Egencia polled 9,000 people, with 20 percent admitting that they didn't book a leisure portion to their business trip as they were concerned what their boss would think.
The figure was much higher for employees in Asia, up to 32 percent, with North America following behind at 20 percent and Europe even less at 15 percent.
And when people are deciding whether or not to extend their stay, it comes down to the destination of the business trip, with 30 percent of North America travellers making the location the most important. Proximity to the weekend also ranked highly at 23 percent.
Wendy White, vice president of marketing at Egencia, said: "The insight that many business travellers have skipped bleisure trips due to employer perception reveals an opportunity for differentiation in the race for top talent. With more companies today prioritizing work-life balance, it may be time to start including bleisure in your travel program to invest in employees and encourage them to make every trip count."
Meanwhile, a previous study revealed young people are more likely to go for a job that lets them travel.
The study by CV-Library found that 64.6 percent of millennials wouldn't mind having to travel for their job, but that dramatically reduces for professionals between 45 and 54-years-old, with 38.4 percent not minding the idea of travelling for work. For 55 to 64-year-old employees, it falls even more to 33.7 percent.
Lee Biggins, founder and managing director of CV-Library, said: "Many of us have experienced how exhausting travelling can be, whether that's from jet lag, long journeys or getting little sleep. So it's understandable that UK workers are worried about the effects of travel on their health. The research shows that because of this, many professionals don't want to combine work and travel."