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$80+ Cheap flights from Key Largo, FL to San Juan

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 11/13. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SJU
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to San Juan are usually found in February or April, booked 51 days in advance, depart on a Monday or Tuesday and return on a Friday

Find flight deals from Key Largo to San Juan

Cheapest flights from Key Largo to San Juan
Explore the most affordable flight options available from Key Largo to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 3, 2025.

This Priceline deal was found by Cheapflights users on 11/1. 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.
Thu 11/201:44 pmMIA - SJU
Nonstop2h 37mMultiple Airlines
Mon 11/249:30 pmSJU - MIA
Nonstop2h 55mMultiple Airlines
Deal found 11/1$152
This Kiwi.com deal was found by Cheapflights users on 11/1. 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 11/258:30 amMIA - SJU
Nonstop2h 37mMultiple Airlines
Sat 11/298:00 amSJU - MIA
Nonstop2h 50mMultiple Airlines
Deal found 11/1$154
This Frontier deal was found by Cheapflights users on 11/1. 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 12/127:00 amMIA - SJU
Nonstop2h 32mFrontier
Mon 12/1510:42 amSJU - MIA
Nonstop3h 00mFrontier
Deal found 11/1$155
This Priceline deal was found by Cheapflights users on 11/1. 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.
Fri 11/216:11 pmMIA - SJU
Nonstop2h 39mMultiple Airlines
Mon 11/243:23 pmSJU - MIA
Nonstop2h 53mMultiple Airlines
Deal found 11/1$156
This Kiwi.com deal was found by Cheapflights users on 11/1. 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 11/225:44 amMIA - SJU
Nonstop2h 43mMultiple Airlines
Tue 11/258:00 amSJU - MIA
Nonstop2h 50mMultiple Airlines
Deal found 11/1$157
This Kiwi.com deal was found by Cheapflights users on 11/1. 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 11/225:44 amMIA - SJU
Nonstop2h 43mMultiple Airlines
Fri 11/288:00 amSJU - MIA
Nonstop2h 50mMultiple Airlines
Deal found 11/1$158
This CheapOair deal was found by Cheapflights users on 11/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/225:44 amMIA - SJU
Nonstop2h 43mFrontier
Thu 11/279:30 pmSJU - MIA
Nonstop2h 55mFrontier
Deal found 11/2$159
This Kiwi.com deal was found by Cheapflights users on 11/1. 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 11/1412:27 pmMIA - SJU
Nonstop2h 43mFrontier
Fri 11/219:54 pmSJU - MIA
1 stop23h 55mFrontier
Deal found 11/1$160
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 11/2110:26 amMIA - SJU
Nonstop2h 47mMultiple Airlines
Tue 11/258:00 amSJU - MIA
Nonstop2h 50mMultiple Airlines
Deal found 11/2$161
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 12/46:00 amMIA - SJU
Nonstop2h 37mMultiple Airlines
Fri 12/54:10 amSJU - MIA
2 stops17h 37mMultiple Airlines
Deal found 11/2$162
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 12/46:00 amMIA - SJU
Nonstop2h 37mFrontier
Sat 12/64:31 pmSJU - MIA
2 stops27h 38mFrontier
Deal found 11/2$163
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 11/156:35 pmMIA - SJU
2 stops21h 44mMultiple Airlines
Sat 11/229:30 pmSJU - MIA
Nonstop2h 55mMultiple Airlines
Deal found 11/2$164

Cheap flight deals from Key Largo to San Juan

Keep the following information in mind while searching for Key Largo to San Juan flight deals. Data was last updated November 3, 2025.

Round-trip from

$152
(Mytrip)

One-way from

$80
(Kiwi.com)

Popular in

September

Cheapest in

February

Average price

$201
From Key Largo to San Juan
Search Deals
One-way flight from Key Largo to San Juan
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($38 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to San Juan 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 November 3, 2025.
Use the filters below to find and compare flights from Key Largo to San Juan that are best for you.

