Wait for the bus to the station then hold 29 BT BT chit chit sit etmo etmo to Phaya Thai station, and then walk through the airport between BTS with Darling sat airport to suvarnabhumi airport link lol.
This bus is already waiting in line 29 to the BTS Mor Chit station. Sit down to Mo Chit BTS Phayathai Station and then walk along the link between the BTS and Airport Link. Ride to the Airport Link to Suvarnabhumi Airport here.