Foles has started three games since Michael Vick was concussed in November, and now will start the rest of the season for the Eagles.
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.