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$74+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SJU
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$145
(Kiwi.com)

One-way from

$74
(eDestinos)

Popular in

August

Cheapest in

October

Average price

$228
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. 18% potential increase in price ($45 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 16, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/165:13 pmMIA - SJU
Nonstop2h 43mFrontier
Sun 10/195:30 amSJU - MIA
Nonstop2h 48mFrontier
Deal found 9/15$145
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/205:13 pmMIA - SJU
Nonstop2h 43mFrontier
Tue 10/216:22 amSJU - MIA
2 stops12h 23mFrontier
Deal found 9/15$146
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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.
Fri 10/175:13 pmMIA - SJU
Nonstop2h 43mFrontier
Sun 10/195:30 amSJU - MIA
Nonstop2h 48mFrontier
Deal found 9/15$148
This Mytrip deal was found by Cheapflights users on 9/14. 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.
Mon 9/297:10 amMIA - SJU
Nonstop2h 42mFrontier
Fri 10/37:50 pmSJU - MIA
Nonstop2h 47mFrontier
Deal found 9/14$149
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/175:13 pmMIA - SJU
Nonstop2h 43mFrontier
Mon 11/39:30 amSJU - MIA
Nonstop2h 47mFrontier
Deal found 9/15$150
This eDestinos deal was found by Cheapflights users on 9/15. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/57:10 amMIA - SJU
Nonstop2h 42mFrontier
Sun 10/195:30 amSJU - MIA
Nonstop2h 48mFrontier
Deal found 9/15$153
This SmartFares deal was found by Cheapflights users on 9/15. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3010:45 pmMIA - SJU
Nonstop2h 47mFrontier
Thu 11/66:54 pmSJU - MIA
Nonstop2h 51mFrontier
Deal found 9/15$155
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Sun 10/199:18 amMIA - SJU
Nonstop2h 43mFrontier
Mon 10/279:06 pmSJU - MIA
Nonstop2h 50mFrontier
Deal found 9/16$156
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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.
Mon 9/297:10 amMIA - SJU
Nonstop2h 42mFrontier
Thu 10/210:57 amSJU - MIA
Nonstop2h 53mFrontier
Deal found 9/14$157
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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.
Thu 12/118:59 pmMIA - SJU
Nonstop2h 38mFrontier
Thu 12/189:30 pmSJU - MIA
Nonstop3h 00mFrontier
Deal found 9/14$162
This Priceline deal was found by Cheapflights users on 9/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/57:10 amMIA - SJU
Nonstop2h 42mFrontier
Sun 10/125:30 amSJU - MIA
Nonstop2h 48mFrontier
Deal found 9/16$163
This Frontier deal was found by Cheapflights users on 9/13. 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 11/81:58 pmMIA - BQN
2 stops12h 06mFrontier
Thu 11/133:59 amBQN - MIA
2 stops14h 14mFrontier
Deal found 9/13$278

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 September 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 10/21

11:45 am-10:45 pm

1 stop11h 00m

San Juan Luis Munoz Marin Intl

Fri 10/24

5:50 am-6:50 pm

1 stop13h 00m

$175

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 10/7

12:44 pm-12:29 am

2 stops11h 45m

San Juan Luis Munoz Marin Intl

Wed 10/8

6:22 am-6:45 pm

2 stops12h 23m

$239

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sat 11/15

8:15 am-11:15 pm

1 stop14h 00m

San Juan Luis Munoz Marin Intl

Tue 11/18

8:55 am-8:45 pm

2 stops12h 50m

$281

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 10/1

7:45 am-7:45 pm

2 stops12h 00m

San Juan Luis Munoz Marin Intl

Sat 10/4

5:45 am-8:30 pm

1 stop14h 45m

$281

MiamiAguadilla

MIA - BQN

MIABQN

Miami

Thu 11/6

7:30 am-3:04 am

2 stops18h 34m

Aguadilla Borinquen

Thu 11/13

3:59 am-5:13 pm

2 stops14h 14m

$324

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 9/25

6:05 am-6:45 pm

2 stops12h 40m

San Juan Luis Munoz Marin Intl

Thu 10/2

5:50 am-6:50 pm

1 stop13h 00m

$326

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 11/25

12:05 pm-1:25 am

1 stop12h 20m

San Juan Luis Munoz Marin Intl

Tue 12/2

8:55 am-8:45 pm

2 stops12h 50m

$332

MiamiAguadilla

MIA - BQN

MIABQN

Miami

Thu 10/2

7:25 am-2:27 am

2 stops19h 02m

Aguadilla Borinquen

Sun 10/5

3:32 am-8:06 pm

2 stops16h 34m

$334

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Mon 12/1

11:30 am-1:25 am

2 stops12h 55m

San Juan Luis Munoz Marin Intl

Mon 12/8

3:55 pm-9:50 pm

1 stop6h 55m

$340

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Fri 11/28

5:25 pm-12:35 am

1 stop6h 10m

San Juan Luis Munoz Marin Intl

Sun 12/7

7:40 am-11:50 am

1 stop5h 10m

$340

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 51 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 September 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.

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 Saturday afternoons when fares are most often at their lowest. Saturday afternoons 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 September 16, 2025.

The most flights from KE9 to PR0 are scheduled on a Monday (17 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (10 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 September 16, 2025.
Peruse reviews from past customers who have flown with United Airlines, 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.
United Airlines
7.4
Good
8,924 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,924 reviews
United Airlines
7.4
Good
8,924 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,924 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
JetBlue
7.2
Good
2,914 reviews
United Airlines
7.4
Good
8,924 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Spirit Airlines
6.3
Okay
8,019 reviews
United Airlines
7.4
Good
8,924 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Frontier
5.8
Fair
3,174 reviews
United Airlines
7.4
Good
8,924 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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 8h 14m. Fly via Southwest, Frontier, or United Airlines to get the fastest option. The distance from Key Largo to Puerto Rico is about 980 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 Southwest, with whom users have recently found tickets for as low as $88. However, be on the lookout for offers from Frontier and United Airlines, 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 Atlas Air (92%), British Airways (71%) or Iberia (70%) 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 $317. The most popular route, (Miami - San Juan Luis Munoz Marin Intl), can usually be booked for $122.

  • 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 6 airlines flying from Key Largo to Puerto Rico

Discover the top 6 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$51Average$152FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$63Average$183FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$99Average$291FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$180Average$323FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$207Average$416FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$325Average$606FlexibilityNo cancel feeOn-time69%

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