You're at an airport, or on a train, or driving somewhere unfamiliar. Sometimes the journey is smooth and purposeful; sometimes you're lost, delayed, or going the wrong way. Travel is one of the richest and most consistent dream metaphors — because in human experience, journeys and life paths are deeply connected.
The journey as metaphor
The most important frame for travel dreams: the journey usually represents your path through life, a current transition, or the direction you're heading. The destination, the mode of travel, and the quality of the journey all carry meaning.
Airports and planes
Airports represent transition and threshold — you're between one phase and another. The experience at the airport in the dream tends to mirror how you feel about the transition itself: smooth and purposeful, or chaotic and delayed.
Planes tend to correspond to ambition, speed of change, and significant life transitions (as opposed to the slower, earthbound movement of trains or cars). Missing a flight is among the most common travel anxiety dreams.
Trains
Trains often represent a journey that is following an established track — less freedom than driving, but also the sense of being on a defined route. Train dreams can correspond to feeling that your life is moving along a predetermined path, or to the reliability (or unreliability) of that path.