Branson, who owns Virgin Mobile, is helping develop a facility in New Mexico from which spacecraft, mainly those from Branson’s Virgin Galactic, are expected to begin launching people into space by the end of the year.
A seat on one of the flights, accompanying actor DiCaprio, went for $1.5 million at a gala and auction at the Cannes Film Festival, according to Entertainment Online.
Another paid of flights went to a different bidder for $2.3 million, according to the Los Angeles Times.
Neither bidder has been identified yet.
Virgin Galactic is currently offering bookings on the flights for a deposit of $200,000.