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

Return flights

02 Dec - 09 Dec	Fiji Airways
02 Dec - 13 Dec	Qantas	direct
02 Dec - 09 Dec	Qantas	direct
13 Dec - 18 Dec	Fiji Airways
12 Dec - 24 Dec	Fiji Airways
29 Dec - 03 Jan	Fiji Airways
16 Dec - 24 Dec	Qantas	direct
13 Dec - 18 Dec	Qantas	direct
13 Dec - 17 Jan	Qantas	direct
06 Dec - 03 Jan	Qantas	direct
15 Dec - 26 Dec	Virgin Australia
02 Dec - 03 Jan	Qantas	direct
14 Dec - 24 Dec	Fiji Airways
23 Dec - 30 Dec	Qantas	direct
24 Dec - 13 Jan	Qantas	direct
24 Dec - 08 Jan	Qantas	direct
23 Dec - 13 Jan	Qantas	direct
23 Dec - 10 Jan	Qantas	direct
18 Dec - 03 Jan	Qantas	direct
22 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 458€

Return flights