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$67+ Cheap flights from Key Largo, FL to San Juan

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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SJU
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to San Juan are usually found in October or September, booked 51 days in advance, depart on a Monday or Tuesday and return on a Friday

Cheap flight deals from Key Largo to San Juan

Keep the following information in mind while searching for Key Largo to San Juan flight deals. Data was last updated July 31, 2025.

Round-trip from

$152
(Kiwi.com)

One-way from

$67
(Cheapflightsfares)

Popular in

December

Cheapest in

October

Average price

$223
From Key Largo to San Juan
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One-way flight from Key Largo to San Juan
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Highest demand for flights based on searches. 7% potential increase in price ($16 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Key Largo to San Juan

Cheapest flights from Key Largo to San Juan
Explore the most affordable flight options available from Key Largo to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/30. 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 8/63:40 pmMIA - SJU
Nonstop2h 51mMultiple Airlines
Thu 8/148:00 pmSJU - MIA
Nonstop2h 34mMultiple Airlines
Deal found 7/30$152
This CheapOair deal was found by Cheapflights users on 7/29. 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.
Fri 10/105:51 pmMIA - SJU
Nonstop2h 43mFrontier
Mon 10/139:39 pmSJU - MIA
Nonstop2h 50mFrontier
Deal found 7/29$153
This CheapOair deal was found by Cheapflights users on 7/29. 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.
Tue 8/1211:44 amMIA - SJU
1 stop10h 06mSpirit Airlines
Thu 8/218:00 pmSJU - MIA
Nonstop2h 34mSpirit Airlines
Deal found 7/29$155
This American Airlines deal was found by Cheapflights users on 7/30. 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.
Sat 8/169:20 pmMIA - SJU
Nonstop2h 39mAmerican Airlines
Mon 8/187:05 pmSJU - MIA
Nonstop2h 45mAmerican Airlines
Deal found 7/30$180

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to San Juan 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 July 31, 2025.
Use the filters below to find and compare flights from Key Largo to San Juan that are best for you.

Fly from

Key Largo

Fly to

San Juan

Route

Depart

Return

Price

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 8/6

3:40 pm-6:31 pm

Nonstop2h 51m

San Juan Luis Munoz Marin Intl

Thu 8/14

8:00 pm-10:34 pm

Nonstop2h 34m

$152

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Fri 10/10

5:51 pm-8:34 pm

Nonstop2h 43m

San Juan Luis Munoz Marin Intl

Mon 10/13

9:39 pm-12:29 am

Nonstop2h 50m

$153

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 8/12

11:44 am-9:50 pm

1 stop10h 06m

San Juan Luis Munoz Marin Intl

Thu 8/21

8:00 pm-10:34 pm

Nonstop2h 34m

$155

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sat 8/16

9:20 pm-11:59 pm

Nonstop2h 39m

San Juan Luis Munoz Marin Intl

Mon 8/18

7:05 pm-9:50 pm

Nonstop2h 45m

$180

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Mon 8/11

9:04 pm-11:59 pm

Nonstop2h 55m

$67

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Mon 8/25

6:30 am-9:05 am

Nonstop2h 35m

$70

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 9/30

10:06 am-12:47 pm

Nonstop2h 41m

$90

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sun 9/7

7:00 am-1:15 pm

1 stop6h 15m

$95

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Mon 10/27

6:00 am-4:33 pm

1 stop10h 33m

$113

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Best time to book a flight from Key Largo to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan 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 San Juan

How far ahead should I book a flight from Key Largo to San Juan?

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to San Juan. Price data was last updated on July 25, 2025.

The price you pay for your flight from Key Largo to San Juan may vary depending on when you book. For the best chance of a lower fare, look to book 51 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Key Largo to San Juan?

Currently, September is the cheapest month in which you can book a flight from Key Largo to San Juan (average of $254). Flying from Key Largo to San Juan 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 SJU?

Find hourly flight availability from Key Largo to San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 31, 2025.

When flying from Key Largo to San Juan, 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 San Juan?

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

Travelers seeking maximum savings on their Key Largo to San Juan flight should consider departing on Monday evenings when fares are most often at their lowest. Wednesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Key Largo to San Juan

Explore weekly flight availability from Key Largo to San Juan. 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 July 31, 2025.

The most flights from KE9 to PR1 are scheduled on a Thursday (20 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (12 on average).

How much does it cost to fly round-trip from Key Largo to San Juan?

Reviews of airlines servicing San Juan

Get insights into the airlines that provide service to San Juan. 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 San Juan. Reviews last updated July 31, 2025.
Read through reviews of airlines operating flights from Key Largo to San Juan, such as Southwest, Delta, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,981 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Spirit Airlines
6.3
Okay
8,048 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Frontier
5.9
Fair
3,239 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Related info for your journey

Find useful and relevant information for your journey from Key Largo to San Juan. 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 San Juan one-way?

    To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $67. Frontier flights start at $68 while deals on American Airlines start at $90 one-way.

  • What are the most reliable airlines from Key Largo to San Juan?

    The top 3 most reliable airlines when flying from Key Largo to San Juan are Atlas Air (89%), American Airlines (77%) and Iberia (77%).

  • What are the cheapest flights from Key Largo to San Juan?

    Looking for the cheapest flight from Key Largo to San Juan? While on average our users pay $187, our data indicates the cheapest price to be $66. The most popular route (Miami - San Juan Luis Munoz Marin Intl), is priced around $115.

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

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

  • How can I find direct flights from Key Largo to San Juan?

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

  • Can I find deals for business class flights from Key Largo to San Juan?

    Yes. Cheapflights offers flight deals from Key Largo to San Juan 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 San Juan?

    Currently, September is the cheapest month in which you can book a flight from Key Largo to San Juan (average of $254). Flying from Key Largo to San Juan 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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Top 6 airlines flying from Key Largo to San Juan

Discover the top 6 airlines that operate flights from Key Largo to San Juan. 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$48Average$161FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$60Average$177FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$83Average$283FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$176Average$304FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$203Average$411FlexibilityNo cancel feeOn-time71%
DeltaCheapest$302Average$302FlexibilityNo cancel feeOn-timeN/A

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