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$80+ Cheap flights from Key Largo, FL to Puerto Rico

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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SJU
nov. 29 — déc. 61
sam. 11/29
sam. 12/6
1 adult, Economy
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Cheap flight deals from Key Largo to Puerto Rico

Keep the following information in mind while searching for Key Largo to Puerto Rico flight deals. Data was last updated octobre 30, 2025.

Round-trip from

$151
(Frontier)

One-way from

$80
(Kiwi.com)

Popular in

September

Cheapest in

February

Average price

$205
From Key Largo to Puerto Rico
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One-way flight from Key Largo to Puerto Rico
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Highest demand for flights based on searches. 14% potential increase in price ($39 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Key Largo to Puerto Rico

Cheapest flights from Key Largo to Puerto Rico
Explore the most affordable flight options available from Key Largo to Puerto Rico. Find the lowest fares from popular airlines and budget airlines, with prices last updated on octobre 30, 2025.

This Frontier deal was found by Cheapflights users on 10/28. 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.
lun. 11/246:00 amMIA - SJU
Nonstop2h 40mFrontier
jeu. 11/279:30 pmSJU - MIA
Nonstop2h 55mFrontier
Deal found 10/28$151
This Priceline deal was found by Cheapflights users on 10/28. 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.
ven. 11/79:45 pmMIA - SJU
Nonstop2h 47mFrontier
dim. 11/99:45 amSJU - MIA
Nonstop2h 47mFrontier
Deal found 10/28$152
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
ven. 12/124:10 pmMIA - SJU
Nonstop2h 40mMultiple Airlines
jeu. 12/183:54 amSJU - MIA
Nonstop3h 06mMultiple Airlines
Deal found 10/29$153
This Frontier deal was found by Cheapflights users on 10/28. 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.
lun. 11/1712:27 pmMIA - SJU
Nonstop2h 43mFrontier
ven. 11/289:30 pmSJU - MIA
Nonstop2h 55mFrontier
Deal found 10/28$154
This Frontier deal was found by Cheapflights users on 10/28. 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.
ven. 11/149:45 pmMIA - SJU
Nonstop2h 47mFrontier
jeu. 11/279:30 pmSJU - MIA
Nonstop2h 55mFrontier
Deal found 10/28$156
This Frontier deal was found by Cheapflights users on 10/28. 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.
lun. 11/1712:27 pmMIA - SJU
Nonstop2h 43mFrontier
dim. 11/239:30 pmSJU - MIA
Nonstop2h 55mFrontier
Deal found 10/28$157
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
lun. 11/246:00 amMIA - SJU
Nonstop2h 40mMultiple Airlines
mar. 12/28:00 amSJU - MIA
Nonstop2h 50mMultiple Airlines
Deal found 10/28$158
This Priceline deal was found by Cheapflights users on 10/29. 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.
ven. 10/311:27 pmMIA - SJU
Nonstop2h 43mFrontier
jeu. 11/66:54 pmSJU - MIA
Nonstop2h 51mFrontier
Deal found 10/29$159
This CheapOair deal was found by Cheapflights users on 10/29. 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.
ven. 10/311:27 pmMIA - SJU
Nonstop2h 43mFrontier
dim. 11/29:45 amSJU - MIA
Nonstop2h 47mFrontier
Deal found 10/29$160
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
jeu. 10/3010:45 pmMIA - SJU
Nonstop2h 47mFrontier
dim. 11/29:45 amSJU - MIA
Nonstop2h 47mFrontier
Deal found 10/29$161
This Frontier deal was found by Cheapflights users on 10/28. 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.
dim. 11/25:05 amMIA - SJU
Nonstop2h 40mFrontier
ven. 11/149:30 amSJU - MIA
Nonstop2h 47mFrontier
Deal found 10/28$163
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
lun. 11/1712:27 pmMIA - MAZ
1 stop20h 15mMultiple Airlines
dim. 11/234:36 pmMAZ - MIA
1 stop25h 40mMultiple Airlines
Deal found 10/29$261

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to Puerto Rico 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 octobre 30, 2025.
Use the filters below to find and compare flights from Key Largo to Puerto Rico that are best for you.

