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$320+ 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 10/16. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — FRA
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
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 Tuesday or Monday and return on a Thursday

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 July 31, 2025.

Round-trip from

$666
(Mytrip)

One-way from

$320
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$899
From Key Largo to Heidelberg
Search Deals
One-way flight from Key Largo to Heidelberg
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($125 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 July 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 July 31, 2025.

This Mytrip deal was found by Cheapflights users on 7/29. 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 10/2912:35 amMIA - FRA
2 stops28h 10mMultiple Airlines
Thu 11/139:00 amFRA - MIA
1 stop15h 45mMultiple Airlines
Deal found 7/29$666
This oojo deal was found by Cheapflights users on 7/30. 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 8/510:10 pmMIA - FRA
Nonstop9h 30mCondor
Fri 8/153:10 pmFRA - MIA
Nonstop10h 40mCondor
Deal found 7/30$667
This Cheapflightsfares deal was found by Cheapflights users on 7/29. 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.
Wed 8/207:55 amMIA - FRA
1 stop18h 15mAir Canada
Wed 9/2410:00 amFRA - MIA
1 stop17h 34mAir Canada
Deal found 7/29$669
This CrystalTravel deal was found by Cheapflights users on 7/29. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/159:30 pmMIA - FRA
1 stop14h 20mAir Europa
Mon 10/2710:45 amFRA - MIA
1 stop14h 45mAir Europa
Deal found 7/29$672
This Scandinavian Airlines deal was found by Cheapflights users on 7/29. 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 10/227:05 amMIA - FRA
2 stops25h 35mScandinavian Airlines
Tue 11/43:15 pmFRA - MIA
1 stop32h 50mScandinavian Airlines
Deal found 7/29$675
This FlightHub deal was found by Cheapflights users on 7/29. 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.
Wed 10/227:30 pmMIA - FRA
1 stop15h 55mITA Airways
Tue 11/411:50 amFRA - MIA
1 stop15h 05mITA Airways
Deal found 7/29$683
This FlightHub deal was found by Cheapflights users on 7/31. 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.
Wed 10/295:40 pmMIA - FRA
Nonstop9h 05mLufthansa
Wed 11/1210:15 amFRA - MIA
Nonstop10h 25mLufthansa
Deal found 7/31$688
This Cheapflightsfares deal was found by Cheapflights users on 7/29. 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.
Sun 11/211:50 pmMIA - FRA
1 stop16h 50mTAP AIR PORTUGAL
Sun 11/161:25 pmFRA - MIA
1 stop14h 40mTAP AIR PORTUGAL
Deal found 7/29$690
This United Airlines deal was found by Cheapflights users on 7/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/114:40 pmMIA - FRA
Nonstop9h 15mUnited Airlines
Mon 8/2510:45 amFRA - MIA
Nonstop9h 55mUnited Airlines
Deal found 7/30$692
This Iberia deal was found by Cheapflights users on 7/30. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1111:50 amMIA - FRA
1 stop13h 30mIberia
Mon 8/259:20 amFRA - MIA
1 stop17h 36mIberia
Deal found 7/30$697
This oojo deal was found by Cheapflights users on 7/30. 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.
Thu 8/712:46 pmMIA - FRA
2 stops23h 34mBritish Airways
Wed 8/209:20 amFRA - MIA
1 stop13h 32mBritish Airways
Deal found 7/30$707

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 July 31, 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

