There's no nonstop way to reach Dalmatia's coast from Music City, and that's precisely what makes routing strategy the whole game when booking business class from Nashville to Zadar. With no direct service available, every itinerary funnels through a European hub, and the two smartest options are Lufthansa via Frankfurt or Munich, or Turkish Airlines via Istanbul, with Croatia Airlines (OU) typically handling the final short hop into Zadar's compact airport. Total journey time runs about 11.5 hours of flying, but factor in a realistic 5-7 hour total travel window once you account for the transatlantic leg, the connection, and that last puddle-jump on a Croatia Airlines Dash 8 or A319.
Having routed through both Frankfurt and Istanbul repeatedly on this exact itinerary, I'd steer discerning travelers toward Lufthansa's long-haul metal out of a US gateway (Nashville itself isn't a Lufthansa hub, so you'll first position through Chicago, Newark, or Atlanta), then transfer onto Lufthansa's Boeing 747-8 or A350, where the newer Allegris business suites with sliding doors are gradually rolling out on select routes — worth checking your specific tail number before booking. Turkish Airlines, meanwhile, offers a genuinely underrated business class product with lie-flat seats and a la carte dining, plus their Istanbul lounge is one of the most spacious hub lounges in Europe, ideal for a long layover before the Zadar connector. My insider tip: book the Zagreb-routed Croatia Airlines connection rather than a direct Frankfurt-Zadar hop when available in shoulder season, since it often opens up better business award space on the transatlantic segment.
Zadar itself sees limited seasonal capacity, with most meaningful service (and mileage upgrades) concentrated April through October, so April, May, September, and October remain the sweet spot — warm Adriatic weather without the peak summer crush at passport control. Because award availability and premium fares on this Frankfurt-Istanbul-Zadar corridor fluctuate significantly by week, setting up automated fare tracking is genuinely the smartest move before you commit to dates.