Ngoc Thuong Coach Company, which operates services between Ho Chi Minh City and Binh Dinh Province, increased fares on some trips from March 8 until fuel prices stabilise.
Ticket prices on the route rose from VND 300,000 (about USD 11.41) to VND 320,000.
The company said soaring diesel prices had pushed up operating costs, forcing fare adjustments to maintain services. It added that prices could be revised again if fuel costs continue to rise.
Co Hai Bus Company, serving routes from Ho Chi Minh City to the Central Highlands, also announced fare adjustments from March 8 but did not specify the increase.
Meanwhile, Phuong Hong Linh said ticket prices on the same route had risen by about 20 per cent.
Hai Luan Bus Company, which operates routes from Dak Lak to Ho Chi Minh City and Can Tho, said fares had increased by VND 50,000 per ticket due to higher fuel costs, adding that the adjustment was necessary to maintain service quality.
Several other operators serving routes from Ho Chi Minh City to other provinces have also announced fare increases following the recent surge in fuel prices.
However, representatives of several bus terminals in the city said they had not yet received official notifications from transport companies requesting fare adjustments.
Nguyen Minh Tien, deputy general director of Mien Tay Bus Station Joint Stock Company, said that two days after the fuel price adjustment, the terminal had not recorded any requests from transport firms to raise ticket prices.
He noted that transport companies can adjust fares by submitting price declarations to the Ho Chi Minh City Department of Construction for review, while bus stations are responsible for ensuring operators sell tickets at the registered prices.
A representative of Mien Dong Bus Station also said the terminal had not received any notifications of fare increases or requests for support from transport companies so far, although operators might move to adjust prices later this week.
Vietnam's fuel prices have risen in three consecutive adjustments following one decline. Since the beginning of the year, fuel prices have increased seven times and fallen four times.
Following the lastest adjustment by local regulators on March 7, E5 RON 92 petrol rose by VND 3,780 per litre to VND 25,220, while RON 95 petrol increased by VND 4,700 to VND 27,040 per litre.
Diesel jumped by VND 7,200 to VND 30,230 per litre, kerosene rose by VND 8,490 to VND 35,090 per litre, and fuel oil increased by VND 3,830 to VND 21,320 per kilogramme. Authorities did not draw from or contribute to the fuel price stabilisation fund.
