HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Puerto Rico

$64+ 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 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
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Key Largo to Puerto Rico 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.

Cheap 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 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
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/172:29 pmMIA - BQN
1 stop8h 28mUnited Airlines
Sat 12/201:09 amBQN - MIA
1 stop9h 42mUnited Airlines
Deal found 12/17$605
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/295:30 amMIA - BQN
2 stops20h 40mFrontier
Thu 1/13:55 amBQN - MIA
2 stops21h 52mFrontier
Deal found 12/16$843
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/242:25 pmMIA - BQN
1 stop8h 32mUnited Airlines
Mon 12/291:09 amBQN - MIA
1 stop9h 42mUnited Airlines
Deal found 12/17$885

Find 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 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 Puerto Rico
Search Deals
One-way flight from Key Largo to Puerto Rico
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
Search Deals

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 December 18, 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

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 53 results
1
2
3
...
6

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, February is the cheapest month in which you can book a flight from Key Largo to Puerto Rico (average of $60). 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 December 18, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 48% 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. Saturday evenings 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 December 18, 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
8,005 reviews

Comfort

7.9

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

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
8,005 reviews
Delta
7.9
Good
8,005 reviews

Comfort

7.9

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

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

Comfort

7.9

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

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
2,897 reviews
Delta
7.9
Good
8,005 reviews

Comfort

7.9

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

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

Comfort

7.9

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

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

Comfort

7.9

Boarding

8.1

Food

7.3

Overall

7.9

Entertainment

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 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 2h 40m. Fly via Frontier or Delta 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 $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 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 Royal Air Maroc (100%), British Airways (85%) or Frontier (82%) 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 $62. On average you can expect to pay $458. The most popular route, (Miami - San Juan Luis Munoz Marin Intl), can usually be booked for $95.

  • 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, February is the cheapest month in which you can book a flight from Key Largo to Puerto Rico (average of $60). 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

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 Puerto Rico

See prices for flight routes from nearby airports that may be better suited for you.
Orlando to Luis Munoz Marin Intl flights
Tampa to Luis Munoz Marin Intl flights
Orlando to Punta Cana flights
Fort Lauderdale to Luis Munoz Marin Intl flights
Fort Lauderdale to Santo Domingo flights
Miami to Santo Domingo flights
Miami to Punta Cana flights
Fort Lauderdale to Punta Cana flights
Miami to Luis Munoz Marin Intl flights
Miami to Nassau flights
Orlando to Santo Domingo flights
Fort Lauderdale to Nassau flights
Fort Lauderdale to Montego Bay flights
Fort Lauderdale to Kingston flights
West Palm Beach to Luis Munoz Marin Intl flights
Orlando to Ponce flights
Orlando to Aguadilla flights
Orlando to Montego Bay flights
Miami to Havana flights
Jacksonville to Luis Munoz Marin Intl flights
Miami to Port of Spain flights
Miami to Oranjestad flights
Tampa to Punta Cana flights
Orlando to Santiago de los Caballeros flights
Miami to Simpson Bay flights
Miami to Providenciales flights
Orlando to Saint Thomas Island flights
Orlando to Oranjestad flights
Orlando to Port of Spain flights
Orlando to Nassau flights
Fort Lauderdale to Saint Thomas Island flights
Fort Lauderdale to Santiago de los Caballeros flights
Miami to Saint Thomas Island flights
Miami to Willemstad flights
Tampa to Nassau flights
Fort Lauderdale to Simpson Bay flights
Miami to Castries flights
Miami to Montego Bay flights
Miami to Kingston flights
Miami to Santiago de los Caballeros flights
Fort Lauderdale to Oranjestad flights
Fort Lauderdale to Port of Spain flights
Tampa to Saint Thomas Island flights
Miami to George Town flights
Miami to Bridgetown flights
Miami to Cap Haitien flights
Tampa to George Town flights
Fort Lauderdale to Aguadilla flights
Miami to St. John's flights
Miami to Road Town flights

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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$65Average$177FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$74Average$192FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$93Average$268FlexibilityNo cancel feeOn-time62%
DeltaCheapest$108Average$328FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$180Average$313FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$222Average$420FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$325Average$635FlexibilityNo cancel feeOn-time69%

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.