is it possible to come Jinghong from chiangmai thailand of luangprabang laos?

From Chiangmai Thailand, you can fly to Kunming first and then transfer to another flight to Xishuangbanna. After that, take a taxi to your destination. Or take a bus to Chiang Khong in three hours, from where you can easily go to Houay Xai. At Houay Xai Bus Station, you can take a bus to your destination directly in around 6h. But I heard only one bus is available for this route every day and it leaves at 07:00 in the morning. From Luangprang, you can take a boat to Houay Xai and transfer to a long-distance bus to JH.