Delta Air Lines is comfortably the largest operator in Boston. The SkyTeam member is also number one for European flights. Cirium Diio data shows that it has just over a fifth of all such transatlantic services, rising to over half when only US carriers are considered (not that there's much competition).

In 2025, Delta has regular European flights from ten US hubs and airports, rising to 11 when its time-limited service from Las Vegas, for the Consumer Electronics Show, is included. Boston, which is the country's tenth-busiest airport for widebodies , ranks fourth, behind New York JFK, Atlanta, and Detroit, although it is third in some months.

Delta's 2 New European Routes Summarized

Next May, Delta will begin two additional European routes from Boston: Madrid (daily A3

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