For its own scientific missions, Nasa has already agreed deals with Elon Musk's SpaceX, which will use its Dragon capsule, and Boeing, which is building a spacecraft called the Starliner.
It is likely these companies will charge a similar "taxi fare" for spacebound tourists.
The trip is 239,000 miles each way but it "won't come with any Hilton or Marriott points", DeWit joked.