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Cheap flights from St. Louis to Helsinki from $444

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 11/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from St. Louis to Helsinki

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
5:18 pm - 7:00 pmSTL-HEL
17h 42m2 stops
Lufthansa Logo
7:05 am - 1:30 pmHEL-STL
14h 25m1 stop
$527Lufthansa
Find Deal
Fri, Apr 3 - Fri, Apr 10
American Airlines Logo
5:28 am - 10:45 amSTL-HEL
22h 17m1 stop
American Airlines Logo
12:35 pm - 10:24 pmHEL-STL
17h 49m1 stop
$532American Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
Lufthansa Logo
3:30 pm - 5:10 pmSTL-HEL
17h 40m1 stop
Lufthansa Logo
7:05 am - 1:30 pmHEL-STL
14h 25m1 stop
$534Lufthansa
Find Deal
Fri, Apr 3 - Fri, Apr 10
American Airlines Logo
2:36 pm - 1:55 pmSTL-HEL
16h 19m2 stops
American Airlines Logo
12:35 pm - 9:48 pmHEL-STL
17h 13m2 stops
$536American Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
Multiple Airlines Logo
5:18 pm - 7:00 pmSTL-HEL
17h 42m2 stops
Multiple Airlines Logo
6:00 am - 3:24 pmHEL-STL
41h 24m2 stops
$544Multiple Airlines
Find Deal
Fri, Apr 3 - Fri, Apr 10
Lufthansa Logo
4:50 pm - 1:05 pmSTL-HEL
13h 15m1 stop
Lufthansa Logo
7:05 am - 7:48 pmHEL-STL
20h 43m2 stops
$553Lufthansa
Find Deal
Fri, Mar 27 - Tue, Mar 31
United Airlines Logo
4:50 pm - 6:50 pmSTL-HEL
19h 00m2 stops
United Airlines Logo
7:05 am - 7:25 pmHEL-STL
20h 20m2 stops
$713United Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
Multiple Airlines Logo
10:30 am - 1:05 pmSTL-HEL
18h 35m3 stops
Multiple Airlines Logo
6:00 am - 3:24 pmHEL-STL
41h 24m2 stops
$800Multiple Airlines
Find Deal
Fri, Apr 3 - Fri, Apr 10
Scandinavian Airlines Logo
11:51 am - 3:25 pmSTL-HEL
20h 34m2 stops
Scandinavian Airlines Logo
7:15 am - 11:40 pmHEL-STL
24h 25m3 stops
$1,069Scandinavian Airlines
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Fri, Mar 27 - Tue, Mar 31
Delta Logo
2:38 pm - 4:25 pmSTL-HEL
17h 47m2 stops
Delta Logo
6:30 am - 11:38 pmHEL-STL
25h 08m2 stops
$1,231Delta
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Thu, Dec 18 - Thu, Dec 25

American Airlines flights from St. Louis to Helsinki

Our best American Airlines deals on St. Louis to Helsinki flight tickets
American Airlines
Mar 27
STL5:28 amLambert-St Louis
22h 17m
1 stop
HEL10:45 amHelsinki-Vantaa
Mar 31
HEL12:35 pmHelsinki-Vantaa
17h 49m
1 stop
STL10:24 pmLambert-St Louis
$532
Find similar
American Airlines
Mar 27
STL2:36 pmLambert-St Louis
16h 19m
2 stops
HEL1:55 pmHelsinki-Vantaa
Mar 31
HEL12:35 pmHelsinki-Vantaa
17h 13m
2 stops
STL9:48 pmLambert-St Louis
$536
Find similar
American Airlines
Dec 18
STL7:00 amLambert-St Louis
19h 45m
1 stop
HEL10:45 amHelsinki-Vantaa
Dec 25
HEL12:30 pmHelsinki-Vantaa
14h 52m
1 stop
STL7:22 pmLambert-St Louis
$1,710
Find similar

Lufthansa flights from St. Louis to Helsinki

Our best Lufthansa deals on St. Louis to Helsinki flight tickets
Lufthansa
Apr 3
STL5:18 pmLambert-St Louis
17h 42m
2 stops
HEL7:00 pmHelsinki-Vantaa
Apr 10
HEL7:05 amHelsinki-Vantaa
14h 25m
1 stop
STL1:30 pmLambert-St Louis
$527
Find similar
Lufthansa
Apr 3
STL3:30 pmLambert-St Louis
17h 40m
1 stop
HEL5:10 pmHelsinki-Vantaa
Apr 10
HEL7:05 amHelsinki-Vantaa
14h 25m
1 stop
STL1:30 pmLambert-St Louis
$534
Find similar
Lufthansa
Mar 27
STL4:50 pmLambert-St Louis
13h 15m
1 stop
HEL1:05 pmHelsinki-Vantaa
Mar 31
HEL7:05 amHelsinki-Vantaa
20h 43m
2 stops
STL7:48 pmLambert-St Louis
$553
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 November 4, 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

Fri 4/3

5:18 pm-7:00 pm

2 stops17h 42m

Helsinki-Vantaa

Fri 4/10

7:05 am-1:30 pm

1 stop14h 25m

$527

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 3/27

5:28 am-10:45 am

1 stop22h 17m

Helsinki-Vantaa

Tue 3/31

12:35 pm-10:24 pm

1 stop17h 49m

$532

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 4/3

3:30 pm-5:10 pm

1 stop17h 40m

Helsinki-Vantaa

Fri 4/10

7:05 am-1:30 pm

1 stop14h 25m

$534

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 3/27

2:36 pm-1:55 pm

2 stops16h 19m

Helsinki-Vantaa

Tue 3/31

12:35 pm-9:48 pm

2 stops17h 13m

$536

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 4/3

5:18 pm-7:00 pm

2 stops17h 42m

Helsinki-Vantaa

Fri 4/10

6:00 am-3:24 pm

2 stops41h 24m

$544

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 3/27

4:50 pm-1:05 pm

1 stop13h 15m

Helsinki-Vantaa

Tue 3/31

7:05 am-7:48 pm

2 stops20h 43m

$553

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 3/27

4:50 pm-6:50 pm

2 stops19h 00m

Helsinki-Vantaa

Tue 3/31

7:05 am-7:25 pm

2 stops20h 20m

$713

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 4/3

10:30 am-1:05 pm

3 stops18h 35m

Helsinki-Vantaa

Fri 4/10

6:00 am-3:24 pm

2 stops41h 24m

$800

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 3/27

11:51 am-3:25 pm

2 stops20h 34m

Helsinki-Vantaa

Tue 3/31

7:15 am-11:40 pm

3 stops24h 25m

$1,069

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Thu 12/18

2:38 pm-4:25 pm

2 stops17h 47m

Helsinki-Vantaa

Thu 12/25

6:30 am-11:38 pm

2 stops25h 08m

$1,231

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 cheapest month to fly to Helsinki?

The month of November is, on average, the cheapest month to fly to Helsinki from St. Louis, with most prices found around $507. If you aren’t able to travel during the month of November, then book flights to Helsinki from St. Louis during April instead. Flights to Helsinki in April, while not as cheap as those in November, still average around $668.

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.
Search flight deals

  • 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 15m 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 $490Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights

Traveling to a place near Helsinki?

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

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?

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