HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Juan

$103+ 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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — SJU
ago. 3 — ago. 101
dom. 8/3
dom. 8/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Louisville 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.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Louisville Intl to San Juan are usually found in October or January, booked 12 days in advance, depart on a Tuesday or Sunday and return on a Thursday

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 julio 29, 2025.

Round-trip from

$205
(American Airlines)

One-way from

$103
(Delta)

Popular in

March

Cheapest in

October

Average price

$452
From Louisville Intl to San Juan
Search Deals
One-way flight from Louisville Intl to San Juan
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

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 julio 29, 2025.

This American Airlines deal was found by Cheapflights users on 7/27. 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.
lun. 10/133:35 pmSDF - SJU
1 stop8h 24mAmerican Airlines
mar. 10/282:35 pmSJU - SDF
1 stop10h 00mAmerican Airlines
Deal found 7/27$205
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.
sáb. 9/68:30 amSDF - SJU
1 stop26h 34mSpirit Airlines
vie. 9/1211:59 amSJU - SDF
1 stop10h 29mSpirit Airlines
Deal found 7/29$226
This Southwest deal was found by Cheapflights users on 7/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/264:20 pmSDF - SJU
1 stop7h 10mSouthwest
lun. 9/295:50 amSJU - SDF
1 stop6h 40mSouthwest
Deal found 7/27$245
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/77:20 amSDF - SJU
1 stop7h 24mUnited Airlines
vie. 9/121:05 amSJU - SDF
2 stops12h 12mUnited Airlines
Deal found 7/29$288
This Delta deal was found by Cheapflights users on 7/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/76:00 amSDF - SJU
1 stop10h 36mDelta
jue. 9/185:41 pmSJU - SDF
1 stop6h 11mDelta
Deal found 7/28$300

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 julio 29, 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

lun. 10/13

3:35 pm-11:59 pm

1 stop8h 24m

San Juan Luis Munoz Marin Intl

mar. 10/28

2:35 pm-12:35 am

1 stop10h 00m

$205

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

sáb. 9/6

8:30 am-11:04 am

1 stop26h 34m

San Juan Luis Munoz Marin Intl

vie. 9/12

11:59 am-10:28 pm

1 stop10h 29m

$226

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

vie. 9/26

4:20 pm-11:30 pm

1 stop7h 10m

San Juan Luis Munoz Marin Intl

lun. 9/29

5:50 am-12:30 pm

1 stop6h 40m

$245

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

dom. 9/7

7:20 am-2:44 pm

1 stop7h 24m

San Juan Luis Munoz Marin Intl

vie. 9/12

1:05 am-1:17 pm

2 stops12h 12m

$288

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

dom. 9/7

3:10 pm-2:11 pm

3 stops23h 01m

San Juan Luis Munoz Marin Intl

jue. 9/11

3:19 pm-8:57 am

2 stops17h 38m

$298

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

dom. 9/7

6:00 am-4:36 pm

1 stop10h 36m

San Juan Luis Munoz Marin Intl

jue. 9/18

5:41 pm-11:52 pm

1 stop6h 11m

$300

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

mar. 8/26

8:10 am-4:36 pm

1 stop8h 26m

$103

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

sáb. 1/17

3:17 pm-12:36 am

1 stop8h 19m

$122

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

lun. 8/25

10:50 am-10:49 pm

1 stop11h 59m

$133

LouisvilleSan Juan

SDF - SJU

SDFSJU

Louisville Intl

lun. 10/6

8:30 am-2:11 pm

2 stops29h 41m

$150

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

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 July 25, 2025.

To ensure you get the cheapest price possible for a flight from Louisville to San Juan, you should look to book at least 12 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, September is the cheapest month in which you can book a flight from Louisville to San Juan (average of $254). Flying from Louisville 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 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 julio 29, 2025.

It’s optimal to fly from Louisville to San Juan in the evening. By choosing this option you can save up to 25% 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 September 29, 2024.

Travelers seeking maximum savings on their Louisville to San Juan flight should consider departing on Thursday evenings when fares are most often at their lowest. Tuesday 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 julio 29, 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
4,238 reviews

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

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
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

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
7,979 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

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.
United Airlines
7.4
Good
8,896 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

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
4,238 reviews

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

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
8,044 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

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 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.

  • 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 $205. Other airlines that can offer you cheap pricing are Spirit Airlines, from $226, and Southwest, from $245. American Airlines is 53% 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 $103. However, be on the lookout for offers from United Airlines and American 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, September is the cheapest month in which you can book a flight from Louisville to San Juan (average of $254). Flying from Louisville 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

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.

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 julio 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$152Average$294FlexibilityNo cancel feeOn-time65%
SouthwestCheapest$225Average$492FlexibilityNo cancel feeOn-time63%
DeltaCheapest$225Average$401FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$275Average$559FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$276Average$472FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.