Upvote:0
I would use an airport shuttle bus.
https://www.etsairportshuttle.com/jfk-to-newark
ETS Airport Shuttle provides the safest and most reliable car services between JFK and Newark airports. Our JFK to Newark Shuttles are guaranteed safe, affordable, and fast!
The cost is around $52 USD currently.
Upvote:6
CANCEL OR CHANGE THE RESERVATION
If any possible, cancel this reservation and book something else. Transfer from JFK to EWR is very cumbersome and unpredictable. The airports are over 50km apart and one of the worst traffic nightmares is between them. Transit time depends heavily on time of day traffic situations and other local factors which are hard to predict.
There are multiple options (train, bus, shuttle, taxi, ride share, limo) which you can google and compare for your specific departure and arrival times. Cost and reliability vary greatly and there is no single "good" option.
We tried to make the transfer once and booked a shuttle. Since it was Friday afternoon, the shuttle departure was delayed by more than two hours with no ETA so we decided to take a taxi. The taxi also got snagged in traffic: it took over two hours and we missed our flight anyway.
Instant Karma: the taxi driver was trying to price gouge us by insisting on a fixed fee instead of running the meter. Turns out the traffic was so bad, that in the end the final meter price was higher than the inflated fixed fee. He wanted to switch back to meter, but we had a photo of his badge and we refused.