Searching on Delta.com, I found flights departing BOS on Friday, July 20, and returning from PDL on Saturday, July 28, 2018. Travel is available on most days of the week except for Tuesdays and Thursdays. This fare books into Basic Economy, meaning that there is no checked baggage included in this price, just a standard sized carry-on allowed. If you want those checked bags and to bump up a few rows toward the front of the plane, Premium Economy is also available for a reasonable $678 round-trip, or Main Cabin economy is available for $500 round-trip.
We are seeing a lot of great deals out of Logan today, so make sure to have a peek at the Boston (BOS) flight deals page for a complete list of finds.
If you need a place to stay on the island of Sao Miguel, here's what is available for the mentioned dates on Hotelwatchdog.