Here are some prices for flights around the time you requested. I don't know how long you plan to stay for, though.
Taxes are included.
BOS to MAD (May 28-Jun 6) $677
BOS to MAD (May 21-May 30) $706.82
BOS to MAD (May 14-May 23) $670.60
I am also currently looking into a new travel service, BestFares.com. If anyone has any information on this service, please let me know. The fares seem alot cheaper, but I'm not sure if there is a catch or not.
I think there is a world market for maybe five computers.
- Thomas Watson (1874-1956), Chairman of IBM, 1943
"The more I meet new people, the more I like my dog."
Be happy while you're living, for you're a long time dead.
- Scottish Proverb