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$481+ 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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HEL
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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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 November 13, 2025.

This Delta deal was found by Cheapflights users on 11/11. 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.
Tue 12/96:05 pmSTL - HEL
2 stops14h 20mDelta
Tue 12/166:30 amHEL - STL
2 stops36h 15mDelta
Deal found 11/11$481
This Delta deal was found by Cheapflights users on 11/11. 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.
Tue 12/92:38 pmSTL - HEL
2 stops17h 47mDelta
Mon 12/156:30 amHEL - STL
2 stops35h 20mDelta
Deal found 11/11$491
This United Airlines deal was found by Cheapflights users on 11/12. 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 11/161:10 pmSTL - HEL
2 stops21h 40mUnited Airlines
Sat 11/2212:45 pmHEL - STL
2 stops38h 31mUnited Airlines
Deal found 11/12$555
This Delta deal was found by Cheapflights users on 11/11. 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.
Tue 12/99:50 amSTL - HEL
2 stops22h 35mDelta
Thu 12/186:30 amHEL - STL
2 stops23h 27mDelta
Deal found 11/11$591
This Delta deal was found by Cheapflights users on 11/11. 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.
Tue 12/912:49 pmSTL - HEL
2 stops19h 36mDelta
Wed 12/176:30 amHEL - STL
2 stops18h 19mDelta
Deal found 11/11$653
This Trip.com deal was found by Cheapflights users on 11/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/163:50 pmSTL - HEL
1 stop25h 30mLufthansa
Sat 11/221:50 pmHEL - STL
1 stop32h 05mLufthansa
Deal found 11/12$661
This Finnair deal was found by Cheapflights users on 11/10. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/97:00 amSTL - HEL
1 stop19h 45mMultiple Airlines
Tue 12/164:50 pmHEL - STL
1 stop25h 35mMultiple Airlines
Deal found 11/10$713
This United Airlines deal was found by Cheapflights users on 11/11. 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.
Wed 12/105:27 pmSTL - HEL
2 stops17h 23mUnited Airlines
Tue 12/167:05 amHEL - STL
2 stops35h 02mUnited Airlines
Deal found 11/11$773
This Delta deal was found by Cheapflights users on 11/11. 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.
Tue 12/92:38 pmSTL - HEL
2 stops17h 47mDelta
Fri 12/196:30 amHEL - STL
2 stops24h 57mDelta
Deal found 11/11$836
This United Airlines deal was found by Cheapflights users on 11/11. 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 12/91:00 pmSTL - HEL
2 stops19h 30mUnited Airlines
Sun 12/216:55 amHEL - STL
2 stops23h 48mUnited Airlines
Deal found 11/11$879

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 November 13, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$481
(Delta)

Popular in

May

Cheapest in

April

Average price

$803
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. 12% potential increase in price ($138 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($45 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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 November 13, 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

Mon 1/12

11:55 am-10:45 am

1 stop14h 50m

Helsinki-Vantaa

Mon 1/19

12:30 pm-7:29 pm

1 stop14h 59m

$483

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Mon 1/12

4:49 pm-6:50 pm

2 stops18h 01m

Helsinki-Vantaa

Mon 1/19

6:55 am-3:29 pm

2 stops40h 34m

$491

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Tue 12/9

7:00 am-10:45 am

1 stop19h 45m

Helsinki-Vantaa

Tue 12/16

4:50 pm-10:25 am

1 stop25h 35m

$713

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 12/10

6:42 pm-6:50 pm

2 stops16h 08m

Helsinki-Vantaa

Mon 12/15

6:55 am-12:15 pm

2 stops37h 20m

$773

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 12/10

5:27 pm-6:50 pm

2 stops17h 23m

Helsinki-Vantaa

Tue 12/16

7:05 am-10:07 am

2 stops35h 02m

$773

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Thu 12/11

1:35 pm-6:50 pm

2 stops21h 15m

Helsinki-Vantaa

Mon 12/15

12:45 pm-12:39 pm

2 stops31h 54m

$941

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 3/27

4:50 pm-1:05 pm

1 stop13h 15m

Helsinki-Vantaa

Tue 3/31

7:05 am-7:07 pm

2 stops20h 02m

$962

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Fri 3/27

4:05 pm-6:50 pm

2 stops19h 45m

Helsinki-Vantaa

Tue 3/31

12:50 pm-3:24 pm

2 stops58h 34m

$966

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/10

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 November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Helsinki flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 month to book a flight from St. Louis to Helsinki?

Currently, February is the cheapest month in which you can book a flight from St. Louis to Helsinki (average of $497). Flying from St. Louis to Helsinki in May is currently the most expensive (average of $1,475). 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.

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 November 13, 2025.

It’s typically best to fly out from St. Louis to Helsinki in the morning. Doing so could potentially save you 52% 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 November 13, 2025.
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
11,051 reviews

Food

6.4

Overall

7.2

Boarding

7.5

Comfort

7.2

Crew

8.0

Entertainment

6.9

Reviews

1 / 20
8.0
Excellent

Monica,Nov 2025

JAC - DFW

At least there was an option of entertainment on this flight.
American Airlines
7.2
Good
11,051 reviews
American Airlines
7.2
Good
11,051 reviews

Food

6.4

Overall

7.2

Boarding

7.5

Comfort

7.2

Crew

8.0

Entertainment

6.9

Reviews

1 / 20
8.0
Excellent

Monica,Nov 2025

JAC - DFW

At least there was an option of entertainment on this flight.

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 18h 01m. United Airlines provides one of the quickest options available for as low as $491. The distance from St. Louis to Helsinki is about 4678 mi.

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

    American Airlines, at $490, was found to be the cheapest airline from St. Louis to Helsinki.. This flight start at 50% 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, February is the cheapest month in which you can book a flight from St. Louis to Helsinki (average of $497). Flying from St. Louis to Helsinki in May is currently the most expensive (average of $1,475). 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 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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$490Average$776FlexibilityNo cancel feeOn-time71%

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