AirHint found the following cheapest return flights from Ontario (ONT) to Sydney (SYD) in April 2026 (see full year).

Return flights

01 Apr - 22 Apr	United
21 Apr - 11 May	United
01 Apr - 26 Apr	Alaska Airlines
01 Apr - 11 Apr	Air New Zealand
01 Apr - 12 Apr	Air New Zealand
09 Apr - 14 May	Alaska Airlines
06 Apr - 12 Apr	China Airlines
01 Apr - 08 Apr	China Airlines
25 Apr - 10 May	China Airlines
01 Apr - 15 Apr	China Airlines
21 Apr - 01 May	China Airlines
03 Apr - 10 Apr	China Airlines
23 Apr - 06 May	Qatar Airways
30 Apr - 12 May	Qatar Airways
30 Apr - 04 May	Qatar Airways

Also check the deals for one-way flights from Ontario to Sydney in April.

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 Sydney in April from $963

Return flights