How much by taxi from Xining railway station to Lehe Youth Hostel and from hostel to airport.

From the railway station to your hostle, there is about 4km, so the taxi fare is around 8 to 9RMB.
From your hotstle, taking taxi direct to reach the airport costs about 100RMB.
If you can take a taxi to reach the Bayi Road Bus Terminal, where you can find the airport shuttle bus to reach the airport. The taxi fare is around 10RMB.

Hi Harry,
Thanks for the information re-taxi fare. How many kilometers is it from Lehe Hostel to Airport.

There is about 38km between the airport and your hostle.