What are the cheapest airlines to fly from Key Largo to San Juan Luis Munoz Marin Intl Airport one-way?

The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $74. 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 San Juan Luis Munoz Marin Intl Airport for a low price.

What are the cheapest flights from Key Largo to San Juan Luis Munoz Marin Intl Airport?

Looking at all options, your cheapest flight can be booked for $65. While the most popular route (Miami - San Juan Luis Munoz Marin Intl) can be booked for $118 on average our data indicates $278 when flying from Key Largo to San Juan Luis Munoz Marin Intl Airport.

What are the most reliable airlines from Key Largo to San Juan Luis Munoz Marin Intl Airport?

Before booking your flight to San Juan Luis Munoz Marin Intl Airport from Key Largo, check out the most reliable airlines to get you to your destination on time: Qatar Airways (88%), Spirit Airlines (84%), Frontier( 84%).

What are the most popular airlines that fly from Key Largo to San Juan Luis Munoz Marin Intl Airport?

Before booking your flight from Key Largo to San Juan Luis Munoz Marin Intl Airport check out the most popular airlines for this route: American Airlines, JetBlue or Delta.

What is the cheapest month to fly from Key Largo to San Juan Luis Munoz Marin Intl Airport?

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 Luis Munoz Marin Intl Airport. Flights to San Juan Luis Munoz Marin Intl Airport from Key Largo in September are about $180 on average during September, but can be found for as low as $59.

Can I find deals for flights from Key Largo to Luis Munoz Marin Intl that include hotel bookings?

Yes. In addition to deals on Key Largo to Luis Munoz Marin Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Key Largo to Luis Munoz Marin Intl?

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

Can I find deals for business class flights from Key Largo to Luis Munoz Marin Intl?

Yes. Cheapflights offers flight deals from Key Largo to Luis Munoz Marin Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$73+ Flights from Key Largo to San Juan Luis Munoz Marin Intl Airport

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Find cheap flights from Key Largo to Luis Munoz Marin Intl 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 Luis Munoz Marin Intl 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 Luis Munoz Marin Intl

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 Luis Munoz Marin Intl

Search Deals

One-way flight from Key Largo to San Juan Luis Munoz Marin Intl

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 Luis Munoz Marin Intl

Cheapest flights from Key Largo to Luis Munoz Marin Intl
Explore the most affordable flight options available from Key Largo to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

Wed 6/256:33 pmMIA - SJU

Nonstop2h 31mSpirit Airlines

Thu 6/267:36 pmSJU - MIA

Nonstop2h 50mSpirit Airlines

Deal found 6/11

$128

Tue 6/243:40 pmMIA - SJU

Nonstop2h 49mMultiple Airlines

Thu 6/267:36 pmSJU - MIA

Nonstop2h 50mMultiple Airlines

Deal found 6/11

$132

Fri 10/314:10 pmMIA - SJU

1 stop7h 48mFrontier

Sat 11/11:11 amSJU - MIA

1 stop22h 50mFrontier

Deal found 6/11

$145

Tue 9/1612:10 pmMIA - SJU

Nonstop2h 43mAmerican Airlines

Mon 9/297:05 pmSJU - MIA

Nonstop2h 45mAmerican Airlines

Deal found 6/11

$240

Best flights from Key Largo to Luis Munoz Marin Intl
Discover carefully curated flight deals from Key Largo to Luis Munoz Marin Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 12, 2025.

Wed 6/256:33 pmMIA - SJU

Nonstop2h 31mSpirit Airlines

Thu 6/267:36 pmSJU - MIA

Nonstop2h 50mSpirit Airlines

Deal found 6/11

$128

Tue 6/243:40 pmMIA - SJU

Nonstop2h 49mMultiple Airlines

Thu 6/267:36 pmSJU - MIA

Nonstop2h 50mMultiple Airlines

Deal found 6/11

$132

Fri 10/314:10 pmMIA - SJU

1 stop7h 48mFrontier

Sat 11/11:11 amSJU - MIA

1 stop22h 50mFrontier

Deal found 6/11

$145

Tue 9/1612:10 pmMIA - SJU

Nonstop2h 43mAmerican Airlines

Mon 9/297:05 pmSJU - MIA

Nonstop2h 45mAmerican Airlines

Deal found 6/11

$240

Last-minute flights from Key Largo to Luis Munoz Marin Intl
Discover last-minute flight deals from Key Largo to Luis Munoz Marin Intl. Data last updated June 12, 2025 and is based on user searches.

