HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Luis Munoz Marin Intl

$74+ Cheap flights from Key Largo, FL to Luis Munoz Marin Intl (SJU)

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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SJU
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Key Largo to Luis Munoz Marin Intl 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 Key Largo to San Juan Luis Munoz Marin Intl are usually found in October or February, booked 51 days in advance, depart on a Monday or Tuesday and return on a Friday

Cheap flight deals from Key Largo to Luis Munoz Marin Intl

Keep the following information in mind while searching for Key Largo to Luis Munoz Marin Intl flight deals. Data was last updated September 16, 2025.

Round-trip from

$145
(Kiwi.com)

One-way from

$74
(eDestinos)

Popular in

August

Cheapest in

October

Average price

$228
From Key Largo to San Juan Luis Munoz Marin Intl
Search Deals
One-way flight from Key Largo to San Juan Luis Munoz Marin Intl
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Key Largo to Luis Munoz Marin Intl

Cheapest flights from Key Largo to Luis Munoz Marin Intl
Explore the most affordable flight options available from Key Largo to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/165:13 pmMIA - SJU
Nonstop2h 43mFrontier
Sun 10/195:30 amSJU - MIA
Nonstop2h 48mFrontier
Deal found 9/15$145
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/205:13 pmMIA - SJU
Nonstop2h 43mFrontier
Tue 10/216:22 amSJU - MIA
2 stops12h 23mFrontier
Deal found 9/15$146
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/175:13 pmMIA - SJU
Nonstop2h 43mFrontier
Sun 10/195:30 amSJU - MIA
Nonstop2h 48mFrontier
Deal found 9/15$148
This Mytrip deal was found by Cheapflights users on 9/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/297:10 amMIA - SJU
Nonstop2h 42mFrontier
Fri 10/37:50 pmSJU - MIA
Nonstop2h 47mFrontier
Deal found 9/14$149
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/175:13 pmMIA - SJU
Nonstop2h 43mFrontier
Mon 11/39:30 amSJU - MIA
Nonstop2h 47mFrontier
Deal found 9/15$150
This eDestinos deal was found by Cheapflights users on 9/15. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/57:10 amMIA - SJU
Nonstop2h 42mFrontier
Sun 10/195:30 amSJU - MIA
Nonstop2h 48mFrontier
Deal found 9/15$153
This SmartFares deal was found by Cheapflights users on 9/15. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3010:45 pmMIA - SJU
Nonstop2h 47mFrontier
Thu 11/66:54 pmSJU - MIA
Nonstop2h 51mFrontier
Deal found 9/15$155
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/199:18 amMIA - SJU
Nonstop2h 43mFrontier
Mon 10/279:06 pmSJU - MIA
Nonstop2h 50mFrontier
Deal found 9/16$156
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/297:10 amMIA - SJU
Nonstop2h 42mFrontier
Thu 10/210:57 amSJU - MIA
Nonstop2h 53mFrontier
Deal found 9/14$157
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/118:59 pmMIA - SJU
Nonstop2h 38mFrontier
Thu 12/189:30 pmSJU - MIA
Nonstop3h 00mFrontier
Deal found 9/14$162
This Priceline deal was found by Cheapflights users on 9/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/57:10 amMIA - SJU
Nonstop2h 42mFrontier
Sun 10/125:30 amSJU - MIA
Nonstop2h 48mFrontier
Deal found 9/16$163

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to Luis Munoz Marin Intl 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 September 16, 2025.
Use the filters below to find and compare flights from Key Largo to San Juan Luis Munoz Marin Intl Airport that are best for you.

Fly from

Key Largo

Fly to

Luis Munoz Marin Intl

Route

Depart

Return

Price

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 10/21

11:45 am-10:45 pm

1 stop11h 00m

San Juan Luis Munoz Marin Intl

Fri 10/24

5:50 am-6:50 pm

1 stop13h 00m

$175

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 10/7

12:44 pm-12:29 am

2 stops11h 45m

San Juan Luis Munoz Marin Intl

Wed 10/8

6:22 am-6:45 pm

2 stops12h 23m

$239

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sat 11/15

8:15 am-11:15 pm

1 stop14h 00m

San Juan Luis Munoz Marin Intl

Tue 11/18

8:55 am-8:45 pm

2 stops12h 50m

$281

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 10/1

7:45 am-7:45 pm

2 stops12h 00m

San Juan Luis Munoz Marin Intl

Sat 10/4

5:45 am-8:30 pm

1 stop14h 45m

$281

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 9/25

6:05 am-6:45 pm

2 stops12h 40m

San Juan Luis Munoz Marin Intl

Thu 10/2

5:50 am-6:50 pm

1 stop13h 00m

$326

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 11/25

12:05 pm-1:25 am

1 stop12h 20m

San Juan Luis Munoz Marin Intl

Tue 12/2

8:55 am-8:45 pm

2 stops12h 50m

$332

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Mon 12/1

11:30 am-1:25 am

2 stops12h 55m

San Juan Luis Munoz Marin Intl

Mon 12/8

3:55 pm-9:50 pm

1 stop6h 55m

$340

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Fri 11/28

5:25 pm-12:35 am

1 stop6h 10m

San Juan Luis Munoz Marin Intl

Sun 12/7

7:40 am-11:50 am

1 stop5h 10m

$340

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 10/7

7:55 am-8:45 pm

2 stops12h 50m

San Juan Luis Munoz Marin Intl

Wed 10/8

5:05 am-12:15 pm

1 stop7h 10m

$348

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 11/12

1:30 pm-11:20 pm

1 stop8h 50m

San Juan Luis Munoz Marin Intl

Tue 11/25

6:35 am-6:00 pm

1 stop12h 25m

$353

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 21 results
1
2
3

Best time to book a flight from Key Largo to Luis Munoz Marin Intl

Have a flexible travel schedule? Discover the best time to fly to Luis Munoz Marin Intl from Key Largo 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 Key Largo to San Juan Luis Munoz Marin Intl Airport

How far ahead should I book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Luis Munoz Marin Intl. Price data was last updated on September 12, 2025.

