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San Juan

$113+ Cheap flights from Louisville (SDF) 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 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — SJU
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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Cheapflights Tip: The best prices from Louisville Intl to San Juan are usually found in September or October, booked 66 days in advance, depart on a Tuesday or Sunday and return on a Thursday

Find flight deals from Louisville to San Juan

Cheapest flights from Louisville to San Juan
Explore the most affordable flight options available from Louisville to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 28, 2025.

This American Airlines deal was found by Cheapflights users on 10/27. 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.
Fri 11/147:13 pmSDF - SJU
1 stop16h 52mAmerican Airlines
Wed 11/196:25 amSJU - SDF
1 stop16h 15mAmerican Airlines
Deal found 10/27$265
This American Airlines deal was found by Cheapflights users on 10/26. 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.
Fri 12/58:47 amSDF - SJU
1 stop12h 22mAmerican Airlines
Mon 12/86:25 amSJU - SDF
1 stop16h 17mAmerican Airlines
Deal found 10/26$285
This American Airlines deal was found by Cheapflights users on 10/26. 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.
Sun 11/27:31 pmSDF - SJU
1 stop17h 07mAmerican Airlines
Sat 11/88:00 amSJU - SDF
2 stops9h 55mAmerican Airlines
Deal found 10/26$305
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 11/206:48 pmSDF - SJU
1 stop27h 56mMultiple Airlines
Mon 11/245:19 pmSJU - SDF
1 stop25h 34mMultiple Airlines
Deal found 10/26$346
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/87:00 amSDF - SJU
2 stops13h 26mUnited Airlines
Sat 11/158:30 amSJU - SDF
2 stops9h 46mUnited Airlines
Deal found 10/27$351
This American Airlines deal was found by Cheapflights users on 10/26. 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.
Fri 12/128:47 amSDF - SJU
1 stop12h 22mAmerican Airlines
Sun 12/216:00 amSJU - SDF
1 stop8h 18mAmerican Airlines
Deal found 10/26$374
This American Airlines deal was found by Cheapflights users on 10/26. 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 12/137:00 amSDF - SJU
1 stop15h 52mAmerican Airlines
Thu 12/182:31 pmSJU - SDF
1 stop10h 28mAmerican Airlines
Deal found 10/26$378
This Southwest deal was found by Cheapflights users on 10/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/81:10 pmSDF - SJU
2 stops10h 20mSouthwest
Tue 11/115:45 amSJU - SDF
2 stops12h 25mSouthwest
Deal found 10/26$380
This American Airlines deal was found by Cheapflights users on 10/26. 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 11/156:24 amSDF - SJU
1 stop14h 00mAmerican Airlines
Tue 11/186:25 amSJU - SDF
2 stops10h 04mAmerican Airlines
Deal found 10/26$382

Cheap flight deals from Louisville to San Juan

Discover tips and strategies to find the most affordable flight options for your journey from Louisville (SDF) to San Juan (PR1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 28, 2025.

Round-trip from

$225
(Delta)

One-way from

$113
(Delta)

Popular in

December

Cheapest in

September

Average price

$344
From Louisville Intl to San Juan
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One-way flight from Louisville Intl to San Juan
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Highest demand for flights based on searches. 5% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Louisville 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 October 28, 2025.
Use the filters below to find and compare flights from Louisville to San Juan that are best for you.

