Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Singapore to Nicaragua as you normally would.
For a flight from Singapore to Nicaragua, you will be flying from Changi. Singapore Changi (SIN) is just 16.9 km from the centre of the city.
This flight path from Singapore Changi to Nicaragua was viewed by 15 users in the past month. Keep an eye out for changes in search interest prior to high and low season.