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 $47. Spirit Airlines flights start at $54 while deals on Southwest start at $88 one-way.

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 $402, our data indicates the cheapest price to be $58. The most popular route (Miami - San Juan Luis Munoz Marin Intl), is priced around $95.

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 Royal Air Maroc (100%), Spirit Airlines (80%) and Frontier (77%).

What are the most popular airlines that fly from Key Largo to San Juan?

Consider American Airlines, JetBlue or Delta when booking your flight. These represent the most popular airlines when flying from Key Largo to San Juan.

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

To save up to 69% on this flight, we recommend booking at least 52 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Key Largo to San Juan from $127 1-2 weeks out and tickets from $210 for flights departing within the next 72 hours.

What is the cheapest month to fly from Key Largo to San Juan?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, September can be a great choice for travel to San Juan. Flights to San Juan from Key Largo in September are about $171 on average during September, but can be found for as low as $59.

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.

$47+ Flights from Key Largo to San Juan - Compare & Save Big

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Find cheap flights from Key Largo to San Juan with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

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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 Wednesday and return on a Friday

Cheap flight deals from Key Largo to San Juan

Most accurate provider	Expedia 1 star
Most trusted provider	Expedia 3 stars
Round-trip from	$106 (Cheapflightsfares)
One-way from	$47 (CheapOair)
Popular in	December
Cheapest in	September
Average price	$174

Provider with most accurate pricing for Miami-San Juan flight deals.

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Provider most trusted by Cheapflights users for Miami-San Juan flights.

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From Key Largo to San Juan

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One-way flight from Key Largo to San Juan

Search Deals

Highest demand for flights based on searches. 18% potential increase in price ($38 potential increase over avg. RT price).

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Cheapest flight prices on average. 6% potential price decrease ($10 potential savings vs. average RT price).

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Average for round-trip flights in April 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 April 29, 2025.

Thu 5/87:25 amMIA - SJU

Nonstop2h 35mFrontier

Sat 5/179:30 pmSJU - MIA

Nonstop2h 56mFrontier

Deal found 4/28

$106

Thu 5/85:28 pmMIA - SJU

Nonstop2h 34mMultiple Airlines

Fri 6/69:30 pmSJU - MIA

Nonstop2h 51mMultiple Airlines

Deal found 4/29

$107

Sat 5/1012:00 pmMIA - SJU

Nonstop2h 30mSpirit Airlines

Sun 5/118:57 pmSJU - MIA

Nonstop2h 50mSpirit Airlines

Deal found 4/29

$113

Tue 9/1612:05 pmMIA - SJU

1 stop10h 03mDelta

Mon 9/292:28 pmSJU - MIA

1 stop10h 24mDelta

Deal found 4/29

$225

Best flights from Key Largo to San Juan
Discover carefully curated flight deals from Key Largo to San Juan that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 29, 2025.

Tue 5/208:15 amMIA - SJU

Nonstop2h 38mMultiple Airlines

Fri 5/307:45 pmSJU - MIA

Nonstop2h 49mMultiple Airlines

Deal found 4/28

$106

Tue 6/173:40 pmMIA - SJU

Nonstop2h 49mFrontier

Thu 6/192:05 pmSJU - MIA

Nonstop2h 54mFrontier

Deal found 4/28

$112

Sat 5/1012:00 pmMIA - SJU

Nonstop2h 30mSpirit Airlines

Sun 5/118:57 pmSJU - MIA

Nonstop2h 50mSpirit Airlines

Deal found 4/29

$113

Tue 9/1612:05 pmMIA - SJU

1 stop10h 03mDelta

Mon 9/292:28 pmSJU - MIA

1 stop10h 24mDelta

Deal found 4/29

$225

Sat 5/105:05 amMIA - SJU

1 stop9h 10mSouthwest

Tue 5/138:00 amSJU - MIA

2 stops13h 55mSouthwest

Deal found 4/27

$271

Last-minute flights from Key Largo to San Juan
Discover last-minute flight deals from Key Largo to San Juan. Data last updated April 29, 2025 and is based on user searches.

Tue 5/66:00 amMIA - SJU

Nonstop2h 26mSpirit Airlines

Thu 5/88:57 pmSJU - MIA

Nonstop2h 50mSpirit Airlines

Deal found 4/29

$114

Wed 5/712:05 pmMIA - SJU

1 stop7h 43mDelta

Fri 5/96:15 amSJU - MIA

1 stop8h 39mDelta

Deal found 4/28

$225

Thu 5/87:25 amMIA - SJU

Nonstop2h 35mFrontier

Sat 5/179:30 pmSJU - MIA

Nonstop2h 56mFrontier

Deal found 4/28

$106

Thu 5/85:28 pmMIA - SJU

Nonstop2h 34mMultiple Airlines

Fri 6/69:30 pmSJU - MIA

Nonstop2h 51mMultiple Airlines

Deal found 4/29

$107

Thu 5/811:55 amMIA - SJU

1 stop11h 35mSouthwest

Tue 5/138:00 amSJU - MIA

2 stops13h 55mSouthwest

Deal found 4/27

$317

Thu 5/85:35 amMIA - SJU

1 stop6h 05mDelta

Sun 5/116:15 amSJU - MIA

1 stop8h 39mDelta

Deal found 4/29

$235

Sat 5/1012:00 pmMIA - SJU

Nonstop2h 30mSpirit Airlines

Sun 5/118:57 pmSJU - MIA

Nonstop2h 50mSpirit Airlines

Deal found 4/29

$113

One-way flights from Key Largo to San Juan
Search for one-way flight options from Key Largo to San Juan. Find affordable one-way fares based on user searches. Data last updated April 29, 2025.

