HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Key Largo

$118+ Cheap flights from Islip, NY (ISP) to Key Largo, FL

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — MIA
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to Key Largo with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Islip Long Island to Key Largo are usually found in January or May, booked 86 days in advance, depart on a Tuesday or Thursday and return on a Thursday

Cheap flight deals from Islip to Key Largo

Keep the following information in mind while searching for Islip to Key Largo flight deals. Data was last updated julio 31, 2025.

Round-trip from

$235
(Southwest)

One-way from

$118
(Southwest)

Popular in

April

Cheapest in

January

Average price

$372
From Islip Long Island to Key Largo
Search Deals
One-way flight from Islip Long Island to Key Largo
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($16 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from Islip to Key Largo

Cheapest flights from Islip to Key Largo
Explore the most affordable flight options available from Islip to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 31, 2025.

This Southwest deal was found by Cheapflights users on 7/30. 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.
sáb. 9/63:40 pmISP - MIA
1 stop4h 55mSouthwest
mar. 9/95:05 pmMIA - ISP
1 stop5h 00mSouthwest
Deal found 7/30$235

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Key Largo that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated julio 31, 2025.
Use the filters below to find and compare flights from Islip to Key Largo that are best for you.

Fly from

Islip

Fly to

Key Largo

Route

Depart

Return

Price

IslipMiami

ISP - MIA

ISPMIA

Islip Long Island

sáb. 9/6

3:40 pm-8:35 pm

1 stop4h 55m

Miami

mar. 9/9

5:05 pm-10:05 pm

1 stop5h 00m

$235

IslipMiami

ISP - MIA

ISPMIA

Islip Long Island

jue. 10/9

8:48 pm-5:58 pm

2 stops21h 10m

Miami

lun. 10/13

5:45 am-7:53 pm

2 stops14h 08m

$576

IslipMiami

ISP - MIA

ISPMIA

Islip Long Island

mar. 10/28

6:00 am-10:55 am

1 stop4h 55m

$118

IslipMiami

ISP - MIA

ISPMIA

Islip Long Island

mié. 8/6

4:45 pm-8:39 pm

2 stops27h 54m

$201

IslipMiami

ISP - MIA

ISPMIA

Islip Long Island

dom. 10/5

2:19 pm-8:59 am

3 stops18h 40m

$251

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Best time to book a flight from Islip to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo from Islip with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Islip to Key Largo

How far ahead should I book a flight from Islip, New York to Key Largo?

Use this chart to determine the optimal time to book a round-trip flight from Islip to Key Largo. Price data was last updated on July 25, 2025.

The best time to book flights from Islip, New York to Key Largo is 86 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Islip, New York to Key Largo?

Currently, September is the cheapest month in which you can book a flight from Islip, New York to Key Largo (average of $232). Flying from Islip, New York to Key Largo in March is currently the most expensive (average of $289). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ISP to KE9?

Find hourly flight availability from Islip to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated julio 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Islip, New York to Key Largo as you normally would.

What is the cheapest day to fly from Islip, New York to Key Largo?

Use this chart to determine the cheapest time to fly round-trip from Islip to Key Largo. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Islip, New York to Key Largo flight should consider departing on Monday at noon when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Islip, New York to Key Largo?

Reviews of airlines servicing Key Largo

Get insights into the airlines that provide service to Key Largo. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Key Largo. Reviews last updated julio 31, 2025.
Peruse reviews from past customers who have flown with Southwest and Frontier from Islip to Key Largo to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Frontier
5.9
Fair
3,239 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Related info for your journey

Find useful and relevant information for your journey from Islip to Key Largo. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Islip to Key Largo?

    For a flight from Islip to Key Largo, you will be flying from Long Island. Islip Long Island (ISP) is just 7.2 mi from the center of the city. Long Island is the only Islip airport and it handles 0 outbound flights to Key Largo per day. 5 airlines have flights to Key Largo from Islip Long Island on a regular basis.

  • How popular is this Islip, New York to Key Largo flight route?

    This flight path from Islip Long Island to Key Largo was viewed by 2 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest flights from Islip, New York to Key Largo?

    While on average a flight from Islip, New York to Key Largo is generally $463, our data shows the cheapest flight currently is $148. When looking at the most popular route, (Islip Long Island - Miami), you can expect to pay $235 for that flight.

  • Can I find deals for flights from Islip to Key Largo that include hotel bookings?

    Yes. In addition to deals on Islip to Key Largo flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Key Largo?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Key Largo.

  • Can I find deals for business class flights from Islip to Key Largo?

    Yes. Cheapflights offers flight deals from Islip to Key Largo by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Islip, New York to Key Largo?

    Currently, September is the cheapest month in which you can book a flight from Islip, New York to Key Largo (average of $232). Flying from Islip, New York to Key Largo in March is currently the most expensive (average of $289). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Islip to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
Newark to Fort Lauderdale flights
LaGuardia to Fort Lauderdale flights
John F Kennedy Intl to Orlando flights
John F Kennedy Intl to Miami flights
Newark to Orlando flights
Newark to Miami flights
LaGuardia to Miami flights
John F Kennedy Intl to Fort Lauderdale flights
LaGuardia to Orlando flights
John F Kennedy Intl to West Palm Beach flights
Newark to Tampa flights
John F Kennedy Intl to Tampa flights
White Plains to Orlando flights
LaGuardia to West Palm Beach flights
LaGuardia to Tampa flights
Newark to West Palm Beach flights
Islip to Orlando flights
Newark to Jacksonville flights
Newark to Fort Myers flights
LaGuardia to Fort Myers flights
John F Kennedy Intl to Fort Myers flights
John F Kennedy Intl to Jacksonville flights
Stewart to Orlando flights
Newark to Sarasota flights
Albany to Orlando flights
White Plains to Fort Lauderdale flights
Buffalo to Orlando flights
Newark to Key West flights
Buffalo to Fort Lauderdale flights
LaGuardia to Jacksonville flights
John F Kennedy Intl to Sarasota flights
Stewart to Fort Lauderdale flights
Syracuse to Orlando flights
Rochester to Orlando flights
White Plains to Miami flights
Islip to Fort Lauderdale flights
Newark to Orlando Sanford Intl flights
White Plains to West Palm Beach flights
John F Kennedy Intl to Key West flights
LaGuardia to Sarasota flights
White Plains to Daytona Beach flights
LaGuardia to Key West flights
Stewart to Tampa flights
Buffalo to Miami flights
Islip to West Palm Beach flights
Newark to St Petersburg flights
White Plains to Tampa flights
Islip to Tampa flights
Rochester to Miami flights
LaGuardia to Pensacola flights

Top 5 airlines flying from Islip to Key Largo

Discover the top 5 airlines that operate flights from Islip to Key Largo. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$45Average$162FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$60Average$176FlexibilityNo cancel feeOn-time65%
DeltaCheapest$98Average$327FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$108Average$297FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$231Average$413FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.