Route notes
Why this routing works
This 4-week multi-stop itinerary is structured around an open-jaw in the western Mediterranean: fly from Seattle into Bastia, make your own overland connection onward, then resume the ticket from Genoa for the return to Seattle. That setup works well when the ground segment is part of the plan and you do not need to backtrack to your arrival city.
Because Bastia is marked as reached overland before Genoa, the key logistics point is the gap between the inbound and outbound flight sectors. The ticket handles the long-haul positioning from Seattle and the onward return from Italy, while the Bastia-to-Genoa segment is left flexible on the ground. For a shorter trip length like 4 weeks, that can help keep the route direct without forcing a same-city return in Europe.
In economy, and at a sold range of USD 3,992 to 5,225, this is a straightforward multi-stop build rather than a round-the-world sequence. A September departure places the itinerary late in the jul-sep season window, which is useful for travelers comparing timing and fare bands across similar late-summer departures.