Chengdu, Lhasa, and Xi'an Xianyang are the top three Tibet Airlines airports based on our airline data. This may change if Tibet Airlines makes updates to their flight routes due to supply and demand.
A flight from Shenzhen to Chengdu, which has 0 stops, is S$ 292 which is the least expensive round-trip domestic flight that Tibet Airlines offers. For a one-way domestic Tibet Airlines flight, the cheapest route is Chongqing Jiangbei Intl to Lhasa (0 stops) for S$ 106.
Tibet Airlines does not have flights from Singapore Changi at the moment. There are scheduled flights with Tibet Airlines out of Sanya Phoenix Intl though (if you don’t mind flying from this airport). Flying with Sichuan Airlines is recommended if you still want to fly from Singapore Changi.