両方とも正しいです。(Both are correct.) うち　に　かえります。 うち　へ　かえります。 へ and　に are mostly changeable　as a direction particle. But, there are some cases when we don't use へ. #1　when objects are close to each other. アルバム（〇に　？へ）写真（しゃしん）をはる。(アルバム and 写真 are close） 壁（〇に　？へ）絵をかける。（壁 and 絵 are close） #2　some idiomatic phrases お風呂（〇に　？へ）入る。 電車（〇に　？へ）乗る。 The followings might be useful if you'd like to go deeper: に is used for destinations or small range. へ is used for directions or wide range. The following sentences both mean that I go to a park, but #4 put more weight on the direction than the goal itself. #3 公園に行く。 #4 公園へ行く。 However, please let you remind that these differences are so subtle that people don't think about much sometimes.

「かえります」can already mean 'going home'. When someone says "かえります" it means he/she is going home. You do not have to add 'house/home' to your sentence. As far as I know are に　and え interchangable when used as 'to'.