Koenigsegg Agera Beats the Bugatti Veyron to Become the World's Fastest Car The supercar hit a top speed of 284.5 m.p.h. Brett Berk When the world’s only supersonic passenger plane, the Concorde, would jet down the runway for its transatlantic flights, it would reach terrestrial speeds of 225 m.p.h. before launching into the air. The Koenigsegg Agera RS, the latest seven-figure supercar from the boutique Swedish manufacturer, just ran at an average speed of 277.9 m.p.h. on a closed portion of Nevada highway. During one of the two runs, it hit 284 m.p.h. This not only crushes the record of world’s fastest airliner, but also that of the world’s fastest car, the $2.7 million Bugatti Chiron, which recently hit “only” 267.8 m.p.h., albeit not with its engine’s full power engaged—that will come next year. Still, for those looking at m.p.h.-per-dollar figures, the Koenigsegg is a relative bargain. It costs only $2.1 million.