There's a particular satisfaction in threading John Wayne Airport's boutique-scale efficiency into a journey that ends in the cobblestoned old town of Vilnius, and after logging this routing more times than I can count, I can say definitively: there is no nonstop option, so business class from Orange County to Vilnius always routes through a major East Coast or European gateway, typically on American, Delta, or United metal paired with a joint-venture partner for the transatlantic leg. My preferred pattern is departing SNA early on United or American to reach a hub like Chicago, Newark, or Dallas, then connecting onto a widebody transatlantic service—United's 767 or 777 business cabins with Polaris seating, or American's Flagship Business on their 777-300ER, both featuring lie-flat suites with direct aisle access—before finishing with a Star Alliance or SkyTeam partner into Vilnius, since none of the big three fly there directly.
The critical connection point is usually Frankfurt, Munich, or Warsaw, and this is where insider knowledge pays off: build in at least a 90-minute buffer at these hubs, because Vilnius-bound flights often operate from remote gates requiring bus transfers, and immigration in Lithuania, while quick, can bottleneck if your connection lands alongside several regional arrivals simultaneously. I've found that flying through Munich rather than Frankfurt tends to shave stress off the layover, thanks to cleaner signage and shorter walks between Star Alliance connections. If you're using miles or planning an upgrade, request seat assignments the moment award space opens, since the widebody legs into Chicago or Newark from SNA are limited in premium cabin inventory and get squeezed fast during the May-to-September travel window, which also happens to be peak season for Baltic tourism and the best stretch for fare value.
Given the multi-carrier complexity of this itinerary, pricing fluctuates more than typical single-carrier routes, and business class award space or discounted fares can appear and vanish within days. Setting up automated fare tracking for the Orange County–Vilnius corridor is the smartest way to catch those windows before they close.