After a dozen or so redemptions and revenue bookings on this itinerary, I've settled into a firm conviction: there's no nonstop answer here, and anyone searching for business class from Seattle to Naples needs to think in terms of a European gateway rather than a single flight number. The route always requires a connection, typically through Frankfurt, Munich, Rome, or Paris, since Alitalia's successor ITA Airways (AZ), Lufthansa (LH), and Air France (AF) all route Seattle-Naples traffic through their respective hubs rather than offering anything direct. Total journey time runs around 12.5 hours of flying, but with a connection built in, plan on 15-17 hours door to door — a fact worth noting for anyone comparing this to true long-haul nonstops elsewhere in Europe.
My preference leans toward Lufthansa via Frankfurt or Munich, particularly if you can snag one of their newer Allegris-configured 787s or A350s on the transatlantic leg out of Seattle; the sliding privacy doors and Allegris suite variety (some seats even have adjustable window sizes) are genuinely a cut above older Lufthansa business cabins. Air France routes through Paris CDG, and their A350 business class with its intuitive seat controls and Air France's Terminal 2E lounges make for a civilized layover, especially if you have 90+ minutes to enjoy a proper pre-flight meal rather than airport sandwiches. ITA Airways, flying through Rome Fiumicino, offers a shorter final hop into Naples and their A330 business class product, which feels more intimate given ITA's smaller widebody fleet — a nice way to ease into Campania after a long transatlantic sector.
One insider tip: book the earliest Rome-Naples or Frankfurt-Naples connection you can find, since Naples airport's afternoon congestion (particularly in summer) can turn a tight layover into a stressful sprint. April, May, September, and October remain the sweet spot for this routing — shoulder-season fares soften considerably while Naples and the Amalfi Coast are at their most walkable. Given how much fare volatility exists across three carriers and multiple hub options, setting up automated fare alerts for this specific city pair is the smartest way to catch a premium-cabin deal before it disappears.
