NYC - Spain, $468 total on Air France (One month max stay)
 

Seems Air France has loaded an excellent fare to Europe for peak travel during July & August. For flights starting around July 15th and after, staying a maximum of one month, you should be able to find fares of about $468 all-in (meaning taxes & surcharges included) from NY JFK.

So far, airports the fare works for are MAD - Madrid & BCN - Barcelona. You can also structure it as an open-jaw, meaning you fly into Madrid and fly out of Barcelona.

Give it a shot if you're looking at airfares right now. Remember, as I've said in countless other posts... Book while it's hot because chances are, the fare will get pulled quickly! Strike while the iron is hot and enjoy your summer in Europe at winter flight prices! :)