I did a transatlantic repositioning cruise from Miami to Barcelona - cruise ships tend to move fleets in April from US and they return usually in November from Europe - I didn't go fancy at all but the rates are generally low! Pick a ship low end to high end. I paid $550 pp for balcony 11days on NCL Epic (first time big ship and NCL def not fancy) but smooth sailing entire time. Flew home BA J from London on points