Clogged Ear From Flying -

During descent, the cabin pressure rises rapidly. The air outside your ear is becoming denser, while the air trapped inside your middle ear remains at a lower pressure. Nature abhors a vacuum, and now, you have one inside your head.

Most clogged ears resolve within a few hours to a day. If it lasts longer than 2–3 days with no improvement, see an ENT specialist. clogged ear from flying