Naha International Airport has direct international connections with Hong Kong, Seoul, Shanghai, Singapore and Taipei. Connections with mainland Japan include Fukuoka, Osaka, Nagoya and Tokyo; significant discounts (tabiwari on All Nippon Airways and sakitoku on JAL) can sometimes be had if you purchase tickets a month in advance. Note that this is only a partial list; services from most large Japanese cities fly into Naha.
Naha also has air connections with Ishigaki-jima, Kume-jima, Miyako-jima and Yoron-tō, among other Southwest Islands.
As well as JAL and ANA, try searching these low-cost carriers, which may well have discount flights between Naha and where you wish to fly: