Visitors can travel by bus to Bangkok from Thailand’s neighboring countries with varying levels of ease.
From Malaysia, one can cross by bus into Thailand through various border checkpoints in Songkhla, Yala, and Narathiwat provinces, although most busses will head to the hub of bus travel into, out of, and around southern Thailand, Hat Yai. From Hat Yai there are direct busses to Bangkok.
Most busses from Laos originate in Vientiane and cross the Mekong River to the Thai border town of Nong Khai, where it is possible to arrange for a bus transfer to Bangkok.
The primary route on a Cambodian bus to Thailand is across the border at the respective towns of Poipet and Aranyaprathet. From Aranyaprathet one can easily arrange bus or minibus transport to Bangkok.