The new airport rail connection to and from Bangkok’s Suvarnabhumi International Airport has had some trial runs and will officially open on August 23. From that date to the end of the year, the fares will be discounted.
There are two lines:
SA Express has only two stops: the airport itself and Makkasan Station. Trains run every 30 minutes from 6am-midnight. Introductory fare is 100 baht each way and it takes only 15 minutes.
SA City Line begins a bit farther down the line from the airport at Rajprarop Station and takes 30 minutes to complete the entire trip. But this is due to the additional stops at Makkasan, Ramkhamhaeng, Huamark and Ban Tubchang Stations. Departures are every 15 minutes within the same hours as the Express and the fare until the end of the year is only 15 baht each way.
After the New Year, those introductory fares will go up to 150 baht for the Express and 15-45 baht for the regular train (depending on your station).
Bangkok’s airport rail line does tie into the city system: with the BTS Skytrain at Phayathai Station and the MRT subway at Phetchaburi Station. But be aware of where your hotel/destination is at the end of your ride in from Suvarnabhumi. You may still have a long taxi ride ahead of you and have to hustle your bags to the curb again. For points in the east side of Bangkok or places easily reached by expressway, it may just be easier to stick with an airport taxi. Coming in as far as On Nut Station on the BTS line has never cost me more than 220 baht or so and takes 20 minutes (barring traffic!).