I'm less confident that Uber is going to be operating in Thailand for much longer. News article today quotes the Land Transport Department as continuing to denigrate both Uber and Grab for operating illegally. The taxi unions are in court trying to make it illegal for passengers to use Uber.

Up here in Chiang Mai, surge pricing has been in effect for the last 48 hours or so - no matter what time you try to book an Uber.

This is educated speculation but I suspect the pool of drivers willing to risk legal penalties to drive for Uber is shrinking, thus creating a supply shortage and, in turn, significantly raising prices. The tuk tuk and songtaew mafias continue to photograph drivers dropping off passengers and send the photos of the license plates to the police, who ticket the drivers based upon the photos (says something about the legal system.)

Uber doesn't appear to making any progress with the government to break the impasse wrt their local operations. Enjoy the option while you can.

Edit: (While GrabTaxi may be an option in Bangkok due to the low taxi prices, here in Chiang Mai if you try to order GrabTaxi you get a rate of 85-125 baht for a 2 km ride....about triple the cost of Uber and/or GrabCar.)