Originally Posted by
restlessinRNO
The train fare from the airport to Phaya Thai station is 45 baht each way. You will need to decide whether to spend the night in town or at the airport.

IIRC 150 was the express fare, alas that has not been around for some time.
If it were me, I'd make my way to town. In fact, I've done it when I only ended up being in town for three hours between the time I got off and back on ARL