From Don Mueang, the cheapest and potentially fastest way to get to Hua Lamphong Railway Station is probably by a direct train should the timetable
Ordinary 211: Bangkok Hua Lamphong to Don Mueang Airport by Train
While the actual Don Mueang Airport Rail Link isn’t up yet, the existing railway on the North and Northeastern Lines pass right outside the airport.
Ordinary 208: Don Mueang Airport to Bangkok Hua Lamphong by Train
Don Mueang is the older and smaller airport of Bangkok, which is not yet served by a dedicated airport rail link. Or is it? While