Remove and discard giblets and neck from chicken; trim excess fat. Starting at neck cavity, loosen skin from breasts and drumsticks by inserting fingers, gently pushing between skin and meat.
Combine oregano, cumin seed, garlic, oil, salt, and ground cumin in a small bowl. Rub seasoning mixture under loosened skin and over breasts and drumsticks. Tie ends of legs together with twine. Lift wing tips up and over back; tuck under chicken. Place chicken, breast side up, on a rack coated with cooking spray, and place rack in a roasting pan.
Bake at 375° for 40 minutes.
Increase oven temperature to 450° (do not remove chicken from oven); bake an additional 12 minutes or until a thermometer inserted in the meaty part of thigh registers 165°. Remove chicken from pan; let stand 15 minutes. Remove skin from chicken; discard.
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