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Cheap flights from St. Louis to Helsinki from $497

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Helsinki departing on 2/2. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
9:59 am - 4:25 pm
STL
-
HEL
22h 26m2 stops
Delta Logo
7:00 am - 8:43 pm
HEL
-
STL
21h 43m2 stops
$497Delta
Mon, Feb 2 - Mon, Feb 9
United Airlines Logo
3:50 pm - 1:05 pm
STL
-
HEL
13h 15m1 stop
United Airlines Logo
7:05 am - 3:15 pm
HEL
-
STL
40h 10m2 stops
$502United Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
3:50 pm - 1:05 pm
STL
-
HEL
13h 15m1 stop
United Airlines Logo
7:05 am - 2:30 pm
HEL
-
STL
39h 25m2 stops
$506United Airlines
Fri, Jan 30 - Tue, Feb 3
Multiple Airlines Logo
4:39 pm - 2:15 pm
STL
-
HEL
13h 36m1 stop
Multiple Airlines Logo
4:25 pm - 9:48 pm
HEL
-
STL
13h 23m1 stop
$556Multiple Airlines
Sun, Apr 19 - Sat, Apr 25
American Airlines Logo
9:45 am - 10:45 am
STL
-
HEL
17h 00m1 stop
American Airlines Logo
12:35 pm - 11:24 pm
HEL
-
STL
18h 49m2 stops
$564American Airlines
Sun, Apr 19 - Sat, Apr 25
United Airlines Logo
9:57 am - 6:50 pm
STL
-
HEL
24h 53m2 stops
United Airlines Logo
7:05 am - 2:30 pm
HEL
-
STL
39h 25m2 stops
$587United Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
6:30 am - 1:05 pm
STL
-
HEL
22h 35m2 stops
United Airlines Logo
7:05 am - 3:15 pm
HEL
-
STL
40h 10m2 stops
$596United Airlines
Fri, Jan 30 - Tue, Feb 3
British Airways Logo
2:54 pm - 11:00 pm
STL
-
HEL
24h 06m2 stops
British Airways Logo
12:30 pm - 10:59 pm
HEL
-
STL
18h 29m1 stop
$599British Airways
Mon, Feb 2 - Mon, Feb 9
American Airlines Logo
7:00 am - 10:45 am
STL
-
HEL
20h 45m1 stop
American Airlines Logo
4:25 pm - 11:52 pm
HEL
-
STL
15h 27m1 stop
$606American Airlines
Sat, Mar 21 - Sun, Mar 29
American Airlines Logo
9:34 am - 10:45 am
STL
-
HEL
17h 11m1 stop
American Airlines Logo
12:30 pm - 10:59 pm
HEL
-
STL
18h 29m1 stop
$610American Airlines
Mon, Feb 2 - Mon, Feb 9

United Airlines flights from St. Louis to Helsinki

Our best United Airlines deals on St. Louis to Helsinki flight tickets
United Airlines
Jan 30
STL3:50 pmLambert-St Louis
13h 15m
1 stop
HEL1:05 pmHelsinki-Vantaa
Feb 3
HEL7:05 amHelsinki-Vantaa
40h 10m
2 stops
STL3:15 pmLambert-St Louis
$502
Find similar
United Airlines
Jan 30
STL3:50 pmLambert-St Louis
13h 15m
1 stop
HEL1:05 pmHelsinki-Vantaa
Feb 3
HEL7:05 amHelsinki-Vantaa
39h 25m
2 stops
STL2:30 pmLambert-St Louis
$506
Find similar
United Airlines
Jan 30
STL9:57 amLambert-St Louis
24h 53m
2 stops
HEL6:50 pmHelsinki-Vantaa
Feb 3
HEL7:05 amHelsinki-Vantaa
39h 25m
2 stops
STL2:30 pmLambert-St Louis
$587
Find similar

American Airlines flights from St. Louis to Helsinki

Our best American Airlines deals on St. Louis to Helsinki flight tickets
American Airlines
Apr 19
STL9:45 amLambert-St Louis
17h 00m
1 stop
HEL10:45 amHelsinki-Vantaa
Apr 25
HEL12:35 pmHelsinki-Vantaa
18h 49m
2 stops
STL11:24 pmLambert-St Louis
$564
Find similar
American Airlines
Mar 21
STL7:00 amLambert-St Louis
20h 45m
1 stop
HEL10:45 amHelsinki-Vantaa
Mar 29
HEL4:25 pmHelsinki-Vantaa
15h 27m
1 stop
STL11:52 pmLambert-St Louis
$606
Find similar
American Airlines
Feb 2
STL9:34 amLambert-St Louis
17h 11m
1 stop
HEL10:45 amHelsinki-Vantaa
Feb 9
HEL12:30 pmHelsinki-Vantaa
18h 29m
1 stop
STL10:59 pmLambert-St Louis
$610
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 December 21, 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

Mon 2/2

9:59 am-4:25 pm

2 stops22h 26m

Helsinki-Vantaa

Mon 2/9

7:00 am-8:43 pm

2 stops21h 43m

$497

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 1/30

3:50 pm-1:05 pm

1 stop13h 15m

Helsinki-Vantaa

Tue 2/3

7:05 am-3:15 pm

2 stops40h 10m

$502

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 1/30

3:50 pm-1:05 pm

1 stop13h 15m

Helsinki-Vantaa

Tue 2/3

7:05 am-2:30 pm

2 stops39h 25m

$506

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 4/19

4:39 pm-2:15 pm

1 stop13h 36m

Helsinki-Vantaa

Sat 4/25

4:25 pm-9:48 pm

1 stop13h 23m

$556

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 4/19

9:45 am-10:45 am

1 stop17h 00m

Helsinki-Vantaa

Sat 4/25

12:35 pm-11:24 pm

2 stops18h 49m

$564

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 1/30

9:57 am-6:50 pm

2 stops24h 53m

Helsinki-Vantaa

Tue 2/3

7:05 am-2:30 pm

2 stops39h 25m

$587

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 1/30

6:30 am-1:05 pm

2 stops22h 35m

Helsinki-Vantaa

Tue 2/3

7:05 am-3:15 pm

2 stops40h 10m

$596

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Mon 2/2

2:54 pm-11:00 pm

2 stops24h 06m

Helsinki-Vantaa

Mon 2/9

12:30 pm-10:59 pm

1 stop18h 29m

$599

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sat 3/21

7:00 am-10:45 am

1 stop20h 45m

Helsinki-Vantaa

Sun 3/29

4:25 pm-11:52 pm

1 stop15h 27m

$606

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Mon 2/2

9:34 am-10:45 am

1 stop17h 11m

Helsinki-Vantaa

Mon 2/9

12:30 pm-10:59 pm

1 stop18h 29m

$610

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 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 28% 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

13h 15m

Direct flights

None
The fastest flight from St. Louis to Helsinki takes 13h 15m
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
11,050 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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