The mishap took place when a car lost control and collided with a divider on Purania railway overbridge here.
Of the seven traveling in the car, four died in a hospital's trauma centre while three others are critically injured.
According to reports, the family of Lucknow's Keshav Nagar was returning from Sitapur road after celebrating a birthday party there.
Meanwhile, in a separate accident, four people died, while five were injured after a car overturned in Kannauj city of the state. (ANI)