RIYADH (AFP) - Saudi Arabian Airlines says a system failure has resulted in the disruption of flights as the kingdom prepares to host the annual haj pilgrimage.

"Saudi Arabian Airlines (Saudia) informs its valued guests about flight delays across the network due to an unforeseen system issue," the state-owned carrier said late on Tuesday (Aug 14).

"As a result, there are delays on some Saudia flights... The airline is taking all necessary measures to resolve the matter as quickly as possible."

The haj, which is expected to draw more than two million pilgrims this year, represents a key rite of passage for Muslims and a massive logistical challenge for Saudi authorities.

So far, more than one million pilgrims have arrived in the kingdom, according to state media.

The haj is set to take place from Aug 19 to Aug 24.