Bangkok BKK: 4 Hours, 30 Min to the City
Yaowarat in 4 hours: Chinatown on foot, roast duck at 9pm, direct MRT back. BKK is worth leaving the terminal.
Getting from the airport
BKK to city center: 30 minutes by rail (Airport Rail Link). Fare is $2. Trains run every 12 minutes. Service runs 06:00 to 00:00. Skip the taxi unless your connection is under 5 hours.
What to do in Bangkok
The stops worth making: Grand Palace, Wat Pho, Chatuchak Market, Khao San Road. Rated above 4.4: Chinatown Bangkok (Yaowarat) (4.5), The Grand Palace (4.6), Sanam Luang (4.6), The Temple of the Emerald Buddha (4.7), Sampheng Market (4.4). You do not need the full tourist circuit. Pick two and commit.
Visa and entry
Bangkok is visa-free for US passports. No application, no fee. The border process at BKK is standard — budget 30 minutes.
How long do you need
The minimum useful layover is 4 hours. That gives you 30 minutes in each direction plus about 90 minutes on the ground. Up to 72 hours is a proper overnight.
BKK airport
BKK has 10 lounges. For short connections under 4 hours, the terminal is the destination — food options, showers, and enough space to reset before the next leg.