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Extreme temperatures are driving travelers to seek cooler destinations. And there's a term for the trend: "coolcations."

Heat waves — which are increasing in frequency, duration and intensity, according to the U.S. Environmental Protection Agency — are affecting where people are choosing to vacation, especially during the hot summer months.

"Often, when we think of vacation, beaches and tropical escapes come to mind," a spokesperson for Expedia told CNBC Travel. "Coolcations however, are all about opting for destinations where the temperatures are more moderate, where you're packing a light sweater instead of a sun hat."

From January to June 2024, flight searches increased 705% to Lapland, Finland, according to Expedia. The online travel agency said flight searches are also up to Canada, specifically Banff (65%) and Lake Louise (55%), its data showed.

The home rental website Vrbo reported that cooler places emerged among the top 40 most booked destinations this summer, a list which included Breckenridge, Colorado; White Mountains, New Hampshire; and Pocono Mountains, Pennsylvania.

Californian Stephanie Greitzer said she planned a family trip to Whistler this summer.

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