In an updated travel advisory issued on July 15, Singapore Airlines said the extension was due to the "geopolitical situation in the Middle East," The Straits Times reported.

In a separate statement released the same day, the airline said Scoot's cancellations were prompted by the renewed escalation of hostilities in the region, AsiaOne reported.

A Singapore Airlines plane lands at Hanoi's Noi Bai Airport. Photo by VnExpress/Giang Huy

"As the situation remains fluid, other SIA flights may be affected," the airline said.

Passengers impacted by the cancellations are eligible for a full refund of the unused portion of their tickets, according to both carriers.