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

Return flights

28 Oct - 04 Nov	Fiji Airways
10 Oct - 17 Oct	Fiji Airways
18 Oct - 21 Oct	Fiji Airways
14 Oct - 21 Oct	Qantas	direct
18 Oct - 28 Oct	Qantas	direct
18 Oct - 21 Oct	Qantas	direct
04 Oct - 07 Oct	Qantas	direct
15 Oct - 18 Oct	Fiji Airways
08 Oct - 31 Oct	Fiji Airways
28 Oct - 04 Nov	Qantas	direct
03 Oct - 06 Oct	Fiji Airways
02 Oct - 07 Oct	Fiji Airways

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

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 October from 365€

Return flights