A dream where you are travelling represents how you go about your daily life and how you are progressing through your life.
If you make a short trip in the dream then it may suggest that you are exploring a concept or idea in some current aspect of your waking life, whereas a long trip may imply that you are moving away from your loved ones or someone you usually spend time with.
If you face difficulty during your journey but manage to get through it then this may suggest that in some part of your past in your waking life you have managed to get through problems or setbacks.