Reno's isolation from major international gateways means there's no shortcut here: business class from Reno to Bergen always routes through at least one, often two, connecting hubs, and the honest total travel time — accounting for connections — typically runs well beyond the ~11 hours of actual flying. My preferred routing after years of testing options is SAS via Copenhagen or Oslo, since Scandinavian Airlines' A350 and A321LR business cabins offer flat-bed seats and a genuinely Nordic service style that feels appropriate once you touch down in Bergen's fjord-country air. Lufthansa via Frankfurt or Munich, with their evolving Allegris business suites on select routes, and KLM via Amsterdam, running comfortable 787 and A330 business products, are the two other viable options, each requiring a domestic-to-international connection from RNO through a hub like San Francisco, Los Angeles, or Seattle first.
The real insider move is booking the westbound domestic leg deliberately loose — I always build in at least 90 minutes at your US gateway, because Reno's limited daily departures mean a missed connection can strand you for a full day, and airlines rarely protect RNO passengers with the same rebooking priority as travelers originating at the hub itself. If routing through Amsterdam, use the extra layover time to shower and reset in KLM's Crown Lounge rather than pushing straight through — it makes the Bergen arrival, often into gray, drizzly weather outside summer, far more bearable. Frankfurt's connection times to onward Bergen flights can be tight in winter due to deicing delays, so Copenhagen or Oslo via SAS tends to be my most reliable pairing for this specific city pair.
Late spring through early autumn — May through September — brings not only Bergen's best weather and longest daylight, but also the softest business class fares of the year, as Norway-bound leisure demand competes less aggressively with the corporate travelers who dominate winter Frankfurt and Amsterdam routings. Given how thin and fare-volatile this Reno–Bergen corridor is, I'd strongly recommend setting up automated fare alerts rather than checking manually, since award and discounted business seats on these connections can appear and disappear within days.