Originally Posted by
EnhancedByCO
Alternatively, you can see if they are willing switch your flight to an alternative European gateway (for example, Manchester or London). While you would need to make and pay for your own arrangements to get there from DUB (and risk a misconnect), you would at least be able to depart on the 19th.
If traveling on the 18th out of DUB doesn't work, this is the solution I'd seek. DUB-LHR/LGW are both pricing at $65 one-way on Dec 19th (early morning to allow you to connect with either US's LHR or LGW services). DUB-MAN is even cheaper at $60.