hi, i plan to go to Sanya in jan. suggestions for cheap flight & hotel from malaysia? tq

For budget flight, I suggest you fly from Lumpur to Guangzhou first. There you can catch a Chinese domestic flight to SY then. You can pay much attention to the website to know the flight schedule and the fare:
https://www.travelchinaguide.com/china-flights/
You can easily find a budget express hotel there, such as Home Inns and Hanting Express Hotel. SO don't worry! While, generally, the living standard of SY is a little higher. Therefore, you may need prepare about CNY250-300 per day for various cost.