The principle of purchasing tickets in different places is that you can only buy tickets from the starting station. You can only buy tickets from Jinan to Xi 'an in Dongying. The following itinerary meets your requirements:
Train type departure station departure time destination station arrival time mileage terminal station hard seat hard sleeper soft sleeper
K 15 air-conditioning express Jinan 10:02 Xi An next day 0 1:09 15 hours and 7 minutes 1 179 Chongqing North150 2654/kloc-0.
1 16 1 Pukuai Jinan Jinan 13:28 Xi 'an 08:53 19 hours and 25 minutes 106 1 Xi 'an 681.
1085 Pukuai Jinan 09:28 Xi 'an 00:28 15 hours 0: 1 179 Urumqi 73 153 254.
Student tickets are booked in advance 15 days.
EMU (D prefix, C prefix) and through train (Z prefix) sell tickets 10 days in advance;
Other trains (T, K, N, A, Puke) are sold five days in advance;
The date is calculated as follows: Tickets will be sold at 9: 00 am on the 10(5) day from the boarding date (inclusive).
Good luck!