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One World Alliance members (Iberia Airlines, Finnair, American Airlines, British Airways, KLM, etc) have roundtrip airfares from Miami FL (MIA) to Spain for $ 481 including taxes and carrier imposed fees. Nonstop service.
To Madrid (MAD) $ 481
Departs: Jan 9 – April 6 (wide availability)
To Barcelona (BCN) – $ 477
Departs: Jan – April (scattered dates, check google flights [google.com])
Use those dates and book it with Expedia [expedia.com]