Leaving on a Wednesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 101% on the overall cost on flights from Philadelphia to St John's.
A simple way to save on the total cost of your ticket is to fly from Philadelphia to St John's at noon. If you’re flexible enough to do this you can expect to save up to 37% on your trip compared to booking a flight in the morning.