The Bangkok Airport Rail Link is the cheapest and fastest way out of the Suvarnabhumi Airport and into downtown Bangkok. You can board the train in the Basement of the Suvarnabhumi Airport.
The Airport Rail link operates daily from 06:00 to 24:00, with commuter City Line trains departing every 10 minutes during peak hours (06:00-09:00 and 16:00-20:00) and 15 minutes off peak and weekends.
Bangkok Airport Rail Link Fares
Standard fare for the City Line is between 15–45 baht depending on distance.
Suvarnabhumi Airport to Phayathai Station
(BTS – sky train interchange) fare is 45 baht
Airport Rail Link Stations
Suvarnabhumi Airport – Lad Krabang – Ban Thap Chang – Hua Mark – Ramkhamhaeng – Makkasan (City Air Terminal – interchange with MRT Blue Line (Phetchaburi Station)) – Ratchaprarop – Phayathai (interchange with BTS Sukhumvit Line (Phayathai Station))
The express train will take you directly to Phayatai Station (N2), where you can connect to the Skytrain (BTS Sukhumvit Line: N2 to Siam (CEN) then take a taxi to Arnoma Grand Bangkok (Approximately 1 km from BTS Siam station to Arnoma Grand Bangkok.
Metered taxis are the easiest way to get out of the airport and to your destination (Arnoma Grand Bangkok). Once you clear customs and immigration, head downstairs to the Ground level, there will be a taxi line outside. You'll stop at a desk and tell the clerk your destination and then they will assign you to the next available driver or receive a ticket from a taxi queue machine, proceed to the lane number printed on your ticket.
You must pay an additional 50 baht above the meter fare, plus any tolls. The fastest way to get into the city is on the expressway, tolls will cost you an additional 75 baht or more depending on where you are going.
Taxi from airport to the Arnoma Grand Bangkok: appox. THB 500-600 + THB 75 toll+ THB 50 Airport Taxes
Most taxi drivers are honest but some will try to give you a flat rate to take you to your hotel. Insist on the meter!
Please see detail this link below:
https://www.aot-limousine.com/