One World Alliance member airlines (American, British, Iberia, Finnair) have roundtrip airfares travelling from Boston (BOS) to Madrid (MAD) for $380 RT including taxes and fees. This is nonstop service.
Departs BOS: Every Mon, Thurs & Sun beginning Oct 30 thru Dec 7th
Returns BOS: Every Mon, Thurs & Sun beginning Nov 6 thru Dec 14
Use those dates and plug into Priceline , Orbitz , CheapOAir or Expedia to see which airline is flying on your choice of dates.
My sample travel dates: Oct 30-Nov 6
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