HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Heidelberg

$1,198+ 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 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — FRA
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to Heidelberg 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.

Cheap flight deals from Islip to Heidelberg

Best flights from Islip to Heidelberg
Discover carefully curated flight deals from Islip to Heidelberg that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 15, 2025.

This Expedia deal was found by Cheapflights users on 12/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/2710:00 amISP - FRA
2 stops42h 05mMultiple Airlines
Tue 2/310:45 amFRA - ISP
2 stops28h 07mMultiple Airlines
Deal found 12/13$1,198
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/2912:30 pmISP - FRA
1 stop11h 05mMultiple Airlines
Thu 2/57:05 pmFRA - ISP
2 stops31h 42mMultiple Airlines
Deal found 12/14$1,899

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 December 15, 2025.

Most accurate provider

Expedia
2 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$1,198
(Expedia)

Popular in

December

Cheapest in

January

Average price

$937
Provider with most accurate pricing for New York (NYC)-Frankfurt am Main flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Frankfurt am Main flights.
Search Deals
From Islip Long Island to Heidelberg
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($2 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 15, 2025.
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

Tue 1/27

10:00 am-10:05 am

2 stops42h 05m

Frankfurt am Main

Tue 2/3

10:45 am-8:52 am

2 stops28h 07m

$1,198

IslipFrankfurt am Main

ISP - FRA

ISPFRA

Islip Long Island

Thu 1/29

12:30 pm-5:35 am

1 stop11h 05m

Frankfurt am Main

Thu 2/5

7:05 pm-8:47 pm

2 stops31h 42m

$1,899

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

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 $300). 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 $300). 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

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 Islip to Heidelberg

See prices for flight routes from nearby airports that may be better suited for you.
Newark to Frankfurt flights
John F Kennedy Intl to Frankfurt flights
LaGuardia to Frankfurt flights
John F Kennedy Intl to Munich flights
Newark to Munich flights
LaGuardia to Munich flights
John F Kennedy Intl to Stuttgart flights
Newark to Stuttgart flights
LaGuardia to Stuttgart flights
Rochester to Frankfurt flights
Buffalo to Frankfurt flights
Albany to Munich flights
Rochester to Munich flights
Syracuse to Munich flights
White Plains to Munich flights
Buffalo to Munich flights
Ithaca to Frankfurt flights
Stewart to Stuttgart flights
Newark to Karlsruhe flights
Islip to Munich flights
Ithaca to Munich flights
Elmira to Munich flights
Elmira to Frankfurt flights
Binghamton to Stuttgart flights
Islip to Frankfurt flights
Binghamton to Munich flights
Stewart to Frankfurt flights
Stewart to Munich flights
Binghamton to Frankfurt flights
Watertown to Munich flights

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.