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$59+ 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 3/21. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SJU
Mar 9 — Mar 161
Mon 3/9
Mon 3/16
1 adult, Economy
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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 February 7, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Mon 4/69:25 pm
MIA
-
SJU
Nonstop2h 33m
Multiple Airlines
Fri 4/106:00 am
SJU
-
MIA
Nonstop3h 00m
Multiple Airlines
Deal found 2/4$117
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Wed 3/113:26 pm
MIA
-
SJU
Nonstop2h 32m
Spirit Airlines
Tue 3/2411:03 am
SJU
-
MIA
Nonstop2h 52m
Spirit Airlines
Deal found 2/4$118
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 2/243:26 pm
MIA
-
SJU
Nonstop2h 32m
Multiple Airlines
Fri 2/276:00 am
SJU
-
MIA
Nonstop2h 57m
Multiple Airlines
Deal found 2/6$119
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 4/210:36 pm
MIA
-
SJU
Nonstop2h 41m
Multiple Airlines
Tue 4/711:03 am
SJU
-
MIA
Nonstop2h 52m
Multiple Airlines
Deal found 2/5$120
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Wed 3/1110:40 pm
MIA
-
SJU
Nonstop2h 39m
Multiple Airlines
Wed 3/2511:03 am
SJU
-
MIA
Nonstop2h 52m
Multiple Airlines
Deal found 2/4$121
This Frontier deal was found by Cheapflights users on 2/3. 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 3/2310:42 pm
MIA
-
SJU
Nonstop2h 39m
Frontier
Tue 3/316:39 pm
SJU
-
MIA
Nonstop3h 01m
Frontier
Deal found 2/3$122
This Cheapflightsfares deal was found by Cheapflights users on 2/5. 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.
Wed 2/187:05 am
MIA
-
SJU
1 stop6h 17m
Spirit Airlines
Thu 2/2611:52 am
SJU
-
MIA
Nonstop2h 58m
Spirit Airlines
Deal found 2/5$123
This Spirit deal was found by Cheapflights users on 2/6. 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 Spirit is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/31:38 pm
MIA
-
SJU
1 stop10h 59m
Spirit Airlines
Tue 3/1010:52 am
SJU
-
MIA
Nonstop2h 58m
Spirit Airlines
Deal found 2/6$124
This Kiwi.com deal was found by Cheapflights users on 2/7. 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.
Wed 3/43:26 pm
MIA
-
SJU
Nonstop2h 32m
Multiple Airlines
Tue 3/106:39 pm
SJU
-
MIA
Nonstop3h 01m
Multiple Airlines
Deal found 2/7$125
This Frontier deal was found by Cheapflights users on 2/6. 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 3/29:02 am
MIA
-
SJU
Nonstop2h 37m
Frontier
Mon 3/96:46 pm
SJU
-
MIA
Nonstop3h 01m
Frontier
Deal found 2/6$126
This Cheapflightsfares deal was found by Cheapflights users on 2/7. 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 3/269:25 pm
MIA
-
SJU
Nonstop2h 33m
Spirit Airlines
Tue 3/3112:05 pm
SJU
-
MIA
1 stop8h 02m
Spirit Airlines
Deal found 2/7$127
This CheapOair deal was found by Cheapflights users on 2/6. 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.
Tue 3/103:26 pm
MIA
-
SJU
Nonstop2h 32m
Spirit Airlines
Tue 3/1712:05 pm
SJU
-
MIA
1 stop8h 02m
Spirit Airlines
Deal found 2/6$128

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 February 7, 2026.

