The ceasefire, aimed at ending the chaos and bloodshed that has gripped Yemen since March 2015, came into effect on Saturday following the intervention of US Secretary of State John Kerry.
But despite a lull in air strikes on the rebel-held capital, both parties traded accusations over hundreds of violations.
The Saudi-led coalition said the truce ended at midday (0900 GMT) Monday, and accused Iran-backed insurgents of repeatedly breaking it.
"There is no respect (for the truce), only violations," coalition spokesman Major General Ahmed Assiri told AFP.
"At the military level, for the moment, we have no orders to extend the ceasefire. It's over."
The coalition had said the truce could be renewed if the rebels abided by the deal and allowed aid deliveries to besieged cities.
But both sides have accused each other of incessantly breaking the conditions of the deal, and violence flared as its expiration loomed.
Fifteen rebels and nine loyalist troops were killed in clashes overnight in and around Taez, military and medical sources said.
Early Monday, forces loyal to Hadi attacked Shiite Huthi rebels and their allies on the western outskirts of Taez, according to military officials.
The offensive targeted an air defence base, the officials said, while witnesses reported loud explosions.
Four of the Huthi casualties were killed in an air strike by the Saudi-led coalition.
Coalition warplanes hit rebel positions in Nahm, north of rebel-held capital Sanaa, and in the Huthi's heartland in Saada province, witnesses said.
And warplanes also conducted numerous sorties over Sanaa early today.
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