# Thai Smile Bus

Thai Smile Bus (Thai: บริษัทไทยสมายล์บัสจำกัด) is a private bus operator in Bangkok and the surrounding provinces that provides bus service under a concession issued by the Thai Ministry of Transport.
Since it launched service in 2022, Thai Smile Bus has progressively taken over bus routes in the Bangkok Metropolitan Region from other providers, including the public operator, Bangkok Mass Transit Authority. TSB runs a fleet of EV buses, aimed at reducing carbon emissions. As of 2025, TSB runs 123 bus routes in Bangkok and the surrounding provinces as part of a plan to reform bus operations in and around Bangkok.
Thai Smile Bus also operates electric ferries along the Chao Phraya River and Khlong Saen Saeb in Bangkok.

## History

The company was registered on 9 June 2020 with Kulpornphat Wongmajarapinya as CEO and Chairwoman, who retains a 51% majority ownership stake. The remaining 49% of shares are held by Beyond Securities (BYD). The company does not appear to have any affiliation with Thai Smile Airways, despite the similar names.
According to the company website, Thai Smile Bus received a concession from the Department of Transport to operate 71 bus routes. In 2023, it announced that it would operate an additional 52 routes and expand its fleet of electric vehicles by 1,850 from 1,250 buses to a total of 3,100 buses.
As part of Bangkok Mass Transit Authority's bus reform plan to allow private operators to take over existing BMTA routes, TSB came to inherit a fleet of a fleet of approximately 350 diesel buses. By January 2024, however, the company decommissioned all of its NGV buses, running a fleet of 100% electric vehicles. Later that year, TSB began operating 24-hour services on 13 routes to meet growing demand for all-day service with 1 hour frequencies between 12:00 midnight and 5:00 am. This move was met with some public pushback due to the fact that the decommissioning of diesel buses included pulling non-air conditioned buses out of service. Non-air conditioned buses charged lower fares (starting from 8 THB) while TSB fares begin at 15 THB and were therefore more affordable to the public. In response, TSB began operating electric non air-conditioned buses or "hot buses" for a flat fare of 10 THB on some routes.
The company dispelled rumours that BTS Group Holdings, the operator for BTS Skytrain and Bangkok BRT, was acquiring TSB.
In addition to bus operations, TSB has been operating all-electric river and canal ferries under the '''Thai Smile Boat''' brand since 2023.

## Routes

As of 2025, TSB operates a total of 123 bus routes throughout the Bangkok Metropolitan Region. Most route numbers are identified using a Z-NN format, with the first number representing the zone to which the bus route belongs. The second number designates the actual route.
In the case where TSB inherited routes from BMTA, buses also display the old BMTA number in parentheses.
Notably, TSB has come to operate Route 8, a bus line notorious for a high incidence of reckless driving. Upon its transfer to TSB, it has been renumbered 2-38.
Overnight service is available on 13 routes, which are:
* Route 1-3 (34): Bang Khen <> Hua Lamphong via Phahonyothin Road
* Route 1-37 (27): Min Buri <> Victory Monument
* Route 1-39 (71): Suan Siam <> Khlong Toei
* Route 2-15 (97): Ministry of Public Health <> Somdej Phra Pinklao Hospital
* Route 2-38 (8): Happyland <> Phutthaphot Bridge Pier
* Route 3-1 (2): Pak Nam <> Phutthaphot Bridge Pier
* Route 3-6 (25): Pathumkongka School Samut Prakan <> Ekkamai Bus Terminal
* Route 3-36(4): Khlong Toei Pier <> Phasi Charoen Pier
* Route 34: Rangsit <> Hua Lamphong
* Route 4-36 (7): Suksanaree School <> Hua Lamphong
* Route 4-44 (80A): Wapawor 11 Village <> Suan Luang Rama VIII,
* Route 4-46 (84): Wat Rai Khing <> BTS Krung Thon Buri
* Route 4-15 (82): Phra Pradaeng Pier <> Banglamphu

## Fleet

TSB operates a fleet of over 3,100 electric buses. The company uses a dark blue livery for its buses. The fleet comprises mainly of 12-metre long buses, however TSB also operates 8-metre long buses.

## Fares

TSB fares vary between air-conditioned buses and non air-conditoned or "hot buses". "Hot buses" charge a flat fare of 10 THB while air conditioned buses are charged according to the distance travelled. Fares for both buses are payable by smart card.
Adult fares for air-conditioned buses :
| Short journeys (up to 4 km) | Intermediate journeys (4 km to 16 km) | Longer journeys (over 16 km) | Expressway surcharge | Daily cap (bus only) | Daily cap (with ferries) |
| 15 THB | 20 THB | 25 THB | 2 THB | 40 THB | 50 THB |
In conjunction with the Ministry of Transport, the company introduced the HOP Card in December 2022.HOP Card can also be used to pay fares for the company's electric ferries. The Ministry of Transport endeavours for the HOP Card to be used on all transport modes in the future.
Passengers must tap their HOP card upon boarding and alighting. The card may be purchased onboard buses or at Thai Smile Ferry terminals.
As of February 2025, Thai Smile Bus sets a fare cap of 40 THB daily for bus rides only. There is a fare cap of 50 THB for bus and ferry rides. Discount fares are available to children, who enjoy a daily fare cap of 25 THB.