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$686+ Cheap flights from St. Louis (STL) to Helsinki (HEL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HEL
Jun 28 — Jul 51
Sun 6/28
Sun 7/5
1 adult, Economy
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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 May 29, 2026.

This Iberia deal was found by Cheapflights users on 5/26. 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.
Mon 9/149:58 am
STL
-
HEL
1 stop20h 02m
Multiple Airlines
Fri 9/184:25 pm
HEL
-
STL
1 stop12h 19m
Multiple Airlines
Deal found 5/26$780
This FlightHub deal was found by Cheapflights users on 5/26. 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 9/1412:59 pm
STL
-
HEL
2 stops15h 06m
Lufthansa
Fri 9/186:55 am
HEL
-
STL
2 stops22h 41m
Lufthansa
Deal found 5/26$783
This American Airlines deal was found by Cheapflights users on 5/26. 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 9/1411:01 am
STL
-
HEL
2 stops18h 59m
American Airlines
Fri 9/184:25 pm
HEL
-
STL
1 stop16h 02m
American Airlines
Deal found 5/26$784
This Justfly.com deal was found by Cheapflights users on 5/28. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/231:13 pm
STL
-
HEL
2 stops14h 52m
Lufthansa
Thu 8/66:35 am
HEL
-
STL
2 stops24h 54m
Lufthansa
Deal found 5/28$998
This Delta deal was found by Cheapflights users on 5/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/236:58 pm
STL
-
HEL
2 stops14h 42m
Delta
Thu 8/61:55 pm
HEL
-
STL
2 stops18h 03m
Delta
Deal found 5/27$1,011
This KAYAK deal was found by Cheapflights users on 5/25. 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 7/13:30 pm
STL
-
HEL
2 stops19h 25m
Lufthansa
Wed 7/156:35 am
HEL
-
STL
1 stop14h 50m
Lufthansa
Deal found 5/25$1,013
This United Airlines deal was found by Cheapflights users on 5/26. 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.
Fri 7/1010:20 am
STL
-
HEL
2 stops30h 20m
United Airlines
Fri 7/176:55 am
HEL
-
STL
2 stops20h 28m
United Airlines
Deal found 5/26$1,023
This American Airlines deal was found by Cheapflights users on 5/26. 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.
Thu 7/235:48 pm
STL
-
HEL
2 stops13h 12m
American Airlines
Thu 8/612:30 pm
HEL
-
STL
2 stops19h 04m
American Airlines
Deal found 5/26$1,034

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 May 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$780
(Iberia)

One-way from

$686
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$675
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
One-way flight from Lambert-St Louis to Helsinki-Vantaa
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($183 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 29, 2026.
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

Cheapest round-trip

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 7/10

10:20 am-12:40 am

2 stops30h 20m

Helsinki-Vantaa

Fri 7/17

6:55 am-7:23 pm

2 stops20h 28m

$1,023

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 7/1

3:30 pm-1:35 am

2 stops26h 05m

Helsinki-Vantaa

Wed 7/15

6:35 am-1:25 pm

1 stop14h 50m

$1,040

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Mon 9/14

2:30 pm-8:35 pm

3 stops22h 05m

Helsinki-Vantaa

Fri 9/18

7:15 am-11:36 pm

3 stops24h 21m

$1,114

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 7/1

6:00 am-6:55 pm

2 stops28h 55m

Helsinki-Vantaa

Wed 7/15

6:35 am-1:25 pm

1 stop14h 50m

$1,133

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 7/10

3:30 pm-12:40 am

1 stop25h 10m

Helsinki-Vantaa

Fri 7/17

6:55 am-1:25 pm

1 stop14h 30m

$1,209
Quickest round-trip

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Thu 7/23

9:44 am-10:45 am

1 stop17h 01m

Helsinki-Vantaa

Thu 8/6

4:25 pm-12:14 am

1 stop15h 49m

$1,238

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 6/10

1:59 pm-4:40 pm

2 stops18h 41m

Helsinki-Vantaa

Wed 6/17

7:00 am-8:39 pm

2 stops21h 39m

$1,301

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 6/10

12:55 pm-5:10 pm

2 stops20h 15m

Helsinki-Vantaa

Wed 6/17

6:35 am-1:25 pm

1 stop14h 50m

$1,305

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 7/1

8:55 am-1:05 pm

2 stops20h 10m

Helsinki-Vantaa

Wed 7/15

6:35 am-8:22 pm

3 stops21h 47m

$1,631

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Thu 7/23

1:22 pm-1:30 am

2 stops28h 08m

Helsinki-Vantaa

Thu 8/6

9:40 am-11:58 pm

3 stops22h 18m

$1,711

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/27

Showing 1-10 of 11 resultsSorted by cheapest first
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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 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 May 29, 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
7.1
Good
11,643 reviews

Comfort

7.2

Food

6.4

Overall

7.1

Boarding

7.5

Entertainment

6.9

Crew

7.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,Apr 2026

DFW - BDL

They keep changing the gate, delaying the hours and then finally canceled it. No accomodation, no food, nothing!
American Airlines
7.1
Good
11,643 reviews
American Airlines
7.1
Good
11,643 reviews

Comfort

7.2

Food

6.4

Overall

7.1

Boarding

7.5

Entertainment

6.9

Crew

7.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,Apr 2026

DFW - BDL

They keep changing the gate, delaying the hours and then finally canceled it. No accomodation, no food, nothing!

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 22h 05m. United Airlines provides one of the quickest options available for as low as $1,114. 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 $481, was found to be the cheapest airline from St. Louis to Helsinki.. This flight start at 40% 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

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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 May 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$481Average$727FlexibilityNo cancel feeOn-time71%

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