Great question - SUB to SHA just means Surabaya Juanda Airport to Shanghai Hongqiao Intl Airport. Now you’ll know what these unique codes when you look for flights! This flight route has multiple associated airports, so we think it might be helpful to learn the name and codes of them as well. They are Shanghai Pu Dong Airport (PVG), Hangzhou Airport (HGH), Wuxi Airport (WUX), Nantong Airport (NTG), Suzhou Airport (SZV). Find deals