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$419+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HEL
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
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 August 14, 2025.

Round-trip from

$1,614
(Finnair)

One-way from

$419
(American Airlines)

Popular in

June

Cheapest in

November

Average price

$1,103
From Lambert-St Louis to Helsinki-Vantaa
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One-way flight from Lambert-St Louis to Helsinki-Vantaa
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Highest demand for flights based on searches. 19% potential increase in price ($224 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in August 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 August 14, 2025.

This Finnair deal was found by Cheapflights users on 8/13. 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.
Sat 12/205:21 amSTL - HEL
1 stop21h 29mMultiple Airlines
Sat 1/312:25 pmHEL - STL
1 stop19h 16mMultiple Airlines
Deal found 8/13$1,614

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 August 14, 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

Sat 12/20

5:21 am-10:50 am

1 stop21h 29m

Helsinki-Vantaa

Sat 1/3

12:25 pm-11:41 pm

1 stop19h 16m

$1,614

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Mon 10/20

7:01 am-10:45 am

1 stop19h 44m

$419

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

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 August 14, 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 August 14, 2025.
Read through reviews of airlines operating flights from St. Louis to Helsinki, such as Finnair, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,321 reviews

Crew

8.1

Boarding

7.6

Comfort

7.5

Entertainment

6.9

Overall

7.6

Food

6.7

Reviews

1 / 20
6.0
Good

Rowland,Dec 2024

FRA - HEL

Finnair need to get a better system for boarding. Hundreds of passengers all attempting to get their boarding cards and passports checked at the gate and then get onto the aircraft is ridiculous, time consuming and frankly unfair to passengers.
Finnair
7.6
Good
1,321 reviews
Finnair
7.6
Good
1,321 reviews

Crew

8.1

Boarding

7.6

Comfort

7.5

Entertainment

6.9

Overall

7.6

Food

6.7

Reviews

1 / 20
6.0
Good

Rowland,Dec 2024

FRA - HEL

Finnair need to get a better system for boarding. Hundreds of passengers all attempting to get their boarding cards and passports checked at the gate and then get onto the aircraft is ridiculous, time consuming and frankly unfair to passengers.
United Airlines
7.4
Good
8,916 reviews
Finnair
7.6
Good
1,321 reviews

Crew

8.1

Boarding

7.6

Comfort

7.5

Entertainment

6.9

Overall

7.6

Food

6.7

Reviews

1 / 20
6.0
Good

Rowland,Dec 2024

FRA - HEL

Finnair need to get a better system for boarding. Hundreds of passengers all attempting to get their boarding cards and passports checked at the gate and then get onto the aircraft is ridiculous, time consuming and frankly unfair to passengers.
American Airlines
7.2
Good
10,000 reviews
Finnair
7.6
Good
1,321 reviews

Crew

8.1

Boarding

7.6

Comfort

7.5

Entertainment

6.9

Overall

7.6

Food

6.7

Reviews

1 / 20
6.0
Good

Rowland,Dec 2024

FRA - HEL

Finnair need to get a better system for boarding. Hundreds of passengers all attempting to get their boarding cards and passports checked at the gate and then get onto the aircraft is ridiculous, time consuming and frankly unfair to passengers.
Lufthansa
6.8
Okay
7,317 reviews
Finnair
7.6
Good
1,321 reviews

Crew

8.1

Boarding

7.6

Comfort

7.5

Entertainment

6.9

Overall

7.6

Food

6.7

Reviews

1 / 20
6.0
Good

Rowland,Dec 2024

FRA - HEL

Finnair need to get a better system for boarding. Hundreds of passengers all attempting to get their boarding cards and passports checked at the gate and then get onto the aircraft is ridiculous, time consuming and frankly unfair to passengers.
British Airways
6.7
Okay
7,266 reviews
Finnair
7.6
Good
1,321 reviews

Crew

8.1

Boarding

7.6

Comfort

7.5

Entertainment

6.9

Overall

7.6

Food

6.7

Reviews

1 / 20
6.0
Good

Rowland,Dec 2024

FRA - HEL

Finnair need to get a better system for boarding. Hundreds of passengers all attempting to get their boarding cards and passports checked at the gate and then get onto the aircraft is ridiculous, time consuming and frankly unfair to passengers.

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.

  • 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 British Airways and Finnair. These flights start at 49% 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 $1,082). 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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Top 5 airlines flying from St. Louis to Helsinki

Discover the top 5 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$479Average$588FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$500Average$695FlexibilityNo cancel feeOn-time70%
FinnairCheapest$506Average$800FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$533Average$686FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$576Average$715FlexibilityNo cancel feeOn-time69%

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