Thailand has two airports in and just outside Bangkok. Suvarnabhumi is the new airport, located in Samut Prakan Province. All international flights and some domestic flights operate from here. Don Muang Airport, located on Vibhavadi Rangsit Road, Bangkok serves non-connecting flights of Thai Airways, all domestic flights of Nok Air and some domestic flights of Orient Thai (One-Two-Go).
There are many bus and van services between Suvarnabhumi and Don Muang Airports:
No. 554 Suvarnabhumi - Don Muang:
Suvarnabhumi - Ram Indra Road - Lak Si - Vibhavadi Rangsit Road - Don Muang.
No. 555 Suvarnabhumi - Rangsit (Expressway):
Department of Employment - PTT Don - Muang - Vibhavadi Rangsit Junction – Rangsit.
A free shuttle bus will take you from the Domestic Terminal to the International Terminal within Don Muang.
Limousines are operated by three companies, Airport Associate Limousine, Thai Limousine, and Phrapirab Limousine. They all have the same fares, starting from 650 baht for downtown Bangkok. Contact them at the International Arrival Halls and Domestic Passenger Terminals.
You will find an airport taxi stand just outside the arrivals building where you can book a taxi-meter. Most destinations in downtown Bangkok cost around 200-250 baht. Besides the meter fare, there is also an airport surcharge of 50 baht and a toll of 30/40 baht if you take the highway toll.
There are four bus routes which cover four main areas of Bangkok:
Route A1 (South): Don Muang – Silom
Route A2 (West): Don Muang – Sanam Luang (Grand Palace)
Route A3 (East): Don Muang- Phra Khanong (Sukhumvit)
Route A4: Don Muang – Bangkok Railway Station (Hua Lamphong)
These buses are the cheapest method to get from the airport to downtown Bangkok, much cheaper than the airport buses, however they can be pretty crowded especially during rush hours and not practical, especially if you have a lot of luggage.
There are five routes for air con buses going from the airport to different main areas in Bangkok.
Route 4 Airport – Silom Rd.
Route 29 Airport – Victory Monument – Bangkok Railway Station (Hua Lamphong)
Route 10 Airport – Victory Monument – Southern Region Bus Terminal
Route 13 Airport – Sukhumvit Rd. – Eastern Region Bus Terminal
You are also able to get into Bangkok from the airport by train. The Don Muang Station is located across the highway and opposite the Amari Airport Hotel. The trains arrive/depart from the airport station every 30/60 minutes, but this can be longer at weekends. It can take an hour or more during rush hour to Hua Lamphong, the main station in central Bangkok.
Click here for what to see and do in Bangkok.