Jet said Mumbai-Kolkata, Kolkata-Guwahati and Dehradun-Guwahati via Kolkata flights were cancelled for Friday due to "operational reasons."
"Similarly, 9W 676 from Dehradun to Kolkata via Guwahati has also been cancelled until further notice," Jet said in a statement.
Refunds are being processed, the airline added.
Separately, aviation secretary Pradeep Singh Kharola told PTI that the ministry may review Jet's eligibility to continue its international operations after it gets a report from the regulator DGCA
on the issue.