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Heidelberg

$1,365+ Cheap flights from Islip, NY (ISP) to Heidelberg, Germany

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/13. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — FRA
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
1 adult, Economy
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Cheap flight deals from Islip to Heidelberg

Cheapest flights from Islip to Heidelberg
Explore the most affordable flight options available from Islip to Heidelberg. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.

This oojo deal was found by Cheapflights users on 1/26. 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 3/138:25 pm
ISP
-
FRA
2 stops28h 30m
Multiple Airlines
Fri 3/2011:15 am
FRA
-
ISP
2 stops30h 34m
Multiple Airlines
Deal found 1/26$1,365
This Trip.com deal was found by Cheapflights users on 1/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/129:45 am
ISP
-
FRA
2 stops19h 05m
Multiple Airlines
Thu 3/198:35 am
FRA
-
ISP
2 stops29h 20m
Multiple Airlines
Deal found 1/26$1,400

Find flight deals from Islip to Heidelberg

Keep the following information in mind while searching for Islip to Heidelberg flight deals. Data was last updated January 28, 2026.

Most accurate provider

Expedia
1 star

Most trusted provider

Expedia
3 stars

Round-trip from

$1,365
(oojo)

Popular in

December

Cheapest in

January

Average price

$594
Provider with most accurate pricing for New York (NYC)-Frankfurt am Main flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-Frankfurt am Main flights.
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From Islip Long Island to Heidelberg
Search Deals
High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip 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 January 28, 2026.
Use the filters below to find and compare flights from Islip to Heidelberg that are best for you.

Fly from

Islip

Fly to

Heidelberg

Route

Depart

Return

Price

IslipFrankfurt am Main

ISP - FRA

ISPFRA

Islip Long Island

Fri 3/13

8:25 pm-5:55 am

2 stops28h 30m

Frankfurt am Main

Fri 3/20

11:15 am-12:49 pm

2 stops30h 34m

$1,365

IslipFrankfurt am Main

ISP - FRA

ISPFRA

Islip Long Island

Thu 3/12

9:59 am-12:00 pm

2 stops21h 01m

Frankfurt am Main

Thu 3/19

11:05 am-6:44 pm

1 stop12h 39m

$1,819

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Best time to book a flight from Islip to Heidelberg

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

What is the cheapest month to book a flight from Islip, New York to Heidelberg?

Currently, January is the cheapest month in which you can book a flight from Islip, New York to Heidelberg (average of $294). Flying from Islip, New York to Heidelberg in December is currently the most expensive (average of $591). 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.

Related info for your journey

Find useful and relevant information for your journey from Islip to Heidelberg. 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 Islip to Heidelberg?

    Islip Long Island (ISP) is the airport you will fly out of if you book a flight from Islip to Heidelberg. You should not have trouble finding flights to Heidelberg from Long Island; the airport handles an average of 0 outbound flights to Heidelberg per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Islip airport to Heidelberg. It is only a 7.2 mi journey to Long Island (ISP) from Islip’s city center.

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

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

  • How can I find direct flights from Islip to Heidelberg?

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

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

    Yes. Cheapflights offers flight deals from Islip 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 Islip, New York to Heidelberg?

    Currently, January is the cheapest month in which you can book a flight from Islip, New York to Heidelberg (average of $294). Flying from Islip, New York to Heidelberg in December is currently the most expensive (average of $591). 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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