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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 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HEL
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$481
(Finnair)

Popular in

May

Cheapest in

November

Average price

$1,228
From Lambert-St Louis to Helsinki-Vantaa
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Highest demand for flights based on searches. 12% potential increase in price ($130 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($35 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Finnair deal was found by Cheapflights users on 6/12. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/35:26 amSTL - HEL
1 stop21h 19mMultiple Airlines
Tue 12/912:30 pmHEL - STL
1 stop13h 45mMultiple Airlines
Deal found 6/12$481
This American Airlines deal was found by Cheapflights users on 6/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:54 pmSTL - HEL
2 stops17h 01mAmerican Airlines
Tue 12/912:30 pmHEL - STL
2 stops18h 35mAmerican Airlines
Deal found 6/12$486
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Wed 12/34:30 pmSTL - HEL
2 stops18h 10mUnited Airlines
Tue 12/97:05 amHEL - STL
3 stops23h 01mUnited Airlines
Deal found 6/12$515
This Orbitz deal was found by Cheapflights users on 6/12. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/243:59 pmSTL - HEL
2 stops38h 21mBritish Airways
Sun 9/289:05 pmHEL - STL
2 stops34h 43mBritish Airways
Deal found 6/12$604
This Delta deal was found by Cheapflights users on 6/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/105:23 pmSTL - HEL
2 stops16h 17mDelta
Thu 7/176:40 amHEL - STL
2 stops21h 56mDelta
Deal found 6/12$1,095
This Air Canada deal was found by Cheapflights users on 6/12. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/31:27 pmSTL - HEL
3 stops19h 03mAir Canada
Tue 12/97:05 amHEL - STL
3 stops20h 20mAir Canada
Deal found 6/12$1,282

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 June 12, 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

Wed 12/3

5:26 am-10:45 am

1 stop21h 19m

Helsinki-Vantaa

Tue 12/9

12:30 pm-6:15 pm

1 stop13h 45m

$481

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 12/3

12:54 pm-1:55 pm

2 stops17h 01m

Helsinki-Vantaa

Tue 12/9

12:30 pm-11:05 pm

2 stops18h 35m

$486

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 12/3

4:30 pm-6:40 pm

2 stops18h 10m

Helsinki-Vantaa

Tue 12/9

7:05 am-10:06 pm

3 stops23h 01m

$515

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 9/24

3:59 pm-2:20 pm

2 stops38h 21m

Helsinki-Vantaa

Sun 9/28

9:05 pm-11:48 pm

2 stops34h 43m

$604

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Thu 7/10

5:23 pm-5:40 pm

2 stops16h 17m

Helsinki-Vantaa

Thu 7/17

6:40 am-8:36 pm

2 stops21h 56m

$1,095

St. LouisHelsinki

STL - HEL

STLHEL

Lambert-St Louis

Wed 12/3

1:27 pm-4:30 pm

3 stops19h 03m

Helsinki-Vantaa

Tue 12/9

7:05 am-7:25 pm

3 stops20h 20m

$1,282

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

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 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 $1,081). 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 June 12, 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.

Rainfall in Helsinki by month

Plan your trip to Helsinki by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Helsinki ranges from 1.2 - 2.8 inches per month. August is typically the wettest month, when rainfall can reach 2.8 in. February is typically the driest time to visit Helsinki when rainfall is around 1.2 in.

Temperature in Helsinki by month

Plan your trip to Helsinki by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Helsinki, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 60.8 F. Travelers looking to avoid the cold should look outside of February, when temperatures are typically at their lowest (around 21.2 F).

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 June 12, 2025.
Delta
8.0
Very good
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,946 reviews
Delta
8.0
Very good
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
9,537 reviews
Delta
8.0
Very good
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
British Airways
6.6
Okay
7,008 reviews
Delta
8.0
Very good
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection 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.

  • What are the cheapest airlines flying from St. Louis to Helsinki round-trip?

    American Airlines, at $486, was found to be the cheapest airline from St. Louis to Helsinki.Alternate airlines to your destination round-trip include United Airlines and British Airways. These flights start at 48% 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 $1,081). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Vantaa
Lahti

Browse thousands of different options on Cheapflights for your next trip

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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 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$479Average$588FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$495Average$528FlexibilityNo cancel feeOn-time70%
FinnairCheapest$506Average$800FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$533Average$803FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$576Average$576FlexibilityNo cancel feeOn-time69%

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