Some flights from the National Capital, Mumbai and other places were cancelled.
Sources said some issues with the airline's crew optimiser software, used for rostering, resulted in disruptions of flight schedules and a few cancellations.
Besides, the disruptions were reported as pilots adhered strictly to the roster and refused to operate extra flights in view of the ongoing flight safety week, sources added.
There were no immediate comments from Jet Airways.
It could not be ascertained immediately the exact number of flights that were disrupted today.
Later in a statement, the airlines said the issue occurred as high number of pilots had reported sick.
"Jet Airways is pleased to announce that operations across its network have returned to normal, following the resolution of issues caused by the non-availability of an unusually high number of pilots who had reported sick.
"This had resulted in the disruption of certain flight schedules, causing inconvenience to the airlines' guests, the statement said.
"The airline remains committed to maintain the sanctity of its flight schedules," it added.
