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Key Largo

$37+ 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 3/22. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — MIA
Mar 31 — Apr 71
Tue 3/31
Tue 4/7
1 adult, Economy
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Find cheap flights from Philadelphia to Key Largo with Cheapflights

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Cheapflights Tip: The best prices from Philadelphia to Key Largo are usually found in September or January, booked 21 days in advance, depart on a Friday or Thursday and return on a Friday

Cheap 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 March 1, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/24. 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.
Mon 5/116:10 pm
PHL
-
MIA
Nonstop3h 07m
Frontier
Fri 5/1510:27 pm
MIA
-
PHL
Nonstop3h 02m
Frontier
Deal found 2/24$75
This CheapOair deal was found by Cheapflights users on 2/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/128:16 pm
PHL
-
MIA
Nonstop2h 55m
Frontier
Thu 4/169:58 am
MIA
-
PHL
Nonstop2h 56m
Frontier
Deal found 2/25$76
This Kiwi.com deal was found by Cheapflights users on 2/26. 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.
Tue 3/176:12 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Thu 3/1910:20 pm
MIA
-
PHL
Nonstop2h 55m
Frontier
Deal found 2/26$77
This Frontier deal was found by Cheapflights users on 2/25. 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.
Tue 3/246:12 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Thu 4/23:39 pm
MIA
-
PHL
Nonstop2h 57m
Frontier
Deal found 2/25$78
This Frontier deal was found by Cheapflights users on 2/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/118:11 pm
PHL
-
MIA
Nonstop2h 55m
Frontier
Wed 4/1510:08 am
MIA
-
PHL
Nonstop3h 04m
Frontier
Deal found 2/26$79
This Super.com deal was found by Cheapflights users on 2/25. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/176:12 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Wed 3/1810:20 pm
MIA
-
PHL
Nonstop2h 55m
Frontier
Deal found 2/25$81
This CheapOair deal was found by Cheapflights users on 2/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/186:12 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Tue 3/2410:20 pm
MIA
-
PHL
Nonstop2h 55m
Frontier
Deal found 2/26$82
This Frontier deal was found by Cheapflights users on 2/25. 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.
Sun 3/226:10 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Wed 4/12:40 pm
MIA
-
PHL
Nonstop2h 58m
Frontier
Deal found 2/25$83
This Super.com deal was found by Cheapflights users on 2/25. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/166:43 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Tue 3/1710:20 pm
MIA
-
PHL
Nonstop2h 55m
Frontier
Deal found 2/25$84
This CheapOair deal was found by Cheapflights users on 2/24. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/146:27 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Wed 3/1810:20 pm
MIA
-
PHL
Nonstop2h 55m
Frontier
Deal found 2/24$85
This CheapOair deal was found by Cheapflights users on 2/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/236:12 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Wed 3/2510:20 pm
MIA
-
PHL
Nonstop2h 55m
Frontier
Deal found 2/25$86
This Travelocity deal was found by Cheapflights users on 2/25. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/74:13 pm
PHL
-
MIA
Nonstop2h 56m
Frontier
Thu 6/118:09 pm
MIA
-
PHL
Nonstop3h 03m
Frontier
Deal found 2/25$87

Find 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 March 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$75
(Kiwi.com)

One-way from

$37
(Super.com)

Popular in

June

Cheapest in

September

Average price

$216
Provider with most accurate pricing for Philadelphia-Miami flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Miami flights.
Search Deals
From Philadelphia to Key Largo
Search Deals
One-way flight from Philadelphia to Key Largo
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 1, 2026.
Use the filters below to find and compare flights from Philadelphia to Key Largo that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sun 3/22

