Route notes
Why this routing works
This route is structured as a straightforward westbound-to-eastbound Europe sequence from San Francisco to Madrid, then Paris, then Amsterdam, before returning to San Francisco. The stop order keeps the trip linear within Europe rather than backtracking between cities, which is typically the main advantage of booking it as a multi-stop ticket instead of separate round-trips.
Timing is distributed unevenly by design, with Madrid as the anchor stop and shorter stays in Paris and Amsterdam. That keeps the later segments shorter, which can work well for travelers who want one longer base with two additional city stays before flying home.
For a 3-week trip, that combination of open-jaw style progression and a single ticketed sequence is the core logistical value of the route.
Because the trip begins and ends in San Francisco, the long-haul transatlantic flying is consolidated into the outbound to Spain and the return from the Netherlands. The middle flights are kept inside Europe, which simplifies the overall structure and makes the route easy to understand at a glance when comparing timing, stop length, and total ticket cost.