Which layover airport has the shortest connection time from St. Louis to Helsinki?

Frankfurt am Main (FRA) has the shortest average layover time for this route: 2h 18m.

Which layover airport offers the lowest fares from St. Louis to Helsinki?

Flights via Dallas (DFW) offer the lowest average round-trip price of $651.

Which airport is the most popular layover for flights between St. Louis and Helsinki?

Dallas (DFW) was the most common stop: 57% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest travel time from St. Louis to Helsinki?

Flights connecting via Chicago (ORD) have the shortest average one-way travel time: 12h 36m.

What is the cheapest airline that flies from Lambert-St Louis to Helsinki-Vantaa?

Lufthansa and American Airlines are the most popular carriers operating from Lambert-St Louis to Helsinki-Vantaa

When did momondo last update prices for flights from Lambert-St Louis Airport to Helsinki-Vantaa Airport?

Prices for flights from Lambert-St Louis Airport to Helsinki-Vantaa Airport refresh daily.

How many operators does momondo search for flights from Lambert-St Louis Airport to Helsinki-Vantaa Airport?

There are 2 operators available for flights from Lambert-St Louis Airport to Helsinki-Vantaa Airport as of August 2026.

How old do you have to be to fly from Lambert-St Louis Airport to Helsinki-Vantaa Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Helsinki-Vantaa Airport.

What documentation or ID do you need to fly to Helsinki-Vantaa Airport?

The necessary travel and health documents for your Helsinki-Vantaa Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$308 Cheap Flights from St. Louis to Helsinki in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Helsinki

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:54 pm - 3:30 pmSTL Lambert-St Louis-HEL Helsinki-Vantaa

