HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Key Largo

$35+ 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 2/8. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — MIA
Feb 14 — Feb 211
Sat 2/14
Sat 2/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Philadelphia to Key Largo with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Philadelphia to Key Largo are usually found in September or October, booked 46 days in advance, depart on a Friday or Thursday and return on a Friday

Cheap 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 January 15, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$65
(Kiwi.com)

One-way from

$35
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$199
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. 12% potential increase in price ($33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Find 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 January 15, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/88:00 am
PHL
-
MIA
Nonstop3h 05m
Frontier
Wed 2/112:16 pm
MIA
-
PHL
Nonstop2h 59m
Frontier
Deal found 1/14$65
This Cheapflightsfares deal was found by Cheapflights users on 1/14. 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.
Tue 2/106:10 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Fri 2/2011:38 am
MIA
-
PHL
Nonstop3h 00m
Frontier
Deal found 1/14$66
This Priceline deal was found by Cheapflights users on 1/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/79:52 am
PHL
-
MIA
Nonstop3h 04m
Multiple Airlines
Tue 2/102:16 pm
MIA
-
PHL
Nonstop2h 59m
Multiple Airlines
Deal found 1/15$67
This Cheapflightsfares deal was found by Cheapflights users on 1/14. 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.
Thu 2/268:01 pm
PHL
-
MIA
Nonstop2h 53m
Frontier
Sat 2/288:15 am
MIA
-
PHL
Nonstop2h 56m
Frontier
Deal found 1/14$68
This Cheapflightsfares deal was found by Cheapflights users on 1/14. 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.
Sat 2/79:52 am
PHL
-
MIA
Nonstop3h 04m
Spirit Airlines
Sat 2/141:38 pm
MIA
-
PHL
Nonstop2h 48m
Spirit Airlines
Deal found 1/14$69
This CheapOair deal was found by Cheapflights users on 1/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/279:39 am
PHL
-
MIA
Nonstop3h 04m
Spirit Airlines
Wed 3/41:38 pm
MIA
-
PHL
Nonstop2h 48m
Spirit Airlines
Deal found 1/14$70
This CheapOair deal was found by Cheapflights users on 1/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/208:27 pm
PHL
-
MIA
Nonstop2h 53m
Frontier
Sat 2/218:15 am
MIA
-
PHL
Nonstop2h 56m
Frontier
Deal found 1/14$71
This Frontier deal was found by Cheapflights users on 1/14. 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.
Tue 3/106:26 pm
PHL
-
MIA
Nonstop2h 58m
Frontier
Wed 3/1810:20 pm
MIA
-
PHL
Nonstop2h 55m
Frontier
Deal found 1/14$72
This CheapOair deal was found by Cheapflights users on 1/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/167:30 am
PHL
-
MIA
Nonstop3h 03m
Frontier
Fri 2/2011:38 am
MIA
-
PHL
Nonstop3h 00m
Frontier
Deal found 1/14$73
This Cheapflightsfares deal was found by Cheapflights users on 1/14. 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.
Tue 1/272:58 pm
PHL
-
MIA
Nonstop2h 56m
Frontier
Wed 2/112:16 pm
MIA
-
PHL
Nonstop2h 59m
Frontier
Deal found 1/14$74
This CheapOair deal was found by Cheapflights users on 1/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/314:27 pm
PHL
-
MIA
Nonstop3h 03m
Frontier
Tue 2/102:16 pm
MIA
-
PHL
Nonstop2h 59m
Frontier
Deal found 1/14$75
This Trip.com deal was found by Cheapflights users on 1/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/159:08 pm
PHL
-
MIA
Nonstop2h 57m
Multiple Airlines
Wed 2/181:38 pm
MIA
-
PHL
Nonstop2h 48m
Multiple Airlines
Deal found 1/14$76

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 January 15, 2026.
Use the filters below to find and compare flights from Philadelphia to Key Largo that are best for you.

Fly from

Philadelphia

Fly to

Key Largo

Route

Depart

Return

Price

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Thu 2/26

6:01 pm-8:59 pm

Nonstop2h 58m

Miami

Mon 3/2

5:05 am-11:18 am

1 stop6h 13m

$140

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Fri 2/27

5:01 am-8:00 am

Nonstop2h 59m

Miami

Sun 3/1

7:05 am-11:18 am

1 stop28h 13m

$145

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sun 2/8

7:45 am-11:29 pm

1 stop15h 44m

Miami

Tue 2/10

2:16 pm-5:15 pm

Nonstop2h 59m

$175

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Mon 2/9

9:52 am-12:56 pm

Nonstop3h 04m

Miami

Sun 2/15

1:38 pm-4:26 pm

Nonstop2h 48m

$180

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sat 3/21

5:15 am-8:07 pm

2 stops14h 52m

Miami

Sun 3/29

10:20 pm-1:15 am

Nonstop2h 55m

$193

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Thu 4/9

9:53 am-12:47 pm

Nonstop2h 54m

Miami

Sat 4/18

2:04 pm-4:52 pm

Nonstop2h 48m

$194

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Thu 4/9

9:01 am-12:00 pm

Nonstop2h 59m

Miami

Sat 4/18

7:35 am-10:59 pm

1 stop15h 24m

$201

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Thu 2/19

5:30 am-12:16 pm

1 stop6h 46m

Miami

Mon 2/23

7:50 am-1:01 am

2 stops17h 11m

$202

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Tue 2/10

10:30 am-5:15 pm

1 stop6h 45m

Miami

Tue 2/17

6:00 am-11:06 am

1 stop5h 06m

$209

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Sun 2/8

6:18 pm-11:59 pm

2 stops29h 41m

Miami

Tue 2/10

6:45 am-11:50 pm

2 stops17h 05m

$215

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/13

Showing 1-10 of 20 results
1
2

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

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

Use this chart to determine the optimal time to book a round-trip flight from Philadelphia to Key Largo. Price data was last updated on January 9, 2026.

