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Luis Munoz Marin Intl

$64+ 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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SJU
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to San Juan Luis Munoz Marin Intl are usually found in February or April, 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

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 December 18, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 12/17. 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 12/253:38 pmMIA - SJU
Nonstop2h 35mSpirit Airlines
Fri 1/1611:52 amSJU - MIA
Nonstop2h 58mSpirit Airlines
Deal found 12/17$136
This Kiwi.com deal was found by Cheapflights users on 12/16. 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.
Fri 12/2611:05 pmMIA - SJU
Nonstop2h 34mFrontier
Sun 12/283:54 amSJU - MIA
Nonstop3h 06mFrontier
Deal found 12/16$145
This Frontier deal was found by Cheapflights users on 12/17. 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 12/265:05 amMIA - SJU
Nonstop2h 34mFrontier
Mon 1/125:45 amSJU - MIA
Nonstop3h 06mFrontier
Deal found 12/17$146
This Cheapflightsfares deal was found by Cheapflights users on 12/15. 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.
Thu 12/183:38 pmMIA - SJU
Nonstop2h 35mSpirit Airlines
Sun 12/2112:53 pmSJU - MIA
Nonstop2h 50mSpirit Airlines
Deal found 12/15$148
This Super.com deal was found by Cheapflights users on 12/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2911:05 pmMIA - SJU
Nonstop2h 34mFrontier
Tue 12/303:54 amSJU - MIA
Nonstop3h 06mFrontier
Deal found 12/16$154
This Priceline deal was found by Cheapflights users on 12/17. 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.
Sat 12/273:38 pmMIA - SJU
Nonstop2h 35mMultiple Airlines
Thu 1/154:35 pmSJU - MIA
1 stop9h 07mMultiple Airlines
Deal found 12/17$155
This Frontier deal was found by Cheapflights users on 12/17. 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 12/2711:05 pmMIA - SJU
Nonstop2h 34mFrontier
Sun 12/289:49 amSJU - MIA
Nonstop3h 00mFrontier
Deal found 12/17$157
This Super.com deal was found by Cheapflights users on 12/17. 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.
Wed 12/315:05 amMIA - SJU
Nonstop2h 34mFrontier
Thu 1/810:47 pmSJU - MIA
Nonstop3h 02mFrontier
Deal found 12/17$158
This Frontier deal was found by Cheapflights users on 12/17. 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 12/2611:05 pmMIA - SJU
Nonstop2h 34mFrontier
Sun 12/289:49 amSJU - MIA
Nonstop3h 00mFrontier
Deal found 12/17$162

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 December 18, 2025.

Round-trip from

$133
(Frontier)

One-way from

$64
(Super.com)

Popular in

December

Cheapest in

February

Average price

$317
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. 8% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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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 December 18, 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

Mon 1/26

11:26 am-3:06 pm

Nonstop2h 40m

San Juan Luis Munoz Marin Intl

Thu 1/29

4:22 pm-12:47 am

1 stop9h 25m

$141

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Fri 12/26

5:05 am-8:39 am

Nonstop2h 34m

San Juan Luis Munoz Marin Intl

Mon 1/12

5:45 am-7:51 am

Nonstop3h 06m

$146

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 1/8

9:01 am-12:35 pm

Nonstop2h 34m

San Juan Luis Munoz Marin Intl

Sun 1/11

11:52 am-1:50 pm

Nonstop2h 58m

$165

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 1/22

3:25 pm-11:45 pm

1 stop7h 20m

San Juan Luis Munoz Marin Intl

Tue 1/27

6:27 pm-12:51 am

1 stop7h 24m

$185

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sun 1/18

8:51 pm-3:35 pm

3 stops41h 44m

San Juan Luis Munoz Marin Intl

Mon 1/26

8:15 am-10:16 am

Nonstop3h 01m

$190

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 1/15

12:53 pm-11:40 pm

1 stop9h 47m

San Juan Luis Munoz Marin Intl

Mon 1/26

8:15 am-10:16 am

Nonstop3h 01m

$190

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sun 12/28

5:05 am-8:39 am

Nonstop2h 34m

San Juan Luis Munoz Marin Intl

Wed 12/31

2:44 pm-8:24 pm

1 stop30h 40m

$218

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 2/12

2:04 pm-1:37 am

1 stop10h 33m

San Juan Luis Munoz Marin Intl

Tue 2/17

2:59 am-12:57 pm

1 stop10h 58m

$224

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sat 3/7

6:55 am-9:00 pm

1 stop13h 05m

San Juan Luis Munoz Marin Intl

Tue 3/17

5:55 am-11:45 am

1 stop5h 50m

$232

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Fri 1/23

1:21 pm-11:45 pm

1 stop9h 24m

San Juan Luis Munoz Marin Intl

Mon 1/26

6:27 pm-12:51 am

1 stop7h 24m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 22 results
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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 December 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, February is the cheapest month in which you can book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport (average of $60). Flying from Key Largo to San Juan Luis Munoz Marin Intl Airport in September is currently the most expensive (average of $130). 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 December 18, 2025.

It’s typically best to fly out from Key Largo to San Juan Luis Munoz Marin Intl Airport in the evening. Doing so could potentially save you 26% on the flight price compared to flying in the afternoon, which is usually more expensive.

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 Wednesday mornings when fares are most often at their lowest. Sunday mornings 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 December 18, 2025.
Read reviews from past customers who have flown Delta, 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.
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.9

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
8,005 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.9

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
7.2
Good
11,054 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.9

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
2,897 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.9

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
6.3
Okay
8,190 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.9

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
5.8
Fair
3,081 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.9

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?

    Frontier and Delta can get you from Key Largo to San Juan Luis Munoz Marin Intl Airport in just under 2h 40m. Your travel time can differ by up to 4h 40m. 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 Spirit Airlines, with whom users have recently found tickets for as low as $40. However, be on the lookout for offers from Frontier and JetBlue, 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 (100%), British Airways (85%), Frontier( 82%).

  • 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 $95 on average, our data indicates $458 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, February is the cheapest month in which you can book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport (average of $60). Flying from Key Largo to San Juan Luis Munoz Marin Intl Airport in September is currently the most expensive (average of $130). 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
Humacao
Luquillo
Bayamón

Browse thousands of different options on Cheapflights for your next trip

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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.
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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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$65Average$177FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$74Average$192FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$93Average$251FlexibilityNo cancel feeOn-time62%
DeltaCheapest$108Average$328FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$180Average$313FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$222Average$420FlexibilityNo cancel feeOn-time71%

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