This is as good a time as any to book for April.
Do you have to go to SNN or is DUB ok? There is service to SNN but not as much as DUB, so you're limiting your options.
The more flexibility you have in dates and destinations the better.
Ask them to look at:
EWR-SNN on CO
EWR-ATL-SNN on DL (CO or DL for EWR-ATL)
LGA-ATL-SNN on DL
JFK-ATL-SNN on DL
EWR-DUB on CO
EWR-AMS-DUB on KL
JFK-AMS-DUB on KL
EWR-CDG-DUB on AF
JFK-CDG-DUB on AF
JFK-PRG-DUB on OK
And that's all non-stops or single connections, we haven't even looked at double connections yet.
As always use the phone and call.