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Key Largo

$44+ Cheap flights from Philadelphia (PHL) 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 10/23. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — MIA
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to Key Largo are usually found in September or August, booked 79 days in advance, depart on a Friday or Thursday and return on a Friday

Cheap flight deals from Philadelphia to Key Largo

Keep the following information in mind while searching for Philadelphia to Key Largo flight deals. Data was last updated September 16, 2025.

Round-trip from

$85
(Frontier)

One-way from

$44
(Flightnetwork)

Popular in

December

Cheapest in

September

Average price

$153
From Philadelphia to Key Largo
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One-way flight from Philadelphia to Key Largo
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Highest demand for flights based on searches. 7% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 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 Philadelphia to Key Largo

Cheapest flights from Philadelphia to Key Largo
Explore the most affordable flight options available from Philadelphia to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/35:05 pmPHL - MIA
Nonstop3h 01mFrontier
Thu 10/91:00 pmMIA - PHL
Nonstop2h 50mFrontier
Deal found 9/14$85
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/24:03 pmPHL - MIA
Nonstop3h 06mSpirit Airlines
Sun 10/56:00 amMIA - PHL
Nonstop2h 52mSpirit Airlines
Deal found 9/15$86
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/35:05 pmPHL - MIA
Nonstop3h 01mFrontier
Fri 10/109:24 pmMIA - PHL
Nonstop3h 01mFrontier
Deal found 9/15$87
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/275:59 pmPHL - MIA
Nonstop3h 06mSpirit Airlines
Sat 10/41:55 pmMIA - PHL
Nonstop2h 49mSpirit Airlines
Deal found 9/16$88
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/265:10 pmPHL - MIA
Nonstop3h 01mFrontier
Fri 10/39:16 pmMIA - PHL
Nonstop2h 57mFrontier
Deal found 9/14$89
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/49:11 pmPHL - MIA
Nonstop3h 02mMultiple Airlines
Mon 12/89:56 pmMIA - PHL
Nonstop2h 58mMultiple Airlines
Deal found 9/13$90
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/15:59 pmPHL - MIA
Nonstop2h 55mMultiple Airlines
Mon 11/38:25 pmMIA - PHL
Nonstop2h 58mMultiple Airlines
Deal found 9/14$91
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/185:59 pmPHL - MIA
Nonstop2h 55mSpirit Airlines
Mon 10/206:02 pmMIA - PHL
Nonstop2h 55mSpirit Airlines
Deal found 9/14$92
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/225:10 pmPHL - MIA
Nonstop3h 01mFrontier
Fri 9/269:16 pmMIA - PHL
Nonstop2h 57mFrontier
Deal found 9/14$93
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/225:10 pmPHL - MIA
Nonstop3h 01mMultiple Airlines
Thu 9/256:00 amMIA - PHL
Nonstop2h 50mMultiple Airlines
Deal found 9/14$94
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/174:35 pmPHL - MIA
Nonstop2h 54mSpirit Airlines
Sun 10/266:00 amMIA - PHL
Nonstop2h 52mSpirit Airlines
Deal found 9/14$97

Cheapflights Fare Finder

 
Customize your flight search to find flights from Philadelphia 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 Philadelphia to Key Largo that are best for you.

Fly from

Philadelphia

Fly to

Key Largo

Route

Depart

Return

Price

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Mon 10/6

5:25 pm-10:05 pm

1 stop4h 40m

Miami

Wed 10/15

7:35 am-3:20 pm

1 stop7h 45m

$159

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Mon 10/13

5:55 am-12:10 pm

1 stop6h 15m

Miami

Fri 10/17

7:20 am-12:25 pm

1 stop5h 05m

$161

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Thu 11/20

5:15 pm-9:50 pm

1 stop4h 35m

Miami

Sun 11/23

6:20 am-2:40 pm

1 stop8h 20m

$161

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sun 11/23

5:25 pm-10:05 pm

1 stop4h 40m

Miami

Fri 11/28

6:20 am-2:40 pm

1 stop8h 20m

$161

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Wed 11/19

8:05 am-8:25 pm

2 stops12h 20m

Miami

Sun 11/23

6:20 am-2:40 pm

1 stop8h 20m

$164

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Mon 11/24

1:40 pm-11:45 pm

2 stops10h 05m

Miami

Fri 11/28

7:10 am-4:45 pm

1 stop9h 35m

$166

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Mon 11/17

5:15 pm-9:50 pm

1 stop4h 35m

Miami

Fri 11/21

6:55 am-3:55 pm

2 stops9h 00m

$166

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Wed 10/1

6:30 am-4:40 pm

2 stops10h 10m

Miami

Sat 10/18

6:50 am-11:20 am

1 stop4h 30m

$166

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Wed 10/1

10:30 am-9:15 pm

2 stops10h 45m

Miami

Sun 10/12

7:00 am-12:30 pm

1 stop5h 30m

$166

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Tue 12/9

7:15 am-12:05 pm

1 stop4h 50m

Miami

Thu 12/11

9:30 am-4:35 pm

1 stop7h 05m

$167

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 20 results
1
2

Best time to book a flight from Philadelphia to Key Largo

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

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

Use this chart to determine the optimal time to book a round-trip flight from Philadelphia to Key Largo. Price data was last updated on September 12, 2025.

Booking 79 days in advance of your planned departure date is, on average, the best time to get cheap flights from Philadelphia to Key Largo. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Philadelphia to Key Largo?

Currently, September is the cheapest month in which you can book a flight from Philadelphia to Key Largo (average of $232). Flying from Philadelphia 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 PHL to KE9?

Find hourly flight availability from Philadelphia 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 Philadelphia to Key Largo as you normally would.

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

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

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

Weekly flight availability from Philadelphia to Key Largo

Explore weekly flight availability from Philadelphia 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 PHL to KE9 are scheduled on a Thursday (23 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (12 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.
Read through reviews of airlines operating flights from Philadelphia to Key Largo, such as Southwest, Delta, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

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

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

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

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

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

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

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

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

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
Frontier
5.8
Fair
3,174 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

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 Philadelphia 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 Philadelphia to Key Largo?

    If you book a flight to Key Largo from Philadelphia, you will be flying from Philadelphia, which is the city’s only airport. Philadelphia (PHL) is located 7.0 mi from the center of Philadelphia. There are 19 flights from Philadelphia to Key Largo per day from 10 different airlines.

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

    Flights from Philadelphia to Key Largo have been viewed 231 times in the past calendar month.

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

    Departing from Philadelphia to Key Largo will take you 4h 40m. The distance between Philadelphia and Key Largo is about 1015 mi.

  • What are the most reliable airlines from Philadelphia 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 Philadelphia to Key Largo on time: Aer Lingus (87%), Frontier (77%), American Airlines (70%).

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

    Looking for the cheapest flight from Philadelphia to Key Largo? While on average our users pay $505, our data indicates the cheapest price to be $42. The most popular route (Philadelphia - Miami), is priced around $63.

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

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from Philadelphia to Key Largo (average of $232). Flying from Philadelphia 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.

See more FAQs

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Alternative routes for Philadelphia to Key Largo

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Top 10 airlines flying from Philadelphia to Key Largo

Discover the top 10 airlines that operate flights from Philadelphia 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
FrontierCheapest$68Average$177FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$79Average$170FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$98Average$224FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$102Average$255FlexibilityNo cancel feeOn-time88%
SouthwestCheapest$134Average$342FlexibilityNo cancel feeOn-time63%
Avelo AirlinesCheapest$136Average$212FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$179Average$434FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$400FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$243Average$315FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$350Average$468FlexibilityNo cancel feeOn-time69%

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