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$287+ Cheap flights from Key Largo, FL to Heidelberg, Germany

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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — FRA
Oct 14 — Oct 211
Tue 10/14
Tue 10/21
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Heidelberg are usually found in January or February, booked 7 days in advance, depart on a Monday or Tuesday and return on a Tuesday

Cheap flight deals from Key Largo to Heidelberg

Keep the following information in mind while searching for Key Largo to Heidelberg flight deals. Data was last updated September 14, 2025.

Round-trip from

$671
(Mytrip)

One-way from

$287
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$746
From Key Largo to Heidelberg
Search Deals
One-way flight from Key Largo to Heidelberg
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($117 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Key Largo to Heidelberg

Cheapest flights from Key Largo to Heidelberg
Explore the most affordable flight options available from Key Largo to Heidelberg. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 14, 2025.

This Mytrip deal was found by Cheapflights users on 9/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/298:55 pmMIA - FRA
1 stop12h 35mMultiple Airlines
Wed 11/59:20 amFRA - MIA
2 stops35h 10mMultiple Airlines
Deal found 9/14$671
This oojo deal was found by Cheapflights users on 9/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3112:35 amMIA - FRA
1 stop30h 55mTAP AIR PORTUGAL
Sat 11/155:45 pmFRA - MIA
1 stop34h 20mTAP AIR PORTUGAL
Deal found 9/12$672
This oojo deal was found by Cheapflights users on 9/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/268:55 pmMIA - FRA
1 stop17h 50mScandinavian Airlines
Sat 11/18:30 pmFRA - MIA
1 stop27h 35mScandinavian Airlines
Deal found 9/13$673
This oojo deal was found by Cheapflights users on 9/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2812:15 amMIA - FRA
1 stop29h 25mITA Airways
Wed 11/127:05 amFRA - MIA
1 stop15h 10mITA Airways
Deal found 9/12$674
This oojo deal was found by Cheapflights users on 9/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/187:40 pmMIA - FRA
1 stop15h 30mITA Airways
Tue 12/211:50 amFRA - MIA
1 stop15h 05mITA Airways
Deal found 9/12$675
This AirNGo deal was found by Cheapflights users on 9/12. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/119:45 pmMIA - FRA
1 stop31h 25mAir Canada
Sat 10/259:55 amFRA - MIA
1 stop32h 04mAir Canada
Deal found 9/12$678
This Scandinavian Airlines deal was found by Cheapflights users on 9/12. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/298:55 pmMIA - FRA
1 stop12h 35mMultiple Airlines
Wed 11/1210:10 pmFRA - MIA
2 stops31h 22mMultiple Airlines
Deal found 9/12$680
This Gotogate deal was found by Cheapflights users on 9/12. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/129:20 pmMIA - FRA
Nonstop9h 30mCondor
Tue 9/163:30 pmFRA - MIA
Nonstop10h 40mCondor
Deal found 9/12$683
This Scandinavian Airlines deal was found by Cheapflights users on 9/14. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1211:23 amMIA - FRA
2 stops20h 47mMultiple Airlines
Fri 1/910:00 pmFRA - MIA
1 stop26h 05mMultiple Airlines
Deal found 9/14$685
This flugladen.de deal was found by Cheapflights users on 9/12. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/74:40 pmMIA - FRA
2 stops17h 20mMultiple Airlines
Fri 12/59:30 amFRA - MIA
2 stops33h 04mMultiple Airlines
Deal found 9/12$686
This Gotogate deal was found by Cheapflights users on 9/14. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/3010:10 pmMIA - FRA
Nonstop9h 30mCondor
Sat 10/41:15 pmFRA - MIA
Nonstop10h 40mCondor
Deal found 9/14$687

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to Heidelberg 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 September 14, 2025.
Use the filters below to find and compare flights from Key Largo to Heidelberg that are best for you.

