I was recently asking my instructor this, only I was asking about the cost of importing from Holland to Arizona (so probably more expensive). She said that to factor in everything, meaning not just the flight, but also the stay in quarantine, traveling from Los Angeles (where they fly into) to Arizona, etc. is roughly 10k.
I did Germany to NY for a gelding several years ago (2004). At that point it was about $5000-$6000 which included getting picked up at the barn in Germany, shipping to Amsterdam, staying there overnight, flight to JFK, shipping to quarantine, & 2 nights in quarantine. Mares & stallions have to stay in quarantine longer so it costs more. I went through Peden Bloodstock.
From where we are to NY (incl. Quarantine) we've dealt with $7,087 US recently. We're about one hour west of Hanover if that helps you anything.
On top you need to get the horse from Newburgh (JFK quarantine) home so it really depends on the ground transfer costs whether you end up at 7K or 10K