IndiGo cancelled 67 flights on Thursday and several more on Friday due to forecasted bad weather, primarily dense fog, and some operational reasons. Disruptions affected multiple airports, including Varanasi, Chandigarh, and Guwahati, impacting routes across India. The airline is operating under DGCA monitoring and a curtailed schedule during the official winter fog window, which runs until February 10. Passengers are advised to check flight status before traveling.