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Key Largo

$96+ Cheap flights from Louisville (SDF) to Key Largo, FL

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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — MIA
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
1 adult, Economy
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Find cheap flights from Louisville to Key Largo with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Louisville Intl to Key Largo are usually found in August or July, booked 36 days in advance, depart on a Friday or Tuesday and return on a Wednesday

Cheap flight deals from Louisville to Key Largo

Cheapest flights from Louisville to Key Largo
Explore the most affordable flight options available from Louisville to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 23, 2025.

This Delta deal was found by Cheapflights users on 12/21. 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.
Wed 12/248:30 amSDF - MIA
1 stop7h 24mDelta
Thu 12/256:00 amMIA - SDF
1 stop6h 51mDelta
Deal found 12/21$261
This Southwest deal was found by Cheapflights users on 12/21. 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.
Wed 12/315:10 pmSDF - MIA
1 stop4h 40mSouthwest
Sat 1/107:00 amMIA - SDF
1 stop5h 35mSouthwest
Deal found 12/21$265
This American Airlines deal was found by Cheapflights users on 12/21. 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.
Wed 12/315:00 amSDF - MIA
Nonstop2h 39mAmerican Airlines
Sat 1/107:07 amMIA - SDF
1 stop5h 18mAmerican Airlines
Deal found 12/21$283
This Delta deal was found by Cheapflights users on 12/21. 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.
Wed 12/248:30 amSDF - MIA
1 stop7h 24mDelta
Wed 12/315:01 pmMIA - SDF
1 stop6h 55mDelta
Deal found 12/21$293
This American Airlines deal was found by Cheapflights users on 12/21. 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.
Tue 12/236:01 amSDF - MIA
Nonstop2h 43mAmerican Airlines
Tue 12/309:20 pmMIA - SDF
Nonstop2h 39mAmerican Airlines
Deal found 12/21$305
This Delta deal was found by Cheapflights users on 12/21. 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.
Wed 12/2410:14 amSDF - MIA
1 stop5h 40mDelta
Fri 12/2610:34 amMIA - SDF
1 stop7h 32mDelta
Deal found 12/21$322
This Delta deal was found by Cheapflights users on 12/22. 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.
Tue 12/2310:14 amSDF - MIA
1 stop7h 04mDelta
Sat 12/278:45 amMIA - SDF
1 stop7h 14mDelta
Deal found 12/22$325
This Kiwi.com deal was found by Cheapflights users on 12/23. 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.
Tue 12/302:55 pmSDF - MIA
1 stop5h 34mMultiple Airlines
Tue 1/67:09 pmMIA - SDF
2 stops28h 50mMultiple Airlines
Deal found 12/23$328
This American Airlines deal was found by Cheapflights users on 12/22. 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.
Tue 12/236:01 amSDF - MIA
Nonstop2h 43mAmerican Airlines
Sun 12/289:20 pmMIA - SDF
Nonstop2h 39mAmerican Airlines
Deal found 12/22$334

Find flight deals from Louisville to Key Largo

Keep the following information in mind while searching for Louisville to Key Largo flight deals. Data was last updated December 23, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$179
(American Airlines)

One-way from

$96
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$447
Provider with most accurate pricing for Louisville Intl-Miami flight deals.
Search Deals
Provider most trusted by Cheapflights users for Louisville Intl-Miami flights.
Search Deals
From Louisville Intl to Key Largo
Search Deals
One-way flight from Louisville Intl to Key Largo
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Louisville to Key Largo 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 December 23, 2025.
Use the filters below to find and compare flights from Louisville to Key Largo that are best for you.

