To enter Tonga, you need:
A passport with at least six months’ validity, and
an onward/return ticket .
Visas are required for stays over 31 days.
For further information about entry requirements, particularly if you plan to enter by sea, you may wish to contact the Embassy of the Kingdom of Tonga located at 250 East 51st Street, New York, NY 10022, telephone 917-369-1024 and 917-369-1025. Tonga also has a Consulate General of Tonga at 1350 Bayshore Highway Suite 610, Burlingame, California 940140; telephone +1-650-685-1001; fax: +1-650-685-1003.