Wed 10/29

12:35 am-9:45 am

2 stops28h 10m

Frankfurt am Main

Thu 11/13

9:00 am-6:45 pm

1 stop15h 45m

$666

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Tue 8/5

10:10 pm-1:40 pm

Nonstop9h 30m

Frankfurt am Main

Fri 8/15

3:10 pm-7:50 pm

Nonstop10h 40m

$667

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Wed 8/20

7:55 am-8:10 am

1 stop18h 15m

Frankfurt am Main

Wed 9/24

10:00 am-9:34 pm

1 stop17h 34m

$669

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Wed 9/17

11:10 am-2:40 pm

2 stops21h 30m

Frankfurt am Main

Wed 10/1

3:20 pm-11:10 pm

2 stops37h 50m

$671

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Wed 10/15

9:30 pm-5:50 pm

1 stop14h 20m

Frankfurt am Main

Mon 10/27

10:45 am-8:30 pm

1 stop14h 45m

$672

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Wed 10/22

7:30 pm-5:25 pm

1 stop15h 55m

Frankfurt am Main

Tue 11/4

11:50 am-8:55 pm

1 stop15h 05m

$683

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Wed 10/29

5:40 pm-7:45 am

Nonstop9h 05m

Frankfurt am Main

Wed 11/12

10:15 am-2:40 pm

Nonstop10h 25m

$688

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Mon 8/11

4:40 pm-7:55 am

Nonstop9h 15m

Frankfurt am Main

Mon 8/25

10:45 am-2:40 pm

Nonstop9h 55m

$692

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Wed 8/13

10:15 pm-10:00 am

1 stop29h 45m

Frankfurt am Main

Tue 9/2

2:25 pm-8:20 pm

1 stop35h 55m

$694

MiamiFrankfurt am Main

MIA - FRA

MIAFRA

Miami

Mon 8/11

11:50 am-7:20 am

1 stop13h 30m

Frankfurt am Main

Mon 8/25

9:20 am-8:56 pm

1 stop17h 36m

$697

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

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 July 25, 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 $1,088). 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 July 31, 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 July 31, 2025.

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

How much does it cost to fly round-trip from Key Largo to Heidelberg?

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 July 31, 2025.
Peruse reviews from past customers who have flown with SWISS, United Airlines, and Turkish Airlines 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.
SWISS
7.5
Good
1,686 reviews

Boarding

7.7

Food

7.1

Comfort

7.4

Crew

8.2

Overall

7.5

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
SWISS
7.5
Good
1,686 reviews
SWISS
7.5
Good
1,686 reviews

Boarding

7.7

Food

7.1

Comfort

7.4

Crew

8.2

Overall

7.5

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
United Airlines
7.4
Good
8,896 reviews
SWISS
7.5
Good
1,686 reviews

Boarding

7.7

Food

7.1

Comfort

7.4

Crew

8.2

Overall

7.5

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
Turkish Airlines
7.3
Good
3,928 reviews
SWISS
7.5
Good
1,686 reviews

Boarding

7.7

Food

7.1

Comfort

7.4

Crew

8.2

Overall

7.5

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
Scandinavian Airlines
7.3
Good
1,453 reviews
SWISS
7.5
Good
1,686 reviews

Boarding

7.7

Food

7.1

Comfort

7.4

Crew

8.2

Overall

7.5

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
Air Canada
7.1
Good
9,837 reviews
SWISS
7.5
Good
1,686 reviews

Boarding

7.7

Food

7.1

Comfort

7.4

Crew

8.2

Overall

7.5

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.

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 cheapest airlines to fly from Key Largo to Heidelberg one-way?

    For one-way options, check prices for Lufthansa. According to our data, you can fly for as low as $322. Users have also found prices from $335 and $350 on TAP AIR PORTUGAL and British Airways, respectively.

  • 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 (66%), Alaska Airlines (66%), Thai Airways (63%).

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

    On average you can expect to pay $1,733 for a flight from Key Largo to Heidelberg. The cheapest flight overall is $317 while the most popular route, (Miami - Frankfurt am Main) is currently priced at $545.

  • 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 $1,088). 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
CondorCheapest$482Average$743FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$532Average$589FlexibilityNo cancel feeOn-time77%
DeltaCheapest$536Average$885FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$557Average$871FlexibilityNo cancel feeOn-time71%
TAP AIR PORTUGALCheapest$562Average$784FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$572Average$724FlexibilityNo cancel feeOn-time70%
Air EuropaCheapest$578Average$702FlexibilityNo cancel feeOn-time83%
IberiaCheapest$614Average$710FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$653Average$1,127FlexibilityNo cancel feeOn-time76%
Turkish AirlinesCheapest$683Average$885FlexibilityNo cancel feeOn-time77%

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