This one's pretty straight forward: fly to Madrid nonstop from $225 round trip. Book these so you don't have to pay the normal price of $600 round trip!
Nonstop Madrid Flights Timeframe: 1. Sep. 2019 - 10. Mar. 2020
New York, Boston, Los Angeles
This deal was published more than a week ago. Therefore it is possible prices are not up to date or are no longer available.