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$527+ 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 11/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HEL
Oct 30 — Nov 61
Thu 10/30
Thu 11/6
1 adult, Economy
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Cheap 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 September 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$550
(United Airlines)

Popular in

June

Cheapest in

November

Average price

$1,067
Provider with most accurate pricing for Lambert-St Louis-Helsinki-Vantaa flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Helsinki-Vantaa flights.
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From Lambert-St Louis to Helsinki-Vantaa
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Highest demand for flights based on searches. 21% potential increase in price ($245 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 30, 2025.

This United Airlines deal was found by Cheapflights users on 9/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1111:05 amSTL - HEL
2 stops18h 05mUnited Airlines
Mon 11/241:55 pmHEL - STL
2 stops33h 51mUnited Airlines
Deal found 9/27$527
This American Airlines deal was found by Cheapflights users on 9/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1910:10 amSTL - HEL
1 stop16h 35mAmerican Airlines
Tue 10/2812:30 pmHEL - STL
1 stop17h 48mAmerican Airlines
Deal found 9/28$569
This United Airlines deal was found by Cheapflights users on 9/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1912:25 pmSTL - HEL
2 stops28h 15mUnited Airlines
Tue 10/281:55 pmHEL - STL
2 stops27h 12mUnited Airlines
Deal found 9/28$637
This Cheapflightsfares deal was found by Cheapflights users on 9/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/193:30 pmSTL - HEL
1 stop13h 20mLufthansa
Tue 10/287:35 pmHEL - STL
2 stops26h 20mLufthansa
Deal found 9/30$728
This Mytrip deal was found by Cheapflights users on 9/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/185:28 pmSTL - HEL
2 stops35h 22mMultiple Airlines
Sun 10/261:50 pmHEL - STL
2 stops56h 39mMultiple Airlines
Deal found 9/28$1,041

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 September 30, 2025.
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

Tue 11/11

11:05 am-1:10 pm

2 stops18h 05m

Helsinki-Vantaa

Mon 11/24

1:55 pm-3:46 pm

2 stops33h 51m

$527

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 10/19

10:10 am-10:45 am

1 stop16h 35m

Helsinki-Vantaa

Tue 10/28

12:30 pm-11:18 pm

1 stop17h 48m

$569

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 10/19

12:25 pm-12:40 am

2 stops28h 15m

Helsinki-Vantaa

Tue 10/28

1:55 pm-10:07 am

2 stops27h 12m

$637

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sun 10/19

3:30 pm-12:50 pm

1 stop13h 20m

Helsinki-Vantaa

Tue 10/28

7:35 pm-2:55 pm

2 stops26h 20m

$728

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Sat 10/18

5:28 pm-12:50 pm

2 stops35h 22m

Helsinki-Vantaa

Sun 10/26

1:50 pm-3:29 pm

2 stops56h 39m

$1,041

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/27

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 September.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice 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

What is the cheapest time of day to fly from STL to HEL?

Find hourly flight availability from St. Louis to Helsinki. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 30, 2025.

It’s typically best to fly out from St. Louis to Helsinki in the morning. Doing so could potentially save you 53% on the flight price compared to flying at noon, which is usually more expensive.

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 September 30, 2025.
Read through reviews of airlines operating flights from St. Louis to Helsinki, such as United Airlines, American Airlines, and Lufthansa. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,931 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Boarding

7.7

Crew

8.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
United Airlines
7.4
Good
8,931 reviews
United Airlines
7.4
Good
8,931 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Boarding

7.7

Crew

8.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,931 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Boarding

7.7

Crew

8.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
Lufthansa
6.8
Okay
7,439 reviews
United Airlines
7.4
Good
8,931 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Boarding

7.7

Crew

8.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.

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 16h 35m. United Airlines provides one of the quickest options available for as low as $569. 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 are the cheapest airlines flying from St. Louis to Helsinki round-trip?

    American Airlines, at $479, was found to be the cheapest airline from St. Louis to Helsinki.Alternate airlines to your destination round-trip include Lufthansa and United Airlines. These flights start at 47% 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.

  • What is the cheapest month to book a flight from St. Louis to Helsinki?

    Currently, November is the cheapest month in which you can book a flight from St. Louis to Helsinki (average of $444). Flying from St. Louis to Helsinki in June is currently the most expensive (average of $1,083). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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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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 3 airlines flying from St. Louis to Helsinki

Discover the top 3 airlines 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 September 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$479Average$668FlexibilityNo cancel feeOn-time71%
LufthansaCheapest$533Average$686FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$551Average$636FlexibilityNo cancel feeOn-time69%

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