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$46+ Cheap flights from Key Largo, FL to Philadelphia (PHL)

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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — PHL
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Philadelphia are usually found in February or January, booked 89 days in advance, depart on a Friday or Thursday and return on a Friday

Cheap flight deals from Key Largo to Philadelphia

Keep the following information in mind while searching for Key Largo to Philadelphia flight deals. Data was last updated September 15, 2025.

Round-trip from

$85
(Cheapflightsfares)

One-way from

$46
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$143
From Key Largo to Philadelphia
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One-way flight from Key Largo to Philadelphia
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Highest demand for flights based on searches. 20% potential increase in price ($48 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($8 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 Key Largo to Philadelphia

Cheapest flights from Key Largo to Philadelphia
Explore the most affordable flight options available from Key Largo to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 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 10/39:16 pmMIA - PHL
Nonstop2h 57mFrontier
Mon 10/65:05 pmPHL - MIA
Nonstop3h 01mFrontier
Deal found 9/14$85
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.
Thu 10/26:00 amMIA - PHL
Nonstop2h 50mMultiple Airlines
Sun 10/55:05 pmPHL - MIA
Nonstop3h 01mMultiple Airlines
Deal found 9/14$87
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 9/269:16 pmMIA - PHL
Nonstop2h 57mFrontier
Sun 10/55:05 pmPHL - MIA
Nonstop3h 01mFrontier
Deal found 9/15$89
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/69:56 pmMIA - PHL
Nonstop2h 58mMultiple Airlines
Tue 12/99:11 pmPHL - MIA
Nonstop3h 02mMultiple Airlines
Deal found 9/15$90
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 9/269:16 pmMIA - PHL
Nonstop2h 57mFrontier
Mon 9/295:10 pmPHL - MIA
Nonstop3h 01mFrontier
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.
Fri 9/269:16 pmMIA - PHL
Nonstop2h 57mFrontier
Sun 9/285:20 pmPHL - MIA
Nonstop3h 01mFrontier
Deal found 9/14$93
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/269:16 pmMIA - PHL
Nonstop2h 57mFrontier
Fri 10/35:05 pmPHL - MIA
Nonstop3h 01mFrontier
Deal found 9/15$95
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/266:00 amMIA - PHL
Nonstop2h 52mSpirit Airlines
Mon 10/274:35 pmPHL - MIA
Nonstop2h 54mSpirit Airlines
Deal found 9/13$97
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.
Mon 9/295:57 pmMIA - PHL
Nonstop2h 58mSpirit Airlines
Thu 10/24:03 pmPHL - MIA
Nonstop3h 06mSpirit Airlines
Deal found 9/14$102

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to Philadelphia 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 15, 2025.
Use the filters below to find and compare flights from Key Largo to Philadelphia that are best for you.

