Reece Scobie, 19, booked business class flights to destinations around the world, including Singapore and Los Angeles during a six month spree.
The teenager, who has Asperger's Syndrome, also went on round-the-world trips taking in Dubai, Auckland, New York and Vancouver, and lavished tens of thousands of pounds on luxury hotel stays around Britain, under the nose of his unsuspecting boss.
Scobie even managed to dupe court staff into handing him back his passport which had been confiscated as a condition of bail while being investigated.
The teenager worked for Thomson Travel in Perth for only two months but continued to use the company's passwords to book flights and hotels after leaving his job.
Scobie discovered he could still gain access to the travel firm's online booking systems and he began to book a series of hotel rooms around the UK.
He spent more than a dozen nights at upmarket hotels including the Hilton chain and the Sofitel at Heathrow on at least five occasions.
Rooms were booked using both his own name and a series of aliases but normally he used his own name to check in. On one occasion, he treated two of his friends to a night in the Sofitel.
While Scobie was in Los Angeles irregularities came to light and his return flight was cancelled, forcing him to borrow cash to get back.
Scobie, of Rait, Perthshire, admitted two charges of fraud while at Thomson. He also admitted that between July 2011 and January 2012 he booked flights and hotel rooms on the company's account using passwords.
He also admitted accessing the accounts of Cambridge Business Travel, costing them £59,878 by booking numerous flights in January last year. Sentencing, at Perth Sheriff Court, was deferred for reports.