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Heidelberg

$335+ Cheap flights from St. Louis (STL) 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 2/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — FRA
Jan 20 — Jan 271
Tue 1/20
Tue 1/27
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Heidelberg are usually found in November or October, booked 62 days in advance, depart on a Tuesday or Monday and return on a Friday

Cheap flight deals from St. Louis to Heidelberg

Cheapest flights from St. Louis to Heidelberg
Explore the most affordable flight options available from St. Louis to Heidelberg. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 21, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 12/21. 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 12/283:50 pmSTL - FRA
Nonstop8h 40mLufthansa
Sun 1/48:50 pmFRA - STL
2 stops34h 02mLufthansa
Deal found 12/21$1,830
This Cheapflightsfares deal was found by Cheapflights users on 12/21. 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 12/243:50 pmSTL - FRA
Nonstop8h 40mLufthansa
Wed 1/710:45 amFRA - STL
Nonstop10h 10mLufthansa
Deal found 12/21$1,844
This Kiwi.com deal was found by Cheapflights users on 12/21. 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 12/247:00 amSTL - FRA
1 stop22h 50mMultiple Airlines
Wed 1/711:50 amFRA - STL
2 stops41h 43mMultiple Airlines
Deal found 12/21$1,942
This Cheapflightsfares deal was found by Cheapflights users on 12/20. 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 12/2211:05 amSTL - FRA
2 stops16h 00mLufthansa
Sun 12/2810:45 amFRA - STL
Nonstop10h 10mLufthansa
Deal found 12/20$1,952

Find flight deals from St. Louis to Heidelberg

Keep the following information in mind while searching for St. Louis to Heidelberg flight deals. Data was last updated December 21, 2025.

Round-trip from

$736
(KAYAK)

One-way from

$335
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$1,306
From Lambert-St Louis to Heidelberg
Search Deals
One-way flight from Lambert-St Louis to Heidelberg
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($228 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($38 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis 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 21, 2025.
Use the filters below to find and compare flights from St. Louis to Heidelberg that are best for you.

