Travel the World on Cargo Cruises - Freighter ships offer passengers stops at unusual ports: Even the shortest leg, however, requires both time and flexibility. A 20-day voyage might come in at 19 or 22, as commerce and weather dictate. Rates start at about $130 a day. Working with a specialist travel agent is not just advised, it's pretty much mandatory. Cargo ships travel the world without consideration of tourist season; if there is a deep port there is probably a ship to get you there.