Booking 46 days in advance of your planned departure date is, on average, the best time to get cheap flights from Philadelphia to Key Largo. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, March is the cheapest month in which you can book a flight from Philadelphia to Key Largo (average of $36). Flying from Philadelphia to Key Largo in June is currently the most expensive (average of $75). 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 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 January 15, 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 51% 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 January 10, 2026.

Travelers seeking maximum savings on their Philadelphia to Key Largo flight should consider departing on Monday at noon when fares are most often at their lowest. Saturday at noon 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 January 15, 2026.

The most flights from PHL to KE9 are scheduled on a Thursday (25 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (21 on average).

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 January 15, 2026.
Read through reviews of airlines operating flights from Philadelphia to Key Largo, such as Delta, American Airlines, and JetBlue. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,051 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.8

Comfort

7.9

Food

7.2

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Delta
7.9
Good
8,051 reviews
Delta
7.9
Good
8,051 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.8

Comfort

7.9

Food

7.2

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
American Airlines
7.2
Good
11,136 reviews
Delta
7.9
Good
8,051 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.8

Comfort

7.9

Food

7.2

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
JetBlue
7.2
Good
2,887 reviews
Delta
7.9
Good
8,051 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.8

Comfort

7.9

Food

7.2

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Spirit Airlines
6.3
Okay
8,322 reviews
Delta
7.9
Good
8,051 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.8

Comfort

7.9

Food

7.2

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Frontier
5.7
Fair
3,057 reviews
Delta
7.9
Good
8,051 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.8

Comfort

7.9

Food

7.2

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.

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 23 flights from Philadelphia to Key Largo per day from 9 different airlines.

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

    Flights from Philadelphia to Key Largo have been viewed 278 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 2h 58m. The distance between Philadelphia and Key Largo is about 1015 mi. Most flights are nonstop.

  • 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 $34. Users have also found prices from $38 and $55 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: Malaysia Airlines (91%), Qatar Airways (86%), Iberia (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 $609, our data indicates the cheapest price to be $37. The most popular route (Philadelphia - Miami), is priced around $58.

  • 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.

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

    Currently, March is the cheapest month in which you can book a flight from Philadelphia to Key Largo (average of $36). Flying from Philadelphia to Key Largo in June is currently the most expensive (average of $75). 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

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 Philadelphia to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Fort Lauderdale flights
John F Kennedy Intl to Miami flights
Newark to Miami flights
Newark to Fort Lauderdale flights
LaGuardia to Fort Lauderdale flights
LaGuardia to Miami flights
John F Kennedy Intl to West Palm Beach flights
Newark to West Palm Beach flights
John F Kennedy Intl to Orlando flights
Newark to Orlando flights
John F Kennedy Intl to Tampa flights
Newark to Tampa flights
LaGuardia to Orlando flights
Reagan-National to Miami flights
LaGuardia to Tampa flights
Dulles Intl to Miami flights
Dulles Intl to Orlando flights
Philadelphia to Miami flights
LaGuardia to West Palm Beach flights
Philadelphia to Orlando flights
Philadelphia to Fort Lauderdale flights
Newark to Fort Myers flights
Dulles Intl to Fort Lauderdale flights
Reagan-National to Fort Lauderdale flights
Reagan-National to Orlando flights
Dulles Intl to Tampa flights
John F Kennedy Intl to Fort Myers flights
LaGuardia to Fort Myers flights
Reagan-National to Tampa flights
Newark to Sarasota flights
Philadelphia to Tampa flights
John F Kennedy Intl to Sarasota flights
LaGuardia to Sarasota flights
John F Kennedy Intl to Jacksonville flights
Newark to Jacksonville flights
Pittsburgh to Orlando flights
Newark to Key West flights
Dulles Intl to Fort Myers flights
Reagan-National to West Palm Beach flights
LaGuardia to Jacksonville flights
Dulles Intl to West Palm Beach flights
Philadelphia to West Palm Beach flights
Pittsburgh to Fort Lauderdale flights
Pittsburgh to Tampa flights
John F Kennedy Intl to Daytona Beach flights
Reagan-National to Fort Myers flights
Philadelphia to Fort Myers flights
Pittsburgh to Miami flights
John F Kennedy Intl to Key West flights
LaGuardia to Key West flights

Top 9 airlines flying from Philadelphia to Key Largo

Discover the top 9 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 January 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$40Average$137FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$55Average$225FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$64Average$171FlexibilityNo cancel feeOn-time65%
Allegiant AirCheapest$95Average$168FlexibilityNo cancel feeOn-time88%
DeltaCheapest$115Average$401FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$134Average$308FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$155Average$425FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$236Average$363FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$243Average$341FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.