The airport is 24km from downtown Bangkok.
Taxi - metered taxis are available outside the Arrivals halls. There's an airport surcharge and travelers also pay any toll fees. It is recommended that travelers have the address of their intended destination written in Thai.
Bus - a dozen or so bus routes connect the airport with points around Greater Bangkok. If you're transferring to Suvarnabhumi, Bangkok's other international airport, you can take a free shuttle bus, which runs from 05.00 to 23.00. Though the transfer should only take 1 hour, leave yourself plenty of time as traffic can sometimes double or triple the normal journey duration.
Train - a bridge connects the 2nd Floor of Terminal 1 with Don Muang train station about 500 meters away. From there, trains run every 30 minutes to the central railway station, Hua Lumphong in downtown Bangkok.
Car rental - car rental firms operate from the Arrivals hall in Terminal 1.