Boston to Porto

Porto usually costs well over $1,800 round trip from Providence, so seeing Delta at $599 is a standout, one of the deepest discounts we've tracked on this route. The fare is bookable across the fall and into winter, plenty of time to explore Portugal's historic riverside city, port wine cellars, and easy day trips to Lisbon or the Douro Valley. Delta on the metal also means a more comfortable long-haul experience than most budget carriers flying to Europe.