For a direct flight, you're looking at about a ~10hr flight (~5620KM's). For that range, you're looking at anywhere between 10-15k/hour average price (eg: G-IV, G-650 type planes). In reality the price is higher because if you're paying for just one way, then you have to pay the same hourly rate for the plane to fly back to Colorado. If you're paying round trip, then you have to pay daily parking charges + crew fee, which adds up quickly.