This'll probably come as no surprise to anyone familiar with The Flash.
Barry talked about traveling around the world "at just over Mach 7". According to Wikipedia, at 20 degrees Celsius, the speed of sound is 767 MPH. At seven times that (5,369 MPH), they'd take about half an hour to cross the continental United States from east to west (or vice versa). They would emphatically NOT be circling the globe several times per second, as they were toward the end.