Fly from

Key Largo

Fly to

San Juan

Route

Depart

Return

Price

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Mon 1/12

10:05 pm-1:42 am

Nonstop2h 37m

San Juan Luis Munoz Marin Intl

Wed 1/21

7:10 am-10:58 am

2 stops28h 48m

$220

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Mon 11/17

5:15 pm-12:35 am

1 stop6h 20m

San Juan Luis Munoz Marin Intl

Thu 11/20

3:55 pm-9:50 pm

1 stop6h 55m

$228

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Fri 12/26

11:05 pm-2:39 am

Nonstop2h 34m

San Juan Luis Munoz Marin Intl

Wed 12/31

3:54 am-6:00 am

Nonstop3h 06m

$232

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 12/2

1:30 pm-12:35 am

2 stops10h 05m

San Juan Luis Munoz Marin Intl

Tue 12/9

5:45 am-4:15 pm

2 stops11h 30m

$234

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sat 11/8

11:55 am-11:15 pm

2 stops10h 20m

San Juan Luis Munoz Marin Intl

Sat 11/15

8:50 am-4:30 pm

1 stop8h 40m

$234

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 11/11

1:30 pm-11:20 pm

1 stop8h 50m

San Juan Luis Munoz Marin Intl

Sat 11/15

8:50 am-4:30 pm

1 stop8h 40m

$234

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sat 11/8

11:55 am-11:00 pm

1 stop10h 05m

San Juan Luis Munoz Marin Intl

Tue 11/11

11:20 am-9:50 pm

1 stop11h 30m

$259

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 11/18

7:40 am-6:35 pm

2 stops9h 55m

San Juan Luis Munoz Marin Intl

Sat 11/22

5:35 pm-12:25 am

1 stop7h 50m

$259

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Fri 11/14

12:27 pm-4:10 pm

Nonstop2h 43m

$80

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 11/20

5:15 pm-12:35 am

1 stop6h 20m

$99

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 18 results
1
2

Best time to book a flight from Key Largo to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan 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

How far ahead should I book a flight from Key Largo to San Juan?

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to San Juan. Price data was last updated on October 31, 2025.

The price you pay for your flight from Key Largo to San Juan may vary depending on when you book. For the best chance of a lower fare, look to book 51 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Key Largo to San Juan?

Currently, October is the cheapest month in which you can book a flight from Key Largo to San Juan (average of $50). Flying from Key Largo to San Juan 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 San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 3, 2025.

It’s typically best to fly out from Key Largo to San Juan in the evening. Doing so could potentially save you 45% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Key Largo to San Juan?

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

Travelers seeking maximum savings on their Key Largo to San Juan flight should consider departing on Sunday evenings when fares are most often at their lowest. Thursday at noon 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

Explore weekly flight availability from Key Largo to San Juan. 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 November 3, 2025.

The most flights from KE9 to PR1 are scheduled on a Sunday (18 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (7 on average).

Reviews of airlines servicing San Juan

Get insights into the airlines that provide service to San Juan. 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 San Juan. Reviews last updated November 3, 2025.
Read through reviews of airlines operating flights from Key Largo to San Juan, such as Delta, American Airlines, and JetBlue. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,001 reviews

Crew

8.5

Overall

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

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
8,001 reviews
Delta
7.9
Good
8,001 reviews

Crew

8.5

Overall

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

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
11,034 reviews
Delta
7.9
Good
8,001 reviews

Crew

8.5

Overall

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

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
2,907 reviews
Delta
7.9
Good
8,001 reviews

Crew

8.5

Overall

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

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
8,120 reviews
Delta
7.9
Good
8,001 reviews

Crew

8.5

Overall

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

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
3,118 reviews
Delta
7.9
Good
8,001 reviews

Crew

8.5

Overall

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

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 San Juan. 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?

    Departing from Key Largo to San Juan will take you 2h 37m. The distance from Key Largo to San Juan is about 1044 mi. This flight may include one or multiple stops.

  • What are the most reliable airlines from Key Largo to San Juan?

    The top 3 most reliable airlines when flying from Key Largo to San Juan are Frontier (85%), British Airways (81%) and American Airlines (73%).

  • What are the cheapest flights from Key Largo to San Juan?

    Looking for the cheapest flight from Key Largo to San Juan? While on average our users pay $415, our data indicates the cheapest price to be $86. The most popular route (Miami - San Juan Luis Munoz Marin Intl), is priced around $96.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Key Largo to San Juan 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?

    Currently, October is the cheapest month in which you can book a flight from Key Largo to San Juan (average of $50). Flying from Key Largo to San Juan 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.

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Top 6 airlines flying from Key Largo to San Juan

Discover the top 6 airlines that operate flights from Key Largo to San Juan. 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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$59Average$168FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$73Average$189FlexibilityNo cancel feeOn-time65%
DeltaCheapest$108Average$358FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$128Average$263FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$180Average$307FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$215Average$419FlexibilityNo cancel feeOn-time71%

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