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Cheap flights from St. Louis to Helsinki from $419

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 10/20. 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

Logo
7:01 am - 10:45 amSTL-HEL
19h 44m1 stop
Logo
12:30 pm - 8:53 pmHEL-STL
15h 23m1 stop
$482
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Sun, Oct 19 - Tue, Oct 28
United Airlines Logo
3:30 pm - 4:40 pmSTL-HEL
17h 10m1 stop
United Airlines Logo
7:05 am - 3:29 pmHEL-STL
39h 24m2 stops
$543United Airlines
Find Deal
Sun, Oct 19 - Tue, Oct 28
United Airlines Logo
5:00 am - 11:55 amSTL-HEL
22h 55m2 stops
United Airlines Logo
1:55 pm - 3:29 pmHEL-STL
32h 34m2 stops
$544United Airlines
Find Deal
Sun, Oct 19 - Tue, Oct 28
Air Canada Logo
9:15 am - 4:40 pmSTL-HEL
23h 25m2 stops
Air Canada Logo
1:55 pm - 3:29 pmHEL-STL
32h 34m2 stops
$550Air Canada
Find Deal
Sun, Oct 19 - Tue, Oct 28
British Airways Logo
5:25 pm - 6:25 pmSTL-HEL
17h 00m2 stops
British Airways Logo
11:55 am - 6:22 pmHEL-STL
14h 27m1 stop
$800British Airways
Find Deal
Sat, Sep 20 - Sat, Sep 27
Lufthansa Logo
5:30 pm - 6:55 pmSTL-HEL
17h 25m2 stops
Lufthansa Logo
6:00 am - 3:44 pmHEL-STL
17h 44m2 stops
$903Lufthansa
Find Deal
Sun, Sep 14 - Sun, Sep 21
Lufthansa Logo
5:30 pm - 12:25 amSTL-HEL
22h 55m2 stops
Lufthansa Logo
6:10 am - 3:44 pmHEL-STL
17h 34m2 stops
$953Lufthansa
Find Deal
Sat, Sep 20 - Sat, Sep 27
Lufthansa Logo
3:30 pm - 4:40 pmSTL-HEL
17h 10m1 stop
Lufthansa Logo
6:00 am - 3:44 pmHEL-STL
17h 44m2 stops
$1,004Lufthansa
Find Deal
Sun, Sep 14 - Sun, Sep 21
Scandinavian Airlines Logo
3:55 pm - 4:20 pmSTL-HEL
16h 25m3 stops
Scandinavian Airlines Logo
6:35 am - 10:00 pmHEL-STL
23h 25m2 stops
$1,023Scandinavian Airlines
Find Deal
Sat, Sep 20 - Sat, Sep 27
American Airlines Logo
5:18 am - 11:05 amSTL-HEL
21h 47m1 stop
American Airlines Logo
11:55 am - 8:15 pmHEL-STL
16h 20m1 stop
$1,098American Airlines
Find Deal
Sat, Sep 20 - Sat, Sep 27

United Airlines flights from St. Louis to Helsinki

Our best United Airlines deals on St. Louis to Helsinki flight tickets
United Airlines
Oct 19
STL3:30 pmLambert-St Louis
17h 10m
1 stop
HEL4:40 pmHelsinki-Vantaa
Oct 28
HEL7:05 amHelsinki-Vantaa
39h 24m
2 stops
STL3:29 pmLambert-St Louis
$543
Find similar
United Airlines
Oct 19
STL5:00 amLambert-St Louis
22h 55m
2 stops
HEL11:55 amHelsinki-Vantaa
Oct 28
HEL1:55 pmHelsinki-Vantaa
32h 34m
2 stops
STL3:29 pmLambert-St Louis
$544
Find similar

