These seem to be good prices for a return flight from London to Newark with a well known carrier
All taxes included, flight leaving this Thursday 4th Feb and returning Monday 8th Feb for less than £200.
Other dates prices fluctuate, following week £50 more, some dates in April £197.80.
Need to do a good search but they are in there at these prices.
I know friends who have paid nearly as much for a 400 mile round trip train ticket to London during peak times