There's no nonstop path connecting Music City to the fjords, which means every business class from Nashville to Bergen itinerary is really a study in European connections done well. The most reliable routings funnel through Amsterdam on KLM, Frankfurt or Munich on Lufthansa, or Copenhagen and Stockholm on SAS, with that final short hop into Bergen typically operated as a regional narrowbody flight—so your premium experience is front-loaded on the transatlantic leg, which runs roughly 9.5 hours from BNA to the European gateway. KLM's World Business Class on its 787s and A330s offers a comfortable staggered layout with direct aisle access on most configurations, while Lufthansa's mix of 747-8 and A350 business class (with newer Allegris cabins slowly rolling into the fleet) rewards those who can snag the updated hard product. SAS, meanwhile, flies a mix of A330 and A350 business class with fully flat seats, and its Scandinavian efficiency makes the Copenhagen or Stockholm connection feel less like a chore and more like a warm-up for the fjords ahead.
Having routed through all three hubs repeatedly, I'll say Amsterdam Schiphol offers the smoothest connection for jet-lagged travelers—its transfer security is fast, and KLM's Crown Lounge near the D/E pier is a genuinely restful stop before the Bergen leg. Frankfurt works well too, but only if you build in extra buffer time given its size and occasional congestion. My insider tip: book the SAS routing through Stockholm Arlanda when possible during summer—Arlanda's connection times are underrated, and SAS often prices Bergen as a low-cost add-on to the transatlantic business fare, effectively giving you Norway access for a marginal premium.
Late spring through early autumn—May through September—is when this routing shines, both for Bergen's famously fickle weather turning cooperative and for award and revenue fare availability loosening up as airlines add capacity. Because fares and premium award seats on this three-airline corridor fluctuate constantly with hub demand, setting up dedicated price and award-space alerts for the Nashville–Bergen corridor is the smartest move before locking in your connection city of choice.