HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Key Largo

$54+ 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — MIA
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 August or September, 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 July 29, 2025.

Round-trip from

$109
(Kiwi.com)

One-way from

$54
(Cheapflightsfares)

Popular in

December

Cheapest in

August

Average price

$234
From Philadelphia to Key Largo
Search Deals
One-way flight from Philadelphia to Key Largo
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($24 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 July 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 July 29, 2025.

This CheapOair deal was found by Cheapflights users on 7/28. 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 11/89:11 pmPHL - MIA
Nonstop3h 05mSpirit Airlines
Mon 11/176:00 amMIA - PHL
Nonstop2h 50mSpirit Airlines
Deal found 7/28$109
This CheapOair deal was found by Cheapflights users on 7/28. 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 8/225:43 pmPHL - MIA
Nonstop3h 02mMultiple Airlines
Tue 8/266:50 amMIA - PHL
Nonstop2h 56mMultiple Airlines
Deal found 7/28$110
This FlightHub deal was found by Cheapflights users on 7/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/115:36 pmPHL - MIA
Nonstop3h 02mFrontier
Thu 8/149:42 pmMIA - PHL
Nonstop3h 04mFrontier
Deal found 7/28$112

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 July 29, 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

Tue 8/19

3:51 pm-6:52 pm

Nonstop3h 01m

Miami

Tue 8/26

6:50 am-9:46 am

Nonstop2h 56m

$109

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Thu 8/14

5:36 pm-8:38 pm

Nonstop3h 02m

Miami

Wed 8/27

6:50 am-9:46 am

Nonstop2h 56m

$110

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Fri 8/29

5:43 pm-8:45 pm

Nonstop3h 02m

Miami

Sun 8/31

9:08 am-12:08 pm

Nonstop3h 00m

$112

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Mon 8/11

5:36 pm-8:38 pm

Nonstop3h 02m

$54

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Thu 8/21

3:51 pm-6:52 pm

Nonstop3h 01m

$57

PhiladelphiaMiami

PHL - MIA

PHLMIA

Philadelphia

Tue 8/26

10:30 am-9:15 pm

2 stops10h 45m

$115

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

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 July 25, 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 $232). 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 July 29, 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 July 29, 2025.

The most flights from PHL to KE9 are scheduled on a Monday (24 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (14 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 July 29, 2025.
Read through reviews of airlines operating flights from Philadelphia to Key Largo, such as Southwest, Spirit Airlines, and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

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
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

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
8,040 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

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
4,238 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

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 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 18 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 238 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 Frontier. According to our data, you can fly for as low as $54. Users have also found prices from $57 and $115 on Spirit Airlines and Southwest, 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: United Airlines (100%), Aer Lingus (84%), American Airlines (72%).

  • 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 $603, our data indicates the cheapest price to be $48. The most popular route (Philadelphia - Miami), is priced around $73.

  • 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 $232). 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.
Newark to Fort Lauderdale flights
John F Kennedy Intl to Miami flights
Newark to Miami flights
LaGuardia to Fort Lauderdale flights
John F Kennedy Intl to Orlando flights
Newark to Orlando flights
LaGuardia to Miami flights
John F Kennedy Intl to Fort Lauderdale flights
LaGuardia to Orlando flights
John F Kennedy Intl to West Palm Beach flights
Philadelphia to Orlando flights
Dulles Intl to Miami flights
Newark to Tampa flights
Reagan-National to Miami flights
John F Kennedy Intl to Tampa flights
LaGuardia to Tampa flights
Reagan-National to Orlando flights
Philadelphia to Fort Lauderdale flights
Newark to West Palm Beach flights
LaGuardia to West Palm Beach flights
Dulles Intl to Fort Lauderdale flights
Dulles Intl to Orlando flights
Philadelphia to Miami flights
Dulles Intl to Tampa flights
Reagan-National to Fort Lauderdale flights
Newark to Fort Myers flights
Reagan-National to Tampa flights
John F Kennedy Intl to Fort Myers flights
LaGuardia to Fort Myers flights
Newark to Jacksonville flights
John F Kennedy Intl to Jacksonville flights
Newark to Sarasota flights
Dulles Intl to West Palm Beach flights
Philadelphia to Jacksonville flights
Newark to Key West flights
Pittsburgh to Fort Lauderdale flights
John F Kennedy Intl to Sarasota flights
Pittsburgh to Orlando flights
Dulles Intl to Fort Myers flights
Reagan-National to West Palm Beach flights
Philadelphia to Key West flights
Pittsburgh to Miami flights
LaGuardia to Jacksonville flights
Philadelphia to Fort Myers flights
John F Kennedy Intl to Key West flights
Philadelphia to Tampa flights
Reagan-National to Fort Myers flights
LaGuardia to Sarasota flights
Dulles Intl to Jacksonville flights
Philadelphia to Melbourne 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$55Average$222FlexibilityNo cancel feeOn-time62%
FrontierCheapest$68Average$176FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$79Average$169FlexibilityNo cancel feeOn-time65%
Allegiant AirCheapest$102Average$268FlexibilityNo cancel feeOn-time88%
SouthwestCheapest$134Average$388FlexibilityNo cancel feeOn-time63%
Avelo AirlinesCheapest$136Average$233FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$179Average$423FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$381FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$218Average$463FlexibilityNo 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.