Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Philadelphia to Palau as you normally would.
In terms of precipitation, rainfall in Palau ranges from 8.2 - 18.1 inches per month. July is typically the wettest month, when rainfall can reach 18.1 in. April is typically the driest time to visit Palau when rainfall is around 8.2 in.
If weather is an important factor for your trip to Palau, use this chart to help with planning. For those seeking warmer temperatures, March is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 80.6 F).