Flights from Islip to Allentown lean towards being more expensive in December. Prices are generally better when you fly from Islip to Allentown in September, with the cheapest ticket starting at $68.
When flying from Islip to Allentown, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
While on average a flight from Islip to Allentown is generally $313, our data shows the cheapest flight currently is $313. When looking at the most popular route, (Islip Long Island - Allentown-Bethlehem), you can expect to pay $2,320 for that flight.