HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Key Largo

$48+ 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 6/30. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — MIA
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 August, booked 15 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 junio 12, 2025.

Round-trip from

$115
(Cheapflightsfares)

One-way from

$48
(FlightHub)

Popular in

December

Cheapest in

September

Average price

$228
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 ($30 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
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 junio 12, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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.
mar. 8/193:51 pmPHL - MIA
Nonstop3h 01mSpirit Airlines
dom. 8/246:00 amMIA - PHL
Nonstop2h 52mSpirit Airlines
Deal found 6/11$115
This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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.
dom. 7/135:36 pmPHL - MIA
Nonstop3h 02mFrontier
sáb. 7/199:42 pmMIA - PHL
Nonstop3h 04mFrontier
Deal found 6/11$127
This Kiwi.com deal was found by Cheapflights users on 6/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/46:45 amPHL - MIA
Nonstop2h 59mMultiple Airlines
mar. 9/95:54 pmMIA - PHL
1 stop6h 01mMultiple Airlines
Deal found 6/9$132
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 7/116:53 amPHL - MIA
1 stop4h 27mAmerican Airlines
vie. 7/111:56 pmMIA - PHL
Nonstop2h 54mAmerican Airlines
Deal found 6/11$144
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/163:45 pmPHL - MIA
1 stop4h 50mSouthwest
sáb. 8/235:50 amMIA - PHL
1 stop9h 20mSouthwest
Deal found 6/10$194
This Delta deal was found by Cheapflights users on 6/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/15:30 amPHL - MIA
1 stop5h 27mDelta
mié. 7/27:22 pmMIA - PHL
1 stop5h 37mDelta
Deal found 6/11$197

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 junio 12, 2025.
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

mar. 8/19

3:51 pm-6:52 pm

Nonstop3h 01m

Miami

dom. 8/24

6:00 am-8:52 am

Nonstop2h 52m

$115

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

dom. 7/13

5:36 pm-8:38 pm

Nonstop3h 02m

Miami

sáb. 7/19

9:42 pm-12:46 am

Nonstop3h 04m

$127

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

jue. 9/4

6:45 am-9:44 am

Nonstop2h 59m

Miami

mar. 9/9

5:54 pm-11:55 pm

1 stop6h 01m

$132

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

vie. 7/11

6:53 am-11:20 am

1 stop4h 27m

Miami

vie. 7/11

1:56 pm-4:50 pm

Nonstop2h 54m

$144

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

lun. 8/25

5:30 am-10:50 am

1 stop5h 20m

Miami

lun. 8/25

4:40 pm-10:10 pm

1 stop5h 30m

$184

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

mar. 7/1

6:23 pm-12:57 am

1 stop6h 34m

Miami

mié. 7/9

5:30 am-10:57 am

1 stop5h 27m

$197

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

lun. 6/30

2:36 pm-5:38 pm

Nonstop3h 02m

$48

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

mié. 8/20

1:52 pm-4:50 pm

Nonstop2h 58m

$49

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

lun. 8/4

5:36 pm-8:38 pm

Nonstop3h 02m

$78

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

jue. 8/21

11:10 am-6:10 pm

1 stop7h 00m

$92

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 12 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 June 9, 2025.

Booking 15 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, September is the cheapest month in which you can book a flight from Philadelphia to Key Largo (average of $228). Flying from Philadelphia to Key Largo in March is currently the most expensive (average of $289). 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 junio 12, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Philadelphia to Key Largo as you normally would.

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 December 16, 2024.

Travelers seeking maximum savings on their Philadelphia to Key Largo flight should consider departing on Sunday evenings when fares are most often at their lowest. Tuesday 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 junio 12, 2025.

The most flights from PHL to KE9 are scheduled on a Tuesday (24 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (14 on average).

Rainfall in Key Largo by month

Plan your trip to Key Largo by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Key Largo ranges from 1.6 - 9.9 inches per month. September is typically the wettest month, when rainfall can reach 9.9 in. January is typically the driest time to visit Key Largo when rainfall is around 1.6 in.

Temperature in Key Largo by month

Plan your trip to Key Largo by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Key Largo, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 68.0 F).

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 junio 12, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta and American Airlines from Philadelphia to Key Largo to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,287 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Delta
8.0
Very good
7,950 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Spirit Airlines
6.3
Okay
8,052 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Frontier
5.9
Fair
3,295 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 22 flights from Philadelphia to Key Largo per day from 10 different airlines.

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

    Flights from Philadelphia to Key Largo have been viewed 251 times in the past calendar month.

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

    For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $48. Users have also found prices from $49 and $78 on American Airlines and Frontier, 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 (90%), Qatar Airways (84%), Iberia (81%).

  • 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 $2,559, our data indicates the cheapest price to be $51. The most popular route (Philadelphia - Miami), is priced around $115.

  • 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, September is the cheapest month in which you can book a flight from Philadelphia to Key Largo (average of $228). Flying from Philadelphia to Key Largo in March is currently the most expensive (average of $289). 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 Miami flights
Newark to Fort Lauderdale flights
John F Kennedy Intl to Orlando flights
Newark to Miami flights
LaGuardia to Miami flights
John F Kennedy Intl to Fort Lauderdale flights
LaGuardia to Fort Lauderdale flights
Newark to Orlando flights
LaGuardia to Orlando flights
John F Kennedy Intl to West Palm Beach flights
Dulles Intl to Miami flights
Philadelphia to Orlando flights
Reagan-National to Miami flights
John F Kennedy Intl to Tampa flights
Newark to Tampa flights
Reagan-National to Orlando flights
Philadelphia to Fort Lauderdale flights
Dulles Intl to Fort Lauderdale flights
LaGuardia to Tampa flights
Newark to West Palm Beach flights
Dulles Intl to Orlando flights
Philadelphia to Miami flights
LaGuardia to West Palm Beach flights
Dulles Intl to Tampa flights
Reagan-National to Fort Lauderdale flights
Newark to Fort Myers flights
Newark to Jacksonville flights
Philadelphia to Tampa flights
LaGuardia to Jacksonville flights
Newark to Sarasota flights
John F Kennedy Intl to Jacksonville flights
LaGuardia to Sarasota flights
Reagan-National to Tampa flights
Dulles Intl to West Palm Beach flights
John F Kennedy Intl to Fort Myers flights
Pittsburgh to Orlando flights
Newark to Key West flights
LaGuardia to Fort Myers flights
Newark to St Petersburg flights
Dulles Intl to Fort Myers flights
Newark to Orlando Sanford Intl flights
John F Kennedy Intl to Sarasota flights
Pittsburgh to Fort Lauderdale flights
Pittsburgh to Miami flights
Philadelphia to Fort Myers flights
Reagan-National to West Palm Beach flights
John F Kennedy Intl to Key West flights
Reagan-National to Sarasota flights
Reagan-National to Fort Myers flights
Philadelphia to Key West flights

Top 10 airlines flying from Philadelphia to Key Largo

Discover the top 10 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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$66Average$172FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$76Average$161FlexibilityNo cancel feeOn-time65%
Allegiant AirCheapest$102Average$306FlexibilityNo cancel feeOn-time88%
JetBlueCheapest$109Average$187FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$134Average$402FlexibilityNo cancel feeOn-time63%
Avelo AirlinesCheapest$136Average$233FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$176Average$419FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$394FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$218Average$444FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$243Average$315FlexibilityNo 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.