Cheap flights from Boston to Islip

One-way fares from $383 · BOS → ISP · prices found by travellers in the last 48 hours

Compare all dates Islip → Boston
Cheapest fare
$383

Frontier Airlines · Wed, Nov 4

Cheapest month
November

from $383

Direct flights
Not recently

Usually 1+ stop

Quickest trip
6h 20m

240 km

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Cheapest month to fly from Boston to Islip

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

  1. November 2026 Cheapest $383

Cheapest dates in November 2026

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

Frontier Airlines
Depart12:39 Wed, Nov 4BOS → ISP 6h 20m · 2 stops
$383one way, per person
View deal
See every date in November 2026 →

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Things to do

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Getting around

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About flights from Boston to Islip

Boston (BOS) and Islip (ISP) are about 240 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 6h 20m. Over the next few months, one-way fares start from $383, 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 Boston to Islip?

The cheapest one-way fare we've seen recently is $383 with Frontier Airlines, departing Wednesday, November 4, 2026.

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

November 2026 currently has the lowest fares, from $383 one way.

Are there direct flights from Boston to Islip?

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

How long is the flight from Boston to Islip?

The quickest journey we've seen takes about 6h 20m. Boston and Islip are around 240 km apart.

Which airlines fly from Boston to Islip?

Recent fares on this route were with Frontier Airlines.

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