Hi, would like to know the taxi fare from Meilan airport to Wenchang town, and return.

Well, the cab fare is CNY 120 to 140 at that time. It still have some taxies outside the airport. Don't worry.
Or you can take some rest and then take the high-speed train at the airport, get off at Wenchang Railway Station. The earliest schedule is at 09:45. The duration is about 20 mins. The ticket fare of first class seat is CNY17.5 and second class seat is CNY14.5.