Circle Officer, Sikandara police station, DSP Rajaram Yadav said the bus first collided with tractor, then jumped the divider and rammed into a truck on the roadside this morning at about six km away from Sikandara.
The Lucknow-bound luxary bus was coming from Delhi.
Two women in their fifties and a 50-year-old man died on the spot, Yadav said, adding they are yet to identified and with the help of their mobile phones their family members have been informed in Delhi.