Spring in Ireland means green hills, manageable crowds, and quiet pubs with a fire in the hearth. Late winter is the ideal time to lock in your flights and castle stays before summer rates hit.
A typical trip from the US runs about $2500 for flights, lodging, and a car. Spreading that cost over monthly payments helps you set up the trip now without draining your savings in one shot.
Keep in mind that an intro window is a firm deadline, not free money. If you carry a balance on your Citi Simplicity® Credit Card after the 18 months end, regular interest applies to whatever amount is left.