The Delaware River and Bay lead from eastern PA to the Atlantic…..about a hundred miles from Philly.
The Susquehanna area drains into the Chesapeake and two hundred miles later the Atlantic.
West of the Alleghenies, rivers drain into the St Lawrence River , then the Atlantic in Canada; others drain into the Ohio which ends up in the Gulf of Mexico.
So your answer is The Atlantic, but not directly.
IN PA? There are no oceans IN PA. Once you get outside PA you can spread ashes over any ocean you want.
On this planet we have these things called maps , you see .
The Atlantic. No other oceans are available in PA.