How did you go from the Thai border to Udon Thani airport? I had trouble then....had to pay 80 baht tuk tuk to the bus station (double the price as Thai) and then 200 baht for a taxi van to airport. The taxis near the border were quoting 800 baht down to 600, but I just refused that.
Can do a full report if people interested. Entered line at 11:10 and finished around 12:30. Must be busy day. I'm in the 500s for pickup so I will get there Tuesday at around 2:30