The United Arab Emirates (UAE), Saudi Arabia, Egypt, Bahrain, Libya and Yemen have all severed ties with Qatar following allegations that the country backs certain Islamist terrorist groups. ... As a result of this event, a number of airlines have indefinitely suspended flights to Doha, the capital of Qatar.

Why did Qatar cancel flights to Pakistan?

Doha: Pakistan airspace has been closed due to an escalation in India-Pakistan tensions until further notice. This has resulted in Qatar Airways flights to Peshawar, Faisalabad, Islamabad, Karachi, Lahore, Multan and Sialkot being cancelled until further notice, travel alert put out on the airline's website said.

Why flights are Cancelled?

Delays could happen in various ways: increased number of people during the holidays causing security lines to go too long. security concerns prior to your flight causes the plane to stay grounded. security concerns mid-flight causing the same plane you're supposed to take on your return flight to stay grounded, etc.