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Key Largo

$40+ 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 5/25. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — MIA
Jun 13 — Jun 201
Sat 6/13
Sat 6/20
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 84 days in advance, depart on a Monday or Friday 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 May 14, 2026.

This Super.com deal was found by Cheapflights users on 5/10. 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.
Sun 6/75:32 pm
PHL
-
MIA
Nonstop2h 56m
Frontier
Thu 6/119:38 pm
MIA
-
PHL
Nonstop2h 53m
Frontier
Deal found 5/10$75
This deal was found by Cheapflights users on 5/9. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/89:34 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Mon 10/125:39 pm
MIA
-
PHL
Nonstop3h 00m
Frontier
Deal found 5/9$87
This Cheapflightsfares deal was found by Cheapflights users on 5/12. 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 6/75:32 pm
PHL
-
MIA
Nonstop2h 56m
Frontier
Sun 6/149:28 pm
MIA
-
PHL
Nonstop2h 53m
Frontier
Deal found 5/12$88
This Kiwi.com deal was found by Cheapflights users on 5/12. 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 9/65:32 pm
PHL
-
MIA
Nonstop3h 01m
Frontier
Sun 9/138:50 pm
MIA
-
PHL
Nonstop2h 57m
Frontier
Deal found 5/12$95
This Super.com deal was found by Cheapflights users on 5/9. 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 6/97:05 pm
PHL
-
MIA
Nonstop3h 32m
Frontier
Thu 6/119:38 pm
MIA
-
PHL
Nonstop2h 53m
Frontier
Deal found 5/9$96
This Super.com deal was found by Cheapflights users on 5/13. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/65:32 pm
PHL
-
MIA
Nonstop2h 56m
Frontier
Thu 6/119:38 pm
MIA
-
PHL
Nonstop2h 53m
Frontier
Deal found 5/13$97
This Kiwi.com deal was found by Cheapflights users on 5/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:34 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Sun 10/185:39 pm
MIA
-
PHL
Nonstop3h 00m
Frontier
Deal found 5/13$103
This Super.com deal was found by Cheapflights users on 5/12. 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.
Sun 6/75:32 pm
PHL
-
MIA
Nonstop2h 56m
Frontier
Wed 6/103:09 pm
MIA
-
PHL
Nonstop3h 01m
Frontier
Deal found 5/12$104
This Super.com deal was found by Cheapflights users on 5/10. 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.
Sun 6/75:32 pm
PHL
-
MIA
Nonstop2h 56m
Frontier
Sat 6/209:28 pm
MIA
-
PHL
Nonstop2h 53m
Frontier
Deal found 5/10$106

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 May 14, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$75
(Super.com)

One-way from

$40
(Super.com)

Popular in

June

Cheapest in

September

Average price

$221
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. 11% potential increase in price ($27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 14, 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

12:55 pm-10:10 pm

2 stops9h 15m

Miami

Sun 8/2

5:35 am-1:30 pm

1 stop7h 55m

$368

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Wed 8/19

10:45 am-8:10 pm

2 stops9h 25m

Miami

Mon 8/24

7:00 am-5:25 pm

2 stops10h 25m

$407

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Tue 7/7

12:55 pm-10:10 pm

2 stops9h 15m

Miami

Sat 7/11

7:15 am-8:55 pm

2 stops13h 40m

$437

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Thu 10/1

6:15 am-3:30 pm

2 stops9h 15m

Miami

Mon 10/5

7:00 am-3:50 pm

2 stops8h 50m

$447

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Mon 8/3

2:00 pm-10:05 pm

2 stops8h 05m

Miami

Wed 8/5

12:50 pm-8:55 pm

2 stops8h 05m

$456

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sun 7/26

7:55 am-4:45 pm

2 stops8h 50m

Miami

Wed 7/29

7:40 am-5:00 pm

2 stops9h 20m

$456

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Thu 7/16

2:00 pm-10:05 pm

2 stops8h 05m

Miami

Tue 7/21

11:45 am-9:20 pm

2 stops9h 35m

$456

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Fri 6/26

11:20 am-10:05 pm

2 stops10h 45m

Miami

Tue 6/30

11:25 am-9:20 pm

2 stops9h 55m

$468

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Wed 7/22

1:50 pm-9:50 pm

1 stop8h 00m

Miami

Mon 7/27

7:15 am-5:50 pm

2 stops10h 35m

$481
Quickest round-trip

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Tue 6/16

9:35 am-3:50 pm

1 stop6h 15m

Miami

Fri 6/19

5:25 am-1:20 pm

2 stops7h 55m

$481

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/13

Showing 1-10 of 24 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 May 14, 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 48% 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 May 9, 2026.

