Easton is just off Interstate 78, exit 75, 70 miles west of New York City (about 1h 20m by car), 60 miles north of Philadelphia, and 5 miles east of Allentown / Bethlehem. The cross-river bridge from Phillipsburg, New Jersey, lands you within walking distance of Centre Square.
There is no passenger rail. Lehigh Valley International Airport (ABE) is around 20 minutes west and has limited service — mainly to Florida, Detroit, and the New York hubs. Most fly-in visitors use Newark Liberty (EWR) instead, roughly 70 minutes away by car or via the connecting Trans-Bridge Lines coach, which runs from Easton's intermodal terminal direct to the Port Authority and to Newark Airport several times daily.