IndiGo Warns of Kolkata Flight Disruptions Amid Severe Weather Forecast

Indian carrier IndiGo has issued a travel advisory for passengers traveling to or from Kolkata's Netaji Subhash Chandra Bose International Airport (CCU), warning of potential flight disruptions due to expected thundershowers. The advisory, communicated on May 2, highlights the operational challenges posed by severe pre-monsoon weather systems in the region.

The airline stated that both arrivals and departures could be impacted and advised passengers to check their flight status before heading to the airport. In a post on the social media platform X, IndiGo noted, "While our teams are preparing well in advance to keep things running smoothly, the weather may slow things down a touch." This proactive communication aligns with an industry trend of using social media to manage passenger expectations and mitigate airport congestion during weather-related disruptions.

Passengers were also advised to account for extra travel time to the airport, as heavy rainfall could affect road traffic throughout the city. The advisory affects travelers at a key eastern India hub and underscores the growing impact of extreme weather on airline scheduling.

National Weather Outlook

The advisory coincides with a broader forecast from the India Meteorological Department (IMD), which predicts wetter-than-usual conditions for May. According to the IMD's May 2026 outlook, rainfall across India is projected to be above normal, exceeding 110% of the Long Period Average (LPA). The LPA, a baseline calculated from 1971–2020 data, is 64.1 mm for the month of May.

This forecast is influenced by significant global climate drivers. The IMD noted that neutral conditions in the Pacific are transitioning towards El Niño, a pattern expected to develop during the subsequent southwest monsoon season. Concurrently, a positive Indian Ocean Dipole (IOD)—a climate driver defined by sea surface temperature differences—is likely to emerge late in the monsoon season. The combined effect of these phenomena is expected to heavily influence rainfall distribution and temperature patterns across the subcontinent.

While most of the country is expected to receive normal to above-normal precipitation, the IMD has indicated that parts of east, northeast, and east-central India might see below-normal rainfall.

Operational and Regulatory Context

Airlines operating in India must follow strict protocols during such events, as mandated by the Directorate General of Civil Aviation (DGCA). The DGCA's Adverse Weather Operations Guidelines dictate requirements for additional fuel carriage, planning for alternate airports, and managing crew duty limits to ensure safety during severe weather. For Kolkata-bound flights, alternate airports could include Bhubaneswar (BBI) or Ranchi (IXR).

The increasing frequency of extreme weather events is compelling Indian carriers to build more resilience into their schedules, particularly during the summer and monsoon seasons. This involves incorporating greater buffer times to accommodate potential delays without causing cascading network-wide disruptions. The stakeholder impact is significant, particularly for Kolkata Airport ground operations, which face increased runway congestion, holding patterns, and potential suspension of services during lightning strikes. For connecting passengers at CCU, the risk of missed connections and extended travel times is high.

Historical Precedents and Industry Impact

Kolkata's aviation infrastructure has proven vulnerable to severe weather in the past. In May 2020, Cyclone Amphan caused a temporary shutdown of the airport, widespread flooding, and significant flight cancellations, highlighting the airport's susceptibility to pre-monsoon and monsoon weather. More recently, the canopy collapse at Delhi Airport's Terminal 1 in June 2024 following severe rainfall demonstrated the broader infrastructural risks posed by sudden, above-normal precipitation at major Indian airports.

These events underscore a pattern of weather-related stress on the country's aviation system. The IMD's forecast suggests that while the increased rainfall may benefit the agricultural sector by improving soil moisture for the upcoming Kharif season, it could also disrupt the harvesting of late Rabi crops.

What Comes Next

IndiGo's advisory is a precursor to the wider operational adjustments expected as the monsoon season approaches. According to the IMD, the onset of the Southwest Monsoon over the Andaman and Nicobar Islands is expected between May 14-16, 2026. This will mark the beginning of a period requiring heightened operational vigilance from all Indian carriers.

The expected emergence of a positive Indian Ocean Dipole later in the season will be closely monitored, as it could further influence rainfall patterns and operational conditions. Airlines will continue to rely on real-time meteorological data to make tactical decisions regarding flight routing, diversions, and cancellations.

Why This Matters

This travel advisory, while specific to Kolkata, reflects a larger trend of climate-driven operational uncertainty in Indian aviation. For airlines, it necessitates more sophisticated weather forecasting integration and flexible scheduling to maintain network integrity. For passengers, it signals an increasing likelihood of weather-related travel disruptions becoming a regular feature of air travel in the region, especially during seasonal transitions.