From Xian airport to Jinglin tombs

You may mean Hanyangling, the tomb of Emperor Jingdi. There is no direct bus going from the airport to the tomb. You can take a taxi but it is costly. Upon arrival at the airport, you can take shuttle bus line 6 to Xianyang Railway Station, then take bus 5 from the Railway Station to Yangling Mausoleum of the Han Dynasty directly.