According to accounts filed at Companies House, the company's turnover also reduced, from £293m in 2013 to £286m in 2014.
Kuoni Travel, which exited the tour operating industry to focus on being a service provider to the global travel industry earlier this year, blamed political instability in Thailand and Africa for the fall in revenue.
In the director's report, Derek Jones, managing director of Kuoni UK Group at REWE, said reduced amortisation and impaired goodwill has contributed to the loss.
"Our 2014 results pre-date the acquisition of Kuoni UK Group by REWE Group, and we are looking forward to taking the business forward under new ownership," he added.
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