$403 Cheap Flights from St. Louis (STL) to Helsinki (HEL)

View $403 flight on Wed, Jan 7, 2026Opens in a new window

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

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

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

Prices were available within the past 7 days and start at $403 for one-way flights and $480 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Tue, Mar 10 - Tue, Mar 17
STL
St. Louis
HEL
Helsinki
$480 Roundtrip, found 1 day ago
$480
Roundtrip
found 1 day ago
Select British Airways flight, departing Tue, Mar 10 from St. Louis to Helsinki, returning Tue, Mar 17, priced at $480 found 1 day ago
British Airways
Mon, Nov 17 - Wed, Dec 3
STL
St. Louis
HEL
Helsinki
$482 Roundtrip, found 20 hours ago
$482
Roundtrip
found 20 hours ago
Select British Airways flight, departing Mon, Nov 17 from St. Louis to Helsinki, returning Wed, Dec 3, priced at $482 found 20 hours ago
Lufthansa
Mon, Nov 17 - Wed, Dec 3
STL
St. Louis
HEL
Helsinki
$484 Roundtrip, found 20 hours ago
$484
Roundtrip
found 20 hours ago
Select Lufthansa flight, departing Mon, Nov 17 from St. Louis to Helsinki, returning Wed, Dec 3, priced at $484 found 20 hours ago
United
Sun, Nov 23 - Wed, Dec 3
STL
St. Louis
HEL
Helsinki
$484 Roundtrip, found 2 days ago
$484
Roundtrip
found 2 days ago
Select United flight, departing Sun, Nov 23 from St. Louis to Helsinki, returning Wed, Dec 3, priced at $484 found 2 days ago
United
Tue, Apr 14 - Wed, Apr 29
STL
St. Louis
HEL
Helsinki
$486 Roundtrip, found 5 hours ago
$486
Roundtrip
found 5 hours ago
Select United flight, departing Tue, Apr 14 from St. Louis to Helsinki, returning Wed, Apr 29, priced at $486 found 5 hours ago
United
Mon, Nov 3 - Tue, Nov 11
STL
St. Louis
HEL
Helsinki
$490 Roundtrip, found 15 hours ago
$490
Roundtrip
found 15 hours ago
Select United flight, departing Mon, Nov 3 from St. Louis to Helsinki, returning Tue, Nov 11, priced at $490 found 15 hours ago
United
Tue, Apr 14 - Tue, Apr 28
STL
St. Louis
HEL
Helsinki
$491 Roundtrip, found 5 hours ago
$491
Roundtrip
found 5 hours ago
Select United flight, departing Tue, Apr 14 from St. Louis to Helsinki, returning Tue, Apr 28, priced at $491 found 5 hours ago
Lufthansa
Tue, Mar 10 - Tue, Mar 17
STL
St. Louis
HEL
Helsinki
$493 Roundtrip, found 1 day ago
$493
Roundtrip
found 1 day ago
Select Lufthansa flight, departing Tue, Mar 10 from St. Louis to Helsinki, returning Tue, Mar 17, priced at $493 found 1 day ago
Air Canada
Tue, Mar 10 - Tue, Mar 17
STL
St. Louis
HEL
Helsinki
$494 Roundtrip, found 1 day ago
$494
Roundtrip
found 1 day ago
Select Air Canada flight, departing Tue, Mar 10 from St. Louis to Helsinki, returning Tue, Mar 17, priced at $494 found 1 day ago
Delta
Mon, Apr 13 - Fri, May 1
STL
St. Louis
HEL
Helsinki
$495 Roundtrip, found 5 hours ago
$495
Roundtrip
found 5 hours ago
Select Delta flight, departing Mon, Apr 13 from St. Louis to Helsinki, returning Fri, May 1, priced at $495 found 5 hours ago

Find the cheapest month to fly from St. Louis (STL) to Helsinki (HEL)

November is typically the cheapest month to fly

From $457 - $1,335 per traveler.

Alternative airports near Helsinki

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Vantaa HEL. Cheapest option available. Average driving time to city center is 22 minutes. Flights from $763
HEL
Vantaa
Cheapest
Average driving time to city center22 min
Flights from $763

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Vantaa Airport (HEL) cost?
Lock in a cheap one-way flight from $403 or cheap return flight from $480 from Lambert-St. Louis Intl. Airport (STL) to Vantaa Airport (HEL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Vantaa Airport (HEL)?
March is the cheapest month to fly from STL to HEL. Avoiding peak travel times is often the key to finding a great deal.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Vantaa Airport (HEL)?
To find the cheapest airline flying from STL to HEL, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and ideal departure window. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Vantaa Airport (HEL)?
You'll need to hop on a flight with a layover when traveling from Lambert-St. Louis Intl. Airport (STL) to Vantaa Airport (HEL). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from STL to HEL?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change depending on a number of factors, including the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Vantaa Airport (HEL)?
To avoid potential delays on the Lambert-St. Louis Intl. Airport (STL) to Vantaa Airport (HEL) route, travel before 3 PM. Departures after this hour have a 22% higher chance of being canceled.**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 Lambert-St. Louis Intl. Airport (STL) to Vantaa Airport (HEL) last-minute?
Last-minute bookings from STL to HEL are typically more expensive. To secure the best prices, start searching for flights well in advance. That said, if your travel plans are flexible, you may land a cheap ticket right before your journey.
Is it cheaper to book a STL to HEL flight and hotel package?
Securing a STL to HEL flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Pick from our impressive range of accommodations and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Vantaa Airport (HEL)?
If you reserved your STL to HEL flight within the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the ticket type you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Vantaa
Airlines serving
Air Canada, Air France, American Airlines, British Airways, Delta, Finnair, Iberia, KLM, Lufthansa, Scandinavian Airlines, United
Roundtrip price
$479
Distance
4681 mi

Book with confidence

St. Louis to Helsinki Flights

The cheapest times to fly from St. Louis to Helsinki

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 St. Louis to Helsinki are during the month of March. You can find some of the cheapest flights from St. Louis to Helsinki with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to Helsinki: 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 St. Louis to Helsinki

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 St. Louis to Helsinki in 2025. You can also book with separate airlines for your outbound and return journeys, from $403 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 St. Louis to Helsinki 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 St. Louis to Helsinki 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.

 

St. Louis to Helsinki Flights

Explore a world of travel with Expedia

*Available to One Key members.