Fly from

Key Largo

Fly to

Philadelphia

Route

Depart

Return

Price

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Fri 11/14

7:38 pm-12:39 am

1 stop5h 01m

Philadelphia

Sun 11/16

6:24 pm-9:22 pm

Nonstop2h 58m

$110

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Fri 11/7

7:38 pm-12:39 am

1 stop5h 01m

Philadelphia

Mon 11/10

7:25 am-10:17 am

Nonstop2h 52m

$110

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Sat 1/10

10:00 pm-12:50 am

Nonstop2h 50m

Philadelphia

Sun 1/11

5:57 pm-8:55 pm

Nonstop2h 58m

$124

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Sun 10/12

6:00 am-8:52 am

Nonstop2h 52m

Philadelphia

Fri 10/17

4:35 pm-7:29 pm

Nonstop2h 54m

$128

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Fri 9/26

5:57 pm-8:55 pm

Nonstop2h 58m

Philadelphia

Sat 9/27

5:59 pm-9:05 pm

Nonstop3h 06m

$130

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Fri 9/26

3:55 pm-4:27 am

1 stop12h 32m

Philadelphia

Mon 9/29

12:01 pm-9:38 pm

1 stop9h 37m

$143

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Thu 10/16

10:42 am-9:30 pm

1 stop10h 48m

Philadelphia

Mon 10/20

6:37 pm-12:34 am

1 stop5h 57m

$143

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Tue 10/14

7:35 am-12:50 pm

1 stop5h 15m

Philadelphia

Tue 10/21

12:55 pm-9:55 pm

1 stop9h 00m

$162

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Sun 10/12

6:00 am-8:52 am

Nonstop2h 52m

$49

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Sun 9/21

6:00 am-8:50 am

Nonstop2h 50m

$69

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 19 results
1
2

Best time to book a flight from Key Largo to Philadelphia

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

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

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

The best time to book flights from Key Largo to Philadelphia is 89 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, August is the cheapest month in which you can book a flight from Key Largo to Philadelphia (average of $236). Flying from Key Largo to Philadelphia in March is currently the most expensive (average of $295). 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 KE9 to PHL?

Find hourly flight availability from Key Largo to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

When flying from Key Largo to Philadelphia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Use this chart to determine the cheapest time to fly round-trip from Key Largo to Philadelphia. Price data was last updated on September 14, 2025.

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

Weekly flight availability from Key Largo to Philadelphia

Explore weekly flight availability from Key Largo to Philadelphia. 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 15, 2025.

The most flights from KE9 to PHL are scheduled on a Monday (29 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (25 on average).

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. 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 Philadelphia. Reviews last updated September 15, 2025.
See what other customers who have flown with American Airlines, Spirit Airlines, and Frontier from Key Largo to Philadelphia have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
10,000 reviews

Boarding

7.5

Crew

8.0

Comfort

7.2

Entertainment

6.9

Food

6.4

Overall

7.2

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac
American Airlines
7.2
Good
10,000 reviews
American Airlines
7.2
Good
10,000 reviews

Boarding

7.5

Crew

8.0

Comfort

7.2

Entertainment

6.9

Food

6.4

Overall

7.2

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac
Spirit Airlines
6.3
Okay
8,015 reviews
American Airlines
7.2
Good
10,000 reviews

Boarding

7.5

Crew

8.0

Comfort

7.2

Entertainment

6.9

Food

6.4

Overall

7.2

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac
Frontier
5.8
Fair
3,172 reviews
American Airlines
7.2
Good
10,000 reviews

Boarding

7.5

Crew

8.0

Comfort

7.2

Entertainment

6.9

Food

6.4

Overall

7.2

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac

Related info for your journey

Find useful and relevant information for your journey from Key Largo to Philadelphia. 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 into for flights to Philadelphia from Key Largo?

    If you book a flight to Philadelphia from Key Largo, you will be flying to 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 Key Largo to Philadelphia per day from 6 different airlines.

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

    Flights from Key Largo to Philadelphia have been viewed 60 times in the past calendar month.

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

    A quick flight from Key Largo to Philadelphia can take about 2h 52m. Frontier provides one of the quickest options available for as low as $128. The distance from Key Largo to Philadelphia is about 1015 mi. This flight may include one or multiple stops.

  • What are the most reliable airlines from Key Largo to Philadelphia?

    Before booking your flight to Philadelphia from Key Largo, check out the most reliable airlines to get you to your destination on time: Royal Air Maroc (96%), Frontier (77%), GOL( 76%).

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

    The cheapest flight price from Key Largo to Philadelphia is $46. On average you can expect to pay $877. The most popular route, (Miami - Philadelphia), can usually be booked for $77.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Key Largo to Philadelphia (average of $236). Flying from Key Largo to Philadelphia in March is currently the most expensive (average of $295). 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

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Vineland
Wildwood
King of Prussia
Pottstown
Reading
Dewey Beach
Ephrata
Camden
Ocean City
Cherry Hill
Dover
Elkton
Essington
Willow Grove
Newark
Millville
Chester
Exton
Havre de Grace
Plymouth Meeting

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Key Largo to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Key Largo to Philadelphia

Discover the top 6 airlines that operate flights from Key Largo to Philadelphia. 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 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$61Average$134FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$75Average$148FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$97Average$175FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$141Average$393FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$150Average$376FlexibilityNo cancel feeOn-time63%
DeltaCheapest$210Average$310FlexibilityNo cancel feeOn-timeN/A

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