Thai Smile Bus (Thai: บริษัทไทยสมายล์บัสจำกัด) is a major private bus operator in Bangkok and its 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. Fares start from 10 baht, with the entire fleet consisting 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.

The company also operates electric ferries along the Chao Phraya River and Khlong Saen Saeb in Bangkok branded as Thai Smile Boat.

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).

Thai Smile Bus received a concession from the Department of Transport to operate 71 bus routes, with an additional 52 routes announced in 2023. Thai Smile Bus also announced it would 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.

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.

Now service is available on 125 routes Route 1-1 (29): Bang Khen <> Hua Lamphong via Vibhavadi Rangsit Road and Rama VI Road Route 1-2E (34E): Rangsit <> Hua Lamphong via Ram Intra Road with Chalong Rat Expressway Route 1-3 (34): Bang Khen <> Hua Lamphong via Phahonyothin Road Route 1-4 (39): Bang Khen <> Thammasat University Rangsit Campuses Route 1-5 (39): Rangsit <> Victory Monument via Phahonyothin Road Route 1-6 (39): Pakkred Pier <> Mo Chit 2 Bus Terminal via Vibhavadi Rangsit Road Route 1-9E: Thammasat University Rangsit Campuses <> Thammasat University Thaprachan Campuses via Udon Ratthaya Expressway and Si Rat Expressway Route 1-13 (126): Chaeng Watthana Government Complex <> Khlong Tan Route 1-15 (150): Pakkred Pier <> Min Buri Route 1-17 (187): Rangsit 3th Khlong <> Victory Monument via Vibhavadi Rangsit Road Route 1-18E (504): Rangsit <> Bang Rak via Don Mueang Tollway Route 1-23 (524): Lak Si Station <> New Southern Bus Terminal Route 1-24E (538): Rajamangala University of Technology Thanyaburi <> Priest Hospital (Bangkok) via Don Mueang Tollway Route 1-31: Chaeng Watthana Government Complex <> 5th Khlong Luang Route 1-32E: Bang Khen <> Talat Phlu BTS station with Chalong Rat Expressway and Si Rat Expressway Route 1-33: Bang Khen <> Bang Sue Station Route 1-37 (27): Min Buri <> Victory Monument Route 1-39 (71): Suan Siam <> Khlong Toei Route 1-41 (92): Happy Land <> Kheha Romklao Route 1-44 (113): Min Buri <> Hua Lamphong Route 1-45 (115): Suan Siam <> Bang Rak Route 1-47 (143): Namkrai Industrial Estate <> Min Buri Route 1-49 (152): King Mongkut's Institute of Technology Ladkrabang <> Happy Land Route 1-49 (152): Min Buri <> Hathairaj Road With Running in a circle route. Route 1-56 (517): King Mongkut's Institute of Technology Ladkrabang <> Victory Monument Route 1-58 (525): Suan Siam <> 12th Khlong Lamlukka Route 1-59 (526): Suan Siam <> Euea-A-Thorn Sangkhasantisuk Village Route 1-61: Euea-A-Thorn Sangkhasantisuk Village <> Min Buri Route 1-62: Min Buri <> Ministry of Commerce Route 1-63 (888): Pattavikorn Market <> Rama VIII Bridge Route 1-71: Min Buri <> Ladkrabang Industrial Estate With Running in a circle route. Route 1-76: Buakhao Village <> Min Buri With Running in a circle route. Route 1-77: Min Buri <> Ekkamai Bus Terminal Route 2-3 (18): Tha It Market <> Victory Monument Route 2-4 (30): Wat Paknam (Nonthaburi) <> Old Southern Bus Terminal (Pinklao) Route 2-8 (51): Wat Prang Luang <> Bang Khen Route 2-11 (64): Ministry of Public Health <> Sanam Luang Route 2-13 (69): Tha It Market <> Ramkhamhaeng University Route 2-15 (97): Ministry of Public Health <> Priest Hospital (Bangkok) Route 2-16 (104): Pakkred Pier <> Mo Chit 2 Bus Terminal via Phahonyothin Road Route 2-17: Bang Sue Station <> Kasetsart University With Running in a circle route. Route 2-18E (69E): Tha It Market <> Ramkhamhaeng University with Si Rat Expressway Route 2-19 (127): Bang Bua Thong Market <> Bang Lam Phu (Wat Bowonniwet Vihara) Route 2-22 (175): Nonthaburi Pier <> Thanon Tok Route 2-26 (545): Nonthaburi Pier <> Phatthanakan Route 2-27 (210): Muang Thong Thani <> Bang Wa Station It's Route Support for FULL SENSE PUBG Route 2-34: Sam Sen railway station <> Din Daeng With Running in a circle route. Route 2-35 (110): 3th Prachaniwet <> The Wet Route 2-38 (8): Happyland <> Phutthayotfa Bridge Pier Route 2-42 (44): Kheha Khlong Chan <> Tha Tien Route 2-48 (122): Happyland <> Mo Chit 2 Bus Terminal Route 3-1 (2): Pak Nam <> Phutthayotfa Bridge Pier Route 3-2E (2E): Pu Chao Saming Phrai <> Phutthayotfa Bridge Pier with Chaloem Maha Nakhon Expressway Route 3-3 (11): Suan Luang Rama IX <> National Stadium Route 3-6 (25): Pathumkongka School Samut Prakan <> Ekkamai Bus Terminal Route 3-8 (38): Ramkhamhaeng University Bang Na Campuses <> Victory Monument Route 3-11 (48): Ramkhamhaeng University Bang Na Campuses <> Tha Chang