Four of those hurt suffered injuries police called life-threatening and they remained in critical condition Thursday.
The crash happened at about 9:30 p.m. Wednesday on the Thruway south of Exit 21B in the town of Athens, Greene County, police said.
It happened as the driver, identified as Percival Carter, 73, of Jamaica, attempted to avoid an uninvolved vehicle that changed lanes, but over-corrected causing the van to lose control and overturn numerous times, police said. Carter was not injured in the crash. No charges are pending and no tickets were issued, police said.
Police identified the four seriously injured passengers as Diane A. Grier, 51, of Queens Village, Phyllis May Lewis, 65, of Rosedale, Richard K. Senior, 56, of Queens Village, and Pamela Wilson, 65, unknown residence.
Nine others suffered lesser injuries, police said.
The group was from the Church of God of Prophecy, in South Ozone Park, police said. They had been en route back to New York City from visiting Niagara Falls, police said.
State police were assisted by its Bureau of Criminal Investigation, its Collision Reconstruction Unit, Coxsackie and New Baltimore fire departments and multiple EMS agencies, police said.