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Cheap flights from St. Louis to Helsinki from $320

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Helsinki departing on 9/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from St. Louis to Helsinki

Cheap round-trip flights

Multiple Airlines Logo
8:49 am - 10:45 amSTL-HEL
17h 56m1 stop
Multiple Airlines Logo
4:50 pm - 9:46 amHEL-STL
23h 56m1 stop
$432Multiple Airlines
Find Deal
Sun, Oct 19 - Tue, Oct 28
Multiple Airlines Logo
8:49 am - 10:45 amSTL-HEL
17h 56m1 stop
Multiple Airlines Logo
12:30 pm - 8:53 pmHEL-STL
15h 23m1 stop
$433Multiple Airlines
Find Deal
Sun, Oct 19 - Tue, Oct 28
Delta Logo
9:31 am - 10:35 amSTL-HEL
17h 04m2 stops
Delta Logo
6:30 am - 8:08 pmHEL-STL
20h 38m2 stops
$474Delta
Find Deal
Tue, Oct 21 - Fri, Oct 31
Delta Logo
9:31 am - 10:35 amSTL-HEL
17h 04m2 stops
Delta Logo
2:05 pm - 2:43 pmHEL-STL
31h 38m2 stops
$475Delta
Find Deal
Tue, Oct 21 - Tue, Oct 28
United Airlines Logo
11:49 am - 12:00 pmSTL-HEL
17h 11m2 stops
United Airlines Logo
6:55 am - 3:29 pmHEL-STL
40h 34m2 stops
$532United Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
United Airlines Logo
6:30 am - 11:55 amSTL-HEL
21h 25m2 stops
United Airlines Logo
1:55 pm - 2:55 pmHEL-STL
32h 00m1 stop
$556United Airlines
Find Deal
Sun, Oct 19 - Tue, Oct 28
American Airlines Logo
10:10 am - 10:45 amSTL-HEL
16h 35m1 stop
American Airlines Logo
12:30 pm - 8:53 pmHEL-STL
15h 23m1 stop
$624American Airlines
Find Deal
Mon, Oct 20 - Tue, Oct 28
American Airlines Logo
12:23 pm - 10:45 amSTL-HEL
15h 22m1 stop
American Airlines Logo
7:35 am - 8:21 pmHEL-STL
20h 46m2 stops
$634American Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
Lufthansa Logo
3:30 pm - 12:50 pmSTL-HEL
13h 20m1 stop
Lufthansa Logo
6:55 am - 5:39 pmHEL-STL
17h 44m2 stops
$646Lufthansa
Find Deal
Sun, Oct 19 - Wed, Oct 29
Lufthansa Logo
5:28 pm - 6:55 pmSTL-HEL
17h 27m2 stops
Lufthansa Logo
1:55 pm - 2:55 pmHEL-STL
32h 00m1 stop
$662Lufthansa
Find Deal
Mon, Oct 20 - Tue, Oct 28

United Airlines flights from St. Louis to Helsinki

Our best United Airlines deals on St. Louis to Helsinki flight tickets
United Airlines
Oct 30
STL11:49 amLambert-St Louis
17h 11m
2 stops
HEL12:00 pmHelsinki-Vantaa
Nov 6
HEL6:55 amHelsinki-Vantaa
40h 34m
2 stops
STL3:29 pmLambert-St Louis
$532
Find similar
United Airlines
Oct 19
STL6:30 amLambert-St Louis
21h 25m
2 stops
HEL11:55 amHelsinki-Vantaa
Oct 28
HEL1:55 pmHelsinki-Vantaa
32h 00m
1 stop
STL2:55 pmLambert-St Louis
$556
Find similar
United Airlines
Nov 1
STL4:48 pmLambert-St Louis
60h 12m
2 stops
HEL12:00 pmHelsinki-Vantaa
Nov 8
HEL1:50 pmHelsinki-Vantaa
32h 05m
1 stop
STL1:55 pmLambert-St Louis
$631
Find similar

