Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Singapore to Limerick as you normally would.
For a flight from Singapore to Limerick, you will be flying from Changi. Singapore Changi (SIN) is just 16.9 km from the centre of the city. Changi is the only Singapore airport and it handles 0 outbound flights to Limerick per day. 1 airline has flights to Limerick from Singapore Changi on a regular basis.
This flight path from Singapore Changi to Limerick was viewed by 11 users in the past month. Keep an eye out for changes in search interest prior to high and low season.