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

Return flights

02 Dec - 05 Dec	Fiji Airways
18 Dec - 24 Dec	Fiji Airways
27 Dec - 08 Jan	Qantas	direct
13 Dec - 27 Dec	Qantas	direct
18 Dec - 24 Dec	Qantas	direct
14 Dec - 05 Jan	Fiji Airways
26 Dec - 07 Jan	Fiji Airways
18 Dec - 03 Jan	Fiji Airways
24 Dec - 08 Jan	Qantas	direct
18 Dec - 03 Jan	Qantas	direct
20 Dec - 03 Jan	Qantas	direct
19 Dec - 02 Jan	Fiji Airways

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

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 Sydney to Tongatapu in December from $624

Return flights