Fly from

Louisville

Fly to

San Juan

Route

Depart

Return

Price

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

Sun 2/1

6:28 am-2:40 pm

1 stop7h 12m

San Juan Luis Munoz Marin Intl

Thu 2/5

8:10 am-8:28 pm

2 stops13h 18m

$225

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

Tue 1/20

3:32 pm-11:44 pm

1 stop7h 12m

San Juan Luis Munoz Marin Intl

Tue 1/27

6:27 pm-11:50 pm

1 stop6h 23m

$265

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

Tue 3/3

1:50 pm-12:36 am

1 stop9h 46m

San Juan Luis Munoz Marin Intl

Wed 3/4

8:10 am-8:14 pm

2 stops13h 04m

$310

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

Thu 1/29

7:00 am-11:56 pm

1 stop15h 56m

San Juan Luis Munoz Marin Intl

Sat 2/7

7:00 am-9:16 pm

1 stop15h 16m

$325

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

Tue 2/24

5:35 am-9:26 pm

2 stops14h 51m

San Juan Luis Munoz Marin Intl

Tue 3/3

2:05 am-1:28 pm

2 stops12h 23m

$375

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

Wed 2/18

5:45 pm-12:35 am

1 stop5h 50m

San Juan Luis Munoz Marin Intl

Sun 2/22

6:00 am-6:05 pm

1 stop13h 05m

$382

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

Sun 1/11

3:37 pm-11:44 pm

1 stop7h 07m

$113

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

Mon 1/12

6:00 am-5:03 pm

1 stop10h 03m

$113

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

Sun 1/11

6:12 pm-6:11 am

2 stops10h 59m

$138

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

Fri 1/9

10:55 am-11:49 pm

1 stop11h 54m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

Showing 1-10 of 17 results
1
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Best time to book a flight from Louisville to San Juan

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

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

Use this chart to determine the optimal time to book a round-trip flight from Louisville to San Juan. Price data was last updated on October 24, 2025.

To ensure you get the cheapest price possible for a flight from Louisville to San Juan, you should look to book at least 66 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, January is the cheapest month in which you can book a flight from Louisville to San Juan (average of $128). Flying from Louisville to San Juan in June is currently the most expensive (average of $244). 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 SDF to SJU?

Find hourly flight availability from Louisville 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 October 28, 2025.

It’s optimal to fly from Louisville to San Juan in the morning. By choosing this option you can save up to 31% on the cost of your flight, compared to a flight in the afternoon.

What is the cheapest day to fly from Louisville to San Juan?

Use this chart to determine the cheapest time to fly round-trip from Louisville to San Juan. Price data was last updated on November 18, 2024.

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

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 October 28, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Louisville to San Juan by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,240 reviews
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
7.9
Good
7,994 reviews
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
9,001 reviews
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,032 reviews
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Spirit Airlines
6.3
Okay
8,116 reviews
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Louisville 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 airport do you fly from for flights from Louisville to San Juan?

    Most people fly from Louisville Intl (SDF) if they book a flight from Louisville to San Juan. On average, Louisville Intl has 0 outbound flights to San Juan per day from 5 airlines. Louisville Intl is conveniently located just 5.3 mi from Louisville’s city center.

  • How long is the flight from Louisville to San Juan?

    A quick flight from Louisville to San Juan can take about 7h 12m. United Airlines provides one of the quickest options available for as low as $225. There are 1807 mi between Louisville and San Juan.

  • What are the cheapest airlines flying from Louisville to San Juan round-trip?

    Cheapflights users have booked flights from Louisville to San Juan round-trip from $152. Other airlines that can offer you cheap pricing are Delta, from $225, and Southwest, from $225. Spirit Airlines is 64% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Louisville to San Juan one-way?

    The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as $113. However, be on the lookout for offers from American Airlines and United Airlines, as they are both options that can get you from Louisville to San Juan for a low price.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Louisville 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 Louisville to San Juan?

    Currently, January is the cheapest month in which you can book a flight from Louisville to San Juan (average of $128). Flying from Louisville to San Juan in June is currently the most expensive (average of $244). 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

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Top 5 airlines flying from Louisville to San Juan

Discover the top 5 airlines that operate flights from Louisville 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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$152Average$300FlexibilityNo cancel feeOn-time65%
SouthwestCheapest$225Average$474FlexibilityNo cancel feeOn-time63%
DeltaCheapest$225Average$388FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$257Average$452FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$275Average$651FlexibilityNo cancel feeOn-time69%

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