Originally Posted by
SKT-DK
By all means, go by the airport train. You can take a taxi or Grab to Makkasan or straight to the airport. For Grab, you can pay by credit card.
Originally Posted by
spinvalve
I have always used Grab in Bangkok with zero issues
I used Grab on my two BKK trips this past year and can highly recommend. Reliable and inexpensive and an easy to use app.