"Journey" and "travel" are synonyms, meaning that they both have meanings so similar that they are generally interchangeable. However, "journey" usually implies something akin to an adventure or a long-lasting experience. "Travel", alternatively, usually implies that something is not as long-lasting as a journey and generally refers to a vacation.
Also, "journey" is generally used as a noun, while "travel" is generally used as a verb. Each have both noun and verb definitions, however.
Ultimately, it is up to you to decide which word you would like to use!