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Key Largo

$128+ 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 7/22. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — MIA
Jun 26 — Jul 31
Fri 6/26
Fri 7/3
1 adult, Economy
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Cheapflights Tip: The best prices from Louisville Intl to Key Largo are usually found in August or September, booked 88 days in advance, depart on a Friday or Saturday and return on a Friday

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 May 27, 2026.

This Southwest deal was found by Cheapflights users on 5/26. 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.
Tue 6/25:50 pm
SDF
-
MIA
1 stop4h 05m
Southwest
Tue 6/96:00 am
MIA
-
SDF
1 stop4h 10m
Southwest
Deal found 5/26$267
This Kiwi.com deal was found by Cheapflights users on 5/26. 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.
Wed 8/262:56 pm
SDF
-
MIA
1 stop19h 20m
Multiple Airlines
Sun 8/305:05 am
MIA
-
SDF
2 stops13h 10m
Multiple Airlines
Deal found 5/26$284
This Southwest deal was found by Cheapflights users on 5/26. 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.
Sun 5/316:20 pm
SDF
-
MIA
1 stop4h 25m
Southwest
Wed 6/37:00 am
MIA
-
SDF
1 stop4h 20m
Southwest
Deal found 5/26$299
This Kiwi.com deal was found by Cheapflights users on 5/26. 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.
Wed 9/22:56 pm
SDF
-
MIA
1 stop19h 20m
Multiple Airlines
Sun 9/65:05 am
MIA
-
SDF
2 stops13h 10m
Multiple Airlines
Deal found 5/26$301
This Kiwi.com deal was found by Cheapflights users on 5/26. 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.
Sat 7/118:06 pm
SDF
-
MIA
1 stop24h 24m
Multiple Airlines
Fri 7/172:56 pm
MIA
-
SDF
1 stop17h 40m
Multiple Airlines
Deal found 5/26$309
This American Airlines deal was found by Cheapflights users on 5/26. 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.
Wed 8/126:25 am
SDF
-
MIA
Nonstop2h 36m
American Airlines
Wed 8/198:00 pm
MIA
-
SDF
Nonstop2h 37m
American Airlines
Deal found 5/26$315
This American Airlines deal was found by Cheapflights users on 5/26. 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.
Wed 9/96:00 am
SDF
-
MIA
Nonstop2h 32m
American Airlines
Sat 9/199:05 pm
MIA
-
SDF
Nonstop2h 44m
American Airlines
Deal found 5/26$318
This Southwest deal was found by Cheapflights users on 5/26. 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.
Tue 6/95:35 am
SDF
-
MIA
2 stops10h 15m
Southwest
Tue 6/161:45 pm
MIA
-
SDF
2 stops8h 45m
Southwest
Deal found 5/26$322

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 May 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$267
(Southwest)

One-way from

$128
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$385
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. 4% potential increase in price ($17 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
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 May 27, 2026.
Use the filters below to find and compare flights from Louisville to Key Largo that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Mon 7/6

5:50 am-11:00 am

1 stop5h 10m

Miami

Sat 7/11

5:40 am-4:35 pm

1 stop10h 55m

$341
Quickest round-trip

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Sat 7/18

5:05 pm-10:30 pm

1 stop5h 25m

Miami

Mon 7/27

5:25 am-10:10 am

1 stop4h 45m

$368

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 6/17

4:15 pm-9:20 pm

1 stop5h 05m

Miami

Sun 6/21

6:20 am-12:25 pm

1 stop6h 05m

$375

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Tue 6/9

5:35 am-3:50 pm

2 stops10h 15m

Miami

Fri 6/12

6:20 am-12:30 pm

1 stop6h 10m

$375

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Thu 8/6

3:20 pm-8:45 pm

1 stop5h 25m

Miami

Sun 8/9

6:45 am-3:30 pm

2 stops8h 45m

$378

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Fri 7/24

3:00 pm-12:30 am

1 stop9h 30m

Miami

Fri 7/31

5:25 am-10:10 am

1 stop4h 45m

$378

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Thu 6/11

5:05 pm-11:15 pm

1 stop6h 10m

Miami

Mon 6/15

6:20 am-12:30 pm

1 stop6h 10m

$407

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Fri 8/21

3:20 pm-8:45 pm

1 stop5h 25m

Miami

Mon 8/24

5:05 pm-10:35 pm

1 stop5h 30m

$412

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Sun 5/31

3:50 pm-10:45 pm

2 stops6h 55m

Miami

Thu 6/4

6:50 pm-12:25 am

1 stop5h 35m

$412

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Fri 6/26

5:05 pm-11:15 pm

1 stop6h 10m

Miami

Mon 6/29

6:50 pm-12:25 am

1 stop5h 35m

$415

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/23

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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

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 May 27, 2026.

It’s optimal to fly from Louisville to Key Largo in the evening. By choosing this option you can save up to 61% on the cost of your flight, compared to a flight at noon.

How much does it cost to fly round-trip from Louisville to Key Largo?

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 May 27, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andUnited 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
7.9
Good
4,265 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
7.9
Good
4,265 reviews
Southwest
7.9
Good
4,265 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Delta
7.9
Good
8,423 reviews
Southwest
7.9
Good
4,265 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,749 reviews
Southwest
7.9
Good
4,265 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,639 reviews
Southwest
7.9
Good
4,265 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Spirit Airlines
6.2
Okay
Southwest
7.9
Good
4,265 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 8 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 19 times in the past calendar month.

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

    Airlines like Southwest fly from Louisville to Key Largo in about 5h 10m. The time it takes to get you to your destination can typically vary by up to . Louisville and Key Largo are separated by a distance of 912 mi.

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

    To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $49. Southwest flights start at $89 while deals on American Airlines start at $109 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 (95%), Envoy Air (90%), American Airlines (60%).

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

    While on average a flight from Louisville to Key Largo is generally $477, our data shows the cheapest flight currently is $333. When looking at the most popular route, (Louisville Intl - Miami), you can expect to pay $267 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.

See more FAQs

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Top 8 airlines flying from Louisville to Key Largo

Discover the top 8 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 May 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$70Average$125FlexibilityNo cancel feeOn-time88%
Breeze AirwaysCheapest$76Average$180FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$79Average$176FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$189Average$309FlexibilityNo cancel feeOn-time62%
DeltaCheapest$193Average$398FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$201Average$412FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$207Average$382FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$279Average$353FlexibilityNo cancel feeOn-time69%

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