I keep hearing crackling and popping noise and my ears are always itchy. Is this allergies or something else?

Could be. These symptoms do suggest possible allergy. They also suggest eustachian tube dysfunction which can accompany allergies or sinus infections. Allergy testing in combination with a thorough history and physical exam can be helpful to diagnose whether allergy is the most likely cause of these symptoms.
Could be. Cracking or popping in the ears often is due to plugging of the tube that runs from the ear to the back of the throat, which can become swollen and non-functional with allergies. Allergies can also cause itching in the ear canal.