Delta primarily uses its wide-body aircraft on long-haul flights to Africa, Asia, Europe, Oceania, and South America. Its Airbus A330s, Boeing 767-300ERs, and Boeing 767-400ERs mainly operate on flights to Europe, while the Airbus A350-900 mainly operates on flights to Asia and Oceania.

In 2026, Delta Air Lines utilizes a modern and diverse widebody fleet for its international long-haul operations, primarily relying on aircraft from Airbus and Boeing. The flagship of their international fleet is the Airbus A350-900, which Delta has heavily invested in for high-demand transoceanic routes; they recently expanded their order book for the larger A350-1000 variant to serve even longer "ultra-long-haul" markets. Complementing the A350 is the Airbus A330-900neo, which offers exceptional fuel efficiency and range for transatlantic and South American flights. On the Boeing side, Delta continues to operate the Boeing 767-300ER and 767-400ER for medium-density international routes, although these are being phased out in favor of the newly ordered Boeing 787-10 Dreamliners. For shorter international hops, such as those to Mexico, the Caribbean, and Canada, Delta frequently uses its narrowbody workhorses, the Airbus A321neo and the Boeing 737-900ER, ensuring a premium cabin experience regardless of the distance.