The England Under-21 international has been allowed to head back to his parent club early after the Clarets' play-off hopes ended with defeat at Leeds last weekend.
Delfouneso linked up with the Clarets in March and scored the winner on his debut at Hull, his only strike in 11 appearances for the club.
Boss Eddie Howe said: "Burnley Football Club would like to thank Nathan for all his efforts during his time with us and we wish him well on his return to Villa Park."
Delfouneso has been named alongside former Turf Moor team-mates Jay Rodriguez and Jack Cork in England's provisional squad for next month's European under-21 Championships in Denmark.
Source: PA
Source: PA