The tourists have already paid a significant deposit to go on the flight, which would use the Dragon 2 spaceship under development for NASA astronauts and the Falcon Heavy rocket due to launch its first test flight, the company said.
The launch of the first privately-funded tourist flight beyond the International Space Station is tentatively targeted for late 2018, said chief executive Elon Musk.
He declined to identify the customers or say how much they would pay to fly on the week-long mission, except to say that it was "nobody from Hollywood".
