As an example, I found this price departing New York JFK on Tuesday, October 29, returning from Brussels BRU on Tuesday, November 5.
Other dates are available for travel on Mondays, Tuesdays, Wednesdays, and Thursdays, starting in late October through the end of the booking schedule in February 2020. Peak holiday travel in late December and early January is blacked out. A Saturday night stay is required.
This Basic Economy fare includes a carry-on bag plus one personal item. A checked bag costs $60 each way.
Seats will be assigned at random upon check-in for this price.
For $180 more roundtrip, you can purchase Delta's Main Cabin Economy fare, which is $452 roundtrip on the nonstop route from New York. This fare type includes one free checked bag, advanced seat assignments, and allows ticket changes/upgrades for a fee.
For more deals to Europe, have a look at our Europe Flight Deals page.
Need a room in Brussels? Here's what's available for the above dates on Hotelwatchdog.