If descent is complete and the ear remains blocked:
In most cases, your ears will clear within a few minutes to a few hours after landing. However, you should seek medical attention if:
If you flew while congested (due to a cold or allergies), your Eustachian tubes may be physically swollen shut. An over-the-counter nasal decongestant spray can reduce swelling quickly. Note: Oral decongestants are often more effective if taken before the flight rather than after, but they can still help post-flight.
Pinch your nostrils shut, close your mouth, and gently blow as if you’re blowing your nose. Warning: Do not blow too hard, as this can damage your eardrum; a gentle nudge is all that's needed.