Zakynthos remains one of the few Greek islands that resists easy access from the American Midwest, which is precisely why savvy travelers routing business class from Detroit to Zakynthos treat the connection choice as the whole game. There is no nonstop option here—the honest answer is that every itinerary from DTW to ZTH's small, seasonal airport requires at least one, often two, connections, with Lufthansa via Frankfurt or Munich and British Airways via London Heathrow standing out as the two most reliable routings. Aegean Airlines then typically handles the final hop from Athens, a short intra-European segment where business class is more a curtain and a blocked middle seat than a lie-flat experience, so don't expect luxury on that last leg—save your enthusiasm for the transatlantic segment.
Having flown both major routings multiple times, I'd steer discerning travelers toward Lufthansa's Frankfurt connection when their Allegris-configured 787s or A350s are in rotation on the DTW segment, since the newer suites with sliding doors are a meaningful upgrade over the airline's older business product still flying some Detroit frequencies—always check your aircraft type at booking rather than assuming. British Airways' Club Suite, with its direct-aisle access and forward-facing configuration, is the more consistent bet if you're connecting through Heathrow, and Terminal 5's dedicated Concorde Room lounge makes a multi-hour layover genuinely pleasant rather than a chore. My insider tip: book the Athens-to-Zakynthos Aegean segment as a separate short-haul ticket only if your long-haul fare doesn't include it seamlessly—doing so gives you flexibility to shift that final flight by a day if island-hopping weather (common in the Ionian in shoulder season) causes delays.
April, May, September, and October are the sweet spot for this itinerary—airfares ease as summer crowds thin, Aegean's schedule to Zakynthos remains robust, and the island's beaches are far more enjoyable without July's heat. Because pricing on this three-airline, multi-connection route fluctuates with both transatlantic and intra-European demand, setting up fare alerts is the smartest way to catch a premium-cabin deal before it disappears.
