India, Dec. 4 -- At least 250 IndiGo flights were cancelled on Thursday as chaos continued at major airports across India, with the carrier struggling to adapt to stringent new crew rostering rules. On Wednesday, the airline cancelled at least 150 flights and announced that it had initiated "calibrated adjustments" to its schedules for the next 48 hours.

The on-time performance (OTP) of IndiGo, India's largest airline, dropped to 19.7% on Wednesday from 35% a day earlier, according to civil aviation ministry data.

An official aware of the matter said 33 flights were cancelled from Delhi, 68 from Hyderabad, 85 from Mumbai, and 73 from Bengaluru on Thursday. On Wednesday, at least 67 flights were cancelled at Delhi airport (37 departures ...