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

Return flights

18 Jun - 30 Jul	Alaska Airlines
24 Jun - 16 Jul	Alaska Airlines
07 Jun - 25 Jun	Alaska Airlines
24 Jun - 03 Jul	Alaska Airlines
03 Jun - 15 Jun	Alaska Airlines
15 Jun - 22 Jun	Alaska Airlines
03 Jun - 06 Jul	Alaska Airlines
24 Jun - 02 Jul	Alaska Airlines
01 Jun - 08 Jun	China Airlines
19 Jun - 16 Jul	China Airlines
15 Jun - 27 Jul	China Airlines
03 Jun - 21 Jun	China Airlines
30 Jun - 11 Jul	Alaska Airlines
26 Jun - 03 Jul	China Airlines
08 Jun - 14 Jun	Qatar Airways
26 Jun - 11 Jul	Qatar Airways
15 Jun - 20 Jun	Qatar Airways
14 Jun - 20 Jun	Qatar Airways

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

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.

Book a cheap hotel in Sydney

Cheap car rent in Sydney

Cheapest return flights from Ontario to Sydney in June from $1035

Return flights