in May 2025 (see full year).

One-Way flights

13 May Frontier Airlines
06 May Frontier Airlines
07 May Alaska Airlines
10 May Frontier Airlines
03 May Frontier Airlines
01 May Frontier Airlines
08 May Frontier Airlines
05 May Frontier Airlines
12 May Frontier Airlines
14 May Hawaiian Airlines

Also check the deals for return flights from Ontario to Sydney in May.

Skyscanner

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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