Just in time for next summer.
Starting May 25, here will be nonstop service between Boston's Logan International Airport and Dublin Airport, and between New York City's John F. Kennedy International Airport and Lisbon Airport
There will also be nonstop service between JFK and Berlin's Tegel Airport.
European cities like Lisbon and Berlin have seen an increase in the number of tourists from the U.S., according to Henry Kuykendall, Delta’s vice president for New York.
Delta will operate Dublin and Lisbon flights with a Boeing 757-200, and Berlin flights with a Boeing 767-300.
Talia Avakian is a digital reporter at Travel + Leisure. Follow her on Twitter at @TaliaAvak.