At the moment, the cheapest time of year to fly to Don Mueang is January/2020. June/2020 is the most expensive time to fly to Don Mueang.
Thai AirAsia X fly non-stop between Australia and Don Mueang.
The cheapest airline to fly from Australia to Don Mueang is Thai AirAsia X.
Scoot is the best airline to fly between Australia and Don Mueang. For direct flights then Thai AirAsia X is best.