Booking 51 days in advance of your planned departure date is, on average, the best time to get cheap flights from Key Largo to San Juan Luis Munoz Marin Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport?

Currently, September is the cheapest month in which you can book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport (average of $254). Flying from Key Largo to San Juan Luis Munoz Marin Intl Airport in June is currently the most expensive (average of $339). 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 KE9 to SJU?

Find hourly flight availability from Key Largo to Luis Munoz Marin Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

When flying from Key Largo to San Juan Luis Munoz Marin Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What is the cheapest day to fly from Key Largo to San Juan Luis Munoz Marin Intl Airport?

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

Travelers seeking maximum savings on their Key Largo to San Juan Luis Munoz Marin Intl Airport flight should consider departing on Monday evenings when fares are most often at their lowest. Wednesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Key Largo to San Juan Luis Munoz Marin Intl Airport

Explore weekly flight availability from Key Largo to Luis Munoz Marin Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 16, 2025.

The most flights from KE9 to SJU are scheduled on a Monday (17 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (10 on average).

Reviews of airlines servicing Luis Munoz Marin Intl

Get insights into the airlines that provide service to Luis Munoz Marin Intl. 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 Luis Munoz Marin Intl. Reviews last updated September 16, 2025.
Read reviews from past customers who have flown Southwest, American Airlines, and JetBlue from Key Largo to San Juan Luis Munoz Marin Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
JetBlue
7.2
Good
2,914 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Spirit Airlines
6.3
Okay
8,019 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,174 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

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

  • How long is the flight from Key Largo to San Juan Luis Munoz Marin Intl Airport?

    Southwest and Frontier can get you from Key Largo to San Juan Luis Munoz Marin Intl Airport in just under 11h. Your travel time can differ by up to 45m. The distance from Key Largo to San Juan Luis Munoz Marin Intl Airport is about 1044 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most reliable airlines from Key Largo to San Juan Luis Munoz Marin Intl Airport?

    Before booking your flight to San Juan Luis Munoz Marin Intl Airport from Key Largo, check out the most reliable airlines to get you to your destination on time: Atlas Air (92%), British Airways (71%), Iberia( 70%).

  • What are the cheapest flights from Key Largo to San Juan Luis Munoz Marin Intl Airport?

    Looking at all options, your cheapest flight can be booked for $65. While the most popular route (Miami - San Juan Luis Munoz Marin Intl) can be booked for $122 on average, our data indicates $317 when flying from Key Largo to San Juan Luis Munoz Marin Intl Airport.

  • Can I find deals for flights from Key Largo to Luis Munoz Marin Intl that include hotel bookings?

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

  • How can I find direct flights from Key Largo to Luis Munoz Marin Intl?

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

  • Can I find deals for business class flights from Key Largo to Luis Munoz Marin Intl?

    Yes. Cheapflights offers flight deals from Key Largo to Luis Munoz Marin Intl 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 Key Largo to San Juan Luis Munoz Marin Intl Airport?

    Currently, September is the cheapest month in which you can book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport (average of $254). Flying from Key Largo to San Juan Luis Munoz Marin Intl Airport in June is currently the most expensive (average of $339). 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

Traveling to a place near San Juan Luis Munoz Marin Intl Airport?

Book flights to San Juan Luis Munoz Marin Intl Airport if you plan to visit one of these locations
Dorado
Fajardo
Rio Grande
Luquillo
Humacao

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 Key Largo to Luis Munoz Marin Intl

See prices for flight routes from nearby airports that may be better suited for you.
Orlando to Luis Munoz Marin Intl flights
Fort Lauderdale to Luis Munoz Marin Intl flights
Tampa to Luis Munoz Marin Intl flights
Miami to Luis Munoz Marin Intl flights
Jacksonville to Luis Munoz Marin Intl flights
West Palm Beach to Luis Munoz Marin Intl flights
Pensacola to Luis Munoz Marin Intl flights
Fort Myers to Luis Munoz Marin Intl flights
Sarasota to Luis Munoz Marin Intl flights
Daytona Beach to Luis Munoz Marin Intl flights
Panama City to Luis Munoz Marin Intl flights
Valparaiso to Luis Munoz Marin Intl flights
Melbourne to Luis Munoz Marin Intl flights
Tallahassee to Luis Munoz Marin Intl flights
Gainesville to Luis Munoz Marin Intl flights
Orlando Sanford Intl to Luis Munoz Marin Intl flights
Key West to Luis Munoz Marin Intl flights

Top 5 airlines flying from Key Largo to Luis Munoz Marin Intl

Discover the top 5 airlines that operate flights from Key Largo to Luis Munoz Marin Intl. 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$51Average$152FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$63Average$183FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$99Average$242FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$180Average$323FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$207Average$416FlexibilityNo cancel feeOn-time71%

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.