Missing a flight belongs to the same family as being late or unprepared — but with a specific added element: a flight has a hard, unmovable deadline, which is usually the key to reading this dream.
Running through the airport
The classic version — packing badly, running late, gates that keep moving further away. This almost always corresponds to a real opportunity or deadline in waking life that has a fixed, non-negotiable cutoff, and a fear that you won't make it in time despite your best effort.
Watching the plane leave without you
A more resigned version of the same dream, often appearing once the anxiety has shifted from "will I make it" to "I think I've already missed it" — worth noticing if your dream has recently shifted from chasing to watching.
Being at the wrong gate or airport entirely
This variation often reflects a fear that you're not just late, but working toward the wrong goal altogether — misdirected effort rather than insufficient effort.