IndiGo has been cancelling large numbers of flights in India mainly because its crew schedules and staffing failed to keep up with new, stricter pilot rest rules, which then snowballed into a nationwide operational meltdown. The airline also cites a mix of minor tech glitches, bad weather, congestion, and winter schedule changes, but regulators and pilot unions say poor planning and a long‑running “lean manpower” strategy are what turned these pressures into a crisis.

What’s going on?

  • IndiGo cancelled hundreds of flights per day in early December 2025, with some days seeing more than half its planned departures scrubbed and entire departures from Delhi halted temporarily.
  • Passengers have been stranded at major airports like Delhi, Mumbai, Bengaluru, and Hyderabad, with long queues, delays, and last‑minute cancellations becoming common.

The official reasons IndiGo gives

IndiGo’s CEO has described the issue as an “accumulation of several operational challenges.”

Key factors the airline itself points to:

  • New FDTL rules : India tightened Flight Duty Time Limitation norms for pilots, increasing mandatory rest and restricting night operations, which sharply cut available crew hours once the rules fully kicked in around November.
  • Tech and system issues : A software advisory affecting Airbus A320-family jets and other minor tech glitches caused delays that pushed flights past allowable duty limits, forcing cancellations when crews “timed out.”
  • Weather and congestion : Winter weather, airspace/airport restrictions, and high congestion added further delays, making the schedule even more fragile.
  • Schedule changes : A dense winter schedule with high frequencies meant even a 10% disruption translated to hundreds of flights being affected.

What regulators and pilot unions say

Aviation regulators and pilot bodies broadly agree that the new FDTL rules were the trigger, but argue that IndiGo’s internal choices are why it was hit so hard while rivals coped. Criticisms include:

  • Lean staffing strategy : Unions say IndiGo ran with very tight pilot numbers for years, relying on high utilization instead of building buffer capacity.
  • Delayed hiring and cost focus : Pilot bodies allege hiring freezes, pay freezes, and non‑poaching pacts left too little slack once rest rules tightened.
  • Poor planning for known rules : The new rest norms were announced well in advance, and other airlines reportedly adjusted schedules and rosters earlier, avoiding similar chaos.
  • Regulator’s view : India’s aviation authority has indicated that planning errors and miscalculations in applying the second phase of the FDTL rules caused a serious crew shortfall at IndiGo, and it has sought explanations and set up inquiries.

How bad is the disruption?

  • In November 2025 alone, IndiGo reported over 1,200 flight cancellations, with around 60% directly linked to FDTL and crew issues.
  • On some December days, over 300–1,000 flights were cancelled, including all IndiGo departures from Delhi for stretches of time, while hundreds more were delayed.
  • At single airports in one day, cancellations have run into the dozens or more than a hundred flights, affecting both arrivals and departures.

Because IndiGo is India’s largest carrier, operating well over 2,000 flights a day, even a relatively small percentage of cancellations translates into a huge number of disrupted journeys.

What IndiGo is doing now

  • The airline is trimming its schedule with “calibrated adjustments” to stabilize operations over several days, including pre‑emptive cancellations rather than last‑minute scrubs.
  • It has requested temporary relaxations or exemptions around some FDTL provisions from regulators, warning that without relief, instability could last into early 2026.
  • IndiGo says it is contacting affected passengers, offering rebooking and limited support while working to restore on‑time performance.

Bottom line: IndiGo is cancelling flights because new pilot rest rules collided with aggressive scheduling and thin staffing, and that mix—plus weather and tech issues—pushed the airline into a large‑scale operational breakdown.

Information gathered from public forums or data available on the internet and portrayed here.