5:40 am-10:36 am

1 stop4h 56m

Miami

Tue 3/31

6:00 am-11:42 am

1 stop5h 42m

$329

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Tue 5/12

11:35 am-9:55 pm

2 stops10h 20m

Miami

Fri 5/15

5:45 pm-11:45 pm

1 stop6h 00m

$397

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Mon 3/30

6:25 pm-12:52 am

1 stop6h 27m

Miami

Sat 4/11

6:00 am-10:55 am

1 stop4h 55m

$429

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Fri 3/13

11:40 am-10:05 pm

2 stops10h 25m

Miami

Tue 3/17

1:15 pm-9:55 pm

1 stop8h 40m

$438

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sat 5/16

5:30 pm-10:05 pm

1 stop4h 35m

Miami

Fri 6/19

5:55 am-4:45 pm

2 stops10h 50m

$451

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Mon 4/27

12:45 pm-10:00 pm

2 stops9h 15m

Miami

Sat 5/2

6:15 am-3:05 pm

2 stops8h 50m

$452

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sat 3/7

5:59 pm-12:53 am

1 stop6h 54m

Miami

Thu 3/12

6:00 am-11:42 am

1 stop5h 42m

$478

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Wed 5/20

9:10 am-9:55 pm

2 stops12h 45m

Miami

Mon 5/25

6:05 am-6:25 pm

1 stop12h 20m

$494

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Mon 4/6

11:40 am-10:05 pm

2 stops10h 25m

Miami

Fri 4/10

6:20 am-4:45 pm

2 stops10h 25m

$530

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Wed 3/25

10:35 am-4:11 pm

1 stop5h 36m

Miami

Tue 3/31

9:00 am-2:16 pm

2 stops29h 16m

$540

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/28

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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 February 20, 2026.

Booking 21 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, March is the cheapest month in which you can book a flight from Philadelphia to Key Largo (average of $36). Flying from Philadelphia to Key Largo in June is currently the most expensive (average of $77). 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 March 1, 2026.

When flying from Philadelphia to Key Largo, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 50% versus a flight in the morning.

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 February 21, 2026.

Travelers seeking maximum savings on their Philadelphia to Key Largo flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Saturday at noon 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 March 1, 2026.

The most flights from PHL to KE9 are scheduled on a Friday (30 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (23 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 March 1, 2026.
Read through reviews of airlines operating flights from Philadelphia to Key Largo, such as Delta, American Airlines, and JetBlue. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,244 reviews

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.5

Food

7.2

Entertainment

7.8

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Delta
7.9
Good
8,244 reviews
Delta
7.9
Good
8,244 reviews

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.5

Food

7.2

Entertainment

7.8

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
American Airlines
7.2
Good
11,370 reviews
Delta
7.9
Good
8,244 reviews

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.5

Food

7.2

Entertainment

7.8

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
JetBlue
7.2
Good
2,895 reviews
Delta
7.9
Good
8,244 reviews

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.5

Food

7.2

Entertainment

7.8

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Spirit Airlines
6.3
Okay
8,490 reviews
Delta
7.9
Good
8,244 reviews

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.5

Food

7.2

Entertainment

7.8

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Frontier
5.7
Fair
3,040 reviews
Delta
7.9
Good
8,244 reviews

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.5

Food

7.2

Entertainment

7.8

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.

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 25 flights from Philadelphia to Key Largo per day from 9 different airlines.

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

    Flights from Philadelphia to Key Largo have been viewed 344 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 56m. The distance between Philadelphia and Key Largo is about 1015 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $32. Users have also found prices from $37 and $52 on Spirit Airlines and Allegiant Air, respectively.

  • 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: Volaris (100%), Spirit Airlines (88%), Malaysia Airlines (87%).

  • 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 $702, our data indicates the cheapest price to be $36. The most popular route (Philadelphia - Miami), is priced around $69.

  • 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, March is the cheapest month in which you can book a flight from Philadelphia to Key Largo (average of $36). Flying from Philadelphia to Key Largo in June is currently the most expensive (average of $77). 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

See prices for flight routes from nearby airports that may be better suited for you.
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Reagan-National to Sarasota flights
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Top 9 airlines flying from Philadelphia to Key Largo

Discover the top 9 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 March 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$40Average$140FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$55Average$231FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$64Average$184FlexibilityNo cancel feeOn-time65%
Allegiant AirCheapest$86Average$154FlexibilityNo cancel feeOn-time88%
DeltaCheapest$115Average$373FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$134Average$286FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$142Average$423FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$236Average$350FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$243Average$315FlexibilityNo cancel feeOn-time75%

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