Lufthansa flights from St. Louis to Helsinki

Our best Lufthansa deals on St. Louis to Helsinki flight tickets
Lufthansa
Aug 6
STL1:04 pmLambert-St Louis
26h 46m
2 stops
HEL11:50 pmHelsinki-Vantaa
Aug 15
HEL12:40 pmHelsinki-Vantaa
18h 05m
2 stops
STL10:45 pmLambert-St Louis
$895
Find similar
Lufthansa
Sep 14
STL5:30 pmLambert-St Louis
17h 25m
2 stops
HEL6:55 pmHelsinki-Vantaa
Sep 21
HEL6:00 amHelsinki-Vantaa
17h 44m
2 stops
STL3:44 pmLambert-St Louis
$903
Find similar
Lufthansa
Sep 20
STL5:30 pmLambert-St Louis
22h 55m
2 stops
HEL12:25 amHelsinki-Vantaa
Sep 27
HEL6:10 amHelsinki-Vantaa
17h 34m
2 stops
STL3:44 pmLambert-St Louis
$953
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 July 31, 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

7:01 am-10:45 am

1 stop19h 44m

Helsinki-Vantaa

Tue 10/28

12:30 pm-8:53 pm

1 stop15h 23m

$482

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 10/19

3:30 pm-4:40 pm

1 stop17h 10m

Helsinki-Vantaa

Tue 10/28

7:05 am-3:29 pm

2 stops39h 24m

$543

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 10/19

5:00 am-11:55 am

2 stops22h 55m

Helsinki-Vantaa

Tue 10/28

1:55 pm-3:29 pm

2 stops32h 34m

$544

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 10/19

9:15 am-4:40 pm

2 stops23h 25m

Helsinki-Vantaa

Tue 10/28

1:55 pm-3:29 pm

2 stops32h 34m

$550

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sat 9/20

5:25 pm-6:25 pm

2 stops17h 00m

Helsinki-Vantaa

Sat 9/27

11:55 am-6:22 pm

1 stop14h 27m

$800

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 9/14

5:30 pm-6:55 pm

2 stops17h 25m

Helsinki-Vantaa

Sun 9/21

6:00 am-3:44 pm

2 stops17h 44m

$903

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sat 9/20

5:30 pm-12:25 am

2 stops22h 55m

Helsinki-Vantaa

Sat 9/27

6:10 am-3:44 pm

2 stops17h 34m

$953

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 9/14

3:30 pm-4:40 pm

1 stop17h 10m

Helsinki-Vantaa

Sun 9/21

6:00 am-3:44 pm

2 stops17h 44m

$1,004

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sat 9/20

3:55 pm-4:20 pm

3 stops16h 25m

Helsinki-Vantaa

Sat 9/27

6:35 am-10:00 pm

2 stops23h 25m

$1,023

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sat 9/20

5:18 am-11:05 am

1 stop21h 47m

Helsinki-Vantaa

Sat 9/27

11:55 am-8:15 pm

1 stop16h 20m

$1,098

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 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 cheapest month to fly to Helsinki?

The month of October is, on average, the cheapest month to fly to Helsinki from St. Louis, with most prices found around $495. If you aren’t able to travel during the month of October, then book flights to Helsinki from St. Louis during November instead. Flights to Helsinki in November, while not as cheap as those in October, still average around $507.

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 3% 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

Best Price Found

$419

Fastest flight time

13h 20m

Direct flights

None

Airports in Helsinki

1 airport
The best one-way flight to Helsinki from St. Louis in the past 72 hours is $419. The best round-trip flight deal from St. Louis to Helsinki found on momondo in the last 72 hours is $482.
The fastest flight from St. Louis to Helsinki takes 13h 20m
There are no direct flights from St. Louis to Helsinki. Popular non-direct route for this connection is Lambert-St Louis Airport - Helsinki-Vantaa Airport.
There is 1 airport near Helsinki: Helsinki-Vantaa (HEL)
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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
British AirwaysPriceFrom $495Free CancellationRating
6.6
7,222 reviews
Search British Airways flights
FinnairPriceFrom $506Free CancellationRating
7.6
1,316 reviews
Search Finnair flights
LufthansaPriceFrom $533Free CancellationRating
6.8
7,275 reviews
Search Lufthansa flights
United AirlinesPriceFrom $576Free CancellationRating
7.4
8,900 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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