American Airlines flights from St. Louis to Helsinki

Our best American Airlines deals on St. Louis to Helsinki flight tickets
American Airlines
Oct 20
STL10:10 amLambert-St Louis
16h 35m
1 stop
HEL10:45 amHelsinki-Vantaa
Oct 28
HEL12:30 pmHelsinki-Vantaa
15h 23m
1 stop
STL8:53 pmLambert-St Louis
$624
Find similar
American Airlines
Oct 30
STL12:23 pmLambert-St Louis
15h 22m
1 stop
HEL10:45 amHelsinki-Vantaa
Nov 6
HEL7:35 amHelsinki-Vantaa
20h 46m
2 stops
STL8:21 pmLambert-St Louis
$634
Find similar
American Airlines
Oct 16
STL12:23 pmLambert-St Louis
14h 22m
1 stop
HEL10:45 amHelsinki-Vantaa
Oct 29
HEL12:30 pmHelsinki-Vantaa
15h 23m
1 stop
STL8:53 pmLambert-St Louis
$674
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Helsinki 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, momondo users made 832,500 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from St. Louis to Helsinki that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 10/19

8:49 am-10:45 am

1 stop17h 56m

Helsinki-Vantaa

Tue 10/28

4:50 pm-9:46 am

1 stop23h 56m

$432

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 10/19

8:49 am-10:45 am

1 stop17h 56m

Helsinki-Vantaa

Tue 10/28

12:30 pm-8:53 pm

1 stop15h 23m

$433

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Tue 10/21

9:31 am-10:35 am

2 stops17h 04m

Helsinki-Vantaa

Fri 10/31

6:30 am-8:08 pm

2 stops20h 38m

$474

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Tue 10/21

9:31 am-10:35 am

2 stops17h 04m

Helsinki-Vantaa

Tue 10/28

2:05 pm-2:43 pm

2 stops31h 38m

$475

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Thu 10/30

11:49 am-12:00 pm

2 stops17h 11m

Helsinki-Vantaa

Thu 11/6

6:55 am-3:29 pm

2 stops40h 34m

$532

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 10/19

6:30 am-11:55 am

2 stops21h 25m

Helsinki-Vantaa

Tue 10/28

1:55 pm-2:55 pm

1 stop32h 00m

$556

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Mon 10/20

10:10 am-10:45 am

1 stop16h 35m

Helsinki-Vantaa

Tue 10/28

12:30 pm-8:53 pm

1 stop15h 23m

$624

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Thu 10/30

12:23 pm-10:45 am

1 stop15h 22m

Helsinki-Vantaa

Thu 11/6

7:35 am-8:21 pm

2 stops20h 46m

$634

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 10/19

3:30 pm-12:50 pm

1 stop13h 20m

Helsinki-Vantaa

Wed 10/29

6:55 am-5:39 pm

2 stops17h 44m

$646

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Mon 10/20

5:28 pm-6:55 pm

2 stops17h 27m

Helsinki-Vantaa

Tue 10/28

1:55 pm-2:55 pm

1 stop32h 00m

$662

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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See travel insights to Helsinki from

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

What is the typical price of a round-trip flight between St. Louis and Helsinki?

What is the cheapest day to depart on your flight to Helsinki?

The cheapest day to depart on your flight to Helsinki is on a Tuesday when prices can be found for as low as $511. This is often the case because there is less demand to fly during this day of the week. Flights from St. Louis to Helsinki on a Wednesday will generally be more expensive and average around $1,482. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Helsinki?

According to our data, the cheapest time of day to fly to Helsinki is in the morning. momondo users have found flights departing from St. Louis to Helsinki in the morning for as low as $706. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. At noon is when there is more demand to fly to Helsinki, so prices are often more expensive at around $1,476 per ticket.

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

You could potentially save up to 23% 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

Direct flights

None
There are no direct flights from St. Louis to Helsinki. There are no popular flight routes from St. Louis to Helsinki.
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  • 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. 13h 20m 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?

  • 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?

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
American AirlinesPriceFrom $479Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
LufthansaPriceFrom $533Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
United AirlinesPriceFrom $551Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights

Traveling to a place near Helsinki?

Book flights to Helsinki if you plan to visit one of these locations
Vantaa
Espoo
Kotka
Lahti

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Helsinki. Millions of users trust and use momondo every year so you are in good hands.

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.

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