Legoland's hometown airport isn't exactly a hub anyone stumbles into by accident, and that's precisely what makes routing strategy the whole game when booking business class from Denver to Billund. There's no nonstop option here—no carrier currently flies this pairing direct—so the real decision is which European gateway gets you there with the least friction. SAS routes travelers through Copenhagen, offering a short domestic hop to Billund on the same ticket, and their long-haul business cabin on the Airbus A330/A350 out of Denver features fully flat seats with direct aisle access, a natural fit for Scandinavia-bound flyers who appreciate SAS's understated, design-forward service. Lufthansa connects via Frankfurt or Munich, where their A350 business class (and increasingly the new Allegris cabin on select aircraft) offers more privacy and a wider seat, though Allegris hasn't yet been confirmed on all Denver rotations, so it's worth checking your specific aircraft before booking. KLM funnels through Amsterdam, pairing their reliable 787 or A330 business product with Schiphol's efficient transfer process, which regular flyers know beats Frankfurt for tight connections.
Having flown all three routings multiple times, my strong recommendation is Copenhagen as the connection point whenever schedules allow—not just for the shorter final leg, but because SAS's CPH hub handles the Billund connection with minimal fuss, and their lounge in Copenhagen is a genuinely relaxing place to decompress after nine-plus hours in the air. One insider tip: book the SAS domestic connector as part of the same itinerary rather than separately, since through-checked bags and protected connections save real headaches if the Denver departure runs late, which happens more often than carriers admit during winter storm season.
Summer offers the calendar's sweet spot, with May through September delivering both favorable award availability and Denmark's best weather for exploring beyond Legoland. Because fares on this three-airline route fluctuate with surprising frequency, setting up automated price tracking is the smartest way to catch a premium-cabin deal before it disappears.
