Cheapest return flights from Islip to Sydney in December from 1592€

AirHint found the following cheapest return flights from Islip (ISP) to Sydney (SYD) in December 2025 (see full year).

Return flights

06 Dec - 13 Dec Frontier Airlines

Also check the deals for one-way flights from Islip to Sydney in December.

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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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