Fourteen years of connecting through European gateways has taught me that the routing matters more than the airline logo on your boarding pass when it comes to reaching Dalmatia in comfort. There is no nonstop option for business class from San Jose to Split — every itinerary requires at least one connection, typically through a major East Coast or European hub, with total travel time running roughly 13 hours in the air plus connection time. American, Delta, and United all serve this corridor through their transatlantic joint ventures, meaning your best bet is booking American via London or Philadelphia, Delta via Amsterdam or Paris, or United via Frankfurt or Newark, then picking up a regional partner into Split's compact airport, which handles a surge of seasonal traffic each summer.
My preferred routing has long been Delta through Amsterdam, where the KLM Crown Lounge offers a genuinely relaxing layover before the short hop down to the Adriatic — Delta's A330 and A350 business class cabins, with lie-flat suites and Westin Heavenly bedding, make the long Pacific-to-Atlantic haul tolerable. United's Polaris seats on its 777 and 787 fleet, paired with a Star Alliance connection through Frankfurt via Lufthansa, is another strong choice, especially given United's daily Newark departures. American flyers should route through Philadelphia or JFK to catch a British Airways or Iberia codeshare, landing in Split after a quick continental connection — just budget extra time at Heathrow, where transfer queues in Terminal 3 to 5 can eat 45 minutes you didn't plan for.
Split's airport gets congested with charter and leisure traffic from June through August, so I steer clients toward April, May, September, and October, when award space opens up and the Dalmatian coast is arguably more beautiful without the crowds. One insider tip: booking the transatlantic long-haul segment separately from the short regional connector into Split, rather than as one ticket, sometimes unlocks better business class award availability on partner airlines. Given how fares fluctuate across these three carriers and their alliance partners, setting up fare alerts for this specific routing is the smartest way to catch a premium seat at its best value.
