This is a common condition called ear barotrauma, caused by pressure changes during your flight while congested. To relieve the blockage and pain, you can use a nasal decongestant spray containing oxymetazoline for up to 3 days. An oral decongestant like pseudoephedrine can also help reduce Eustachian tube swelling. For the pain, try over-the-counter pain relievers like ibuprofen or acetaminophen. Gently swallowing, yawning, or using a warm compress can also provide comfort. Please avoid using the nasal spray for more than 3 to 5 days. If the pain persists, worsens, or is accompanied by hearing loss, please consult a doctor for an evaluation.