Green Airport doesn't exactly scream "gateway to the Adriatic," but that's precisely what makes routing business class from Providence to Dubrovnik such an interesting puzzle for those of us who've worked out the kinks over multiple summers. There's no nonstop option here, obviously—PVD's runways aren't built for that kind of range—so the real decision happens at the connection. Delta routes most efficiently through JFK or Boston into Amsterdam, feeding onward to Dubrovnik via KLM's European network, and their Delta One suites (the reverse-herringbone product on 767s and A330s) make the transatlantic leg genuinely restful. American funnels traffic through Philadelphia or JFK into London Heathrow or occasionally Zurich, with their Flagship Suite on 777s and select 787s offering doors and solid privacy, though onward connectivity to Croatia can mean a partner carrier for the final short hop. United, meanwhile, favors Newark as the transatlantic hub, connecting through Frankfurt or Munich with Lufthansa or Austrian metal for the last leg, and their Polaris seats on 777-300ERs remain a dependable, if not flashy, choice.
The insider trick most travelers miss: book the Providence-to-hub domestic segment as a separate positioning flight only if award space opens up on a different carrier than your intercontinental leg—mixing Delta's domestic reliability with a Lufthansa Allegris booking out of Frankfurt, for instance, can unlock better business seats than sticking to one alliance end-to-end. Dubrovnik's airport itself is compact and refreshingly low-stress, but summer congestion is real; arriving mid-morning avoids the worst of the tour-group crush at passport control.
Shoulder seasons—April, May, September, and October—are where this route earns its stripes, both for weather (walkable Old Town temperatures, calmer Adriatic light) and for award or premium fare availability, since summer capacity gets swallowed by leisure demand. Given how fluid space is across these three carriers and their partners, setting up fare and award alerts well before you plan to travel is the smartest move you can make on this particular itinerary.