Please be aware that New York has multiple airports and that these results are only for John F Kennedy International airport.
The best month to arrive at New York is October and the most expensive month to fly is August. (Average prices, based on 696 datapoints.)
The best day to arrive at New York is Friday and it would be best to avoid Thursday, as prices are on average 25.86% higher than on Friday. (Average prices, based on 321 datapoints.)
The cheapest airline flying to New York is JetBlue. They are 84% cheaper than KLM. (Average prices, based on 721 datapoints.)