Trondheim rarely enters the conversation when American travelers plan a Norwegian escape, which is precisely why the routing deserves attention: there is no nonstop option from St. Louis, so business class from St. Louis to Trondheim always involves a connection, typically through Frankfurt, Amsterdam, or Copenhagen. Lufthansa runs its evolving Allegris business class on select long-haul frankfurt sectors, though many STL-originating itineraries still fly the reliable 747-8 or A350 business product depending on aircraft assignment that season. SK Scandinavian Airlines, meanwhile, is the natural finishing airline for this trip, connecting through Copenhagen with its A350 business seats before a short intra-Scandinavian hop up to Trondheim's compact TRD airport, where arrivals clear quickly and taxi queues are minimal even in peak summer.
Having routed through all three hubs repeatedly, I've found Copenhagen the most civilized connection for this journey — SAS's lounge access and short walking distances make tight layovers manageable, and their onward flights to Trondheim run frequently enough that a missed connection rarely costs more than an hour. KLM's Amsterdam routing via its A330 or 787 business class cabins works well too, especially if you want Delta SkyMiles or Flying Blue redemption flexibility, and Schiphol's transfer process remains one of Europe's smoother experiences despite its size. My insider tip: book the SAS-operated Trondheim leg as a separate short-haul economy fare paired with a long-haul business ticket into Copenhagen or Oslo — this "positioning" trick often unlocks better award availability than searching STL-TRD as one continuous itinerary.
Seasonality matters enormously here — May through September aligns with both better weather in Trondheim and looser business class award space across SK, LH, and KL, as demand shifts toward beach routes rather than northern Norway. Given how thinly this route is served and how quickly premium inventory disappears on the Scandinavian legs, setting up fare and award alerts well in advance is the smartest move any serious traveler can make before booking.
