In terms of precipitation, rainfall in Heidelberg ranges from 1.6 - 2.8 inches per month. June is typically the wettest month, when rainfall can reach 2.8 in. January is typically the driest time to visit Heidelberg when rainfall is around 1.6 in.

If weather is an important factor for your trip to Heidelberg, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 64.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

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

The cheapest flight price from St. Louis to Heidelberg is $344. On average you can expect to pay $2,213. The most popular route, (Lambert-St Louis - Frankfurt am Main), can usually be booked for $886.

What are the most popular airlines that fly from St. Louis to Heidelberg?

Consider Lufthansa, United Airlines or British Airways when booking your flight. These represent the most popular airlines when flying from St. Louis to Heidelberg.

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 1 outbound flight to Heidelberg per day from 3 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

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.

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Cheapflights Tip: The best prices from Lambert-St Louis to Heidelberg are usually found in March or October, booked 22 days in advance, depart on a Thursday or Tuesday and return on a Wednesday

Find flight deals from St. Louis to Heidelberg

Popular in	June
Cheapest in	March
Average price	$981

Highest demand for flights based on searches. 14% potential increase in price ($216 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($46 potential savings vs. average RT price).

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Average for round-trip flights in October 2026

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Everything you need to know about your flight from St. Louis to Heidelberg

What is the cheapest time of day to fly from STL to HE1?

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

Reviews of airlines servicing Heidelberg

Get a feel of what it's like to fly with United Airlines,Lufthansa, andBritish Airways 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

7.3

Good

10,390 reviews

Reviews

1 / 20

6.0

Good

Hanan,Aug 2023

IAH - FRA

Too much turbulence, I know it’s not the airline’s fault, but it made the flight not comfortable

United Airlines

7.3

Good

10,390 reviews

United Airlines

7.3

Good

10,390 reviews

Reviews

1 / 20

6.0

Good

Hanan,Aug 2023

IAH - FRA

Too much turbulence, I know it’s not the airline’s fault, but it made the flight not comfortable

Lufthansa

6.8

Okay

8,279 reviews

United Airlines

7.3

Good

10,390 reviews

Reviews

1 / 20

6.0

Good

Hanan,Aug 2023

IAH - FRA

Too much turbulence, I know it’s not the airline’s fault, but it made the flight not comfortable

British Airways

6.7

Okay

8,266 reviews

United Airlines

7.3

Good

10,390 reviews

Reviews

1 / 20

6.0

Good

Hanan,Aug 2023

IAH - FRA

Too much turbulence, I know it’s not the airline’s fault, but it made the flight not comfortable

Related info for your journey

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 1 outbound flight to Heidelberg per day from 3 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.
What are the cheapest flights from St. Louis to Heidelberg?
The cheapest flight price from St. Louis to Heidelberg is $344. On average you can expect to pay $2,213. The most popular route, (Lambert-St Louis - Frankfurt am Main), can usually be booked for $886.
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.

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Top 3 airlines flying from St. Louis to Heidelberg

Airline	Cheapest	Average	Flexibility	On-time
British Airways	Cheapest$410	Average$906	FlexibilityNo cancel fee	On-time70%
Lufthansa	Cheapest$858	Average$1,319	FlexibilityNo cancel fee	On-time76%
United Airlines	Cheapest$866	Average$1,461	FlexibilityNo cancel fee	On-time69%

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Find cheap flights from St. Louis to Heidelberg with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Find flight deals from St. Louis to Heidelberg

Popular in

Cheapest in

Average price

Cheapflights Insights

What is the cheapest time of day to fly from STL to HE1?

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

Reviews of airlines servicing Heidelberg

Get a feel of what it's like to fly with United Airlines,Lufthansa, andBritish Airways 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.

Related info for your journey

What airport do you fly from for flights from St. Louis to Heidelberg?

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

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

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

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

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 St. Louis to Heidelberg

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Heidelberg by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from St. Louis to Heidelberg by cabin class

Find flights from St. Louis to Heidelberg, based on your preferred cabin class, be it economy, premium economy, business, or first class.

St. Louis and Heidelberg flights

Browse other St. Louis and Heidelberg flight options. Last updated on October 19, 2026.

Other flights from St. Louis

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Cheap flights from St. Louis (STL) to Heidelberg, Germany

Find cheap flights from St. Louis to Heidelberg with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Find flight deals from St. Louis to Heidelberg

Popular in

Cheapest in

Average price

Cheapflights Insights

What is the cheapest time of day to fly from STL to HE1?

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

Reviews of airlines servicing Heidelberg

Get a feel of what it's like to fly with United Airlines,Lufthansa, andBritish Airways 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.

Related info for your journey

What airport do you fly from for flights from St. Louis to Heidelberg?

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

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

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

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

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 St. Louis to Heidelberg

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Heidelberg by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from St. Louis to Heidelberg by cabin class

Find flights from St. Louis to Heidelberg, based on your preferred cabin class, be it economy, premium economy, business, or first class.

St. Louis and Heidelberg flights

Browse other St. Louis and Heidelberg flight options. Last updated on October 19, 2026.

Other flights from St. Louis

Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on October 19, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

St. Louis to Heidelberg flights

Consider these flights traveling from St. Louis to Heidelberg.

Top 3 airlines flying from St. Louis to Heidelberg

100% Free

Book with Flexibility

Travel Smart