There is neither flight from Beijing to Xingtai nor from Xingtai to Weifang. You can take train from Beijing West Station to Xingtai. It takes about 3~5 hours. For the exact time, you can search throught the timetable of Beijing Trains(https://www.travelchinaguide.com/china-trains/beijing-schedule.htm) . There is no direct train from Xingtai to Weifang, you may need to transfer at Shijiazhuang. Check China Train Timetable(https://www.travelchinaguide.com/china-trains/) , you will get the information you need.