Fly from

St. Louis

Fly to

Heidelberg

Route

Depart

Return

Price

St. LouisFrankfurt am Main

STL - FRA

STLFRA

Lambert-St Louis

Sun 3/15

4:50 pm-7:30 am

Nonstop8h 40m

Frankfurt am Main

Wed 3/25

10:45 am-2:55 pm

Nonstop10h 10m

$867

St. LouisFrankfurt am Main

STL - FRA

STLFRA

Lambert-St Louis

Fri 2/20

3:15 pm-9:55 am

1 stop11h 40m

Frankfurt am Main

Tue 2/24

5:10 pm-5:44 pm

2 stops31h 34m

$1,053

St. LouisFrankfurt am Main

STL - FRA

STLFRA

Lambert-St Louis

Thu 4/23

1:30 pm-10:00 pm

3 stops25h 30m

Frankfurt am Main

Sat 5/2

7:00 am-11:38 pm

3 stops23h 38m

$1,062

St. LouisFrankfurt am Main

STL - FRA

STLFRA

Lambert-St Louis

Wed 4/1

10:12 am-8:55 am

1 stop15h 43m

Frankfurt am Main

Fri 4/10

11:45 am-11:15 pm

2 stops18h 30m

$1,067

St. LouisFrankfurt am Main

STL - FRA

STLFRA

Lambert-St Louis

Wed 4/1

10:12 am-8:55 am

1 stop15h 43m

Frankfurt am Main

Fri 4/10

10:40 am-5:53 pm

1 stop14h 13m

$1,069

St. LouisFrankfurt am Main

STL - FRA

STLFRA

Lambert-St Louis

Fri 2/20

4:05 pm-3:55 pm

2 stops16h 50m

Frankfurt am Main

Tue 2/24

9:45 am-9:05 pm

2 stops18h 20m

$1,084

St. LouisFrankfurt am Main

STL - FRA

STLFRA

Lambert-St Louis

Thu 4/23

6:38 am-7:55 pm

2 stops30h 17m

Frankfurt am Main

Sat 5/2

10:55 am-11:24 pm

2 stops19h 29m

$1,108

St. LouisFrankfurt am Main

STL - FRA

STLFRA

Lambert-St Louis

Thu 4/30

1:30 pm-2:35 pm

2 stops18h 05m

Frankfurt am Main

Thu 5/7

7:00 am-11:38 pm

3 stops23h 38m

$1,113

St. LouisFrankfurt am Main

STL - FRA

STLFRA

Lambert-St Louis

Thu 4/16

11:14 am-10:15 am

2 stops16h 01m

Frankfurt am Main

Sun 4/26

6:40 am-7:30 pm

1 stop19h 50m

$1,127

St. LouisFrankfurt am Main

STL - FRA

STLFRA

Lambert-St Louis

Sun 4/19

3:30 pm-7:25 am

Nonstop8h 55m

Frankfurt am Main

Sat 4/25

8:45 pm-10:56 pm

2 stops33h 11m

$1,131

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/20

Showing 1-10 of 15 results
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Best time to book a flight from St. Louis to Heidelberg

Have a flexible travel schedule? Discover the best time to fly to Heidelberg from St. Louis 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 St. Louis to Heidelberg

How far ahead should I book a flight from St. Louis to Heidelberg?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Heidelberg. Price data was last updated on December 19, 2025.

The best time to book flights from St. Louis to Heidelberg is 62 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from St. Louis to Heidelberg?

Currently, October is the cheapest month in which you can book a flight from St. Louis to Heidelberg (average of $650). Flying from St. Louis to Heidelberg in April is currently the most expensive (average of $899). 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 STL to HE1?

Find hourly flight availability from St. Louis 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 December 21, 2025.

It’s typically best to fly out from St. Louis to Heidelberg in the evening. Doing so could potentially save you 32% on the flight price compared to flying in the afternoon, which is usually more expensive.

How much does it cost to fly round-trip from St. Louis 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 December 21, 2025.
Get a feel of what it's like to fly with United Airlines, American Airlines, and Air Canada from St. Louis to Heidelberg by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,102 reviews

Crew

8.1

Food

6.6

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
United Airlines
7.4
Good
9,102 reviews
United Airlines
7.4
Good
9,102 reviews

Crew

8.1

Food

6.6

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
American Airlines
7.2
Good
11,051 reviews
United Airlines
7.4
Good
9,102 reviews

Crew

8.1

Food

6.6

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
Air Canada
7.1
Good
10,551 reviews
United Airlines
7.4
Good
9,102 reviews

Crew

8.1

Food

6.6

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
Lufthansa
6.8
Okay
7,643 reviews
United Airlines
7.4
Good
9,102 reviews

Crew

8.1

Food

6.6

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
British Airways
6.7
Okay
7,602 reviews
United Airlines
7.4
Good
9,102 reviews

Crew

8.1

Food

6.6

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Related info for your journey

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

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Heidelberg. On average, Lambert-St Louis has 0 outbound flights to Heidelberg per day from 7 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • How long is the flight from St. Louis to Heidelberg?

    A quick flight from St. Louis to Heidelberg can take about 8h 40m. Lufthansa provides one of the quickest options available for as low as $867. Airlines will cover a distance of 4577 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from St. Louis to Heidelberg one-way?

    The cheapest airline one-way is Lufthansa, with whom users have recently found tickets for as low as $396. However, be on the lookout for offers from United Airlines and British Airways, as they are both options that can get you from St. Louis to Heidelberg for a low price.

  • What are the cheapest flights from St. Louis to Heidelberg?

    The cheapest flight price from St. Louis to Heidelberg is $438. On average you can expect to pay $1,664. The most popular route, (Lambert-St Louis - Frankfurt am Main), can usually be booked for $736.

  • Can I find deals for flights from St. Louis to Heidelberg that include hotel bookings?

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

  • How can I find direct flights from St. Louis to Heidelberg?

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

  • Can I find deals for business class flights from St. Louis to Heidelberg?

    Yes. Cheapflights offers flight deals from St. Louis 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 St. Louis to Heidelberg?

    Currently, October is the cheapest month in which you can book a flight from St. Louis to Heidelberg (average of $650). Flying from St. Louis to Heidelberg in April is currently the most expensive (average of $899). 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 7 airlines flying from St. Louis to Heidelberg

Discover the top 7 airlines that operate flights from St. Louis 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 December 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$488Average$1,024FlexibilityNo cancel feeOn-time71%
DeltaCheapest$610Average$1,099FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$693Average$994FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$776Average$1,135FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$821Average$1,335FlexibilityNo cancel feeOn-time76%
KLMCheapest$841Average$1,115FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$921Average$1,319FlexibilityNo cancel feeOn-time67%

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