HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Helsinki

$484+ Cheap flights from St. Louis (STL) to Helsinki (HEL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HEL
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Helsinki with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from St. Louis to Helsinki

Cheapest flights from St. Louis to Helsinki
Explore the most affordable flight options available from St. Louis to Helsinki. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.

This Finnair deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/911:22 am
STL
-
HEL
1 stop16h 48m
Finnair
Mon 3/1612:45 pm
HEL
-
STL
1 stop18h 13m
Finnair
Deal found 2/9$484
This FlightHub deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/97:00 pm
STL
-
HEL
2 stops16h 50m
Lufthansa
Mon 3/166:55 am
HEL
-
STL
2 stops42h 05m
Lufthansa
Deal found 2/9$487
This American Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/911:46 am
STL
-
HEL
1 stop15h 59m
American Airlines
Mon 3/1612:30 pm
HEL
-
STL
2 stops18h 14m
American Airlines
Deal found 2/9$489
This American Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2511:22 am
STL
-
HEL
1 stop16h 48m
American Airlines
Wed 4/14:25 pm
HEL
-
STL
1 stop12h 46m
American Airlines
Deal found 2/8$514
This American Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/46:33 pm
STL
-
HEL
1 stop11h 42m
American Airlines
Wed 4/154:25 pm
HEL
-
STL
1 stop15h 21m
American Airlines
Deal found 2/8$534
This KAYAK deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/13:30 pm
STL
-
HEL
2 stops19h 25m
Lufthansa
Wed 4/86:35 am
HEL
-
STL
2 stops22h 33m
Lufthansa
Deal found 2/10$537
This KLM deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/45:29 pm
STL
-
HEL
2 stops16h 11m
KLM
Wed 4/157:00 am
HEL
-
STL
2 stops15h 29m
KLM
Deal found 2/8$552
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/117:45 am
STL
-
HEL
2 stops25h 15m
United Airlines
Tue 4/212:05 pm
HEL
-
STL
2 stops33h 19m
United Airlines
Deal found 2/10$560
This Iberia deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/252:00 pm
STL
-
HEL
2 stops25h 25m
Iberia
Wed 4/14:25 pm
HEL
-
STL
1 stop15h 19m
Iberia
Deal found 2/8$593
This KLM deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/255:21 pm
STL
-
HEL
2 stops16h 04m
Multiple Airlines
Wed 4/17:00 am
HEL
-
STL
2 stops17h 32m
Multiple Airlines
Deal found 2/8$601

Find flight deals from St. Louis to Helsinki

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Helsinki (HEL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$484
(Finnair)

Popular in

May

Cheapest in

February

Average price

$554
Provider with most accurate pricing for Lambert-St Louis-Helsinki-Vantaa flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Helsinki-Vantaa flights.
Search Deals
From Lambert-St Louis to Helsinki-Vantaa
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($215 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($61 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated February 11, 2026.
Use the filters below to find and compare flights from St. Louis to Helsinki that are best for you.

Fly from

St. Louis

Fly to

Helsinki

Route

Depart

Return

Price

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Mon 3/9

11:22 am-11:10 am

1 stop16h 48m

Helsinki-Vantaa

Mon 3/16

12:45 pm-11:58 pm

1 stop18h 13m

$484

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 4/1

2:29 pm-2:15 pm

1 stop15h 46m

Helsinki-Vantaa

Wed 4/8

4:25 pm-11:46 pm

1 stop15h 21m

$484

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Mon 3/9

7:00 pm-6:50 pm

2 stops16h 50m

Helsinki-Vantaa

Mon 3/16

6:55 am-6:00 pm

2 stops42h 05m

$487

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Mon 3/9

11:46 am-10:45 am

1 stop15h 59m

Helsinki-Vantaa

Mon 3/16

12:30 pm-11:44 pm

2 stops18h 14m

$489

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 3/25

11:22 am-11:10 am

1 stop16h 48m

Helsinki-Vantaa

Wed 4/1

4:25 pm-9:11 pm

1 stop12h 46m

$514

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sat 4/11

8:54 am-2:15 pm

1 stop21h 21m

Helsinki-Vantaa

Tue 4/21

12:35 pm-7:30 pm

1 stop14h 55m

$534

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 4/1

3:30 pm-6:55 pm

2 stops19h 25m

Helsinki-Vantaa

Wed 4/8

6:35 am-9:08 pm

2 stops22h 33m

$537

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sat 4/4

5:29 pm-5:40 pm

2 stops16h 11m

Helsinki-Vantaa

Wed 4/15

7:00 am-2:29 pm

2 stops15h 29m

$552

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sat 4/11

7:45 am-5:00 pm

2 stops25h 15m

Helsinki-Vantaa

Tue 4/21

2:05 pm-3:24 pm

2 stops33h 19m

$560

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 3/25

2:00 pm-10:25 pm

2 stops25h 25m

Helsinki-Vantaa

Wed 4/1

4:25 pm-11:44 pm

1 stop15h 19m

$593

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/9

Showing 1-10 of 11 results
1
2

Compare providers for flights from St. Louis to Helsinki

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Helsinki in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Helsinki flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Helsinki flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Helsinki flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Helsinki flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Helsinki flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Helsinki

Have a flexible travel schedule? Discover the best time to fly to Helsinki from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Helsinki

How much does it cost to fly round-trip from St. Louis to Helsinki?

Reviews of airlines servicing Helsinki

Get insights into the airlines that provide service to Helsinki. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Helsinki. Reviews last updated February 11, 2026.
Read through reviews of airlines operating flights from St. Louis to Helsinki, such as American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,262 reviews

Comfort

7.2

Crew

8.0

Food

6.4

Overall

7.2

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Susie,Jan 2026

CLT - TPA

This flight was delayed 3 or 4 times. We had boarded the plane, sat on plane for a good 30 minutes, then we had to board the aircraft, walk to a different gate, wait and then board another aircraft. We arrived in Tampa 4 hours later than the original booking. I feel there should have been some sort of compensation especially for the advantage members.
American Airlines
7.2
Good
11,262 reviews
American Airlines
7.2
Good
11,262 reviews

Comfort

7.2

Crew

8.0

Food

6.4

Overall

7.2

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Susie,Jan 2026

CLT - TPA

This flight was delayed 3 or 4 times. We had boarded the plane, sat on plane for a good 30 minutes, then we had to board the aircraft, walk to a different gate, wait and then board another aircraft. We arrived in Tampa 4 hours later than the original booking. I feel there should have been some sort of compensation especially for the advantage members.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Helsinki. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from St. Louis to Helsinki?

    A quick flight from St. Louis to Helsinki can take about 15h 59m. Finnair provides one of the quickest options available for as low as $489. The distance from St. Louis to Helsinki is about 4678 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from St. Louis to Helsinki round-trip?

    American Airlines, at $484, was found to be the cheapest airline from St. Louis to Helsinki.. This flight start at 44% lower than the current average price 3 months from now.

  • Can I find deals for flights from St. Louis to Helsinki that include hotel bookings?

    Yes. In addition to deals on St. Louis to Helsinki flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Helsinki?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Helsinki.

  • Can I find deals for business class flights from St. Louis to Helsinki?

    Yes. Cheapflights offers flight deals from St. Louis to Helsinki by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Helsinki?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Helsinki

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Helsinki flights

Top airline flying from St. Louis to Helsinki

Discover the top airline that operate flights from St. Louis to Helsinki. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$484Average$668FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.