Buses from Jinghong usually take around 2.5 to 3 hours. Buses leave Jinghong between 7AM and 6PM and cost ¥42 (April 2012).
This is the first big town/city for travelers arriving from Laos. Buses from Luang Namtha in Laos take around 4 hours. You will usually need at least an hour at the Chinese/Laos border to deal with visa issues etc.
It would be wise to have some local currency before-hand. There is a Laotian bank about 800m from the border on the Laotian side that exchanges Laotian Kip to RMB at normal rates, but the Luang Namtha bus does not stop there. The ladies who convert Kip around the Chinese border don't give a good rate, Banks in Mengla exchange currency at market rates. There are many banks that accept international ATM cards such as China Construction Bank and Bank of China.
When you arrive by bus you may be taken to a depot. There is a ticketing station across the road, perhaps 200m north.
To Mohan - Lao border and Southern.
There are frequent mini buses daily to Mohan - international Lao-China border check point direction from Mengla bus station (previously from Southern (mini) bus station which is not working anylonger obviously as now all traffic begins and ends at that new station). You need to buy ticket at the counter first - it will print buses licence number on it and that one you'll have to take. Staff doesn't speak english but if you ask one guy that does and has been around transit points in Mengla for ages, he'll charge comission.
It takes roughly 1,5 hour driving to get to Mohan and there you'll need to take Xixuanbanna-style tuk-tuk to the border with Laos. It's nice drive and there are some really nice Dai villages by the route.
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