Wed 6/183:40 pmMIA - SJU

Nonstop2h 49mFrontier

Tue 6/247:34 pmSJU - MIA

Nonstop2h 54mFrontier

Deal found 6/11

$156

Wed 6/187:10 amMIA - SJU

2 stops11h 55mSouthwest

Wed 6/2511:35 amSJU - MIA

1 stop10h 20mSouthwest

Deal found 6/11

$311

Thu 6/196:33 pmMIA - SJU

Nonstop2h 31mSpirit Airlines

Wed 6/254:45 pmSJU - MIA

Nonstop2h 51mSpirit Airlines

Deal found 6/10

$146

Sat 6/2112:15 pmMIA - SJU

1 stop12h 29mMultiple Airlines

Thu 6/267:36 pmSJU - MIA

Nonstop2h 50mMultiple Airlines

Deal found 6/11

$139

Tue 6/243:40 pmMIA - SJU

Nonstop2h 49mMultiple Airlines

Thu 6/267:36 pmSJU - MIA

Nonstop2h 50mMultiple Airlines

Deal found 6/11

$132

Wed 6/256:33 pmMIA - SJU

Nonstop2h 31mSpirit Airlines

Thu 6/267:36 pmSJU - MIA

Nonstop2h 50mSpirit Airlines

Deal found 6/11

$128

One-way flights from Key Largo to Luis Munoz Marin Intl
Search for one-way flight options from Key Largo to Luis Munoz Marin Intl. Find affordable one-way fares based on user searches. Data last updated June 12, 2025.

Fri 8/227:50 amMIA - SJU

1 stop8h 13mFrontier

Deal found 6/10

$74

Tue 6/176:33 pmMIA - SJU

Nonstop2h 31mSpirit Airlines

Deal found 6/12

$76

Wed 7/1612:00 pmMIA - SJU

1 stop11h 25mSouthwest

Deal found 6/11

$84

Tue 9/93:35 pmMIA - SJU

Nonstop2h 39mAmerican Airlines

Deal found 6/11

$115

Wed 6/252:22 pmMIA - SJU

1 stop9h 35mUnited Airlines

Deal found 6/10

$213

Cheapflights Fare Finder

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

Fly from

Fly to

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 Luis Munoz Marin Intl

Have a flexible travel schedule? Discover the best time to fly to Luis Munoz Marin Intl 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 Luis Munoz Marin Intl Airport

How far ahead should I book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport?

Booking 51 days in advance of your planned departure date is, on average, the best time to get cheap flights from Key Largo to San Juan Luis Munoz Marin Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport?

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

When flying from Key Largo to San Juan Luis Munoz Marin Intl Airport, 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 Luis Munoz Marin Intl Airport?

Travelers seeking maximum savings on their Key Largo to San Juan Luis Munoz Marin Intl Airport 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 Luis Munoz Marin Intl Airport

The most flights from KE9 to SJU 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 Luis Munoz Marin Intl by month

In terms of precipitation, rainfall in San Juan Luis Munoz Marin Intl Airport 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 Luis Munoz Marin Intl Airport when rainfall is around 2.2 in.

Temperature in Luis Munoz Marin Intl by month

If weather is an important factor for your trip to San Juan Luis Munoz Marin Intl Airport, 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 Luis Munoz Marin Intl

Read through reviews of airlines operating flights from Key Largo to San Juan, such as Southwest, United Airlines 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

