This is the only sensible way to the airport if you stay along the BTS skytrain line. You get on the airport rail link from one of the BTS stations - Phayathai. At this moment, the non-stop express train to the airport has been terminated and only the city link, which makes several stops and carries largely city commuters, is available. It is crowded and uncomfortable as it has just long steel benches for seats. But it is cheap - at just 45 baht (US$1.50, but expensive for daily office workers). The journey takes half-an-hour point to point. At the station (Phayathai), there are only escalators going up but not down. So if you arrive from the airport, you'd have to take the stairs down dragging your luggage. There are no facilities for travelers as it seems to be built for commuters.