This is a great fare price to Europe while the weather is still lovely and the crowds have died down. Departures from New York are available from Sundays through Wednesdays, and returns from Dublin are valid Tuesday through Fridays. There is a 7-night minimum stay required to book this fare at the listed price point. Note that Delta books into Basic Economy, meaning no checked baggage included with the airline.
While searching on Google Flights, I was sent over to the Finnair website to book this route but it's operated on American Airlines metal. Seats can be found departing JFK Sunday, August 19, and returning from DUB on Wednesday, August 29, 2018.
Need a room in Dublin? Here's what's available for the mentioned dates above on Hotelwatchdog.