Please be aware that New York has multiple airports and that these results are for all airports serving the city.
The best month to fly between New York and Amsterdam is February and the most expensive month to fly is January. (Average prices, based on 370 datapoints.)
The best day to arrive at New York is Monday and it would be best to avoid Friday, as prices are on average 64.26% higher than on Monday. (Average prices, based on 370 datapoints.)
The cheapest airline flying from New York to Amsterdam is JetBlue. They are 56% cheaper than United Airlines. (Average prices, based on 374 datapoints.)