@AliJames ****
3000 is really cheap. it will take1-1
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hour to nakhon phanon (passing the border) and from nakhon phanom to the airport at least another two hours.
only cars with a special passport can cross the border and most probably the driver wont find anyone for going back to thakhek.
if u want it cheaper just take the bus and sleep one night in nakhon phanom. that should be under 1k