The conflict has caused almost 10,000 deaths, mostly civilians, and caused the worst humanitarian crisis in the world.
Geert Cappelaere said in an interview that recent USA calls for a cease-fire are imperative to ending the almost four-year war, which pits a Saudi-led coalition against Iran-aligned rebels known as Houthis.
United Nations Secretary General Antonio Guterres said Yemen is teetering "on a precipice", appealing to the worldwide community to put an end to the Saudi war on the impoverished nation, more than three-and-a-half years after the regime and a number of its allies invaded the peninsular country.
The united Nations Fund for children (Unicef) urged on Sunday the conflicting parties in Yemen to stop fighting, believing that the country had become a "hell on earth" for children, hit by starvation.
Addressing reporters at the world body's headquarters in NY on Friday, the secretary-general said the warring parties must seize on the "opportunity for peace" presented by UN-brokered talks scheduled to be held in Sweden later this month.
UN Secretary-General Antonio Guterres on Friday had called for a halt to violence to pull Yemen back from the "precipice".
Aviation at the airport and global aid efforts are unaffected, Colonel Turki al-Malki said in a phone interview that was broadcast live.
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The UN says about 14 million people, or half Yemen's population, could soon be on the brink of starvation in a man-made disaster.
Washington, a close Saudi ally, supports coalition forces by refuelling their jets and selling them weapons.
Yemeni children are dying from starvation and disease as trucks with life-saving supplies are blocked in port, leaving medical staff and desperate mothers imploring aid workers to do more, a senior United Nations official said.
Houthi Ansarullah fighters launched drone attacks against the King Khalid airbase in Saudi Arabia's Asir region last night in retaliation for Riyadh's bombing of a rebel airbase near Yemeni capital Sana'a airport a day ago.
The port is the entry point for more than 70% of imports into the impoverished country.
Both Tehran and the rebels deny the port is being used to smuggle arms from Iran into Yemen.
Other rights groups estimate the toll could be five times higher.