The US international is expected to be unveiled at a press conference held by the Tigers on Thursday afternoon.
Altidore hinted at the move on his Twitter site, saying: "First match is against Chelsea subject to a work permit.
"Thanks for the support and love. Keep it coming."
The Villarreal striker has been linked with a move away from El Madrigal for the past week or so with Everton and Fulham also mentioned but it seems he will almost certainly land at Hull’s KC Stadium.