$39+ 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 12/22. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — MIA
Jan 4 — Jan 111
1 adult, Economy
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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 20 days in advance, depart on a Friday or Thursday and return on a Friday
Cheap flight deals from Philadelphia to Key Largo
Cheapest flights from Philadelphia to Key LargoExplore 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 December 5, 2025.
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 December 5, 2025.
This Kiwi.com deal was found by Cheapflights users on 12/2. 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 12/215:52 pmPHL - MIA
Nonstop2h 58mMultiple Airlines
Mon 12/228:40 pmMIA - PHL
Nonstop2h 54mMultiple Airlines
Deal found 12/2![Multiple Airlines logo]()
$69
This Super.com deal was found by Cheapflights users on 12/2. 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.
Fri 12/123:49 pmPHL - MIA
Nonstop2h 58mFrontier
Thu 1/810:24 pmMIA - PHL
Nonstop2h 50mFrontier
Deal found 12/2![Frontier logo]()
$71
This Frontier deal was found by Cheapflights users on 12/4. 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.
Mon 12/1511:07 amPHL - MIA
Nonstop3h 00mFrontier
Tue 12/309:28 pmMIA - PHL
Nonstop2h 58mFrontier
Deal found 12/4![Frontier logo]()
$72
This CheapOair deal was found by Cheapflights users on 12/3. 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.
Thu 12/410:22 amPHL - MIA
Nonstop3h 04mSpirit Airlines
Sat 12/208:40 pmMIA - PHL
Nonstop2h 54mSpirit Airlines
Deal found 12/3![Spirit Airlines logo]()
$74
This Priceline deal was found by Cheapflights users on 12/2. 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.
Sun 12/215:52 pmPHL - MIA
Nonstop2h 58mMultiple Airlines
Thu 12/258:40 pmMIA - PHL
Nonstop2h 54mMultiple Airlines
Deal found 12/2![Multiple Airlines logo]()
$75
This Mytrip deal was found by Cheapflights users on 12/3. 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.
Wed 12/315:17 amPHL - MIA
Nonstop2h 58mMultiple Airlines
Wed 1/712:16 pmMIA - PHL
Nonstop2h 59mMultiple Airlines
Deal found 12/3![Multiple Airlines logo]()
$77
This Cheapflightsfares deal was found by Cheapflights users on 12/3. 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.
Mon 12/811:07 amPHL - MIA
Nonstop3h 00mFrontier
Fri 12/127:57 pmMIA - PHL
Nonstop3h 00mFrontier
Deal found 12/3![Frontier logo]()
$78
This CheapOair deal was found by Cheapflights users on 12/3. 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 12/1510:22 amPHL - MIA
Nonstop3h 04mSpirit Airlines
Thu 12/188:40 pmMIA - PHL
Nonstop2h 54mSpirit Airlines
Deal found 12/3![Spirit Airlines logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 12/4. 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 12/226:22 pmPHL - MIA
Nonstop3h 08mMultiple Airlines
Thu 12/258:40 pmMIA - PHL
Nonstop2h 54mMultiple Airlines
Deal found 12/4![Multiple Airlines logo]()
$82
This Cheapflightsfares deal was found by Cheapflights users on 12/3. 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.
Fri 12/123:49 pmPHL - MIA
Nonstop2h 58mFrontier
Mon 12/153:47 pmMIA - PHL
Nonstop2h 51mFrontier
Deal found 12/3![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 12/4. 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.
Wed 12/315:17 amPHL - MIA
Nonstop2h 58mMultiple Airlines
Mon 1/1210:24 pmMIA - PHL
Nonstop2h 50mMultiple Airlines
Deal found 12/4![Multiple Airlines logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 12/4. 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 12/1511:07 amPHL - MIA
Nonstop3h 00mMultiple Airlines
Tue 12/301:41 pmMIA - PHL
1 stop5h 28mMultiple Airlines
Deal found 12/4![Multiple Airlines logo]()
$86
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 December 5, 2025.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $69 (Kiwi.com) |
One-way from | $39 (Frontier) |
Popular in | June |
Cheapest in | September |
Average price | $263 |
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 December 5, 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
Wed 1/7
6:10 am-1:35 pm
1 stop7h 25m
Miami
Tue 1/27
7:55 am-5:05 pm
2 stops9h 10m
$193
PhiladelphiaMiami
PHL - MIA
PHLMIA
Philadelphia
Mon 2/23
5:25 am-1:10 pm
1 stop7h 45m
Miami
Fri 2/27
7:25 am-6:05 pm
2 stops10h 40m
$234
PhiladelphiaMiami
PHL - MIA
PHLMIA
Philadelphia
Sat 1/24
12:40 pm-9:30 pm
1 stop8h 50m
Miami
Fri 1/30
7:55 am-8:20 pm
2 stops12h 25m
$247
PhiladelphiaMiami
PHL - MIA
PHLMIA
Philadelphia
Fri 1/9
12:41 pm-9:37 pm
1 stop8h 56m
Miami
Mon 1/12
5:50 am-1:24 pm
1 stop7h 34m
$299
PhiladelphiaMiami
PHL - MIA
PHLMIA
Philadelphia
Wed 12/31
7:15 am-12:05 pm
1 stop4h 50m
Miami
Thu 1/8
7:55 am-1:10 pm
1 stop5h 15m
$307
PhiladelphiaMiami
PHL - MIA
PHLMIA
Philadelphia
Mon 1/5
12:35 pm-11:25 pm
2 stops10h 50m
Miami
Sat 1/10
6:45 am-11:10 am
1 stop4h 25m
$307
PhiladelphiaMiami
PHL - MIA
PHLMIA
Philadelphia
Tue 1/6
6:30 am-10:20 pm
2 stops15h 50m
Miami
Wed 1/14
9:00 am-9:36 pm
1 stop12h 36m
$326
PhiladelphiaMiami
PHL - MIA
PHLMIA
Philadelphia
Tue 1/6
6:30 am-10:20 pm
2 stops15h 50m
Miami
Tue 1/13
12:18 pm-2:31 pm
1 stop26h 13m
$326
PhiladelphiaMiami
PHL - MIA
PHLMIA
Philadelphia
Tue 1/6
6:30 am-10:20 pm
2 stops15h 50m
Miami
Thu 1/8
9:00 am-9:36 pm
1 stop12h 36m
$333
PhiladelphiaMiami
PHL - MIA
PHLMIA
Philadelphia
Thu 1/22
12:15 pm-8:05 pm
2 stops7h 50m
Miami
Sun 1/25
7:35 am-4:35 pm
2 stops9h 00m
$333
Showing 1-10 of 23 results
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 November 28, 2025.
Booking 20 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, December is the cheapest month in which you can book a flight from Philadelphia to Key Largo (average of $21). 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 December 5, 2025.
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 47% 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 December 16, 2024.
Travelers seeking maximum savings on their Philadelphia to Key Largo flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Tuesday 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 December 5, 2025.
The most flights from PHL to KE9 are scheduled on a Friday (24 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 December 5, 2025.
Read through reviews of airlines operating flights from Philadelphia to Key Largo, such as Southwest, Delta, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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.
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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.
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 December 5, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$62 | Average$175 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$69 | Average$228 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$77 | Average$180 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$102 | Average$235 | FlexibilityNo cancel fee | On-time88% | |
| Cheapest$145 | Average$308 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$161 | Average$432 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$196 | Average$387 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$236 | Average$421 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$243 | Average$315 | FlexibilityNo cancel fee | On-time75% |