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

$88+ 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 8/13. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SJU
Jun 23 — Jun 301
Tue 6/23
Tue 6/30
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 April or January, booked 69 days in advance, depart on a Monday or Friday and return on a Thursday

Cheap 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 May 24, 2026.

This Frontier deal was found by Cheapflights users on 5/23. 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.
Sat 8/159:33 pm
MIA
-
SJU
Nonstop2h 55m
Frontier
Sun 8/167:30 am
SJU
-
MIA
Nonstop2h 45m
Frontier
Deal found 5/23$173
This Kiwi.com deal was found by Cheapflights users on 5/23. 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.
Tue 8/252:50 pm
MIA
-
SJU
Nonstop2h 46m
Frontier
Tue 9/86:41 pm
SJU
-
MIA
Nonstop2h 55m
Frontier
Deal found 5/23$176
This Super.com deal was found by Cheapflights users on 5/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/209:33 pm
MIA
-
SJU
Nonstop2h 42m
Frontier
Tue 6/237:30 am
SJU
-
MIA
Nonstop2h 51m
Frontier
Deal found 5/23$177
This Frontier deal was found by Cheapflights users on 5/22. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/159:33 pm
MIA
-
SJU
Nonstop2h 55m
Frontier
Mon 8/177:30 am
SJU
-
MIA
Nonstop2h 45m
Frontier
Deal found 5/22$178
This Frontier deal was found by Cheapflights users on 5/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/129:33 pm
MIA
-
SJU
Nonstop2h 55m
Frontier
Sat 8/226:41 pm
SJU
-
MIA
Nonstop2h 55m
Frontier
Deal found 5/24$179
This Frontier deal was found by Cheapflights users on 5/20. 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 10/269:28 pm
MIA
-
SJU
Nonstop2h 48m
Frontier
Mon 11/28:24 pm
SJU
-
MIA
Nonstop2h 51m
Frontier
Deal found 5/20$182
This Frontier deal was found by Cheapflights users on 5/20. 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 6/159:33 pm
MIA
-
SJU
Nonstop2h 42m
Frontier
Wed 6/247:30 am
SJU
-
MIA
Nonstop2h 51m
Frontier
Deal found 5/20$190
This Kiwi.com deal was found by Cheapflights users on 5/23. 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.
Sat 9/52:50 pm
MIA
-
SJU
Nonstop2h 46m
Frontier
Wed 9/99:05 pm
SJU
-
MIA
Nonstop2h 50m
Frontier
Deal found 5/23$192
This Frontier deal was found by Cheapflights users on 5/23. 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.
Tue 8/119:33 pm
MIA
-
SJU
Nonstop2h 55m
Frontier
Wed 8/127:30 am
SJU
-
MIA
Nonstop2h 45m
Frontier
Deal found 5/23$195
This Frontier deal was found by Cheapflights users on 5/20. 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.
Sat 10/109:28 pm
MIA
-
SJU
Nonstop2h 48m
Frontier
Wed 10/146:00 am
SJU
-
MIA
Nonstop2h 50m
Frontier
Deal found 5/20$197
This Super.com deal was found by Cheapflights users on 5/24. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/209:33 pm
MIA
-
SJU
Nonstop2h 42m
Frontier
Wed 6/247:30 am
SJU
-
MIA
Nonstop2h 51m
Frontier
Deal found 5/24$198
This Super.com deal was found by Cheapflights users on 5/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/209:33 pm
MIA
-
SJU
Nonstop2h 42m
Frontier
Thu 6/257:30 am
SJU
-
MIA
Nonstop2h 51m
Frontier
Deal found 5/23$199

Find 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 May 24, 2026.

