However, a smaller Q400 aircraft, also a SpiceJet flight, was also on the tarmac.
A driver was reportedly misinformed and stopped on the apron for "close to 30 minutes" before taking the last of the passengers to the second SpiceJet plane, flight SG 3266, which was bound for Chennai.
The mistake was only discovered after the passengers showed their boarding passes to the crew on a second plane, according to the Times of India.
By then, the Mumbai flight was already near the run way and ready for take-off.
Ground staff were able to communicate the mistake in time and the pilot on flight SG 154 had to abort the take-off and return to pick up the remaining passengers according to the report.
One of the passengers, Karthik Ramani, told the Times of India: "It's strange that they didn't realise that one-fourth of the aircraft was empty, though the flight was fully booked."
The plane eventually took off at 10pm with just over three hours delay.
MailOnline Travel has contacted SpiceJet for comment.