“This drop was more than a seasonal swing,” she said. “It was most notable in the days right after the ban was enacted.”

In addition, the Swedish travel search engine Flygresor.se analyzed 2.5 million flight searches made on its website and app the weekend following the announcement of the travel ban and found that searches to the United States declined by 47 percent, compared with the same period the year before.

Flight bookings to the United States also declined following the ban, according to ForwardKeys, a travel research company in Valencia, Spain. The company looked at 16 million flight reservations a day between Jan. 28 and Feb. 4 and found that international bookings to the United States were down 6.5 percent, compared with the same period last year.

Some travel companies, too, saw a dip in requests and bookings for trips to the United States.

Responsible Travel, a tour operator in Brighton, England, had a 22 percent decrease in trip inquiries to the United States following the travel ban. In contrast, the company’s overall business is up 30 percent this year, compared with the same period last year, said its chief executive, Justin Francis.

“Prior to the ban, the U.S. was one of our best-selling destinations, but our customers are now choosing to travel to other countries,” he said.