I suggest you take the 1 line to Xiaoximen, stay for one night, take the airport bus to 25 yuan/person, and go online to buy a group.
Then take the shuttle bus from Kunming to Jinghong at the South Passenger Station. The fare is 259 yuan. It takes about 7 hours from 8 am to afternoon 10.
Return: From Jinghong Bus Terminal to South Bus Station, and then take Line 4 to Changshui Airport.
Kunming Nanbu bus station
Address: Yi 'an Road, Kunming