Suvarnabhumi
to the city
Rail between 06:00 and 22:00 with light bags; a car late at night, in rain, or with luggage. The Airport Rail Link is ฿15–45 and interchanges with the BTS at Phaya Thai. An official taxi from the Level 1 kiosk works out around ฿300–450 with the airport surcharge and tolls, and Bolt is usually the cheapest car at ~฿320–380. First, check which airport you are actually landing at — Bangkok has two, 45 km apart.
Suvarnabhumi to downtown, compared
Bangkok has two airports, 45 km apart
Bangkok has two airports 45 km apart, and mixing them up is the most expensive mistake on this page. BKK (Suvarnabhumi) handles most international carriers; DMK (Don Mueang) is the AirAsia/Lion/Nok budget hub. Check the airport code on every ticket — especially self-transfer connections, where a cross-town dash through traffic can eat 90 minutes.