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

Return flights

22 Aug - 29 Aug	Fiji Airways
22 Aug - 30 Aug	Fiji Airways
23 Aug - 30 Aug	Qantas	direct
23 Aug - 02 Sep	Qantas	direct
31 Aug - 04 Sep	Jetstar
16 Aug - 23 Aug	Qantas	direct
16 Aug - 26 Aug	Qantas	direct
19 Aug - 21 Aug	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 537€

Return flights