There is no nonstop path linking these two desert-and-fjord cities, so the real craft of booking business class from Tucson to Trondheim lies in choosing the right European gateway before the final short hop north. In practice this means routing through Frankfurt or Munich on Lufthansa, Amsterdam on KLM, or Copenhagen on SAS, each carrier offering a distinct long-haul product across the Atlantic before you connect onto a regional jet into Trondheim's compact Værnes Airport. Lufthansa's transatlantic widebodies increasingly feature the new Allegris business suite with a closing door on select aircraft, though older 747-8 and A340 configurations still fly many US routes, so it's worth checking your specific aircraft type at booking. KLM flies World Business Class on its 787 and 777 fleet, a comfortable if understated product, while SAS offers a more direct sensibility for Scandinavia-bound travelers with its A330 and A350 business cabins connecting neatly through Copenhagen, its home hub.
Having flown this corridor several times, my preference tilts toward the Copenhagen connection on SAS whenever schedules align, simply because the short final leg to Trondheim feels like a natural extension of Scandinavian travel rather than an afterthought bolted onto a US-Europe itinerary. Frankfurt works well operationally too, especially if you have Star Alliance status, since Lufthansa's business lounges there allow a proper shower and reset before the final descent into Norway. One insider tip rarely mentioned: book the earliest morning connection out of your European hub into Trondheim, as Værnes sees frequent afternoon fog in the shoulder seasons that can cascade into delays by midday, something locals and flight crews quietly plan around.
May through September remains the sweet spot for this journey, both for fare value and for Trondheim's long daylight hours, which make even a redeye-heavy itinerary feel worthwhile once you land. Because pricing on this three-airline, one-connection route fluctuates with fuel surcharges and seasonal demand into Scandinavia, setting up fare alerts is the smartest way to catch the periodic dips before they vanish.
