Foles was drafted in the third round of the 2012 draft by the Eagles and had played as the backup to Michael Vick until Nov. 11, when Vick suffered a concussion during a game.
Vick still hasn't passed the necessary tests to return to the field following a concussion. Reid said that and Foles' serviceable numbers the past few games made the decision easy.
"I think where we're at right now in the season, I think it gives the kid an opportunity to play and finish it up," said Reid of Foles. "I just think he's playing well enough, number one, to where I think he can win football games for us, and then, two, I think where we sit at this position in the season, I think it's the right thing to do."
Foles spent three years at Arizona after transferring from Michigan State as a freshman. He was one of the top quarterbacks in the Pac-12 in 2011, leading the conference in completions, attempts and passing yards.
He is 0-3 as a starter with the Eagles but has shown improvement with each start. Last Sunday, in a loss to the Dallas Cowboys, Foles was 22-for-34 on his attempts for 251 yards and a touchdown.