Trondheim's Værnes Airport rarely appears on the radar of American business travelers, which is precisely why those who've cracked the code on this connection tend to keep it quiet. There is no nonstop option here—business class from Phoenix to Trondheim requires a routing through a major European hub, with Amsterdam, Frankfurt, or Copenhagen serving as the practical gateways, and total journey time typically runs 14 to 16 hours including the connection, against roughly 10.5 hours of actual flight time. I've routed this trip through all three hubs, and my clear preference is KLM via Amsterdam, where the Boeing 787 or A330 business class delivers a comfortable lie-flat seat and Schiphol's efficient transfer process minimizes the anxiety of a tight connection into Trondheim's smaller regional terminal.
Lufthansa via Frankfurt is worth considering if their new Allegris business class happens to be configured on your specific routing, though availability remains inconsistent as the rollout continues—always confirm aircraft type before booking rather than assuming. SAS, as Scandinavia's home carrier, offers a compelling alternative via Copenhagen, and their business class product feels most attuned to the Nordic sensibility you're flying toward, with a shorter final hop into Trondheim that Scandinavian frequent flyers favor for its simplicity. My insider tip: book the earliest possible connecting flight into Trondheim rather than a late-evening arrival, since Værnes' ground transport into the city thins out considerably after dark, and Trondheim's northern latitude means daylight (or its absence, depending on season) dramatically shapes your first impressions of the city.
Late spring through early autumn—May through September—consistently offers the best value on this Phoenix-to-Trondheim corridor, coinciding with Norway's midnight sun season, when demand from leisure travelers heading to the fjords creates fluctuating award and premium cash fares across all three carriers. Given the multiple routing options and the volatility in Allegris and KLM award space, setting up fare alerts across these hub combinations is the smartest way to catch a premium seat before it disappears.
