The cheapest time to book flights from Ireland depends on various factors such as seasonality, demand, and how early you book. Typically, the best time to book flights is during the off-peak seasons, which tend to be mid-week in January, February, and November. By booking at least 2-3 months in advance, you’ll have a higher chance of securing the best deals on your flight. Additionally, the best time to travel tends to be outside school holidays and major public holidays, as these periods tend to see higher ticket prices. For those searching for cheap flights, being flexible with your dates can help you take advantage of discounts and promotions.