Seoul Gimpo Intl, Jinju Sacheon, and Ulsan are the top three Hi-Air airports based on our airline data. This may change if Hi-Air makes updates to their flight routes due to supply and demand.
Hi-Air does not have flights from Singapore Changi at the moment. There are scheduled flights with Hi-Air out of Jeju City though (if you don’t mind flying from this airport). Flying with Jeju Air is recommended if you still want to fly from Singapore Changi.