AirHint found the following cheapest return flights from Auckland (AKL) to Tongatapu (TBU) in September 2025 (see full year).

Return flights

09 Sep - 24 Sep	Fiji Airways
01 Sep - 08 Sep	Fiji Airways
16 Sep - 22 Sep	Fiji Airways
09 Sep - 24 Sep	Air New Zealand	direct
13 Sep - 19 Sep	Air New Zealand
13 Sep - 20 Sep	Air New Zealand
11 Sep - 17 Sep	Fiji Airways
04 Sep - 12 Sep	Fiji Airways
15 Sep - 22 Sep	Air New Zealand	direct
30 Sep - 04 Oct	Fiji Airways
02 Sep - 06 Sep	Fiji Airways
26 Sep - 02 Oct	Fiji Airways
19 Sep - 03 Oct	Fiji Airways
19 Sep - 02 Oct	Fiji Airways

Also check the deals for one-way flights from Auckland to Tongatapu in September.

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 Auckland to Tongatapu in September from 261€

Return flights