Flights to Tibet
With the development of transportation, more and more vehicles are available for travelers who want to travel to Tibet, such as trains, airplanes, bikes, etc. Among the multiple means of transportation, taking flights to Tibet is the most convenient way. Although the plane ticket fare is not cheap, it can save a lot of time. If you come from United States, Singapore, UK, Australia, Canada, India, Hong Kong, etc., you need to arrive in mainland China or Kathmandu first, then transfer to another flight to Tibet.
The first entrance is via China. There are more than 18 cities for travelers to get to Tibet from mainland China by air, including Beijing, Shanghai, Guangzhou, Chengdu, Chongqing, Xian, Kunming, Shangri-La, Xining, Nanjing, Xiamen, etc. In some major cities like Chengdu, Beijing, and Xian, the number of daily flights ranges from 6 to 17. Chengdu is the gateway city of Southwest China, with the most daily flights(12~17) to Tibet from May to October. Beijing, Chongqing, Xi’an, and Kunming come next. It's advisable to stay one night in the mainland city, either to pick up your Tibet Travel Permit or to buffer potential delays of your international flights.
The second entrance is via Kathmandu - the capital city of Nepal. You can take the direct flight to Lhasa - the capital city of Tibet from Kathmandu. Usually, there're one or two direct daily flights from Kathmandu to Lhasa. It takes about 1hr and 30mins to reach Lhasa from Kathmandu by airplane. As a traveler, if you prefer to enter Lhasa from Kathmandu, please plan at least three days here for your China Group Visa. If possible, you can choose your seats on the left side of the plane to enjoy the summit of Mt. Everest.
No matter where you are from, you have to enter Tibet from the gateway cities of China or Kathmandu. Although the number of flights is plenty, travelers still need to book plane tickets in advance. Because the supplies of air tickets to Tibet always fail to meet the demand during the peak tourist season.
For your reference: Domestic Flights | Airports in Tibet | International Flights | FAQ