Time travel dreams are less common than most dream types, and their meaning hinges almost entirely on direction: whether you're travelling to the past or the future.
Travelling to the past to change something
This version usually reflects a specific regret — a decision, conversation, or event you wish had gone differently, and that you're still mentally revisiting even if you don't dwell on it consciously during the day.
Travelling to the past just to revisit it
Distinct from wanting to change something — this often reflects simple nostalgia, a longing for a period of life that felt simpler, safer, or happier than your current one.
Travelling to the future
Usually relates to anxiety or anticipation about an upcoming event or decision — the dream is your mind attempting to "preview" an outcome you're currently uncertain about.