How to travel from Bejing to Lhasa

Generally, there are two ways of travelling from Beijing to Tibet, taking a flight from Beijing to Lhasa or taking the Beijing to Lhasa train.
There are two direct flights a day from Beijing to Lhasa with a stopover in Chengdu and it takes about 5 hours from Beijing to Lhasa. One is operated by Air China, and the other is by China Southern Airlines. The flight departs from Beijing in the morning and arrive in Lhasa in the afternoon. The price is 395USD including airport tax and usually at full fare in peak travel season, at 70%-80% of full fare in low travel season. The flights return to Beijing are the same.
See the flight schedule from Beijing to Lhasa
At present, there is a daily train from Beijing to Lhasa run by China Railways. The train from Beijing to Tibet takes about 44 hours to cover 3753 kilometers, of which 1110 km are over Qinghai-Tibet railway. It departs from the Beijing West Railway Station at 20:09 and arrives at Lhasa Railway Station at 16:00 on the third day after nearly 44 hours. Its operational speed is 120 km/h, 100 km/h over sections laid on permafrost. The Beijing to Lhasa railway route began on July 1st, 2006 and presently costs around RMB1300 for a first-class sleeper berth, around RMB800 for a second-class sleeper berth and half that for a soft seat.
See the train schedule from Beijing to Lhasa