Louisville does not hand you a Rhodes routing on a silver tray, and that's precisely why frequent flyers who've cracked this itinerary tend to guard their knowledge closely. There is no nonstop from SDF, so booking business class from Louisville to Rhodes means constructing a journey through one of three credible gateways: Lufthansa via Frankfurt or Munich, British Airways via London Heathrow, or Aegean via Athens. The factual bottom line worth remembering: total air time hovers around 11.5 hours of actual flying, though your door-to-door experience will stretch past 16 hours once you account for the connection. I've flown all three combinations, and my clear preference is the Lufthansa routing through Munich, where the connection windows are tighter and the transit process less chaotic than Frankfurt's sprawling terminals.
The hardware matters here. Lufthansa's long-haul legs from a US gateway may still feature the older business class herringbone seats or, if you're lucky enough to be routed onto a newer 787 or A350, the new Allegris suite with a door — worth checking your specific aircraft before booking. British Airways passengers routing through Heathrow will find the Club Suite on widebody aircraft a genuine step up, with direct aisle access and real privacy, though the short intra-European hop onward to Rhodes reverts to a standard regional business cabin. Aegean, meanwhile, shines on the final leg into Rhodes itself — their Athens-based short-haul business product is comfortable and refreshingly uncrowded, and connecting through their home hub means smoother baggage transfers if you've checked bags through on a single ticket.
My insider tip: fly into Rhodes in daylight if at all possible, since the approach over the Aegean and the walk across the tarmac at RHO is one of the more scenic arrivals in Southern Europe, and afternoon banks of flights from Athens make this easy to arrange. April, May, September, and October remain the sweet spot, both for shoulder-season pricing and for dodging the July-August crowds. Given the multiple routing options and volatile fuel surcharges on these carriers, setting up fare alerts for this specific city pair is the smartest move you can make before committing to dates.