Any good, inexpensive international airports from the US?

Back in 2018 there used to be a small airport in New York state called Stewart Airport. You could get a round to Ireland for $300. A lot of people found out about it though and now you can't really get a cheap flight with it again.

I'm thinking of doing a trip overseas, maybe to France, and I'm wondering if there's another hidden gem airport in the Northeast area of the US where I can find another good deal like that. Anyone know of any?

Thanks in advance