Reykjavík has a way of humbling frequent flyers who think they've seen every angle of transatlantic travel, and the Nashville routing to Iceland's capital is one of the more curious puzzles in premium cabin planning. There is no nonstop option here: business class from Nashville to Reykjavík requires a connection, most reliably through Delta's hub network via Boston, New York-JFK, or Minneapolis, where Delta One passengers transfer onto Icelandair-operated or codeshare metal, or through United's Newark or Chicago gateways feeding into Icelandair's own Saga Class product. Icelandair's Saga Class, flown on its 757 and 767 fleet, remains a comfortable if modest offering — think wide recliner-style seats with good legroom rather than a full lie-flat suite — so travelers prioritizing horizontal sleep should route through Delta's JFK or Boston connections to access Delta One's proper flat-bed seats on the transatlantic long-haul segment, saving the shorter Icelandair hop for daylight hours when recline matters less.
Having connected through both Boston Logan and JFK's Terminal 4 on this exact itinerary, I've found the tighter, more reliable connection window sits at Boston, where Delta's operations are less prone to the gate congestion that plagues JFK during peak summer banks. Keflavík itself rewards early risers — clear immigration fast, and if your layover allows, the Blue Lagoon transfer service outside the terminal is far less crowded before 9am than the tour-bus crush that arrives by midday. Seasonality matters enormously on this corridor: May through September brings not only the best chance of clear skies for that first glimpse of Icelandic coastline, but also the widest inventory of premium award and revenue seats, since Icelandair and its partners ramp capacity for the summer surge before cutting back sharply in winter.
Given how thinly this route is served in true lie-flat business class, fares swing unpredictably with fuel costs and seasonal demand — which is exactly why setting up automated fare alerts for this specific city pair, rather than checking manually, tends to be the smarter long-term strategy for landing a premium seat at a fair price.
