A passenger on IndiGo's Patna-Delhi flight on Thursday claimed that there was a bomb on board, which later turned out to be a hoax, sources said.
The flight, which was scheduled to depart at 8.20 pm, had to be grounded following the hoax threat, they said.
All the passengers were safely evacuated.
The plane was searched and nothing was found, a source said.
The passenger who spread the hoax was detained by the local authorities.
The plane is expected to leave for Delhi with passengers on Friday morning, sources said.
IndiGo did not respond to PTI's request for a statement on the matter.