Mon 5/197:15 amMIA - SJU

Nonstop2h 35mFrontier

Deal found 4/28

$47

Tue 5/611:05 amMIA - SJU

1 stop8h 35mSpirit Airlines

Deal found 4/28

$54

Wed 5/1412:45 pmMIA - SJU

1 stop9h 45mSouthwest

Deal found 4/28

$88

Wed 5/710:37 amMIA - SJU

1 stop9h 11mDelta

Deal found 4/28

$113

Mon 5/1210:04 amMIA - SJU

Nonstop2h 35mAmerican Airlines

Deal found 4/29

$199

Wed 5/211:57 pmMIA - SJU

1 stop10h 00mUnited Airlines

Deal found 4/29

$208

Tue 6/32:30 pmMIA - SJU

1 stop11h 19mJetBlue

Deal found 4/28

$210

Cheapflights Fare Finder

Use the filters below to find and compare flights from Key Largo to San Juan that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 5/8

7:25 am-10:00 am

Nonstop2h 35m

San Juan Luis Munoz Marin Intl

Sat 5/17

9:30 pm-12:26 am

Nonstop2h 56m

$106

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 5/8

5:28 pm-8:02 pm

Nonstop2h 34m

San Juan Luis Munoz Marin Intl

Fri 6/6

9:30 pm-12:21 am

Nonstop2h 51m

$107

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Sat 5/10

12:00 pm-2:30 pm

Nonstop2h 30m

San Juan Luis Munoz Marin Intl

Sun 5/11

8:57 pm-11:47 pm

Nonstop2h 50m

$113

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Thu 5/8

5:35 am-11:40 am

1 stop6h 05m

San Juan Luis Munoz Marin Intl

Sun 5/11

6:15 am-2:54 pm

1 stop8h 39m

$235

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Mon 5/19

7:15 am-9:50 am

Nonstop2h 35m

$47

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Tue 5/6

11:05 am-7:40 pm

1 stop8h 35m

$54

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 5/14

12:45 pm-10:30 pm

1 stop9h 45m

$88

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 5/7

10:37 am-7:48 pm

1 stop9h 11m

$113

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Mon 5/12

10:04 am-12:39 pm

Nonstop2h 35m

$199

MiamiSan Juan

MIA - SJU

MIASJU

Miami

Wed 5/21

1:57 pm-11:57 pm

1 stop10h 00m

$208

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 11 results

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?

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 December is currently the most expensive (average of $336). 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?

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?

Travelers seeking maximum savings on their Key Largo to San Juan flight should consider departing on Tuesday mornings when fares are most often at their lowest. Friday at noon 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

The most flights from KE9 to PR1 are scheduled on a Tuesday (19 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (9 on average).

Rainfall in San Juan 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

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

See what other customers who have flown with Southwest, Delta and United 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

4,295 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

Southwest

8.0

Very good

4,295 reviews

Southwest

8.0

Very good

4,295 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

Delta

8.0

Very good

7,936 reviews

Southwest

8.0

Very good

4,295 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

United Airlines

7.4

Good

8,696 reviews

Southwest

8.0

Very good

4,295 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

JetBlue

7.3

Good

2,922 reviews

Southwest

8.0

Very good

4,295 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,295 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

Related info for your journey

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 $47. Spirit Airlines flights start at $54 while deals on Southwest start at $88 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 Royal Air Maroc (100%), Spirit Airlines (80%) and Frontier (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 $402, our data indicates the cheapest price to be $58. The most popular route (Miami - San Juan Luis Munoz Marin Intl), is priced around $95.
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 December is currently the most expensive (average of $336). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Key Largo to San Juan

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Complete your trip

San Juan car rentals

San Juan Luis Munoz Marin Intl Airport car rentals

Ponce Mercedita Airport car rentals

San Juan Isla Grande Airport car rentals

Vieques Airport car rentals

Aguadilla car rentals

Ponce car rentals

Condado car rentals

Santurce car rentals

Hato Rey Sur car rentals

San Juan Antiguo car rentals

Gobernador Piñero car rentals

Top 6 airlines flying from Key Largo to San Juan

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$47	Average$140	FlexibilityNo cancel fee	On-time62%
Spirit Airlines	Cheapest$62	Average$154	FlexibilityNo cancel fee	On-time65%
JetBlue	Cheapest$83	Average$224	FlexibilityNo cancel fee	On-time62%
Southwest	Cheapest$161	Average$306	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$200	Average$401	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$302	Average$302	FlexibilityNo cancel fee	On-timeN/A

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$47+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Key Largo to San Juan with Cheapflights

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2. Select your favorite providers

3. Compare prices and book

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 Wednesday 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 April 29, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Key Largo to San Juan

Cheapest flights from Key Largo to San JuanExplore 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 April 29, 2025.

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 April 29, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Key Largo to San Juan that are best for you.

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.

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 April 25, 2025.

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

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 April 29, 2025.

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.

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 April 29, 2025.

Rainfall in San Juan by month

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

Temperature in San Juan by month

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

Reviews of airlines servicing San Juan

See what other customers who have flown with Southwest, Delta and United 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.

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?

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

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

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Key Largo to San Juan

See prices for flight routes from nearby airports that may be better suited for you.

Top 6 airlines flying from Key Largo to San Juan

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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 April 29, 2025.