PC Richard Musgrave, 52, was dismissed from Cambridgeshire Police without notice after allegedly going missing from March police station to give a woman and her friends a lift, before driving to an industrial estate to eat a kebab.
The incident on 31 July 2016 sparked an emergency search by officers who were concerned for his welfare.
The four-day hearing in Peterborough concluded he had breached professional standards in respect to honesty and integrity, discreditable conduct and duties and responsibilities.
PC Musgrave said he had been on the industrial estate for burglary control but was unable to be contacted as his mobile phone was on silent, his watch stopped and his ear piece had come out of his radio.
He allegedly later "dishonestly told the sergeant that he had gone to the industrial estate to finish writing a statement and had fallen asleep there".
PC Musgrave was further accused of driving a marked vehicle to meet a woman at a Wetherspoons pub while on duty.
Some of the group the woman was drinking with were alleged to have behaved in a drunken or abusive manner and were refused service by the pub.
He was allegedly aware of the group's behaviour but did not take the correct steps to address the situation and was said to have supplied a witness statement containing false information.