Route notes
Why this routing works
This itinerary is structured as a one-direction transatlantic sequence with domestic positioning on both ends: San Luis Obispo to Seattle, onward to Reykjavik, then an open-jaw segment that resumes in Paris after an overland transfer. From there, the ticket continues south to Barcelona, then northwest to Dublin, and returns to the US via Seattle before the final leg back to San Luis Obispo.
Using Reykjavik as the transatlantic arrival point and Paris as the next ticketed departure creates a built-in surface sector, which can help separate the northern Europe arrival from the onward continental routing. After that, the order of Paris, Barcelona, and Dublin keeps the remaining flights in a clear progression before the return across the Atlantic.
At 4 weeks in economy, this is a compact multi-stop itinerary that fits several European stops without requiring backtracking to the original arrival city. The July departure window places the trip in the jul-sep season, and the sold price range for this routing was USD 1,666 to USD 2,542.