When flying from Singapore to Lehigh Valley, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
For a flight from Singapore to Lehigh Valley, you will be flying from Changi. Singapore Changi (SIN) is just 16.9 km from the centre of the city.
Great question - SIN to ABE just means Singapore Changi Airport to Allentown-Bethlehem Airport. Now you’ll know what these unique codes when you look for flights!