The cheapest times to fly from SDF to SJU are

  • January 8th to February 25th (except the week of February 12th)
  • May 14th to June 24th (except the week of May 21st)
  • early to mid July
  • August 6th to November 18th (except the weeks of August 20th and August 27th)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from SDF to SJU is late October. Prices can be as high as $1078 for Sunday flights during late December, or as low as $378 for Tuesday flights around late October.


When to Fly to San Juan

Flying from Louisville, KY (SDF) to San Juan, PR (SJU) will usually cost between $379 to $786 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late October with an average ticket price of $412. Due to high demand the most expensive time to fly is late December, with an average price of $767. Planning your trip to low-cost times can easily save you $355 on economy flights and even more on first-class flights. Generally, any price below $449 can be considered a good price for a round-trip SDF to SJU flight.

See below for a graph of average weekly prices for the SDF to SJU route. All prices are for round-trip tickets in USD.

SDF to SJU Flight Prices

Compared to other flights, the SDF to SJU flight is much cheaper than the average and costs less than the average flight leaving from Louisville. The average price per mile (for a direct flight) is $0.15, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $197 (33%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $402. Return trip prices are from the SJU to SDF flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from SDF to SJU can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 4 hour 14 minutes may not be realistic.


Flight Hacking SDF to SJU

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from SDF to SJU — but Champion Traveler does!

Hack #1: Sanford, FL (SDF > SFB > SJU)

  • Price for both tickets: $429
  • Average savings: $20 (4.45%)

See SDF to SFB flights


Flight Questions Answered

Still have questions about flying from SDF to SJU? We’ve got answers.

Which airlines fly this route?

You can find 7 major airlines flying this route most often: American, Cape Air, Delta, Frontier, Seaborne Airlines, Southwest, United, and potentially more during busy seasons.

How far away is it from Luis Munoz Marin International Airport to Louisville International-Standiford Field Airport?

The distance between the two airports is roughly 1808 miles or 2910 kilometers.

How long does it take to fly from SDF to SJU?

The real-world flight time for a nonstop SDF to SJU flight is about 4 hour 14 minutes.

How many flights go between Louisville, KY and San Juan, PR?

It depends on the day of the week and the date, but a typical day might have around 87 available flights from SDF to SJU.


Airport Location Info


Departing Airport

Origination code SDF
Origination airport name Louisville International-Standiford Field Airport
City Louisville, KY
Country the United States
Latitude 38.2
Longitude -85.7

Return Airport

Destination code SJU
Destination airport name Luis Munoz Marin International Airport
City San Juan, PR
Country the United States
Latitude 18.4
Longitude -66


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.