Three SpiceJet flights from Delhi to Pune, Leh and Mumbai were cancelled on Friday morning amid a technical disruption affecting Microsoft services worldwide.
Two other SpiceJet flights from Delhi to Darbhanga and Mumbai were delayed.
IndiGo, Akasa Air and the Delhi airport authorities advised passengers to check the latest status and schedule of their flights before travelling.
Air India said it was monitoring the situation, but its flight operations and communication systems had not been affected so far.
Technical problems were reported in Microsoft services, including Outlook and Teams, since Thursday. Users faced difficulties in accessing email and other applications.
Microsoft said it was aware of problems with Exchange Online and email services and was working to identify the cause and restore normal services.
