The 747-200 fuel capacity is 52,410 gallons. It's range is 7,900 nm. Fuel price changes, so right now at JFK, for Jet-A fuel,it is $5.94 per gallon.
So 5.94 x 52,410 = $311,315. That's just to fill up the plane. That comes to roughly $39 per nm. From JFK to St. Petersberg is 3,729 nm.
So roughly per one way trip, $146,948.