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Cheap flights from St. Louis to Finland 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 Finland departing on 1/25. 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 Finland

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
6:40 pm - 6:50 pm
STL
-
HEL
16h 10m2 stops
Lufthansa Logo
6:55 am - 10:58 pm
HEL
-
STL
24h 03m2 stops
$497Lufthansa
Sun, Jan 25 - Sun, Feb 1
United Airlines Logo
8:05 am - 6:50 pm
STL
-
HEL
26h 45m2 stops
United Airlines Logo
6:55 am - 9:13 pm
HEL
-
STL
22h 18m2 stops
$498United Airlines
Wed, Jan 28 - Sun, Feb 1
United Airlines Logo
8:05 am - 6:50 pm
STL
-
HEL
26h 45m2 stops
United Airlines Logo
12:45 pm - 10:58 pm
HEL
-
STL
18h 13m2 stops
$499United Airlines
Wed, Jan 28 - Sun, Feb 1
British Airways Logo
3:54 pm - 12:20 pm
STL
-
HEL
36h 26m2 stops
British Airways Logo
12:30 pm - 7:29 pm
HEL
-
STL
14h 59m1 stop
$504British Airways
Sun, Jan 25 - Sun, Feb 1
Multiple Airlines Logo
5:14 am - 10:45 am
STL
-
HEL
21h 31m1 stop
Multiple Airlines Logo
8:30 pm - 9:51 pm
HEL
-
STL
32h 21m2 stops
$513Multiple Airlines
Thu, Mar 5 - Sun, Mar 15
Finnair Logo
11:55 am - 10:45 am
STL
-
HEL
14h 50m1 stop
Finnair Logo
12:30 pm - 7:29 pm
HEL
-
STL
14h 59m1 stop
$687Finnair
Sun, Jan 25 - Sun, Feb 1
Lufthansa Logo
1:14 pm - 1:20 am
STL
-
HEL
28h 06m2 stops
Lufthansa Logo
5:45 pm - 11:51 pm
HEL
-
STL
37h 06m2 stops
$695Lufthansa
Thu, Mar 5 - Sun, Mar 15
Finnair Logo
11:46 am - 10:45 am
STL
-
HEL
14h 59m1 stop
Finnair Logo
12:30 pm - 7:29 pm
HEL
-
STL
13h 59m1 stop
$716Finnair
Thu, Mar 5 - Sun, Mar 15
British Airways Logo
2:54 pm - 3:15 pm
STL
-
HEL
16h 21m2 stops
British Airways Logo
12:30 pm - 7:29 pm
HEL
-
STL
14h 59m1 stop
$903British Airways
Wed, Jan 28 - Sun, Feb 1
Multiple Airlines Logo
4:05 pm - 1:20 am
STL
-
HEL
25h 15m2 stops
Multiple Airlines Logo
12:45 pm - 3:29 pm
HEL
-
STL
33h 44m3 stops
$997Multiple Airlines
Thu, Mar 5 - Sun, Mar 15

United Airlines flights from St. Louis to Finland

Our best United Airlines deals on St. Louis to Finland flight tickets
United Airlines
Jan 28
STL8:05 amLambert-St Louis
26h 45m
2 stops
HEL6:50 pmHelsinki-Vantaa
Feb 1
HEL6:55 amHelsinki-Vantaa
22h 18m
2 stops
STL9:13 pmLambert-St Louis
$498
Find similar
United Airlines
Jan 28
STL8:05 amLambert-St Louis
26h 45m
2 stops
HEL6:50 pmHelsinki-Vantaa
Feb 1
HEL12:45 pmHelsinki-Vantaa
18h 13m
2 stops
STL10:58 pmLambert-St Louis
$499
Find similar
United Airlines
May 18
STL7:45 amLambert-St Louis
20h 20m
2 stops
HEL12:05 pmHelsinki-Vantaa
May 27
HEL7:05 amHelsinki-Vantaa
14h 25m
1 stop
STL1:30 pmLambert-St Louis
$1,036
Find similar

