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Islip

Find cheap Southwest flights to Islip

RDU — ISP
Aug 26 — Sep 21
Wed 8/26
Wed 9/2
1 adult, Economy
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Find Southwest flight deals to Islip

Cheapest Southwest flights from USA to Islip
Explore the most affordable Southwest flight options available from USA to Islip. Find the lowest fares with prices last updated on July 27, 2026.

This Southwest deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/187:15 am
RDU
-
ISP
1 stop7h 40m
Southwest
Thu 8/204:05 pm
ISP
-
RDU
1 stop5h 55m
Southwest
Deal found 7/24$197
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:30 pm
RDU
-
ISP
1 stop3h 35m
Southwest
Sat 8/295:30 am
ISP
-
RDU
1 stop4h 00m
Southwest
Deal found 7/22$231
This Southwest deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:20 am
MCO
-
ISP
1 stop5h 50m
Southwest
Sat 8/2911:55 am
ISP
-
MCO
2 stops7h 30m
Southwest
Deal found 7/24$248

Flights to Islip with Southwest at a glance

Find detailed information about Southwest flights from USA to Islip. Explore the options provided by Southwest to plan your journey from USA to Islip. Data last updated July 27, 2026.

Popular in

July

Cheapest in

February

Average price

$341

Round-trip from

$197

One-way from

$99

Good one-way deal

$278 or less
Highest demand for flights to Islip with Southwest; 16% potential price increase.
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Best time to find cheap flights to Islip with Southwest; 2% potential price drop.
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Average price for flights to Islip with Southwest (round-trip).
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Southwest
  • Southwest
  • 9/9-9/14
  • 2 total stops
  • 9h 05m total
  • USA to Islip
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Southwest
  • Southwest
  • 9/12
  • 1 total stop
  • 3h 35m total
  • USA to Islip
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Price to beat on a one-way flight from the United States to Islip with Southwest.
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Cheapflights Insights

Find cheap Southwest flights to Islip

How long is the flight to Islip with Southwest?

On average, Southwest flights from the United States to Islip take 2 hours 19 minutes. Flights to Islip from other popular cities in the United States will vary in length. Below are a few examples of popular routes and their flight times.

Southwest weekly flight availability to Islip

The most flights to Islip operated by Southwest are scheduled on a Monday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (7 on average).

When is the best time to book a flight to Islip with Southwest?

The best time to book a flight to Islip with Southwest is 30 days before departure. On average, fares are higher if you book 49 days before departure.

When is the cheapest time to fly to Islip with Southwest?

Users looking for the cheapest Southwest fares to Islip should consider flying on Monday evenings, when prices are typically cheapest. Budget-minded travellers will want to avoid Sunday afternoons, when prices are usually at their highest.

FAQs about flights to Islip with Southwest

  • Which airport do Southwest flights arrive at when travelling to Islip?

    Southwest flights on this route tend to land at Islip Long Island Airport.

  • Is Southwest the cheapest airline for a flight to Islip?

    Flight prices will depend on many factors like date, time and cabin class so it is worth comparing flights before booking. Based on Cheapflights data the cheapest average return price for flights to Islip tends to be with Avelo Airlines.

  • Are there alternative airlines other than Southwest that fly to Islip?

    Frontier, JetBlue and Breeze Airways all fly to Islip and offer an alternative to Southwest.

  • How much is a flight to Islip with Southwest?

    The average price for a return flight with Southwest is $437; with a one-way flight around $263.

See more FAQs

Reviews of Southwest

See what Cheapflights users have to say about their Southwest experience.
Southwest
8.0
Very good
4,229 reviews
Overview

Food

7.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Comfort

8.0

Popular Southwest flights

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