Now is the best time to book a summer trip

  • Much of Europe is on sale now, with airfares down nearly 50 percent from their June and July highs.
  • These are the international destinations from the U.S. with the biggest round-trip price drops in late summer.

Sadly, summer is racing to an end. But it's not too late to get away.

For procrastinators, August is the best time to score a travel deal this summer, according to airfare prediction app Hopper.

Much of Europe is on sale in the late summer, Hopper found, with airfares down nearly 50 percent from their June and July peaks.

Old World hotspots such as Amsterdam, Helsinki and Stockholm are the international destinations with the biggest discounts, Hopper said.

For would-be travelers, this could be the perfect excuse to take a last-minute trip, said Hopper's travel expert Liana Corwin. "It's important to take time away from our desks and get outside."

American workers use only 54 percent of their eligible vacation time on average, according to a separate report by jobs and recruitment website Glassdoor.

Last year, only 23 percent of employees who get paid time off took all of the time they were entitled to — and nearly 10 percent took no paid time off at all, according to Glassdoor.

More from Personal Finance:
Three tips to make sure your summer getaway won't bust your budget
How to save on your summer rental car
Unused vacation costs workers $66 billion in lost benefits