For perspective, it cost about $200 million to get your name on an America's Cup trophy. So as billionaire vanity projects go, this is pretty reasonable.

Appears to be around $80M per seat. Great graph of how it increase from $20M in 2008 to $80M today after NASA permanently grounded its space shuttles:

http://www.businessinsider.com/space-travel-per-seat-cost-so...

On a different end of the spectrum, Emily Calandrelli is giving a $35M figure for the last ISS ticket: https://twitter.com/TheSpaceGal/status/836333012056842240

At least from NASA's standpoint, looks like they budget single-digit $Billions for human spaceflight, out of a yearly budget in the range of $18B. I'm not sure how cleanly that can be broken down per-mission, since stays aboard the ISS can now exceed 12 months. https://spaceflightnow.com/2015/02/02/nasa-outlines-fy-2016-...

$82 millions according to the announcer at Kennedy Space Center while I was waiting for the Falcon 9 launch.

Are you talking about unmanned mission? Because he specifically mentioned crewed mission.

I am talking about the price Russia charges the US to send one human to the ISS. I guess the announcer wasn't correct. That amount would be for 2018.

http://www.businessinsider.com/astronaut-cost-per-soyuz-seat...

If I remember correctly, the price of a Soyuz seat is around $20,000,000USD for tourists, with NASA's price to fly on Soyuz being much higher per seat.