4,287 reviews

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

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

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

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

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

5.9

Fair

3,295 reviews

Southwest

8.0

Very good

4,287 reviews

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

What are the cheapest airlines to fly from Key Largo to San Juan Luis Munoz Marin Intl Airport one-way?
The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $74. 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 San Juan Luis Munoz Marin Intl Airport for a low price.
What are the most reliable airlines from Key Largo to San Juan Luis Munoz Marin Intl Airport?
Before booking your flight to San Juan Luis Munoz Marin Intl Airport from Key Largo, check out the most reliable airlines to get you to your destination on time: Qatar Airways (88%), Spirit Airlines (84%), Frontier( 84%).
What are the cheapest flights from Key Largo to San Juan Luis Munoz Marin Intl Airport?
Looking at all options, your cheapest flight can be booked for $65. While the most popular route (Miami - San Juan Luis Munoz Marin Intl) can be booked for $118 on average our data indicates $278 when flying from Key Largo to San Juan Luis Munoz Marin Intl Airport.
Can I find deals for flights from Key Largo to Luis Munoz Marin Intl that include hotel bookings?
Yes. In addition to deals on Key Largo to Luis Munoz Marin Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Key Largo to Luis Munoz Marin Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Key Largo to Luis Munoz Marin Intl.
Can I find deals for business class flights from Key Largo to Luis Munoz Marin Intl?
Yes. Cheapflights offers flight deals from Key Largo to Luis Munoz Marin Intl 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 Luis Munoz Marin Intl Airport?
Currently, September is the cheapest month in which you can book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport (average of $254). Flying from Key Largo to San Juan Luis Munoz Marin Intl Airport 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

Dorado

Fajardo

Luquillo

Rio Grande

Humacao

Bayamón

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Top 6 airlines flying from Key Largo to Luis Munoz Marin Intl

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$47	Average$132	FlexibilityNo cancel fee	On-time62%
Spirit Airlines	Cheapest$61	Average$159	FlexibilityNo cancel fee	On-time65%
JetBlue	Cheapest$83	Average$229	FlexibilityNo cancel fee	On-time62%
Southwest	Cheapest$175	Average$306	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$200	Average$403	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$302	Average$302	FlexibilityNo cancel fee	On-timeN/A

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$73+ Cheap flights from Key Largo, FL to Luis Munoz Marin Intl (SJU)

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.

Find cheap flights from Key Largo to Luis Munoz Marin Intl with Cheapflights

1. Tell us where you want to go

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3. Compare prices and book

Cheapflights Tip: The best prices from Key Largo to San Juan Luis Munoz Marin Intl 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 Luis Munoz Marin Intl

Keep the following information in mind while searching for Key Largo to Luis Munoz Marin Intl flight deals. Data was last updated June 12, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Key Largo to Luis Munoz Marin Intl

Cheapest flights from Key Largo to Luis Munoz Marin IntlExplore the most affordable flight options available from Key Largo to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

Explore the most affordable flight options available from Key Largo to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Key Largo to Luis Munoz Marin Intl

Have a flexible travel schedule? Discover the best time to fly to Luis Munoz Marin Intl from Key Largo with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Key Largo to San Juan Luis Munoz Marin Intl Airport

How far ahead should I book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Luis Munoz Marin Intl. Price data was last updated on June 9, 2025.

What is the cheapest month to book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport?

What is the cheapest time of day to fly from KE9 to SJU?

Find hourly flight availability from Key Largo to Luis Munoz Marin Intl. 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.

What is the cheapest day to fly from Key Largo to San Juan Luis Munoz Marin Intl Airport?

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

Weekly flight availability from Key Largo to San Juan Luis Munoz Marin Intl Airport

Rainfall in Luis Munoz Marin Intl by month

Plan your trip to Luis Munoz Marin Intl by taking into account the average rainfall totals by month.

Temperature in Luis Munoz Marin Intl by month

Plan your trip to Luis Munoz Marin Intl by taking into account the average temperature totals by month.

Reviews of airlines servicing Luis Munoz Marin Intl

Read through reviews of airlines operating flights from Key Largo to San Juan, such as Southwest, United Airlines and American Airlines. Reviews also offer insight into each airline's 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 Luis Munoz Marin Intl. 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 Luis Munoz Marin Intl Airport one-way?

What are the most reliable airlines from Key Largo to San Juan Luis Munoz Marin Intl Airport?

What are the cheapest flights from Key Largo to San Juan Luis Munoz Marin Intl Airport?

Can I find deals for flights from Key Largo to Luis Munoz Marin Intl that include hotel bookings?

How can I find direct flights from Key Largo to Luis Munoz Marin Intl?

Can I find deals for business class flights from Key Largo to Luis Munoz Marin Intl?

What is the cheapest month to book a flight from Key Largo to San Juan Luis Munoz Marin Intl Airport?

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Alternative routes for Key Largo to Luis Munoz Marin Intl

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Top 6 airlines flying from Key Largo to Luis Munoz Marin Intl

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Cheapest flights from Key Largo to Luis Munoz Marin Intl
Explore the most affordable flight options available from Key Largo to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.