31 Terah took Abram his son and Lot the son of Haran, his grandson, and Sarai his daughter-in-law, his son Abram's wife, and they went forth together from Ur of the Chaldeans to go into the land of Canaan, but when they came to Haran, they settled there. 32 The days of Terah were 205 years, and Terah died in Haran.
It appears that Terah originally wanted to go to Canaan, but either found something he preferred in Haran or lost heart and stopped there. Either a change of heart or a fainting heart led to him making Haran his home. His son, Abram, would finish the last leg of the journey and complete what his father left unfinished.