The France international had not featured for Newcastle this season after a reported falling out with manager Alan Pardew towards the end of the last campaign.
The 27-year-old has been given the chance of a fresh start at the KC Stadium and Ben Arfa was delighted to complete his move to last season’s FA Cup finalists.
“Monday was a long day but I am very happy to be here,” Ben Arfa told the club’s official website.
“When I woke up on Monday morning, there was nothing on the cards. Then, in the afternoon the call came and everything happened very quickly after that. At 1am everything was complete and I was very happy.
“I’m very much looking forward to the start of a new challenge. The manager wants me here and that is very important. I’m looking forward to being back on the pitch after two months of only training.”
Ben Arfa was one of 11 signings made by Hull during the transfer window and the attacker is impressed by the quality at manager Steve Bruce’s disposal.
He added: “The manager has made a lot of very good signings.
“There were many good players already here and then more have arrived this week. There is a very good squad here and I think the team can do something great for this city.”