"Homesick" received positive critical reception, with some critics considering the song one of the best from "Undone". "Homesick" was successful on both Christian and mainstream radio, peaking at the top on the "Radio & Records" Christian AC Indicator and Soft AC/INSPO charts, number 3 on the "Billboard" Hot Christian Songs and Hot Christian AC charts and the "Radio & Records" Christian AC chart, as well as peaking at number 9 on the "Billboard" Adult Contemporary chart. It was ranked at number 13 on the "Billboard" 2005 year-end Hot Christian Songs and Hot Christian AC charts, and at number 20 on the year-end Adult Contemporary chart.