Fly from

Key Largo

Fly to

Heidelberg

Route

Depart

Return

Price

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Mon 11/3

7:55 pm-7:45 pm

1 stop17h 50m

Frankfurt am Main

Sat 11/15

7:55 am-11:17 pm

2 stops21h 22m

$680

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Wed 10/29

8:55 pm-2:30 pm

1 stop12h 35m

Frankfurt am Main

Wed 11/12

10:10 pm-11:32 pm

2 stops31h 22m

$681

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Fri 11/14

11:42 am-2:30 pm

2 stops20h 48m

Frankfurt am Main

Sat 11/29

9:20 pm-6:05 pm

1 stop26h 45m

$688

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Tue 11/18

11:42 am-2:30 pm

2 stops20h 48m

Frankfurt am Main

Tue 12/2

7:00 am-6:05 pm

2 stops17h 05m

$692

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Tue 12/23

7:55 pm-2:30 pm

2 stops36h 35m

Frankfurt am Main

Mon 1/5

3:15 pm-6:05 pm

1 stop32h 50m

$693

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Wed 11/19

11:27 am-2:30 pm

2 stops21h 03m

Frankfurt am Main

Sun 11/30

7:55 am-6:05 pm

2 stops16h 10m

$708

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Tue 10/7

4:40 pm-7:55 am

Nonstop9h 15m

Frankfurt am Main

Tue 10/14

9:55 am-12:18 pm

2 stops32h 23m

$716

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Thu 10/9

1:28 pm-9:45 am

1 stop14h 17m

Frankfurt am Main

Tue 10/21

9:55 am-12:18 pm

2 stops32h 23m

$720

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Tue 10/14

4:56 pm-11:45 am

1 stop12h 49m

Frankfurt am Main

Tue 10/21

9:55 am-2:17 pm

2 stops34h 22m

$720

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Tue 10/7

11:16 am-3:10 pm

2 stops21h 54m

Frankfurt am Main

Tue 10/14

10:15 am-11:19 pm

2 stops19h 04m

$722

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 20 results
1
2

Best time to book a flight from Key Largo to Heidelberg

Have a flexible travel schedule? Discover the best time to fly to Heidelberg from Key Largo 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 Key Largo to Heidelberg

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

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Heidelberg. Price data was last updated on September 12, 2025.

Booking 7 days in advance of your planned departure date is, on average, the best time to get cheap flights from Key Largo to Heidelberg. 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 Key Largo to Heidelberg?

Currently, January is the cheapest month in which you can book a flight from Key Largo to Heidelberg (average of $729). Flying from Key Largo to Heidelberg in June is currently the most expensive (average of $1,091). 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 KE9 to HE1?

Find hourly flight availability from Key Largo to Heidelberg. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 14, 2025.

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

What is the cheapest day to fly from Key Largo to Heidelberg?

Use this chart to determine the cheapest time to fly round-trip from Key Largo to Heidelberg. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Key Largo to Heidelberg flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Key Largo to Heidelberg

Explore weekly flight availability from Key Largo to Heidelberg. 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 September 14, 2025.

The most flights from KE9 to HE1 are scheduled on a Saturday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 on average).

Reviews of airlines servicing Heidelberg

Get insights into the airlines that provide service to Heidelberg. 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 Heidelberg. Reviews last updated September 14, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, United Airlines, and Air Europa from Key Largo to Heidelberg to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,931 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Air Europa
7.0
Good
556 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Lufthansa
6.8
Okay
7,409 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Condor
6.3
Okay
364 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from Key Largo to Heidelberg. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the most reliable airlines from Key Largo to Heidelberg?

    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 Key Largo to Heidelberg on time: Condor (82%), Alaska Airlines (82%), Thai Airways (60%).

  • What are the cheapest flights from Key Largo to Heidelberg?

    On average you can expect to pay $1,102 for a flight from Key Largo to Heidelberg. The cheapest flight overall is $392 while the most popular route, (Miami - Frankfurt am Main) is currently priced at $406.

  • Can I find deals for flights from Key Largo to Heidelberg that include hotel bookings?

    Yes. In addition to deals on Key Largo to Heidelberg flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Key Largo to Heidelberg?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Key Largo to Heidelberg.

  • Can I find deals for business class flights from Key Largo to Heidelberg?

    Yes. Cheapflights offers flight deals from Key Largo to Heidelberg 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 Key Largo to Heidelberg?

    Currently, January is the cheapest month in which you can book a flight from Key Largo to Heidelberg (average of $729). Flying from Key Largo to Heidelberg in June is currently the most expensive (average of $1,091). 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

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Top 10 airlines flying from Key Largo to Heidelberg

Discover the top 10 airlines that operate flights from Key Largo to Heidelberg. 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 September 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$433Average$784FlexibilityNo cancel feeOn-timeN/A
CondorCheapest$480Average$740FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$532Average$599FlexibilityNo cancel feeOn-time77%
DeltaCheapest$536Average$885FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$572Average$803FlexibilityNo cancel feeOn-time70%
Air EuropaCheapest$578Average$692FlexibilityNo cancel feeOn-time83%
American AirlinesCheapest$604Average$889FlexibilityNo cancel feeOn-time71%
IberiaCheapest$614Average$712FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$647Average$1,122FlexibilityNo cancel feeOn-time76%
Turkish AirlinesCheapest$676Average$869FlexibilityNo cancel feeOn-time77%

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