From Xieng Khoung (Laos) to Chieng Rai (Thailand)

Could you show me the cheapest way to go from Xieng Khoung (Laos) to Chieng Rai (Thailand)? Which vehicle can I use?Which gate between Laos and Thailand wil I pass? Thank you very much.

It will take about 20-22 hours by bus to Huay Xai. Change at Luang Prabang.

See bus schedules/fares on
http://hobomaps.com/TravelPDJ.html
http://hobomaps.com/TravelLuangPrabang.html

Then cross the river to Chiang Khong (Thai border) and get a bus to Chiang Rai.