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$37+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — PHL
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Key Largo to Philadelphia are usually found in February or January, booked 75 days in advance, depart on a Friday or Thursday and return on a Friday

Cheap 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 December 18, 2025.

This eDestinos deal was found by Cheapflights users on 12/17. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:28 pmMIA - PHL
Nonstop2h 58mFrontier
Sat 1/311:41 amPHL - MIA
Nonstop3h 00mFrontier
Deal found 12/17$81
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/258:40 pmMIA - PHL
Nonstop2h 54mMultiple Airlines
Sat 1/311:41 amPHL - MIA
Nonstop3h 00mMultiple Airlines
Deal found 12/16$84
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/258:40 pmMIA - PHL
Nonstop2h 54mSpirit Airlines
Sun 1/45:17 amPHL - MIA
Nonstop2h 58mSpirit Airlines
Deal found 12/16$85
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/239:28 pmMIA - PHL
Nonstop2h 58mMultiple Airlines
Sat 1/35:17 amPHL - MIA
Nonstop2h 58mMultiple Airlines
Deal found 12/16$86
This CheapOair deal was found by Cheapflights users on 12/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:40 pmMIA - PHL
Nonstop2h 54mSpirit Airlines
Sun 1/45:17 amPHL - MIA
Nonstop2h 58mSpirit Airlines
Deal found 12/16$95
This CheapOair deal was found by Cheapflights users on 12/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:40 pmMIA - PHL
Nonstop2h 54mSpirit Airlines
Fri 1/25:17 amPHL - MIA
Nonstop2h 58mSpirit Airlines
Deal found 12/15$97
This Cheapflightsfares deal was found by Cheapflights users on 12/16. 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.
Thu 12/258:40 pmMIA - PHL
Nonstop2h 54mSpirit Airlines
Fri 1/25:17 amPHL - MIA
Nonstop2h 58mSpirit Airlines
Deal found 12/16$101
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/218:40 pmMIA - PHL
Nonstop2h 54mMultiple Airlines
Tue 1/611:59 amPHL - MIA
Nonstop3h 00mMultiple Airlines
Deal found 12/16$104
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/239:28 pmMIA - PHL
Nonstop2h 58mMultiple Airlines
Fri 1/25:17 amPHL - MIA
Nonstop2h 58mMultiple Airlines
Deal found 12/16$108

Find 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 December 18, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$65
(Priceline)

One-way from

$37
(CheapOair)

Popular in

June

Cheapest in

February

Average price

$167
Provider with most accurate pricing for Miami-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Miami-Philadelphia flights.
Search Deals
From Key Largo to Philadelphia
Search Deals
One-way flight from Key Largo to Philadelphia
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($55 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 18, 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

Wed 1/7

1:41 pm-7:09 pm

1 stop5h 28m

Philadelphia

Sun 1/11

6:06 pm-9:14 pm

Nonstop3h 08m

$77

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Thu 1/22

2:31 pm-5:30 pm

Nonstop2h 59m

Philadelphia

Sat 2/7

1:54 pm-1:08 pm

1 stop23h 14m

$94

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Sun 12/21

10:00 pm-12:50 am

Nonstop2h 50m

Philadelphia

Sat 1/3

5:17 am-8:15 am

Nonstop2h 58m

$110

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Wed 1/7

10:13 am-8:47 am

2 stops22h 34m

Philadelphia

Sun 1/11

9:52 am-12:56 pm

Nonstop3h 04m

$119

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Thu 1/22

9:26 pm-8:47 am

2 stops35h 21m

Philadelphia

Mon 1/26

2:55 pm-5:51 pm

Nonstop2h 56m

$127

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Thu 1/1

8:40 pm-11:34 pm

Nonstop2h 54m

Philadelphia

Mon 1/5

5:17 am-8:15 am

Nonstop2h 58m

$147

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Mon 3/9

5:05 am-10:59 am

1 stop5h 54m

Philadelphia

Thu 3/12

6:26 pm-9:24 pm

Nonstop2h 58m

$149

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Thu 12/25

8:40 pm-11:34 pm

Nonstop2h 54m

Philadelphia

Wed 12/31

5:17 am-8:15 am

Nonstop2h 58m

$182

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Thu 12/25

2:47 pm-11:15 pm

1 stop8h 28m

Philadelphia

Wed 12/31

2:25 pm-12:47 am

1 stop10h 22m

$199

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Wed 1/7

2:35 pm-8:20 pm

1 stop5h 45m

Philadelphia

Sun 1/11

1:15 pm-10:10 pm

1 stop8h 55m

$215

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 21 results
1
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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 December 12, 2025.

The best time to book flights from Key Largo to Philadelphia is 75 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, March is the cheapest month in which you can book a flight from Key Largo to Philadelphia (average of $41). Flying from Key Largo to Philadelphia in August is currently the most expensive (average of $73). 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 December 18, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 51% on flights from Key Largo to Philadelphia by exploring options for tickets in the evening.

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 December 13, 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.

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 December 18, 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
11,054 reviews

Comfort

7.2

Boarding

7.5

Food

6.5

Overall

7.2

Entertainment

6.9

Crew

8.0

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
11,054 reviews
American Airlines
7.2
Good
11,054 reviews

Comfort

7.2

Boarding

7.5

Food

6.5

Overall

7.2

Entertainment

6.9

Crew

8.0

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
8,189 reviews
American Airlines
7.2
Good
11,054 reviews

Comfort

7.2

Boarding

7.5

Food

6.5

Overall

7.2

Entertainment

6.9

Crew

8.0

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
3,081 reviews
American Airlines
7.2
Good
11,054 reviews

Comfort

7.2

Boarding

7.5

Food

6.5

Overall

7.2

Entertainment

6.9

Crew

8.0

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 8 flights from Key Largo to Philadelphia per day from 4 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 59m. Frontier provides one of the quickest options available for as low as $94. The distance from Key Largo to Philadelphia is about 1015 mi. This flight may include one or multiple stops.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $39. However, be on the lookout for offers from Spirit Airlines and JetBlue, as they are both options that can get you from Key Largo to Philadelphia for a low price.

  • 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: Aer Lingus (90%), GOL (84%), Malaysia Airlines( 83%).

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

    The cheapest flight price from Key Largo to Philadelphia is $31. On average you can expect to pay $922. The most popular route, (Miami - Philadelphia), can usually be booked for $57.

  • 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, March is the cheapest month in which you can book a flight from Key Largo to Philadelphia (average of $41). Flying from Key Largo to Philadelphia in August is currently the most expensive (average of $73). 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
Wildwood
Pottstown
King of Prussia
Reading
Ocean City
Cherry Hill
Lewes
Dewey Beach
Ephrata
Camden
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Newark
Millville
Chester

Browse thousands of different options on Cheapflights for your next trip

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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 4 airlines flying from Key Largo to Philadelphia

Discover the top 4 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$133FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$69Average$138FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$71Average$183FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$141Average$379FlexibilityNo cancel feeOn-time71%

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