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Key Largo

$84+ 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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — MIA
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Louisville Intl to Key Largo are usually found in July or January, booked 86 days in advance, depart on a Friday or Tuesday and return on a Tuesday

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 June 12, 2025.

Round-trip from

$209
(Delta)

One-way from

$94
(Southwest)

Popular in

March

Cheapest in

July

Average price

$363
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. 3% potential increase in price ($14 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 June 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 June 12, 2025.

This Delta deal was found by Cheapflights users on 6/11. 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 7/83:21 pmSDF - MIA
1 stop5h 57mDelta
Thu 7/245:30 amMIA - SDF
1 stop4h 24mDelta
Deal found 6/11$209
This Southwest deal was found by Cheapflights users on 6/10. 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.
Sat 8/233:10 pmSDF - MIA
1 stop5h 25mSouthwest
Tue 8/266:55 amMIA - SDF
2 stops8h 20mSouthwest
Deal found 6/10$214
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Mon 8/186:14 amSDF - MIA
Nonstop2h 33mAmerican Airlines
Sat 8/239:52 pmMIA - SDF
Nonstop2h 33mAmerican Airlines
Deal found 6/11$215
This FlightHub deal was found by Cheapflights users on 6/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/812:00 pmSDF - MIA
1 stop4h 25mSpirit Airlines
Sat 9/138:26 pmMIA - SDF
1 stop21h 19mSpirit Airlines
Deal found 6/11$231
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Tue 7/226:00 amSDF - MIA
2 stops10h 41mUnited Airlines
Tue 7/294:16 pmMIA - SDF
1 stop5h 58mUnited Airlines
Deal found 6/10$296
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/2610:54 amSDF - MIA
3 stops29h 02mMultiple Airlines
Sun 8/311:10 amMIA - SDF
3 stops26h 45mMultiple Airlines
Deal found 6/11$368

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 June 12, 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 7/8

3:21 pm-9:18 pm

1 stop5h 57m

Miami

Thu 7/24

5:30 am-9:54 am

1 stop4h 24m

$209

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Sat 8/23

3:10 pm-8:35 pm

1 stop5h 25m

Miami

Tue 8/26

1:00 pm-10:40 pm

2 stops9h 40m

$214

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Mon 8/18

5:57 pm-8:30 pm

Nonstop2h 33m

Miami

Sat 8/23

12:00 pm-2:51 pm

Nonstop2h 51m

$215

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Mon 9/8

12:00 pm-4:25 pm

1 stop4h 25m

Miami

Sat 9/13

8:26 pm-5:45 pm

1 stop21h 19m

$231

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Thu 8/14

6:00 am-11:49 am

1 stop5h 49m

Miami

Tue 8/19

4:16 pm-10:24 pm

1 stop6h 08m

$256

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 7/23

9:46 am-4:53 pm

3 stops31h 07m

Miami

Tue 7/29

11:44 am-3:36 pm

2 stops27h 52m

$335

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 10/8

3:50 pm-9:05 pm

1 stop5h 15m

$84

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Wed 7/9

4:31 pm-5:38 am

2 stops13h 07m

$99

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Sat 7/12

8:33 pm-4:53 pm

2 stops20h 20m

$159

LouisvilleMiami

SDF - MIA

SDFMIA

Louisville Intl

Tue 7/15

6:00 am-6:37 pm

2 stops12h 37m

$218

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/9

Showing 1-10 of 12 results
1
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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 June 9, 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 86 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 $228). 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 June 12, 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.

Rainfall in Key Largo by month

Plan your trip to Key Largo by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Key Largo ranges from 1.6 - 9.9 inches per month. September is typically the wettest month, when rainfall can reach 9.9 in. January is typically the driest time to visit Key Largo when rainfall is around 1.6 in.

Temperature in Key Largo by month

Plan your trip to Key Largo by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Key Largo, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 68.0 F).

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 June 12, 2025.
See what other customers who have flown with Southwest, Delta and United Airlines from Louisville to Key Largo have to say. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,287 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Delta
8.0
Very good
7,950 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
United Airlines
7.4
Good
8,790 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Spirit Airlines
6.3
Okay
8,052 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 1 outbound flight 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.

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

    To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $94. Spirit Airlines flights start at $99 while deals on Delta start at $218 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: Republic Airways (80%), American Airlines (56%), Qatar Airways (55%).

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

    While on average a flight from Louisville to Key Largo is generally $875, our data shows the cheapest flight currently is $185. When looking at the most popular route, (Louisville Intl - Miami), you can expect to pay $167 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 $228). 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$67Average$156FlexibilityNo cancel feeOn-time65%
Allegiant AirCheapest$76Average$133FlexibilityNo cancel feeOn-time88%
DeltaCheapest$199Average$355FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$215Average$388FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$242Average$440FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$258Average$461FlexibilityNo cancel feeOn-time69%

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