Round-trip from

$173
(Frontier)

One-way from

$88
(Super.com)

Popular in

December

Cheapest in

April

Average price

$256
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. 1% potential increase in price ($5 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

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 May 24, 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 8/11

7:10 am-12:20 pm

1 stop5h 10m

San Juan Luis Munoz Marin Intl

Thu 8/27

6:00 am-4:25 pm

2 stops10h 25m

$278

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 7/1

10:40 am-10:29 pm

1 stop11h 49m

San Juan Luis Munoz Marin Intl

Mon 7/6

5:56 pm-12:51 am

1 stop6h 55m

$325

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 6/30

10:40 am-10:29 pm

1 stop11h 49m

San Juan Luis Munoz Marin Intl

Mon 7/6

5:56 pm-12:51 am

1 stop6h 55m

$335

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 8/20

6:20 am-4:55 pm

2 stops10h 35m

San Juan Luis Munoz Marin Intl

Sun 8/23

6:35 am-6:00 pm

2 stops11h 25m

$336

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 6/2

12:29 pm-8:38 pm

1 stop8h 09m

San Juan Luis Munoz Marin Intl

Sat 6/6

1:25 pm-11:22 pm

1 stop9h 57m

$438

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 6/30

1:45 pm-10:45 pm

1 stop9h 00m

San Juan Luis Munoz Marin Intl

Tue 7/7

5:30 am-3:50 pm

2 stops10h 20m

$443
Quickest round-trip

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Fri 6/12

5:25 am-10:45 am

1 stop5h 20m

San Juan Luis Munoz Marin Intl

Tue 6/16

7:00 am-3:50 pm

2 stops8h 50m

$476

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sun 7/5

5:35 am-10:45 am

1 stop5h 10m

San Juan Luis Munoz Marin Intl

Thu 7/9

11:35 am-10:35 pm

2 stops11h 00m

$476

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 7/8

1:45 pm-12:20 am

2 stops10h 35m

San Juan Luis Munoz Marin Intl

Mon 7/13

5:00 am-2:50 pm

2 stops9h 50m

$492

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 6/30

1:45 pm-12:15 am

2 stops10h 30m

San Juan Luis Munoz Marin Intl

Mon 7/6

1:15 pm-10:35 pm

2 stops9h 20m

$501

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/23

Showing 1-10 of 23 resultsSorted by cheapest first
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

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 May 24, 2026.

It’s typically best to fly out from Key Largo to San Juan Luis Munoz Marin Intl Airport in the afternoon. Doing so could potentially save you 17% on the flight price compared to flying in the morning, which is usually more expensive.

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 May 24, 2026.

The most flights from KE9 to SJU are scheduled on a Friday (18 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (16 on average).

How much does it cost to fly round-trip from Key Largo to San Juan Luis Munoz Marin Intl Airport?

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 May 23, 2026.

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

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 May 24, 2026.
Read reviews from past customers who have flown Delta,JetBlue, andAmerican Airlines 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.
Delta
7.9
Good
8,437 reviews

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Delta
7.9
Good
8,437 reviews
Delta
7.9
Good
8,437 reviews

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
JetBlue
7.2
Good
2,982 reviews
Delta
7.9
Good
8,437 reviews

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
American Airlines
7.1
Good
11,631 reviews
Delta
7.9
Good
8,437 reviews

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Spirit Airlines
6.2
Okay
Delta
7.9
Good
8,437 reviews

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Frontier
5.7
Fair
2,937 reviews
Delta
7.9
Good
8,437 reviews

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.

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, Delta, and United Airlines can get you from Key Largo to San Juan Luis Munoz Marin Intl Airport in just under 5h 10m. Your travel time can differ by up to 6h 39m. 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 cheapest airlines to fly from Key Largo to San Juan Luis Munoz Marin Intl Airport one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $58. However, be on the lookout for offers from Spirit Airlines and Southwest, as they are both options that can get you from Key Largo to San Juan Luis Munoz Marin Intl Airport for a low price.

  • 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: Royal Air Maroc (96%), British Airways (78%), Atlas Air( 76%).

  • 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 $62. While the most popular route (Miami - San Juan Luis Munoz Marin Intl) can be booked for $212 on average, our data indicates $511 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.

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
Fajardo
Luquillo
Rio Grande
Dorado
Humacao
Bayamón

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.

Top 6 airlines flying from Key Largo to Luis Munoz Marin Intl

Discover the top 6 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 May 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$81Average$217FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$83Average$204FlexibilityNo cancel feeOn-time65%
DeltaCheapest$108Average$108FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$125Average$302FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$189Average$312FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$229Average$453FlexibilityNo 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.