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$73+ 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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SJU
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to San Juan are usually found in September or October, booked 51 days in advance, depart on a Tuesday or Monday 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 June 12, 2025.

Round-trip from

$128
(Kiwi.com)

One-way from

$74
(CheapOair)

Popular in

December

Cheapest in

September

Average price

$213
From Key Largo to San Juan
Search Deals
One-way flight from Key Largo to San Juan
Search Deals
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 ($10 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 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 June 12, 2025.

This Kiwi.com deal was found by Cheapflights users on 6/11. 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 6/256:33 pmMIA - SJU
Nonstop2h 31mSpirit Airlines
Thu 6/267:36 pmSJU - MIA
Nonstop2h 50mSpirit Airlines
Deal found 6/11$128
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 6/243:40 pmMIA - SJU
Nonstop2h 49mMultiple Airlines
Thu 6/267:36 pmSJU - MIA
Nonstop2h 50mMultiple Airlines
Deal found 6/11$132
This Priceline deal was found by Cheapflights users on 6/11. 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.
Fri 10/314:10 pmMIA - SJU
1 stop7h 48mFrontier
Sat 11/11:11 amSJU - MIA
1 stop22h 50mFrontier
Deal found 6/11$145
This American Airlines deal was found by Cheapflights users on 6/11. 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 9/1612:10 pmMIA - SJU
Nonstop2h 43mAmerican Airlines
Mon 9/297:05 pmSJU - MIA
Nonstop2h 45mAmerican Airlines
Deal found 6/11$240

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 June 12, 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 6/25

6:33 pm-9:04 pm

Nonstop2h 31m

San Juan Luis Munoz Marin Intl

Thu 6/26

7:36 pm-10:26 pm

Nonstop2h 50m

$128

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 6/24

3:40 pm-6:29 pm

Nonstop2h 49m

San Juan Luis Munoz Marin Intl

Thu 6/26

7:36 pm-10:26 pm

Nonstop2h 50m

$132

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Fri 10/31

4:10 pm-11:58 pm

1 stop7h 48m

San Juan Luis Munoz Marin Intl

Sat 11/1

1:11 am-12:01 am

1 stop22h 50m

$145

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 9/16

12:10 pm-2:53 pm

Nonstop2h 43m

San Juan Luis Munoz Marin Intl

Mon 9/29

7:05 pm-9:50 pm

Nonstop2h 45m

$240

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sat 10/25

7:05 am-2:15 pm

1 stop7h 10m

$73

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 6/17

6:33 pm-9:04 pm

Nonstop2h 31m

$76

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 7/16

12:00 pm-11:25 pm

1 stop11h 25m

$84

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 9/9

3:35 pm-6:14 pm

Nonstop2h 39m

$115

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 6/25

2:22 pm-11:57 pm

1 stop9h 35m

$213

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

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 June 9, 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 June 12, 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. 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 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 June 12, 2025.

The most flights from KE9 to PR1 are scheduled on a Thursday (20 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (16 on average).

Rainfall in San Juan by month

Plan your trip to San Juan by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Juan 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 San Juan when rainfall is around 2.2 in.

Temperature in San Juan by month

Plan your trip to San Juan by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Juan, 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 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 June 12, 2025.
See what other customers who have flown with Southwest, United Airlines and American Airlines from Key Largo to San Juan have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,287 reviews

Entertainment

7.6

Overall

8.0

Boarding

8.2

Food

7.1

Crew

8.6

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
4,287 reviews
Southwest
8.0
Very good
4,287 reviews

Entertainment

7.6

Overall

8.0

Boarding

8.2

Food

7.1

Crew

8.6

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
8,790 reviews
Southwest
8.0
Very good
4,287 reviews

Entertainment

7.6

Overall

8.0

Boarding

8.2

Food

7.1

Crew

8.6

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
4,287 reviews

Entertainment

7.6

Overall

8.0

Boarding

8.2

Food

7.1

Crew

8.6

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.
Spirit Airlines
6.3
Okay
8,052 reviews
Southwest
8.0
Very good
4,287 reviews

Entertainment

7.6

Overall

8.0

Boarding

8.2

Food

7.1

Crew

8.6

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.
Frontier
6.0
Okay
3,295 reviews
Southwest
8.0
Very good
4,287 reviews

Entertainment

7.6

Overall

8.0

Boarding

8.2

Food

7.1

Crew

8.6

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 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 Frontier, which is currently one of the cheapest options available, starting at $74. Spirit Airlines flights start at $76 while deals on Southwest start at $84 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 Qatar Airways (88%), Spirit Airlines (84%) and Frontier (84%).

  • 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 $278, our data indicates the cheapest price to be $65. The most popular route (Miami - San Juan Luis Munoz Marin Intl), is priced around $118.

  • 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$47Average$144FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$61Average$159FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$83Average$254FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$175Average$306FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$200Average$403FlexibilityNo cancel feeOn-time71%
DeltaCheapest$302Average$302FlexibilityNo cancel feeOn-timeN/A

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