Originally Posted by
channa
Fares out of JFK tend to be cheaper than EWR. There are always exceptions, but there's a lot more domestic/lower-fare competition out of JFK.
In my experience, this has not been the case.
In most cases, I find that fares are pretty much the same, that EWR and JFK largely act as one marketplace.
Obviously, there are exceptions on given routes and given dates, but I find it can go either way.
The only real price difference that I have found consistently over time are CO's discounted BF fares, on which it is possible to fly CO J for approximately one-third the cost of DL's BE.