Fly from

Key Largo

Fly to

Puerto Rico

Route

Depart

Return

Price

MiamiSan Juan

MIA - SJU

MIASJU

Miami

lun. 1/26

6:55 am-2:55 pm

1 stop7h 00m

San Juan Luis Munoz Marin Intl

jeu. 1/29

5:40 am-4:10 pm

2 stops11h 30m

$234

MiamiSan Juan

MIA - SJU

MIASJU

Miami

sam. 11/15

6:20 am-5:25 pm

1 stop10h 05m

San Juan Luis Munoz Marin Intl

mer. 11/19

3:55 pm-9:50 pm

1 stop6h 55m

$234

MiamiSan Juan

MIA - SJU

MIASJU

Miami

lun. 1/26

5:20 pm-12:35 am

1 stop6h 15m

San Juan Luis Munoz Marin Intl

ven. 1/30

5:40 am-4:10 pm

2 stops11h 30m

$234

MiamiSan Juan

MIA - SJU

MIASJU

Miami

mar. 11/11

1:30 pm-11:20 pm

1 stop8h 50m

San Juan Luis Munoz Marin Intl

jeu. 11/13

11:55 am-10:05 pm

1 stop11h 10m

$234

MiamiSan Juan

MIA - SJU

MIASJU

Miami

sam. 11/15

6:00 am-2:17 pm

1 stop7h 17m

San Juan Luis Munoz Marin Intl

mer. 11/19

1:57 pm-12:46 am

1 stop11h 49m

$237

MiamiSan Juan

MIA - SJU

MIASJU

Miami

lun. 11/17

5:15 pm-12:35 am

1 stop6h 20m

San Juan Luis Munoz Marin Intl

mar. 11/18

5:45 am-12:05 pm

1 stop7h 20m

$254

MiamiSan Juan

MIA - SJU

MIASJU

Miami

ven. 11/7

6:55 am-7:50 pm

1 stop11h 55m

San Juan Luis Munoz Marin Intl

mar. 11/11

8:55 am-7:50 pm

2 stops11h 55m

$259

MiamiSan Juan

MIA - SJU

MIASJU

Miami

mar. 11/18

12:40 pm-12:35 am

2 stops10h 55m

San Juan Luis Munoz Marin Intl

mar. 11/25

3:25 pm-11:00 pm

1 stop8h 35m

$259

MiamiSan Juan

MIA - SJU

MIASJU

Miami

mar. 11/4

6:55 am-6:35 pm

1 stop10h 40m

San Juan Luis Munoz Marin Intl

jeu. 11/6

7:40 am-11:50 am

1 stop5h 10m

$259

MiamiMayagüez

MIA - MAZ

MIAMAZ

Miami

dim. 11/16

5:05 am-6:43 pm

1 stop12h 38m

Mayagüez Eugenio M De Hostos

dim. 11/23

4:36 pm-5:16 pm

1 stop25h 40m

$272

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 60 results
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Best time to book a flight from Key Largo to Puerto Rico

Have a flexible travel schedule? Discover the best time to fly to Puerto Rico 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 Puerto Rico

What is the cheapest month to book a flight from Key Largo to Puerto Rico?

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

Find hourly flight availability from Key Largo to Puerto Rico. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated octobre 30, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 49% on flights from Key Largo to Puerto Rico by exploring options for tickets in the evening.

What is the cheapest day to fly from Key Largo to Puerto Rico?

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

Travelers seeking maximum savings on their Key Largo to Puerto Rico 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.

Reviews of airlines servicing Puerto Rico

Get insights into the airlines that provide service to Puerto Rico. 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 Puerto Rico. Reviews last updated octobre 30, 2025.
Peruse reviews from past customers who have flown with Delta, American Airlines, and JetBlue from Key Largo to Puerto Rico 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.
Delta
7.9
Good
7,998 reviews

Food

7.3

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.2

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
7,998 reviews
Delta
7.9
Good
7,998 reviews

Food

7.3

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.2

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
11,035 reviews
Delta
7.9
Good
7,998 reviews

Food

7.3

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.2

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
2,906 reviews
Delta
7.9
Good
7,998 reviews

Food

7.3

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.2

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
8,116 reviews
Delta
7.9
Good
7,998 reviews

Food

7.3

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.2

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
3,122 reviews
Delta
7.9
Good
7,998 reviews

Food

7.3

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.2

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 Puerto Rico. 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 Puerto Rico?

    There are many flights that can get you from Key Largo to Puerto Rico in 7h. Fly via Southwest, Delta, or Frontier to get the fastest option. The distance from Key Largo to Puerto Rico is about 1044 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Key Largo to Puerto Rico one-way?

    The cheapest airline one-way is Spirit Airlines, with whom users have recently found tickets for as low as $99. However, be on the lookout for offers from Southwest and Frontier, as they are both options that can get you from Key Largo to Puerto Rico for a low price.

  • What are the most popular routes from Key Largo to Puerto Rico?

    Most travelers choose Miami - San Juan Luis Munoz Marin Intl, Miami - Aguadilla Borinquen or Miami - Vieques when deciding on the best route from Key Largo to Puerto Rico.

  • What are the most reliable airlines from Key Largo to Puerto Rico?

    Consider Spirit Airlines (92%), Frontier (80%) or British Airways (75%) when booking your flight. These represent the most reliable airlines when flying from Key Largo to Puerto Rico.

  • What are the cheapest flights from Key Largo to Puerto Rico?

    The cheapest flight price from Key Largo to Puerto Rico is $86. On average you can expect to pay $415. The most popular route, (Miami - San Juan Luis Munoz Marin Intl), can usually be booked for $119.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Key Largo to Puerto Rico 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 Puerto Rico?

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

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Alternative routes for Key Largo to Puerto Rico

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Key Largo to Puerto Rico

Discover the top 7 airlines that operate flights from Key Largo to Puerto Rico. 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 octobre 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$60Average$166FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$72Average$189FlexibilityNo cancel feeOn-time65%
DeltaCheapest$108Average$358FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$128Average$266FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$180Average$307FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$212Average$418FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$325Average$635FlexibilityNo cancel feeOn-time69%

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