Key Largo

$62+ 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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — MIA
Jul 29 — Aug 51
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Find cheap flights from Philadelphia to Key Largo with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Philadelphia to Key Largo are usually found in September or January, booked 29 days in advance, depart on a Monday or Sunday 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 June 29, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 6/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/244:47 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Sun 9/278:50 pm
MIA
-
PHL
Nonstop2h 57m
Frontier
Deal found 6/24$119
This Super.com deal was found by Cheapflights users on 6/24. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/264:35 pm
PHL
-
MIA
Nonstop3h 10m
Frontier
Thu 9/38:50 pm
MIA
-
PHL
Nonstop3h 05m
Frontier
Deal found 6/24$120
This Frontier deal was found by Cheapflights users on 6/26. 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.
Thu 10/14:47 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Thu 10/298:50 pm
MIA
-
PHL
Nonstop2h 57m
Frontier
Deal found 6/26$121
This Frontier deal was found by Cheapflights users on 6/25. 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.
Wed 8/194:35 pm
PHL
-
MIA
Nonstop3h 10m
Frontier
Thu 8/279:35 am
MIA
-
PHL
Nonstop2h 54m
Frontier
Deal found 6/25$122
This Frontier deal was found by Cheapflights users on 6/25. 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.
Mon 8/105:25 pm
PHL
-
MIA
Nonstop3h 01m
Frontier
Thu 8/209:35 am
MIA
-
PHL
Nonstop2h 54m
Frontier
Deal found 6/25$123
This Cheapflightsfares deal was found by Cheapflights users on 6/28. 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 8/65:25 pm
PHL
-
MIA
Nonstop3h 01m
Frontier
Thu 8/139:21 pm
MIA
-
PHL
Nonstop3h 06m
Frontier
Deal found 6/28$125
This Orbitz deal was found by Cheapflights users on 6/25. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/225:25 pm
PHL
-
MIA
Nonstop3h 01m
Frontier
Thu 7/239:21 pm
MIA
-
PHL
Nonstop3h 06m
Frontier
Deal found 6/25$127
This Frontier deal was found by Cheapflights users on 6/28. 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 8/175:25 pm
PHL
-
MIA
Nonstop3h 01m
Frontier
Thu 9/39:35 am
MIA
-
PHL
Nonstop2h 54m
Frontier
Deal found 6/28$128
This Super.com deal was found by Cheapflights users on 6/27. 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 7/205:25 pm
PHL
-
MIA
Nonstop3h 01m
Frontier
Thu 7/239:21 pm
MIA
-
PHL
Nonstop3h 06m
Frontier
Deal found 6/27$130
This Frontier deal was found by Cheapflights users on 6/26. 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.
Mon 7/135:25 pm
PHL
-
MIA
Nonstop3h 01m
Frontier
Thu 7/169:21 pm
MIA
-
PHL
Nonstop3h 06m
Frontier
Deal found 6/26$132

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 June 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$119
(Cheapflightsfares)

One-way from

$62
(Cheapflightsfares)

Popular in

June

Cheapest in

September

Average price

$281
Provider with most accurate pricing for Philadelphia-Miami flight deals.
Provider most trusted by Cheapflights users for Philadelphia-Miami flights.
From Philadelphia to Key Largo
One-way flight from Philadelphia to Key Largo
Highest demand for flights based on searches. 12% potential increase in price ($31 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Average for round-trip flights in June 2026

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 June 29, 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

