2014 Loi Krathong

Certain districts of Bangkok have been put on notice that sky borne lanterns are outlawed near areas of flightpath and the airports.

A similar notice may be made for the area near the Sakon Nakhon airport.
During past years of one flight per day these floating lanterns were not a problem.

Nowadays there is a 9:30 pm airport departure.  Possibly depending on wind directions that evening, the lanterns will most likely be outlawed or delayed anywhere near the airport.