Route notes
Why this routing works
This routing uses New York City as the first stop before crossing the Atlantic to Lisbon, then keeps the European segment moving east through Barcelona and Naples. That sequencing groups the shorter intra-Europe flights together before the longest transpacific sector later in the trip.
With 4 nights in New York City, 6 in Lisbon, 4 in Barcelona, 6 in Naples, and 4 in Seoul, the schedule spreads time across five stopovers without adding extra backtracking. The stop order creates a clean west-to-east flow from North America to Europe to East Asia, then closes the loop back in San Francisco.
As a business-class multi-stop ticket, this itinerary is built around a small number of long-haul transitions and a compact set of intermediate city pairs. October timing supports a three-week plan with distinct stays at each stop rather than quick same-region hops or overnight turnarounds.