16h 36m2 stops Boston Logan Intl Madrid Barajas

12:30 pm - 7:41 pmHEL Helsinki-Vantaa-STL Lambert-St Louis

15h 11m1 stop Dallas/Fort Worth

$716Iberia

Mon, Jan 25 - Fri, Jan 29

1:08 pm - 12:55 pmSTL Lambert-St Louis-HEL Helsinki-Vantaa

15h 47m2 stops Chicago O'Hare Intl Frankfurt am Main

7:05 am - 1:45 pmHEL Helsinki-Vantaa-STL Lambert-St Louis

14h 40m1 stop Frankfurt am Main

$736Lufthansa

Mon, Jan 25 - Fri, Jan 29

1:08 pm - 12:55 pmSTL Lambert-St Louis-HEL Helsinki-Vantaa

15h 47m2 stops Chicago O'Hare Intl Frankfurt am Main

7:05 am - 7:40 pmHEL Helsinki-Vantaa-STL Lambert-St Louis

20h 35m2 stops Frankfurt am Main Newark

$739Lufthansa

Mon, Jan 25 - Fri, Jan 29

2:54 pm - 3:30 pmSTL Lambert-St Louis-HEL Helsinki-Vantaa

16h 36m2 stops Boston Logan Intl Madrid Barajas

12:30 pm - 7:41 pmHEL Helsinki-Vantaa-STL Lambert-St Louis

15h 11m1 stop Dallas/Fort Worth

$740Iberia

Mon, Jan 25 - Fri, Jan 29

1:49 pm - 2:15 pmSTL Lambert-St Louis-HEL Helsinki-Vantaa

16h 26m1 stop Chicago O'Hare Intl

12:35 pm - 9:59 pmHEL Helsinki-Vantaa-STL Lambert-St Louis

17h 24m1 stop Dallas/Fort Worth

$781American Airlines

Tue, Sep 29 - Tue, Oct 6

11:32 am - 1:55 pmSTL Lambert-St Louis-HEL Helsinki-Vantaa

18h 23m2 stops Chicago O'Hare Intl New York John F Kennedy Intl

12:30 pm - 11:59 pmHEL Helsinki-Vantaa-STL Lambert-St Louis

19h 29m2 stops Dallas/Fort Worth Chicago O'Hare Intl

$782American Airlines

Thu, Nov 26 - Fri, Dec 4

1:49 pm - 2:15 pmSTL Lambert-St Louis-HEL Helsinki-Vantaa

16h 26m1 stop Chicago O'Hare Intl

12:20 pm - 9:57 pmHEL Helsinki-Vantaa-STL Lambert-St Louis

17h 37m1 stop Dallas/Fort Worth

$887American Airlines

Thu, Sep 10 - Thu, Sep 17

5:00 am - 11:10 amSTL Lambert-St Louis-HEL Helsinki-Vantaa

22h 10m1 stop Dallas/Fort Worth

12:30 pm - 10:05 pmHEL Helsinki-Vantaa-STL Lambert-St Louis

17h 35m1 stop Dallas/Fort Worth

$928Finnair

Mon, Jan 25 - Fri, Jan 29

12:55 pm - 11:10 amSTL Lambert-St Louis-HEL Helsinki-Vantaa

14h 15m1 stop Dallas/Fort Worth

12:30 pm - 10:05 pmHEL Helsinki-Vantaa-STL Lambert-St Louis

17h 35m1 stop Dallas/Fort Worth

$957Finnair

Mon, Jan 25 - Fri, Jan 29

5:00 am - 11:10 amSTL Lambert-St Louis-HEL Helsinki-Vantaa

22h 10m1 stop Dallas/Fort Worth

12:30 pm - 10:05 pmHEL Helsinki-Vantaa-STL Lambert-St Louis

17h 35m1 stop Dallas/Fort Worth

$957Finnair

Mon, Jan 25 - Fri, Jan 29

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Iberia flights from St. Louis to Helsinki

