@DrFacilier
AwardHacker suggests flying
BA on Iberia Metal Direct BOS--MAD nonstop.
BA.com resulted nothing. So...
Pulling up Iberia.com, i plugged in those dates and it pops up 40k RT. Say I had to login which i dont have an account so i dont know what is available after that screen. (Iberia is a Chase Partner and will transfer 1:1 from UR points).
Other routes to consider is BOS-->JFK--> MAD (Iberia), BOS-->LHR-->MAD(BA/Iberia)
*A wise, SQ can save u 5k(UA is 5k more). Most likely easier to search on
United.
routes are BOS-->LIS-->MAD on TAP Portugal...
BOS-->EWR --> MAD on UA... I found this route at 30k one way. 60k RT.