Denver's thin air and the Rockies fade quickly once you're settled into a lie-flat seat pointed toward Scandinavia, and after a decade of crossing this particular stretch of the Atlantic, I can say with confidence that there's no nonstop option here—every itinerary in business class from Denver to Copenhagen routes through a connecting hub, most commonly United's Chicago or Newark gateways, or a Delta transfer via Amsterdam or New York-JFK partnered with SAS. That last detail matters for planning: travelers should expect one connection minimum, and the total journey, including layover, typically runs well beyond the ~10-hour air time alone.
United's Polaris business class, found on its 767 and 777 aircraft feeding into transatlantic legs, offers proper lie-flat seating with direct aisle access on most widebody configurations, and its Polaris Lounge in Chicago O'Hare is worth arriving early for if your connection allows. SAS, as Scandinavia's flag carrier, brings a distinct advantage on the Copenhagen end—its A330 and A350 business class cabins feature comfortable reclining seats, and landing into CPH on a Scandinavian carrier means faster immigration lines, since SAS crews and ground staff know the airport's rhythms intimately. Delta's option, often routed through Amsterdam or JFK with a codeshare onto SAS metal for the final hop, pairs Delta One's fully lie-flat suites (on select aircraft) with the reliability of Delta's North American network. My insider tip: book the SAS-operated final segment whenever possible rather than a codeshare on a partner aircraft, as SAS's Copenhagen-bound service tends to include a stronger Nordic-inspired meal service and quieter cabin energy, especially on evening departures.
Late spring through early autumn—May through September—consistently offers the best fare value and the added bonus of Denmark's long daylight hours upon arrival, ideal for shaking off jet lag with an evening stroll through Nyhavn. Given how fares fluctuate across three carriers and multiple hub combinations, setting up automated price tracking on this specific route is the smartest move for locking in premium-cabin value before seasonal demand tightens availability.
