Gan International Airport is connected by SriLankan Airlines via Colombo at the moment. More international airlines are expected to begin operations in the near future.
Addu is a 75 minute flight south of Velana International Airport, Male’. The city has an international airport on Gan which caters to both domestic and international airlines and private jets.
There are numerous daily flights between Male’ and Addu by local airline–Maldivian. Sailing yachts and boats can directly visit Addu since Addu Atoll is among the 3 clearing points in Maldives for international yachts.
A cheaper and more adventurous way of getting here would be to hop on a cargo boat from Male’ and sail through the atolls anchoring at some islands along the way. Although this may take 2-3 days, it definitely lets you enjoy the beauty and interact with lively locals.