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$51+ 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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — PHL
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
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 July 31, 2025.

Round-trip from

$99
(CheapOair)

One-way from

$51
(Expedia)

Popular in

June

Cheapest in

February

Average price

$198
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. 17% potential increase in price ($39 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 31, 2025.

This Mytrip deal was found by Cheapflights users on 7/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/296:50 amMIA - PHL
Nonstop2h 56mSpirit Airlines
Mon 9/13:51 pmPHL - MIA
Nonstop3h 01mSpirit Airlines
Deal found 7/30$99
This Frontier deal was found by Cheapflights users on 7/31. 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 10/99:42 pmMIA - PHL
Nonstop3h 01mFrontier
Sun 10/265:43 pmPHL - MIA
Nonstop2h 54mFrontier
Deal found 7/31$101
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 9/159:16 pmMIA - PHL
Nonstop2h 57mMultiple Airlines
Thu 9/254:03 pmPHL - MIA
Nonstop3h 06mMultiple Airlines
Deal found 7/30$111

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 July 31, 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 8/29

6:50 am-9:46 am

Nonstop2h 56m

Philadelphia

Mon 9/1

3:51 pm-6:52 pm

Nonstop3h 01m

$99

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Thu 10/9

9:42 pm-12:43 am

Nonstop3h 01m

Philadelphia

Sun 10/26

5:43 pm-8:37 pm

Nonstop2h 54m

$101

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Mon 9/15

9:16 pm-12:13 am

Nonstop2h 57m

Philadelphia

Thu 9/25

4:03 pm-7:09 pm

Nonstop3h 06m

$111

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Sat 8/9

11:03 am-1:59 pm

Nonstop2h 56m

$51

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Fri 8/29

9:45 pm-12:49 am

Nonstop3h 04m

$52

MiamiPhiladelphia

MIA - PHL

MIAPHL

Miami

Tue 9/2

6:55 am-2:30 pm

1 stop7h 35m

$109

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

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 July 25, 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 July 31, 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 July 27, 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 July 31, 2025.

The most flights from KE9 to PHL are scheduled on a Thursday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (18 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 July 31, 2025.
See what other customers who have flown with Southwest, 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.
Southwest
8.0
Very good
4,244 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Spirit Airlines
6.3
Okay
8,047 reviews
Southwest
8.0
Very good
4,244 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Frontier
5.9
Fair
3,238 reviews
Southwest
8.0
Very good
4,244 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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 23 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 65 times in the past calendar month.

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

    The cheapest airline one-way is Spirit Airlines, with whom users have recently found tickets for as low as $51. However, be on the lookout for offers from Frontier and Southwest, 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: Royal Air Maroc (93%), Aer Lingus (81%), GOL( 76%).

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

    The cheapest flight price from Key Largo to Philadelphia is $57. On average you can expect to pay $1,447. The most popular route, (Miami - Philadelphia), can usually be booked for $69.

  • 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
Cherry Hill
Ocean City
Chester
Millville
Reading
Ephrata
Camden
Dewey Beach
Dover
Elkton
Essington
Willow Grove
Newark
Exton
Glen Mills
Springfield

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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 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$61Average$133FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$76Average$148FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$83Average$150FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$141Average$384FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$150Average$376FlexibilityNo cancel feeOn-time63%
DeltaCheapest$196Average$336FlexibilityNo cancel feeOn-timeN/A

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