Our best Iberia deals on St. Louis to Helsinki flight tickets

Iberia

Jan 25

STL2:54 pmLambert-St Louis

16h 36m

2 stops

HEL3:30 pmHelsinki-Vantaa

Jan 29

HEL12:30 pmHelsinki-Vantaa

15h 11m

1 stop

STL7:41 pmLambert-St Louis

$716

Iberia

Jan 25

STL2:54 pmLambert-St Louis

16h 36m

2 stops

HEL3:30 pmHelsinki-Vantaa

Jan 29

HEL12:30 pmHelsinki-Vantaa

15h 11m

1 stop

STL7:41 pmLambert-St Louis

$740

Iberia

Jan 25

STL1:06 pmLambert-St Louis

18h 24m

2 stops

HEL3:30 pmHelsinki-Vantaa

Jan 29

HEL12:30 pmHelsinki-Vantaa

15h 11m

1 stop

STL7:41 pmLambert-St Louis

$988

Lufthansa flights from St. Louis to Helsinki

Our best Lufthansa deals on St. Louis to Helsinki flight tickets

Lufthansa

Jan 25

STL1:08 pmLambert-St Louis

15h 47m

2 stops

HEL12:55 pmHelsinki-Vantaa

Jan 29

HEL7:05 amHelsinki-Vantaa

14h 40m

1 stop

STL1:45 pmLambert-St Louis

$736

Lufthansa

Jan 25

STL1:08 pmLambert-St Louis

15h 47m

2 stops

HEL12:55 pmHelsinki-Vantaa

Jan 29

HEL7:05 amHelsinki-Vantaa

20h 35m

2 stops

STL7:40 pmLambert-St Louis

$739

Lufthansa

Jan 25

STL7:04 pmLambert-St Louis

33h 51m

2 stops

HEL12:55 pmHelsinki-Vantaa

Jan 29

HEL7:05 amHelsinki-Vantaa

14h 40m

1 stop

STL1:45 pmLambert-St Louis

$755

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisHelsinki

STL Lambert-St Louis - HEL Helsinki-Vantaa

STLHEL

Lambert-St Louis

Mon 1/25

2:54 pm-3:30 pm

2 stops16h 36m

Helsinki-Vantaa

Fri 1/29

12:30 pm-7:41 pm

1 stop15h 11m

$716

Quickest round-trip

St. LouisHelsinki

STL Lambert-St Louis - HEL Helsinki-Vantaa

STLHEL

Lambert-St Louis

Mon 1/25

1:08 pm-12:55 pm

2 stops15h 47m

Helsinki-Vantaa

Fri 1/29

7:05 am-1:45 pm

1 stop14h 40m

$736

St. LouisHelsinki

STL Lambert-St Louis - HEL Helsinki-Vantaa

STLHEL

Lambert-St Louis

Mon 1/25

1:08 pm-12:55 pm

2 stops15h 47m

Helsinki-Vantaa

Fri 1/29

7:05 am-7:40 pm

2 stops20h 35m

$739

St. LouisHelsinki

STL Lambert-St Louis - HEL Helsinki-Vantaa

STLHEL

Lambert-St Louis

Mon 1/25

2:54 pm-3:30 pm

2 stops16h 36m

Helsinki-Vantaa

Fri 1/29

12:30 pm-7:41 pm

1 stop15h 11m

$740

St. LouisHelsinki

STL Lambert-St Louis - HEL Helsinki-Vantaa

STLHEL

Lambert-St Louis

Tue 9/29

1:49 pm-2:15 pm

1 stop16h 26m

Helsinki-Vantaa

Tue 10/6

12:35 pm-9:59 pm

1 stop17h 24m

$781

St. LouisHelsinki

STL Lambert-St Louis - HEL Helsinki-Vantaa

STLHEL

Lambert-St Louis

Thu 11/26

11:32 am-1:55 pm

2 stops18h 23m

Helsinki-Vantaa

Fri 12/4

12:30 pm-11:59 pm

2 stops19h 29m

$782

St. LouisHelsinki

STL Lambert-St Louis - HEL Helsinki-Vantaa

STLHEL

Lambert-St Louis

Thu 9/10

1:49 pm-2:15 pm

1 stop16h 26m

Helsinki-Vantaa

Thu 9/17

12:20 pm-9:57 pm

1 stop17h 37m

$887

St. LouisHelsinki

STL Lambert-St Louis - HEL Helsinki-Vantaa

STLHEL

Lambert-St Louis

Mon 1/25

5:00 am-11:10 am

1 stop22h 10m

Helsinki-Vantaa

Fri 1/29

12:30 pm-10:05 pm

1 stop17h 35m

$928

St. LouisHelsinki

STL Lambert-St Louis - HEL Helsinki-Vantaa

STLHEL

Lambert-St Louis

Mon 1/25

12:55 pm-11:10 am

1 stop14h 15m

Helsinki-Vantaa

Fri 1/29

12:30 pm-10:05 pm

1 stop17h 35m

$957

St. LouisHelsinki

STL Lambert-St Louis - HEL Helsinki-Vantaa

STLHEL

Lambert-St Louis

Mon 1/25

5:00 am-11:10 am

1 stop22h 10m

Helsinki-Vantaa

Fri 1/29

12:30 pm-10:05 pm

1 stop17h 35m

$957

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Helsinki

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Layovers

What is the cheapest month to fly to Helsinki?

The month of June is, on average, the cheapest month to fly to Helsinki from St. Louis, with most prices found around $0. If you aren’t able to travel during the month of June, then book flights to Helsinki from St. Louis during January instead. Flights to Helsinki in January, while not as cheap as those in June, still average around $0.

Can stopping save me money on St. Louis to Helsinki flights?

You could potentially save up to 40% on your flight if you consider stops on a St. Louis to Helsinki flight.

When to book flights from St. Louis to Helsinki

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Helsinki according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Helsinki (STL to HEL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Helsinki

Fastest flight time	20h 10m
Direct flights	None

The fastest flight from St. Louis to Helsinki takes 20h 10m

There are no direct flights from St. Louis to Helsinki. There are no popular flight routes from St. Louis to Helsinki.

Search flight deals

Frequently asked questions about flying from St. Louis to Helsinki

How far is Lambert-St Louis to Helsinki-Vantaa by plane?
The distance between Lambert-St Louis and Helsinki-Vantaa is about 4687.3 mi. 20h 10m is a normal flight duration for this route.
When did momondo last update prices for flights from Lambert-St Louis Airport to Helsinki-Vantaa Airport?
Prices for flights from Lambert-St Louis Airport to Helsinki-Vantaa Airport refresh daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Helsinki-Vantaa Airport?
There are 2 operators available for flights from Lambert-St Louis Airport to Helsinki-Vantaa Airport as of August 2026.
How old do you have to be to fly from Lambert-St Louis Airport to Helsinki-Vantaa Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Helsinki-Vantaa Airport.
What documentation or ID do you need to fly to Helsinki-Vantaa Airport?
The necessary travel and health documents for your Helsinki-Vantaa Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from St. Louis to Helsinki?
Based on momondo bookings for flights between St. Louis and Helsinki, the leading airline is American Airlines, making up 58% of the total bookings. Other popular airlines include Finnair with 42%.

Best airlines flying from St. Louis to Helsinki

Compare and see reviews for airlines that fly from St. Louis to Helsinki with momondo

Airline	Rating	Free Cancellation	Price
Finnair	PriceFrom $433	Free Cancellation	Rating 7.6 1,426 reviews		Search Finnair flights
American Airlines	PriceFrom $484	Free Cancellation	Rating 7.1 11,943 reviews		Search American Airlines flights

Vantaa

Espoo

Lahti

Kotka

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Helsinki?

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Can I find flights from St. Louis to Helsinki with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Helsinki from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Helsinki?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Helsinki.

I’m not ready to book a flight from St. Louis to Helsinki right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Helsinki flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.