If you are looking to fly to Tonga for less, look to airlines like Fiji Airways, Virgin Australia, and Air New Zealand, with prices starting at $155, $221, and $333 respectively.
Tonga has restricted entry of travelers and airline crew arriving from or transiting through China, Taiwan, Hong Kong, or Macau. Tongan nationals and permanent residents and their immediate family members may still enter Tonga, as may airline crew on direct flights from China who have been using appropriate personal protective equipment (PPE). Travelers arriving from other origins may still enter Tonga, provided they have stayed in a country with no confirmed cases of coronavirus (COVID-19) for at least 14 days directly prior to entering Tonga. They must have an official medical clearance undertaken within 3 days prior to arrival in Tonga. If you are planning to travel to Tonga at this time, it is recommended that you stay up to date on current restrictions and follow proper safety measures while in public.