Our ceremony is happening at the Cliffs of Moher, which is in between the town of Doolin and Liscannor. Both of these towns have AirBnB's.
Whatever city you are coming from, you are going to find the most economical flights if you are flying from a larger hub city. For Americans, this would be flying from LAX, Chicago, or New York. Often it's less expensive to travel to a hub city and fly from there internationally than flying from smaller cities with less international capacity.
In my experience, the best time to purchase flights is around SIX WEEKS before travel. Often the price you see months away is the high target price, but will drop because there are too many seats available. I'd recommend studying flight cost patterns 6 weeks out and estimate cost based on that cost, not the cost of 4+ months out. Please contact Sydney if you want some advice on flights!