Cheap flights from Harrisburg to Islip

One-way fares from $355 · HAR → ISP · prices found by travellers in the last 48 hours

Compare all dates Islip → Harrisburg
Cheapest fare
$355

Allegiant Air · Sun, Nov 8

Cheapest month
November

from $355

Direct flights
Not recently

Usually 1+ stop

Quickest trip
7h 34m

320 km

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Cheapest month to fly from Harrisburg to Islip

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. November 2026 Cheapest $355

Cheapest dates in November 2026

The lowest fares we've seen for each day, cheapest first.

Allegiant Air
Depart22:02 Sun, Nov 8MDT → ISP 7h 34m · 2 stops
$355one way, per person
View deal
See every date in November 2026 →

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Where to stay, what to do and getting around, from our travel partners.

Where to stay

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Things to do

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Getting around

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About flights from Harrisburg to Islip

Harrisburg (HAR) and Islip (ISP) are about 320 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 7h 34m. Over the next few months, one-way fares start from $355, and November 2026 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from Harrisburg to Islip?

The cheapest one-way fare we've seen recently is $355 with Allegiant Air, departing Sunday, November 8, 2026.

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

November 2026 currently has the lowest fares, from $355 one way.

Are there direct flights from Harrisburg to Islip?

We haven't seen direct fares recently, so most journeys include at least one stop.

How long is the flight from Harrisburg to Islip?

The quickest journey we've seen takes about 7h 34m. Harrisburg and Islip are around 320 km apart.

Which airlines fly from Harrisburg to Islip?

Recent fares on this route were with Allegiant Air.

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