Fly from

Louisville

Fly to

Key Largo

Route

Depart

Return

Price

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Tue 2/17

5:45 pm-9:55 pm

1 stop4h 10m

Miami

Thu 2/19

4:40 pm-11:00 pm

1 stop6h 20m

$199

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Mon 2/2

10:41 am-5:45 pm

1 stop7h 04m

Miami

Tue 2/10

7:00 pm-11:50 pm

1 stop4h 50m

$199

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 1/21

3:32 pm-9:41 pm

1 stop6h 09m

Miami

Wed 1/28

5:50 am-11:37 am

1 stop5h 47m

$199

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 1/21

5:35 am-11:20 am

1 stop5h 45m

Miami

Wed 1/28

6:55 am-11:10 am

1 stop4h 15m

$199

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 2/18

5:45 pm-10:00 pm

1 stop4h 15m

Miami

Wed 2/25

5:20 pm-9:50 pm

1 stop4h 30m

$199

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Sat 2/7

5:47 pm-12:51 am

1 stop7h 04m

Miami

Sat 2/14

7:20 pm-11:58 pm

1 stop4h 38m

$199

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Mon 2/2

12:50 pm-6:35 pm

1 stop5h 45m

Miami

Tue 2/10

12:55 pm-10:10 pm

2 stops9h 15m

$235

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 2/11

6:00 am-8:55 am

Nonstop2h 55m

Miami

Tue 2/17

9:15 pm-11:59 pm

Nonstop2h 44m

$242

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Thu 1/29

2:30 pm-9:00 pm

1 stop6h 30m

Miami

Tue 2/3

7:15 am-1:35 pm

1 stop6h 20m

$249

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 1/21

5:35 am-11:20 am

1 stop5h 45m

Miami

Mon 2/2

4:30 pm-10:45 pm

1 stop6h 15m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/22

Showing 1-10 of 19 results
1
2

Best time to book a flight from Louisville to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo 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 Key Largo

How far ahead should I book a flight from Louisville to Key Largo?

Use this chart to determine the optimal time to book a round-trip flight from Louisville to Key Largo. Price data was last updated on December 19, 2025.

The price you pay for your flight from Louisville to Key Largo may vary depending on when you book. For the best chance of a lower fare, look to book 36 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 Louisville to Key Largo?

Currently, April is the cheapest month in which you can book a flight from Louisville to Key Largo (average of $57). Flying from Louisville to Key Largo in June is currently the most expensive (average of $76). 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 KE9?

Find hourly flight availability from Louisville to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 23, 2025.

It’s optimal to fly from Louisville to Key Largo in the evening. By choosing this option you can save up to 13% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from Louisville to Key Largo?

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

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

Reviews of airlines servicing Key Largo

Get insights into the airlines that provide service to Key Largo. 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 Key Largo. Reviews last updated December 23, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Louisville to Key Largo 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
4,253 reviews

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,253 reviews
Southwest
8.0
Very good
4,253 reviews

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,014 reviews
Southwest
8.0
Very good
4,253 reviews

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,105 reviews
Southwest
8.0
Very good
4,253 reviews

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,054 reviews
Southwest
8.0
Very good
4,253 reviews

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Spirit Airlines
6.3
Okay
8,196 reviews
Southwest
8.0
Very good
4,253 reviews

Overall

8.0

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from Louisville to Key Largo. 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 Key Largo?

    Most people fly from Louisville Intl (SDF) if they book a flight from Louisville to Key Largo. On average, Louisville Intl has 0 outbound flights to Key Largo per day from 6 airlines. Louisville Intl is conveniently located just 5.3 mi from Louisville’s city center.

  • How popular is this Louisville to Key Largo flight route?

    Flights from Louisville Intl to Key Largo have been viewed 18 times in the past calendar month.

  • How long is the flight from Louisville to Key Largo?

    Airlines like Southwest and Delta fly from Louisville to Key Largo in about 4h 10m. The time it takes to get you to your destination can typically vary by up to 2h 54m. Louisville and Key Largo are separated by a distance of 912 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Louisville to Key Largo one-way?

    To fly one-way, consider booking your trip with Allegiant Air, which is currently one of the cheapest options available, starting at $42. Spirit Airlines flights start at $49 while deals on American Airlines start at $88 one-way.

  • What are the most reliable airlines from Louisville to Key Largo?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Louisville to Key Largo on time: Qatar Airways (83%), American Airlines (78%), Sun Country Air (0%).

  • What are the cheapest flights from Louisville to Key Largo?

    While on average a flight from Louisville to Key Largo is generally $353, our data shows the cheapest flight currently is $230. When looking at the most popular route, (Louisville Intl - Miami), you can expect to pay $199 for that flight.

  • Can I find deals for flights from Louisville to Key Largo that include hotel bookings?

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

  • How can I find direct flights from Louisville to Key Largo?

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

  • Can I find deals for business class flights from Louisville to Key Largo?

    Yes. Cheapflights offers flight deals from Louisville to Key Largo 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 Key Largo?

    Currently, April is the cheapest month in which you can book a flight from Louisville to Key Largo (average of $57). Flying from Louisville to Key Largo in June is currently the most expensive (average of $76). 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.

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Top 6 airlines flying from Louisville to Key Largo

Discover the top 6 airlines that operate flights from Louisville to Key Largo. 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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$76Average$120FlexibilityNo cancel feeOn-time88%
Spirit AirlinesCheapest$85Average$176FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$196Average$391FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$198Average$371FlexibilityNo cancel feeOn-time63%
DeltaCheapest$198Average$362FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$228Average$395FlexibilityNo cancel feeOn-time69%

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