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

Return flights

16 Aug - 22 Aug	Fiji Airways
16 Aug - 23 Aug	Fiji Airways
12 Aug - 19 Aug	Fiji Airways
12 Aug - 29 Aug	Fiji Airways
16 Aug - 23 Aug	Qantas	direct
30 Aug - 06 Sep	Qantas	direct
05 Aug - 12 Aug	Fiji Airways
26 Aug - 16 Sep	Qantas	direct
18 Aug - 30 Aug	Fiji Airways
09 Aug - 12 Aug	Qantas	direct
05 Aug - 26 Aug	Qantas	direct
12 Aug - 19 Aug	Qantas	direct
02 Aug - 02 Sep	Qantas	direct
27 Aug - 17 Sep	Fiji Airways

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

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 August from 385€

Return flights