The $1 million price tag benefited AIDS research, but regular tickets for Virgin Galactic's commercial spaceliner sell for $250,000. DiCaprio, Ashton Kutcher, Angelina Jolie, and Justin Bieber already have reservations. The first commercial flight could happen this year.

As if flying to space weren't exciting and surreal enough on its own, someone just plunked down nearly $1 million to make the trip with movie star Leonardo DiCaprio.

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DiCaprio plans to fly aboard Virgin Galactic's suborbitalSpaceShipTwo space planein 2015. A seat on the same flight with the actor sold for 700,000 euros ($954,000 at current exchange rates) on May 22 at the annual amfAR auction near Cannes, France, which benefits AIDS research,Variety reported.

The 2015 DiCaprio flight is filling up fast; at last year's amfAR auction, three other seats on it sold for a combined $3.8 million. (SpaceShipTwo can accommodate six passengers and two pilots.)

TheSpaceShipTwo spacelineris designed to be carried up to an altitude of about 50,000 feet (15,000 meters) by a mothership named WhiteKnightTwo. After being dropped, the space plane's rocket engine fires up, boosting the vehicle into suborbital space.

Passengers aboard SpaceShipTwo will get to see Earth against the blackness of space and experience a few minutes of weightlessness, Virgin Galactic representatives say.

Regular tickets to ride the commercial spaceliner sell for $250,000, and to date more than 700 people have put down deposits to reserve a seat. DiCaprio is not the only celebrity with plans to fly; actors Ashton Kutcher and Angelina Jolie have booked tickets, as has singer Justin Bieber.

And Virgin Galactic's founder, billionaire Sir Richard Branson, has said he and his family will be aboard the first commercial flight of SpaceShipTwo.

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Trip to space with Leonardo DiCaprio auctioned off for $1 million