$804 Cheap Flights from Helsinki (HEL) to St. Louis (STL)

View $804 flight on Thu, Jan 8, 2026Opens in a new window

Popular airlines from Helsinki-Vantaa Airport (HEL) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from Helsinki to St. Louis (HEL-STL)

Prices were available within the past 7 days and start at $804 for one-way flights and $894 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Sat, Apr 11 - Fri, May 8
HEL
Helsinki
STL
St. Louis
$894 Roundtrip, found 18 hours ago
$894
Roundtrip
found 18 hours ago
Select British Airways flight, departing Sat, Apr 11 from Helsinki to St. Louis, returning Fri, May 8, priced at $894 found 18 hours ago
Lufthansa
Fri, Apr 3 - Sun, Apr 12
HEL
Helsinki
STL
St. Louis
$900 Roundtrip, found 2 days ago
$900
Roundtrip
found 2 days ago
Select Lufthansa flight, departing Fri, Apr 3 from Helsinki to St. Louis, returning Sun, Apr 12, priced at $900 found 2 days ago
American Airlines
Sat, Apr 11 - Fri, May 8
HEL
Helsinki
STL
St. Louis
$910 Roundtrip, found 18 hours ago
$910
Roundtrip
found 18 hours ago
Select American Airlines flight, departing Sat, Apr 11 from Helsinki to St. Louis, returning Fri, May 8, priced at $910 found 18 hours ago
Lufthansa
Thu, Nov 27 - Tue, Dec 2
HEL
Helsinki
STL
St. Louis
$915 Roundtrip, found 3 days ago
$915
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Thu, Nov 27 from Helsinki to St. Louis, returning Tue, Dec 2, priced at $915 found 3 days ago
Lufthansa
Sun, Mar 15 - Fri, Mar 27
HEL
Helsinki
STL
St. Louis
$916 Roundtrip, found 3 days ago
$916
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Sun, Mar 15 from Helsinki to St. Louis, returning Fri, Mar 27, priced at $916 found 3 days ago
Lufthansa
Thu, Nov 27 - Tue, Dec 2
HEL
Helsinki
STL
St. Louis
$918 Roundtrip, found 3 days ago
$918
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Thu, Nov 27 from Helsinki to St. Louis, returning Tue, Dec 2, priced at $918 found 3 days ago
Lufthansa
Fri, Apr 3 - Sun, Apr 12
HEL
Helsinki
STL
St. Louis
$923 Roundtrip, found 2 days ago
$923
Roundtrip
found 2 days ago
Select Lufthansa flight, departing Fri, Apr 3 from Helsinki to St. Louis, returning Sun, Apr 12, priced at $923 found 2 days ago
Lufthansa
Sun, Mar 15 - Fri, Mar 27
HEL
Helsinki
STL
St. Louis
$923 Roundtrip, found 3 days ago
$923
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Sun, Mar 15 from Helsinki to St. Louis, returning Fri, Mar 27, priced at $923 found 3 days ago
Air Canada
Thu, Nov 27 - Tue, Dec 2
HEL
Helsinki
STL
St. Louis
$928 Roundtrip, found 3 days ago
$928
Roundtrip
found 3 days ago
Select Air Canada flight, departing Thu, Nov 27 from Helsinki to St. Louis, returning Tue, Dec 2, priced at $928 found 3 days ago
Delta
Thu, Nov 27 - Tue, Dec 2
HEL
Helsinki
STL
St. Louis
$932 Roundtrip, found 3 days ago
$932
Roundtrip
found 3 days ago
Select Delta flight, departing Thu, Nov 27 from Helsinki to St. Louis, returning Tue, Dec 2, priced at $932 found 3 days ago

Frequently asked questions

How much does a flight from Vantaa Airport (HEL) to Lambert-St. Louis Intl. Airport (STL) cost?
Lock in a cheap one-way flight from $804 or cheap return flight from $894 from Vantaa Airport (HEL) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Vantaa Airport (HEL) to Lambert-St. Louis Intl. Airport (STL)?
April is the cheapest month to fly from HEL to STL. Avoiding peak travel times is often the key to better flight prices.
What is the cheapest airline that flies from Vantaa Airport (HEL) to Lambert-St. Louis Intl. Airport (STL)?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll fly you from HEL to STL. Then, sort your results by "Price (lowest to highest)" to score a good deal.
How many flights per day from Vantaa Airport (HEL) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from Vantaa Airport (HEL) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel details and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from HEL to STL?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Vantaa Airport (HEL) to Lambert-St. Louis Intl. Airport (STL)?
To touch down at Lambert-St. Louis Intl. Airport (STL) without delays, opt for a flight that leaves from Vantaa Airport (HEL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Vantaa Airport (HEL) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Holding off until right before your break to book your flight from HEL to STL often results in higher prices. Although you may find some last-minute offers, they aren't always guaranteed. Allow some flexibility in your schedule to boost your chances of getting a bargain.
Is it cheaper to book a HEL to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking a HEL to STL flight and hotel package with Expedia could lead to significant savings. Better yet, managing everything in one place takes the hassle out of planning your trip. Simply pick your flights and select from our extensive range of stays, then customize your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from Vantaa Airport (HEL) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your HEL to STL flight in the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you want more information.

Travel information

Origin airport
Vantaa
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Air Canada, Air France, American Airlines, British Airways, Delta, Finnair, Iberia, KLM, Lufthansa, United
Roundtrip price
$893
Distance
4681 mi

Book with confidence

Helsinki to St. Louis Flights

The cheapest times to fly from Helsinki to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Helsinki to St. Louis are during the month of April. You can find some of the cheapest flights from Helsinki to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Helsinki to St. Louis

Sunday is one of the best days to book for cheap flights from Helsinki to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Helsinki to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Helsinki to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $804 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Helsinki to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Helsinki to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Helsinki to St. Louis Flights

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*Available to One Key members.