Flight deal to Barcelona Under $400
Credit: Getty Images/Perspectives

Airfare to Europe is on sale again, with flights overseas costing as little as $333 round-trip. The Oneworld alliance sale, noted by the Airfare Spot, also includes trips to Italy, England, and France.

In October and November, for example, travelers can book a steeply discounted $333 round-trip flight from New York City to Barcelona with Brussels Airlines and United Airlines.

New York City-based fliers can also book a $390 round-trip flight to Rome between September and October.

And for $400 even, travelers can book round-trip airfare to Paris. For this route, the Airfare Spot found deals between September and November, though affordable seats can also be booked as soon as late April and the beginning of May.

Travelers willing to surpass $400 in airfare can also look to London, Milan, and Madrid. Currently, there are $405 seats from Newark Liberty International Airport to Madrid in November, and $457 flights to Milan between October and November.

And for Britain-bound vacationers, there are $413 non-stop flights from New York City to London scattered throughout September, October, and November, with seats on sale from the end of April until early May.

To take advantage of the sale, travelers must be able to depart from airports in the New York metro area: specifically John F. Kennedy and Newark Liberty International airports.