# Chicago to Trondheim: A Business Class Route That Rewards the Well-Prepared
There is no nonstop path connecting these two cities, which means booking business class from Chicago to Trondheim requires a connection through one of three credible European gateways: Copenhagen via SAS, Frankfurt or Munich via Lufthansa, or Amsterdam via KLM. Each carrier offers a distinctly different onboard experience for the transatlantic leg before you drop into a shorter regional hop up to Norway's Trøndelag region. SAS routes you through its home hub of Copenhagen with lie-flat seats in a 1-2-1 configuration on its long-haul A330 and A350 fleet, making it the most logical single-carrier option since SAS also operates the short connecting flight to Trondheim. Lufthansa flies its updated business class product, part of the Allegris rollout on select aircraft, though older 747-8 and A340 configurations still appear on Chicago departures, so it's worth checking your specific equipment before booking. KLM, meanwhile, offers its recognizable World Business Class cabin out of Amsterdam, a reliable if unglamorous option with strong connection timing into Trondheim's compact airport.
Having flown this corridor across several seasons, I've found the SAS routing through Copenhagen consistently the smoothest — immigration and security in CPH move quickly, and the gate-to-gate connection window rarely exceeds ninety minutes, critical when you're arriving jet-lagged from a ten-hour transatlantic sit. My insider tip: fly into Trondheim on the early morning SAS connection rather than the afternoon rotation. The morning flight uses a larger regional aircraft with a proper front cabin, while afternoon frequencies sometimes downgrade to all-economy configurations depending on the season.
Late spring through early autumn — May through September — is when Trondheim earns its reputation as a gateway to the midnight sun, and it's also when award availability loosens on all three carriers as leisure demand shifts capacity planning. Fares and premium inventory on this route fluctuate more than travelers expect given how niche the destination is, so setting fare alerts for the ORD–CPH–TRD or ORD–FRA/MUC–TRD combinations well ahead of your travel window is the smartest way to catch a business class seat before it disappears.
