I am in Zigong and want to go to Xi'an. I don't have much money. I would like to ask if there is the cheapest route. Transferring is inevitable. The key is where is the cheapest way to transfer?

It seems that what you are most concerned about is the fare issue

Then the first arrival time cannot be late at night or early in the morning, it should be best in the morning, so I designed this route

K9446 (Yibin---Chengdu)

Zigong (departs at 09:26)

Chengdu (arrives at 15:45)

Hard seat 23 yuan

K292 (Chengdu---Shanghai)

Chengdu (departs at 16:45)

Xi'an (arrives at 09:38)

Hard seat 113 yuan

The whole trip costs 23+113=136 yuan

It is recommended that when you buy the ticket at Zigong Railway Station, you should include the K292 ticket for the next journey from Chengdu to Xi'an Buy it well, and you won't have to queue up at the ticket office to buy tickets after you get to Chengdu. K292 is the original train from Chengdu, so you should check the tickets long in advance. It is recommended that you don't leave the station after getting off the K9446 train in Chengdu, and go directly to the ticket office. Get on the K292 train after it stops at the platform, so you don’t have to leave the station and then enter again