Round-trip from

$117
(Kiwi.com)

One-way from

$59
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$171
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. 10% potential increase in price ($26 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 7, 2026.
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 3/9

7:05 am-4:32 pm

1 stop9h 27m

San Juan Luis Munoz Marin Intl

Tue 3/10

10:52 am-1:50 pm

Nonstop2h 58m

$128

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sat 3/7

2:15 pm-5:55 pm

Nonstop2h 40m

San Juan Luis Munoz Marin Intl

Thu 3/19

12:05 pm-8:07 pm

1 stop8h 02m

$182

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 3/10

1:38 pm-12:37 am

1 stop10h 59m

San Juan Luis Munoz Marin Intl

Sun 3/15

11:03 am-1:55 pm

Nonstop2h 52m

$188

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 5/6

4:44 pm-11:13 pm

1 stop6h 29m

San Juan Luis Munoz Marin Intl

Sun 5/10

5:15 pm-12:55 am

1 stop7h 40m

$210

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 5/12

12:10 pm-9:05 pm

2 stops8h 55m

San Juan Luis Munoz Marin Intl

Sat 5/16

10:00 am-11:00 pm

1 stop13h 00m

$235

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 4/28

7:00 am-6:10 pm

1 stop11h 10m

San Juan Luis Munoz Marin Intl

Tue 5/5

8:10 am-9:10 pm

2 stops13h 00m

$235

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 2/26

3:26 pm-6:58 pm

Nonstop2h 32m

San Juan Luis Munoz Marin Intl

Sun 3/1

11:52 am-1:50 pm

Nonstop2h 58m

$279

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 3/5

9:02 am-12:39 pm

Nonstop2h 37m

San Juan Luis Munoz Marin Intl

Sun 3/8

10:52 am-1:50 pm

Nonstop2h 58m

$286

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 6/11

5:55 am-10:45 am

1 stop4h 50m

San Juan Luis Munoz Marin Intl

Mon 6/15

4:00 pm-10:05 pm

1 stop6h 05m

$287

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 4/2

9:25 pm-11:58 pm

Nonstop2h 33m

San Juan Luis Munoz Marin Intl

Sat 4/11

1:39 am-12:47 pm

1 stop11h 08m

$293

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

Showing 1-10 of 57 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, March is the cheapest month in which you can book a flight from Key Largo to Puerto Rico (average of $61). 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 February 7, 2026.

Unlike at noon, when flights are generally more expensive, you can save up to 21% on flights from Key Largo to Puerto Rico by exploring options for tickets in the afternoon.

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 January 31, 2026.

Travelers seeking maximum savings on their Key Largo to Puerto Rico flight should consider departing on Friday afternoons 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.

Weekly flight availability from Key Largo to Puerto Rico

Explore weekly flight availability from Key Largo to Puerto Rico. 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 February 7, 2026.

The most flights from KE9 to PR0 are scheduled on a Thursday (20 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (8 on average).

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 February 7, 2026.
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
8,169 reviews

Food

7.2

Boarding

8.1

Overall

7.9

Entertainment

7.8

Crew

8.5

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
8,169 reviews
Delta
7.9
Good
8,169 reviews

Food

7.2

Boarding

8.1

Overall

7.9

Entertainment

7.8

Crew

8.5

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
11,248 reviews
Delta
7.9
Good
8,169 reviews

Food

7.2

Boarding

8.1

Overall

7.9

Entertainment

7.8

Crew

8.5

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
2,898 reviews
Delta
7.9
Good
8,169 reviews

Food

7.2

Boarding

8.1

Overall

7.9

Entertainment

7.8

Crew

8.5

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
8,425 reviews
Delta
7.9
Good
8,169 reviews

Food

7.2

Boarding

8.1

Overall

7.9

Entertainment

7.8

Crew

8.5

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
5.7
Fair
3,053 reviews
Delta
7.9
Good
8,169 reviews

Food

7.2

Boarding

8.1

Overall

7.9

Entertainment

7.8

Crew

8.5

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 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 6h 29m. Fly via Spirit Airlines, Delta, or Southwest 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 $42. 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 - Culebra 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 (92%), Finnair (83%) or British Airways (80%) 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 $428. The most popular route, (Miami - San Juan Luis Munoz Marin Intl), can usually be booked for $78.

  • 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, March is the cheapest month in which you can book a flight from Key Largo to Puerto Rico (average of $61). 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 February 7, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$64Average$185FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$67Average$194FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$83Average$270FlexibilityNo cancel feeOn-time62%
DeltaCheapest$108Average$108FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$189Average$316FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$219Average$440FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$325Average$661FlexibilityNo cancel feeOn-time69%

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