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$75+ 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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SJU
Jun 21 — Jun 281
Sat 6/21
Sat 6/28
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 June 16, 2025.

Round-trip from

$133
(Cheapflightsfares)

One-way from

$75
(CheapOair)

Popular in

December

Cheapest in

September

Average price

$216
From Key Largo to Puerto Rico
Search Deals
One-way flight from Key Largo to Puerto Rico
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Highest demand for flights based on searches. 12% potential increase in price ($26 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 16, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 6/14. 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.
Tue 7/13:40 pmMIA - SJU
Nonstop2h 49mFrontier
Wed 7/97:34 pmSJU - MIA
Nonstop2h 49mFrontier
Deal found 6/14$156
This Priceline deal was found by Cheapflights users on 6/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/79:04 pmMIA - SJU
Nonstop2h 55mMultiple Airlines
Sat 7/121:31 pmSJU - MIA
Nonstop2h 50mMultiple Airlines
Deal found 6/15$157
This Kiwi.com deal was found by Cheapflights users on 6/16. 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.
Mon 6/236:33 pmMIA - SJU
Nonstop2h 31mSpirit Airlines
Tue 6/248:45 pmSJU - MIA
Nonstop2h 52mSpirit Airlines
Deal found 6/16$160
This American Airlines deal was found by Cheapflights users on 6/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/308:34 amMIA - SJU
Nonstop2h 37mAmerican Airlines
Sat 10/412:01 pmSJU - MIA
Nonstop2h 49mAmerican Airlines
Deal found 6/14$180
This Frontier deal was found by Cheapflights users on 6/14. 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 7/123:55 pmMIA - BQN
Nonstop2h 41mFrontier
Sat 7/197:31 pmBQN - MIA
Nonstop2h 35mFrontier
Deal found 6/14$198
This Southwest deal was found by Cheapflights users on 6/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/115:25 pmMIA - SJU
1 stop6h 25mSouthwest
Sun 9/145:05 amSJU - MIA
1 stop6h 25mSouthwest
Deal found 6/15$260
This United Airlines deal was found by Cheapflights users on 6/14. 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.
Fri 8/221:25 pmMIA - BQN
1 stop9h 44mUnited Airlines
Thu 8/2812:15 amBQN - MIA
1 stop9h 31mUnited Airlines
Deal found 6/14$425
This Mytrip deal was found by Cheapflights users on 6/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/276:33 pmMIA - VQS
1 stop24h 42mMultiple Airlines
Tue 7/12:45 pmVQS - MIA
1 stop8h 52mMultiple Airlines
Deal found 6/14$470
This Mytrip deal was found by Cheapflights users on 6/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/306:33 pmMIA - CPX
1 stop15h 20mMultiple Airlines
Fri 7/48:20 amCPX - MIA
3 stops29h 28mMultiple Airlines
Deal found 6/15$498
This Kissandfly.com deal was found by Cheapflights users on 6/15. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/297:00 pmMIA - CPX
1 stop14h 53mCape Air
Sat 7/55:11 pmCPX - MIA
1 stop4h 39mCape Air
Deal found 6/15$530
This United Airlines deal was found by Cheapflights users on 6/14. 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 7/91:35 pmMIA - CPX
2 stops27h 16mUnited Airlines
Tue 7/2210:13 amCPX - MIA
2 stops12h 32mUnited Airlines
Deal found 6/14$1,104
This United Airlines deal was found by Cheapflights users on 6/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/231:05 pmMIA - MAZ
2 stops26h 22mUnited Airlines
Thu 11/272:00 pmMAZ - MIA
2 stops29h 32mUnited Airlines
Deal found 6/15$1,435

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 June 16, 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

