Ending today, Delta Air Lines via DealBase discounts Delta Air Lines Roundtrip Flights to Europe from select cities in the U.S., with prices starting from $516.56. (On the DealBase landing page, click on "Delta.com" in the main paragraph to see this sale.) That's the lowest price we could find for select routes by at least $6, although we saw similar fares for $161 less two weeks ago (since expired). This price is based on departure on May 30 from Boston, MA, (BOS) with arrival in London, England, (LHR) and return on June 6. A 28-day advance purchase is required. This sale includes flights to Rome, Italy, (FCO); Paris, France, (CDG); Amsterdam, Netherlands, (AMS); and more. Book this travel deal by today for travel from April 7 through May 11.

All prices, dates, and booking details were valid at the time of publication.