Cheapest round-trip

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Tue 7/28

7:25 am-4:25 pm

2 stops9h 00m

Miami

Tue 8/4

9:15 am-6:00 pm

2 stops8h 45m

$379

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Tue 11/17

11:45 am-9:50 pm

2 stops10h 05m

Miami

Fri 11/20

4:15 pm-11:15 pm

1 stop7h 00m

$469

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Wed 8/12

10:45 am-8:10 pm

2 stops9h 25m

Miami

Sun 8/16

6:45 am-3:55 pm

2 stops9h 10m

$474

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Wed 8/5

10:45 am-8:10 pm

2 stops9h 25m

Miami

Sun 8/9

6:45 am-3:55 pm

2 stops9h 10m

$474

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sat 8/22

8:55 am-7:15 pm

2 stops10h 20m

Miami

Sun 8/30

6:45 am-3:30 pm

2 stops8h 45m

$474

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sun 10/11

2:40 pm-11:10 pm

2 stops8h 30m

Miami

Thu 10/15

7:00 am-5:35 pm

2 stops10h 35m

$478

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Wed 7/15

1:50 pm-10:15 pm

2 stops8h 25m

Miami

Sat 7/18

6:10 am-10:50 am

1 stop4h 40m

$480

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sun 7/19

5:30 pm-10:15 pm

1 stop4h 45m

Miami

Wed 7/22

6:00 am-1:10 pm

2 stops7h 10m

$481

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sat 7/11

11:25 am-10:30 pm

2 stops11h 05m

Miami

Tue 7/14

7:40 am-5:00 pm

2 stops9h 20m

$485
Quickest round-trip

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Thu 12/24

6:35 am-11:37 am

1 stop5h 02m

Miami

Tue 12/29

12:45 pm-6:19 pm

1 stop5h 34m

$502

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/26

Showing 1-10 of 22 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

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 June 29, 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 afternoon, which can drop the price by up to 50% versus a flight in the morning.

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

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 June 27, 2026.

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

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 29, 2026.
Read through reviews of airlines operating flights from Philadelphia to Key Largo, such as Southwest,Allegiant Air, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Boarding

8.1

Crew

8.6

Overall

7.9

Food

7.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
6.0
Good

Scott,Feb 2026

HOU - FLL

Delayed by 45 minutes leaving Houston, making a 3.5 hour layover that much longer.

Boarding

8.1

Crew

8.6

Overall

7.9

Food

7.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
6.0
Good

Scott,Feb 2026

HOU - FLL

Delayed by 45 minutes leaving Houston, making a 3.5 hour layover that much longer.

Boarding

8.1

Crew

8.6

Overall

7.9

Food

7.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
6.0
Good

Scott,Feb 2026

HOU - FLL

Delayed by 45 minutes leaving Houston, making a 3.5 hour layover that much longer.

Boarding

8.1

Crew

8.6

Overall

7.9

Food

7.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
6.0
Good

Scott,Feb 2026

HOU - FLL

Delayed by 45 minutes leaving Houston, making a 3.5 hour layover that much longer.

Boarding

8.1

Crew

8.6

Overall

7.9

Food

7.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
6.0
Good

Scott,Feb 2026

HOU - FLL

Delayed by 45 minutes leaving Houston, making a 3.5 hour layover that much longer.

Boarding

8.1

Crew

8.6

Overall

7.9

Food

7.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
6.0
Good

Scott,Feb 2026

HOU - FLL

Delayed by 45 minutes leaving Houston, making a 3.5 hour layover that much longer.

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 26 flights from Philadelphia to Key Largo per day from 7 different airlines.

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

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

    Departing from Philadelphia to Key Largo will take you 9h. The distance between Philadelphia and Key Largo is about 1015 mi.

  • 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 $33. Users have also found prices from $39 and $64 on Allegiant Air and JetBlue, 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: Sun Country Air (100%), Alaska Airlines (93%), Qatar Airways (90%).

  • 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 $1,027, our data indicates the cheapest price to be $74. The most popular route (Philadelphia - Miami), is priced around $121.

  • 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.

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.

Top 7 airlines flying from Philadelphia to Key Largo

Discover the top 7 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 June 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$40Average$150FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$55Average$275FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$78Average$136FlexibilityNo cancel feeOn-time88%
DeltaCheapest$115Average$414FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$143Average$444FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$145Average$281FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$236Average$350FlexibilityNo cancel feeOn-time69%

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