Tue 7/1

6:33 pm-9:04 pm

Nonstop2h 31m

San Juan Luis Munoz Marin Intl

Mon 7/7

8:45 pm-11:37 pm

Nonstop2h 52m

$133

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 7/1

6:33 pm-9:04 pm

Nonstop2h 31m

San Juan Luis Munoz Marin Intl

Sun 7/6

6:00 am-10:32 pm

1 stop16h 32m

$135

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 8/12

3:40 pm-6:31 pm

Nonstop2h 51m

San Juan Luis Munoz Marin Intl

Thu 8/21

8:57 pm-11:47 pm

Nonstop2h 50m

$146

MiamiAguadilla

MIA - BQN

MIABQN

Miami

Sat 7/12

3:55 pm-6:36 pm

Nonstop2h 41m

Aguadilla Borinquen

Sat 7/19

7:31 pm-10:06 pm

Nonstop2h 35m

$198

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 9/11

5:25 pm-11:50 pm

1 stop6h 25m

San Juan Luis Munoz Marin Intl

Sun 9/14

5:05 am-11:30 am

1 stop6h 25m

$260

MiamiAguadilla

MIA - BQN

MIABQN

Miami

Fri 8/22

1:25 pm-11:09 pm

1 stop9h 44m

Aguadilla Borinquen

Thu 8/28

12:15 am-9:46 am

1 stop9h 31m

$425

MiamiVieques

MIA - VQS

MIAVQS

Miami

Fri 6/27

6:33 pm-7:15 pm

1 stop24h 42m

Vieques

Tue 7/1

2:45 pm-11:37 pm

1 stop8h 52m

$470

MiamiCulebra

MIA - CPX

MIACPX

Miami

Mon 6/30

6:33 pm-9:53 am

1 stop15h 20m

Culebra

Fri 7/4

8:20 am-1:48 pm

3 stops29h 28m

$498

MiamiCulebra

MIA - CPX

MIACPX

Miami

Sun 6/29

7:00 pm-9:53 am

1 stop14h 53m

Culebra

Sat 7/5

5:11 pm-9:50 pm

1 stop4h 39m

$530

MiamiCulebra

MIA - CPX

MIACPX

Miami

Wed 7/9

1:35 pm-4:51 pm

2 stops27h 16m

Culebra

Tue 7/22

10:13 am-10:45 pm

2 stops12h 32m

$1,104

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/14

Showing 1-10 of 21 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, September is the cheapest month in which you can book a flight from Key Largo to Puerto Rico (average of $254). Flying from Key Largo to Puerto Rico in June is currently the most expensive (average of $339). 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 June 16, 2025.

When flying from Key Largo to Puerto Rico, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 June 16, 2025.

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 (17 on average).

Rainfall in Puerto Rico by month

Plan your trip to Puerto Rico by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Puerto Rico ranges from 2.2 - 6.1 inches per month. November is typically the wettest month, when rainfall can reach 6.1 in. February is typically the driest time to visit Puerto Rico when rainfall is around 2.2 in.

Temperature in Puerto Rico by month

Plan your trip to Puerto Rico by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Puerto Rico, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 77.0 F).

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 June 16, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta and United Airlines from Key Largo to Puerto Rico to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,278 reviews

Food

7.1

Crew

8.6

Overall

8.0

Entertainment

7.6

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,278 reviews
Southwest
8.0
Very good
4,278 reviews

Food

7.1

Crew

8.6

Overall

8.0

Entertainment

7.6

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Delta
8.0
Very good
7,963 reviews
Southwest
8.0
Very good
4,278 reviews

Food

7.1

Crew

8.6

Overall

8.0

Entertainment

7.6

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
United Airlines
7.4
Good
8,801 reviews
Southwest
8.0
Very good
4,278 reviews

Food

7.1

Crew

8.6

Overall

8.0

Entertainment

7.6

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,278 reviews

Food

7.1

Crew

8.6

Overall

8.0

Entertainment

7.6

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $75. However, be on the lookout for offers from Spirit Airlines and Southwest, 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 - Vieques 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 Atlas Air (100%), Qatar Airways (90%) or Spirit Airlines (81%) 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 $65. On average you can expect to pay $278. The most popular route, (Miami - San Juan Luis Munoz Marin Intl), can usually be booked for $116.

  • 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, September is the cheapest month in which you can book a flight from Key Largo to Puerto Rico (average of $254). Flying from Key Largo to Puerto Rico in June is currently the most expensive (average of $339). 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 June 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$47Average$145FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$61Average$162FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$83Average$259FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$177Average$305FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$201Average$403FlexibilityNo cancel feeOn-time71%
DeltaCheapest$302Average$302FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$325Average$504FlexibilityNo cancel feeOn-time69%

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