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Key Largo

$90+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — MIA
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheapflights Tip: The best prices from Louisville Intl to Key Largo are usually found in August or February, booked 88 days in advance, depart on a Friday or Tuesday and return on a Thursday

Cheap 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 September 16, 2025.

Round-trip from

$159
(American Airlines)

One-way from

$90
(Southwest)

Popular in

December

Cheapest in

August

Average price

$318
From Louisville Intl to Key Largo
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One-way flight from Louisville Intl to Key Largo
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Highest demand for flights based on searches. 4% potential increase in price ($17 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 16, 2025.

This American Airlines deal was found by Cheapflights users on 9/13. 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 10/226:00 amSDF - MIA
Nonstop2h 35mAmerican Airlines
Wed 10/299:58 pmMIA - SDF
Nonstop2h 38mAmerican Airlines
Deal found 9/13$159
This American Airlines deal was found by Cheapflights users on 9/15. 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 10/296:00 amSDF - MIA
Nonstop2h 35mAmerican Airlines
Sat 11/19:58 pmMIA - SDF
Nonstop2h 38mAmerican Airlines
Deal found 9/15$169
This Southwest deal was found by Cheapflights users on 9/14. 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.
Tue 10/143:50 pmSDF - MIA
1 stop5h 15mSouthwest
Wed 10/1511:45 amMIA - SDF
1 stop6h 20mSouthwest
Deal found 9/14$179
This Southwest deal was found by Cheapflights users on 9/15. 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.
Tue 11/1111:45 amSDF - MIA
2 stops10h 05mSouthwest
Tue 11/187:10 amMIA - SDF
2 stops10h 00mSouthwest
Deal found 9/15$189
This Southwest deal was found by Cheapflights users on 9/16. 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.
Mon 11/311:45 amSDF - MIA
2 stops10h 05mSouthwest
Fri 11/76:00 amMIA - SDF
1 stop6h 20mSouthwest
Deal found 9/16$190
This Southwest deal was found by Cheapflights users on 9/15. 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.
Sun 10/1212:50 pmSDF - MIA
1 stop10h 00mSouthwest
Fri 10/177:20 amMIA - SDF
1 stop6h 55mSouthwest
Deal found 9/15$194
This Delta deal was found by Cheapflights users on 9/14. 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 11/46:00 amSDF - MIA
1 stop5h 08mDelta
Tue 11/186:00 amMIA - SDF
1 stop6h 07mDelta
Deal found 9/14$197
This Delta deal was found by Cheapflights users on 9/14. 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 10/810:30 amSDF - MIA
1 stop6h 00mDelta
Tue 10/216:15 pmMIA - SDF
1 stop5h 46mDelta
Deal found 9/14$198
This American Airlines deal was found by Cheapflights users on 9/14. 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 12/106:00 amSDF - MIA
Nonstop2h 37mAmerican Airlines
Mon 12/155:33 pmMIA - SDF
1 stop4h 17mAmerican Airlines
Deal found 9/14$207
This American Airlines deal was found by Cheapflights users on 9/14. 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 11/186:00 amSDF - MIA
Nonstop2h 34mAmerican Airlines
Sat 11/229:02 pmMIA - SDF
Nonstop2h 41mAmerican Airlines
Deal found 9/14$215
This Southwest deal was found by Cheapflights users on 9/15. 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.
Thu 11/64:45 pmSDF - MIA
1 stop6h 40mSouthwest
Wed 11/126:55 amMIA - SDF
1 stop4h 15mSouthwest
Deal found 9/15$217

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 September 16, 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 10/14

1:00 pm-9:55 pm

2 stops8h 55m

Miami

Wed 10/15

7:55 am-1:00 pm

1 stop5h 05m

$184

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 11/5

10:30 am-4:30 pm

1 stop6h 00m

Miami

Thu 11/13

6:23 pm-12:06 am

1 stop5h 43m

$197

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Tue 11/4

7:09 am-11:08 am

1 stop3h 59m

Miami

Wed 11/19

4:52 pm-12:06 am

1 stop7h 14m

$197

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Mon 11/10

6:16 pm-12:48 am

1 stop6h 32m

Miami

Sat 11/15

6:00 am-11:12 am

1 stop5h 12m

$197

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 12/3

2:29 pm-9:42 pm

1 stop7h 13m

Miami

Thu 12/18

8:05 am-2:13 pm

1 stop6h 08m

$197

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Mon 10/13

5:20 pm-10:05 pm

1 stop4h 45m

Miami

Mon 10/20

6:25 am-12:35 pm

1 stop6h 10m

$217

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Sat 11/1

12:20 pm-9:50 pm

1 stop9h 30m

Miami

Sat 11/8

6:25 am-12:35 pm

1 stop6h 10m

$222

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 11/5

10:30 am-4:30 pm

1 stop6h 00m

Miami

Mon 11/17

7:25 pm-12:06 am

1 stop4h 41m

$226

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Sun 11/9

7:59 pm-12:48 am

1 stop4h 49m

Miami

Sat 11/15

7:00 am-2:08 pm

1 stop7h 08m

$228

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Tue 12/2

10:37 am-3:50 pm

1 stop5h 13m

Miami

Wed 12/17

4:55 pm-12:05 am

1 stop7h 10m

$244

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 22 results
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2
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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 September 12, 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 88 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, September is the cheapest month in which you can book a flight from Louisville to Key Largo (average of $232). Flying from Louisville to Key Largo in March is currently the most expensive (average of $289). 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 September 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Louisville to Key Largo as you normally would.

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 Tuesday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Louisville to Key Largo

Explore weekly flight availability from Louisville to Key Largo. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 16, 2025.

The most flights from SDF to KE9 are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

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 September 16, 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
4,242 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

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
8.0
Very good
7,957 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

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
8,924 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

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
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

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
8,019 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

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 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 2 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 4 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 6h. The time it takes to get you to your destination can typically vary by up to 2h 55m. Louisville and Key Largo are separated by a distance of 912 mi. This flight may include one or multiple stops.

  • 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 (73%), Envoy Air (71%), American Airlines (69%).

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

    While on average a flight from Louisville to Key Largo is generally $784, our data shows the cheapest flight currently is $104. When looking at the most popular route, (Louisville Intl - Miami), you can expect to pay $179 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, September is the cheapest month in which you can book a flight from Louisville to Key Largo (average of $232). Flying from Louisville to Key Largo in March is currently the most expensive (average of $289). 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$76Average$131FlexibilityNo cancel feeOn-time88%
Spirit AirlinesCheapest$85Average$173FlexibilityNo cancel feeOn-time65%
DeltaCheapest$198Average$371FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$199Average$396FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$207Average$387FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$258Average$377FlexibilityNo cancel feeOn-time69%

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