If you want a cheap flight from Portland Maine to New York, you've got one airlines to choose from.
New York John F Kennedy Airport is just one of the airports in New York. If you're not set on a specific airport, try changing your search from New York John F Kennedy Airport to New York to see a broader range of flights – they might be cheaper. It usually takes about 1 hrs 20 mins to fly 440 km to New York John F Kennedy Airport.
There are about four flights to or via New York every week, so you have plenty of options. Keep your eye out for flights
If you're planning on going to New York during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.