What is the cheapest month to fly from Philadelphia to Islip?

Based on current 6-month forward fare data, May 2026 is the cheapest month to fly from Philadelphia (PHL) to Islip (ISP), with fares starting from $250.

What is the lowest current fare from PHL to ISP?

The lowest currently-listed fare from Philadelphia (PHL) to Islip (ISP) is $250 on 2026-05-28.

Is there a direct flight from Philadelphia to Islip?

There is currently no non-stop service from PHL to ISP. Most travellers connect through a hub airport. See our route page for current stopover options.

Cheap flights from Philadelphia to Islip

Cheapest current fares: $250 in May 2026 on connecting flights.

Last updated May 24, 2026 · By Flightmaps Editorial

Cheapest month-by-month fares

Lowest available fare per calendar month from Philadelphia (PHL) to Islip (ISP). Refreshed daily.

Philadelphia (PHL) → Islip (ISP)

May 2026 $250

Frequently asked questions

What is the cheapest month to fly from Philadelphia to Islip?

Based on current 6-month forward fare data, May 2026 is the cheapest month to fly from Philadelphia (PHL) to Islip (ISP), with fares starting from $250.
What is the lowest current fare from PHL to ISP?

The lowest currently-listed fare from Philadelphia (PHL) to Islip (ISP) is $250 on 2026-05-28.
Is there a direct flight from Philadelphia to Islip?

There is currently no non-stop service from PHL to ISP. Most travellers connect through a hub airport. See our route page for current stopover options.

Related guides for this route

Sibling pages — full route detail, airport overviews, visa context, per-airline routes.