Travelers seeking maximum savings on their Philadelphia to Key Largo flight should consider departing on Sunday at noon when fares are most often at their lowest. Saturday mornings 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 May 14, 2026.

The most flights from PHL to KE9 are scheduled on a Wednesday (27 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (23 on average).

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

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 May 14, 2026.
Read through reviews of airlines operating flights from Philadelphia to Key Largo, such as Allegiant Air,JetBlue, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Allegiant Air
7.3
Good
708 reviews

Crew

8.1

Overall

7.3

Comfort

6.9

Entertainment

5.5

Boarding

7.6

Food

5.8

Reviews

1 / 20
2.0
Mediocre

larry,Apr 2026

PSC - SNA

After waiting more than 6 hours our flight was delayed until the next day. The flight was extremely uncomfortable. Like riding on hard plastic lawn chairs in the sky.
Allegiant Air
7.3
Good
708 reviews
Allegiant Air
7.3
Good
708 reviews

Crew

8.1

Overall

7.3

Comfort

6.9

Entertainment

5.5

Boarding

7.6

Food

5.8

Reviews

1 / 20
2.0
Mediocre

larry,Apr 2026

PSC - SNA

After waiting more than 6 hours our flight was delayed until the next day. The flight was extremely uncomfortable. Like riding on hard plastic lawn chairs in the sky.
JetBlue
7.2
Good
2,975 reviews
Allegiant Air
7.3
Good
708 reviews

Crew

8.1

Overall

7.3

Comfort

6.9

Entertainment

5.5

Boarding

7.6

Food

5.8

Reviews

1 / 20
2.0
Mediocre

larry,Apr 2026

PSC - SNA

After waiting more than 6 hours our flight was delayed until the next day. The flight was extremely uncomfortable. Like riding on hard plastic lawn chairs in the sky.
American Airlines
7.1
Good
11,667 reviews
Allegiant Air
7.3
Good
708 reviews

Crew

8.1

Overall

7.3

Comfort

6.9

Entertainment

5.5

Boarding

7.6

Food

5.8

Reviews

1 / 20
2.0
Mediocre

larry,Apr 2026

PSC - SNA

After waiting more than 6 hours our flight was delayed until the next day. The flight was extremely uncomfortable. Like riding on hard plastic lawn chairs in the sky.
Spirit Airlines
6.3
Okay
8,626 reviews
Allegiant Air
7.3
Good
708 reviews

Crew

8.1

Overall

7.3

Comfort

6.9

Entertainment

5.5

Boarding

7.6

Food

5.8

Reviews

1 / 20
2.0
Mediocre

larry,Apr 2026

PSC - SNA

After waiting more than 6 hours our flight was delayed until the next day. The flight was extremely uncomfortable. Like riding on hard plastic lawn chairs in the sky.
Frontier
5.7
Fair
2,953 reviews
Allegiant Air
7.3
Good
708 reviews

Crew

8.1

Overall

7.3

Comfort

6.9

Entertainment

5.5

Boarding

7.6

Food

5.8

Reviews

1 / 20
2.0
Mediocre

larry,Apr 2026

PSC - SNA

After waiting more than 6 hours our flight was delayed until the next day. The flight was extremely uncomfortable. Like riding on hard plastic lawn chairs in the sky.

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 8 different airlines.

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

    Flights from Philadelphia to Key Largo have been viewed 411 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 9h 15m. 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 $39 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: Aer Lingus (91%), Alaska Airlines (85%), American Airlines (84%).

  • 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 $659, our data indicates the cheapest price to be $38. The most popular route (Philadelphia - Miami), is priced around $132.

  • 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.
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Top 8 airlines flying from Philadelphia to Key Largo

Discover the top 8 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 May 14, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$40Average$143FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$55Average$248FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$64Average$188FlexibilityNo cancel feeOn-time65%
Allegiant AirCheapest$82Average$135FlexibilityNo cancel feeOn-time88%
DeltaCheapest$115Average$384FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$134Average$268FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$141Average$431FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$236Average$350FlexibilityNo cancel feeOn-time69%

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