Pier Route 3-13 (507): Samrong <> New Southern Bus Terminal Route 3-14 (132): Kheha Bang Phli <> Udom Suk BTS station Route 3-15 (133): Kheha Bang Phli <> Ekkamai BTS station Route 3-23E (513): Samrong <> Chaeng Watthana Government Complex with Chalong Rat Expressway Route 3-25E (552): Pak Nam <> Ladkrabang Industrial Estate with Burapha Withi Expressway Route 3-26E: Chakri Naruebodindra Medical Institute <> Ramathibodi Hospital with Si Rat Expressway Route 3-27: Pu Chao Saming Phrai <> Suan Siam via Srinagarindra Road Route 3-32: Samrong <> Suan Siam Route 3-34: Bang Na <> Ladkrabang Industrial Estate Route 3-35 (1): Central Rama III <> Tha Tien Route 3-36 (4): Khlong Toei Pier <> Phasi Charoen Pier Route 3-37 (12): Thailand Cultural Centre <> Sanam Chai MRT station Route 3-39 (14): Thanon Tok <> Si Yan Route 3-44: Khlong Toei Pier <> Victory Monument Route 3-45 (77): Central Rama III <> Mo Chit 2 Bus Terminal Route 3-52: Central Rama III <> Hua Lamphong With Running in a circle route. Route 3-53: Hua Mak station <> Sao Chingcha Route 3-54: Phasi Charoen Pier <> Victory Monument Route 3-55: Khlong Toei Pier <> Rama VII Bridge Route 34: Rangsit <> Hua Lamphong Route 39: Talaad Thai Market <> Victory Monument Route 4-1 (6): Phra Pradaeng Pier <> Bang Lam Phu (Wat Bowonniwet Vihara) via Charoen Nakhon Road Route 4-3 (17): Big C Phra Pradaeng (Big C Suksawat) <> Victory Monument Route 4-8 (35): Kheha Thonburi <> Bang Lam Phu (Wat Bowonniwet Vihara) Route 4-10 (42): Sao Chingcha <> Tha Phra With Running in a circle route. Route 4-13 (75): Phutthabucha <> Hua Lamphong Route 4-15 (82): Phra Pradaeng Pier <> Banglamphu via Suk Sawat Road Route 4-16 (85): Phra Pradaeng <> Thon Buri railway station Route 4-17 (88): KMUTT Bang Khun Thien Campuses <> Talat Phlu BTS station Route 4-21 (120): Samut Sakhon <> Yaek Bang Khae Route 4-23E (140): Samae Dam <> Victory Monument with Chaloem Maha Nakhon Expressway Route 4-25 (147): Kheha Thonburi <> Bang Wa Station With Running in a circle route. Route 4-26 (167): Kheha Thonburi <> Lumphini MRT station Route 4-27E (173): Bang Khun Thian <> Happyland with Chaloem Maha Nakhon Expressway and Chalong Rat Expressway Route 4-28 (529): Samae Dam <> Victory Monument Route 4-29E (529E): Samae Dam <> Mo Chit 2 Bus Terminal with Chaloem Maha Nakhon Expressway Route 4-34: Samae Dam <> Phra Pradaeng With Running in a circle route. Route 4-36 (7): Suksanaree School <> Hua Lamphong Route 4-37 (9): Kanlapaphruek Road <> Sam Sen railway station Route 4-38 (28): New Southern Bus Terminal <> Chandrakasem Rajabhat University Route 4-39 (40): New Southern Bus Terminal <> Ekkamai Bus Terminal Route 4-40 (56): Krung Thon Bridge <> Bang Lam Phu (Wat Bowonniwet Vihara) With Running in a circle route. Route 4-41 (57): Taling Chan <> Iconsiam With Running in a circle route. Route 4-44 (80A): Wapawor 11 Village <> Suan Luang Rama VIII Route 4-45 (81): 5th Phutthamonthon (Sai 5) <> Tha Tien Route 4-46 (84): Wat Rai Khing <> BTS Krung Thon Buri Route 4-47 (89): New Southern Bus Terminal <> Rajamangala University of Technology Krungthep Route 4-49 (170): Save E Market (Borommaratchachonnani) <> Mo Chit 2 Bus Terminal Route 4-50 (123): Om Yai (Nakhon Pathom) <> Sanam Luang Route 4-51 (124): Salaya <> Sanam Luang Route 4-52 (146): New Southern Bus Terminal <> Tha Phra With Running in a circle route. Route 4-53 (149): Save E Market (Borommaratchachonnani) <> Ekkamai Bus Terminal Route 4-54E (157): Om Yai (Nakhon Pathom) <> Victory Monument with Prachim Ratthaya Expressway Route 4-55 (163): Salaya <> National Stadium Route 4-56 (165): Salathammasop (Borommaratchachonnani) <> BTS Krung Thon Buri Route 4-61 (515): Central Salaya <> Victory Monument Route 4-67: Salaya railway station <> Ministry of Commerce Route 4-68: Suan Phak <> Thanon Tok Route S2 (554): Rangsit <> Suvannabhumi International Airport via Ram Intra Road Route S3 (559): Rangsit <> Suvannabhumi International Airport via Rangsit-Nakhon Nayok Road and Pass Suan Siam Route S4 (549): Min Buri <> Suvannabhumi International Airport Route S5 (550): Happyland <> Suvannabhumi International Airport Route S6 (555): Mo Chit 2 Bus Terminal <> Suvannabhumi International Airport Route S6A (555A): Don Mueang International Airport <> Suvannabhumi International Airport Route S7 (558): Kheha Thonburi <> Suvannabhumi International Airport

Overnight service is available on 13 routes 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 <> Phutthayotfa Bridge Pier Route 3-1 (2): Pak Nam <> Phutthayotfa 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

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