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

Return flights

02 Dec - 10 Dec	Fiji Airways
02 Dec - 12 Dec	Fiji Airways
02 Dec - 09 Dec	Qantas	direct
27 Dec - 27 Jan	Qantas	direct
11 Dec - 17 Dec	Fiji Airways
09 Dec - 16 Dec	Fiji Airways
11 Dec - 18 Dec	Fiji Airways
27 Dec - 30 Dec	Qantas	direct
30 Dec - 06 Jan	Qantas	direct
08 Dec - 11 Dec	Fiji Airways
06 Dec - 09 Dec	Qantas	direct
27 Dec - 31 Jan	Qantas	direct
16 Dec - 24 Dec	Fiji Airways
24 Dec - 13 Jan	Qantas	direct
31 Dec - 13 Jan	Fiji Airways
24 Dec - 06 Jan	Qantas	direct
24 Dec - 08 Jan	Virgin Australia
23 Dec - 17 Jan	Qantas	direct
27 Dec - 03 Jan	Qantas	direct
29 Dec - 03 Jan	Air New Zealand

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 $606

Return flights