Pula's tiny Istrian airport, with its single seasonal runway of international arrivals, has never seen a nonstop widebody from New England, and it never will—so the real craft in booking business class from Boston to Pula lies in choosing the right connection rather than the destination itself. There is no single-carrier nonstop; instead, the smart routing runs through Munich or Frankfurt on Lufthansa, through Istanbul on Turkish Airlines, or via Zagreb on Croatia Airlines for the final short hop. My preference over a dozen crossings has been Lufthansa via Munich, where the airline's long-haul Boston service (operated with 787s or A350s depending on season) increasingly features the new Allegris business suite with a closing door—worth requesting specifically when booking, since older configurations still fly some Boston rotations. Total journey time door-to-door runs close to fourteen hours once you factor the Munich-Zagreb-Pula or Munich-direct seasonal legs, so I always build in at least a 90-minute connection buffer in Munich's Terminal 2, which handles Lufthansa's Star Alliance partners efficiently but fills quickly during the Croatian summer surge.
Turkish Airlines via Istanbul is the sleeper option here: its lie-flat business class and genuinely excellent IST lounge make the long layover feel like part of the vacation rather than an obstacle, and Istanbul's geography often yields better fares than the German gateways in shoulder season. My insider tip, learned the hard way after a July nightmare of packed connections: fly through Munich or Frankfurt only in April, May, September, or October, when Croatia-bound leisure traffic hasn't yet overwhelmed the intra-European feeder flights—summer sees these short hops sell out or downgrade business passengers to economy-style regional jets with no true business cabin at all.
Because fares into secondary European leisure airports like Pula swing dramatically with the Adriatic season, setting continuous fare alerts across all three carriers—Lufthansa, Turkish, and Croatia Airlines codeshares—remains the only reliable way to catch a genuine business class fare before the summer premium sets in.