British Airways flights from St. Louis to Finland

Our best British Airways deals on St. Louis to Finland flight tickets
British Airways
Jan 25
STL3:54 pmLambert-St Louis
36h 26m
2 stops
HEL12:20 pmHelsinki-Vantaa
Feb 1
HEL12:30 pmHelsinki-Vantaa
14h 59m
1 stop
STL7:29 pmLambert-St Louis
$504
Find similar
British Airways
Jan 28
STL2:54 pmLambert-St Louis
16h 21m
2 stops
HEL3:15 pmHelsinki-Vantaa
Feb 1
HEL12:30 pmHelsinki-Vantaa
14h 59m
1 stop
STL7:29 pmLambert-St Louis
$903
Find similar
British Airways
Jan 28
STL11:05 amLambert-St Louis
20h 10m
2 stops
HEL3:15 pmHelsinki-Vantaa
Feb 1
HEL12:30 pmHelsinki-Vantaa
14h 59m
1 stop
STL7:29 pmLambert-St Louis
$1,025
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Finland 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 11, 2025.
Use the filters below to find and compare flights from St. Louis to Finland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 1/25

6:40 pm-6:50 pm

2 stops16h 10m

Helsinki-Vantaa

Sun 2/1

6:55 am-10:58 pm

2 stops24h 03m

$497

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 1/28

8:05 am-6:50 pm

2 stops26h 45m

Helsinki-Vantaa

Sun 2/1

6:55 am-9:13 pm

2 stops22h 18m

$498

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 1/28

8:05 am-6:50 pm

2 stops26h 45m

Helsinki-Vantaa

Sun 2/1

12:45 pm-10:58 pm

2 stops18h 13m

$499

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 1/25

3:54 pm-12:20 pm

2 stops36h 26m

Helsinki-Vantaa

Sun 2/1

12:30 pm-7:29 pm

1 stop14h 59m

$504

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Thu 3/5

5:14 am-10:45 am

1 stop21h 31m

Helsinki-Vantaa

Sun 3/15

8:30 pm-9:51 pm

2 stops32h 21m

$513

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 1/25

11:55 am-10:45 am

1 stop14h 50m

Helsinki-Vantaa

Sun 2/1

12:30 pm-7:29 pm

1 stop14h 59m

$687

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Thu 3/5

1:14 pm-1:20 am

2 stops28h 06m

Helsinki-Vantaa

Sun 3/15

5:45 pm-11:51 pm

2 stops37h 06m

$695

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Thu 3/5

11:46 am-10:45 am

1 stop14h 59m

Helsinki-Vantaa

Sun 3/15

12:30 pm-7:29 pm

1 stop13h 59m

$716

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 1/28

2:54 pm-3:15 pm

2 stops16h 21m

Helsinki-Vantaa

Sun 2/1

12:30 pm-7:29 pm

1 stop14h 59m

$903

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Thu 3/5

4:05 pm-1:20 am

2 stops25h 15m

Helsinki-Vantaa

Sun 3/15

12:45 pm-3:29 pm

3 stops33h 44m

$997

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Finland from

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

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 Finland?

The cheapest day to depart from St. Louis to Finland is on a Tuesday. Travelers who choose to depart for Finland on a Tuesday will often find tickets for as low as $511. Be sure to avoid booking your departure on a Wednesday as prices are generally higher than usual. According to our data, the average ticket price to Finland on Wednesday is $1,482.

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

The cheapest time of day to fly to Finland is in the morning when flights can be purchased for as low as $706. In contrast, the most expensive time of day to depart to Finland is at noon when prices are around $1,476.

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

You could potentially save up to 2% on your flight if you consider stops on a St. Louis to Finland flight.

Cheap St. Louis to Finland flight deals and tips

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

Fastest flight time

17h 42m

Direct flights

None
The fastest flight from St. Louis to Finland takes 17h 42m
There are no direct flights from St. Louis to Finland. There are no popular flight routes from St. Louis to Finland.
Search flight deals

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

    Prices for flights from Lambert-St Louis Airport to Finland are refreshed on a daily basis.

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

  • How old do you have to be to fly from Lambert-St Louis Airport to Finland?

    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 Finland.

  • What documentation or ID do you need to fly to Finland?

    The travel and health documents you'll need for your trip to Finland may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Finland. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from St. Louis to Finland

Compare and see reviews for airlines that fly from St. Louis to Finland with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $490Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Finland from St. Louis.

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

Yes. momondo allows you to filter the results for St. Louis to Finland flights to just show those with flexible booking policies.

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

momondo helps you find the best flight between St. Louis and Finland by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are not ready to book a flight from St. Louis to Finland now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Finland and let you know when they change.

An easier way to manage your Finland trip

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