Trondheim rarely appears on the radar of American business travelers, which is precisely why the routing deserves careful thought. There is no nonstop option: business class from Milwaukee to Trondheim requires a connection, and after dozens of trips through this corridor, I've settled on three viable strategies via SAS through Copenhagen or Oslo, Lufthansa through Frankfurt or Munich, and KLM through Amsterdam. Total journey time typically runs 12-15 hours including the connection, though the transatlantic segment itself clocks in around 8.5 hours. SAS makes the most geographic sense given its Scandinavian home turf—their A330/A350 business class offers a proper flat-bed with direct aisle access on the widebodies, and Copenhagen's compact layout makes tight connections manageable. Lufthansa's strength lies in Frankfurt's robust business lounge network and their newer Allegris cabin now rolling out on select long-haul routes, though you'll want to confirm aircraft type before booking, as older 747 and A340 configurations still fly parts of this network. KLM routes through Amsterdam with their World Business Class product, a reliable if unglamorous 2-3-2 or 2-2-2 layout depending on aircraft.
My strong preference is the SAS-heavy itinerary, particularly through Oslo, where the connection to Trondheim domestic often departs from a gate close enough to make a 70-minute layover feel comfortable rather than harrowing—something you won't find flagged in most booking engines. Arrive at Milwaukee's Mitchell International with extra buffer in shoulder season, as Midwest connecting weather delays can cascade into missed European legs. Trondheim itself rewards patience: the midnight sun window from late May through July transforms the fjord approach into something genuinely memorable, and this same stretch—May through September—consistently offers the most favorable business class award and cash fare availability across all three carriers.
One insider trick: KLM's Amsterdam connection to Trondheim sometimes operates on a smaller Embraer or 737 configuration without a true business cabin, so if cabin continuity matters to you, verify the intra-European aircraft before ticketing, not just the transatlantic segment. Given how thinly these premium seats sell on the Trondheim legs specifically, fares fluctuate more than on mainstream European routes—setting up fare alerts for this specific city pair will save far more legwork than manually checking each carrier's site weekly.
