Trip.com
>
Flights
>
Flights to Finland
>
Flights to Uusimaa
>
Flights to Helsinki
Hotels in Helsinki
>
Flights from St. Louis to Helsinki

What to know about flights from St. Louis to Helsinki?

The distance between St. Louis and Helsinki is approximately 7,539.32 km. Based on Trip.com's data, travel demand peaks in November.

Cheapest one-way
$474
American Airlines American Airlines STL-HEL 21h 40m · 1 stop Sun, Nov 1
Select flight
Cheapest round-trip
$566
American Airlines American Airlines STL-HEL 20h 43m · 2 stops Thu, Nov 12 - Wed, Nov 18
Select flight
Recommended airlines
American Airlines American AirlinesCheapest· From $474 KLM KLMMost booked
When to travel
December
Cheapest
November
Peak season for travel
Route details
7,539.32 km
Flight distance

Explore the cheapest one-way and round-trip flights from St. Louis to Helsinki over the next 90 days, with one-way fares from $474 and round-trip from $566. Based on Trip.com's latest 7-day flight data.

    • STL 9:12 AM
      20h 43m
      1 stop
      HEL 1:55 PM
      St. Louis - Helsinki | Thu, Nov 12 | American Airlines
      HEL 4:50 PM
      23h 52m
      1 stop
      STL 8:42 AM
      Helsinki - St. Louis | Wed, Nov 18 | Finnair
      $566 $760
      26% off
      26% off
      $760 $566
    • STL 6:00 AM
      23h 55m
      1 stop
      HEL 1:55 PM
      St. Louis - Helsinki | Thu, Dec 3 | American Airlines
      HEL 4:50 PM
      23h 52m
      1 stop
      STL 8:42 AM
      Helsinki - St. Louis | Wed, Dec 9 | Finnair
      $569 $760
      25% off
      25% off
      $760 $569
    • STL 10:20 AM
      17h 20m
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Thu, Nov 12 | Iberia
      HEL 12:30 PM
      17h 29m
      1 stop
      STL 9:59 PM
      Helsinki - St. Louis | Wed, Nov 18 | Iberia
      $596 $760
      22% off
      22% off
      $760 $596
    • STL 12:58 PM
      14h 42m
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Thu, Nov 12 | Finnair
      HEL 12:30 PM
      15h 49m
      1 stop
      STL 8:19 PM
      Helsinki - St. Louis | Wed, Nov 18 | Finnair
      $601
      21% off
      $760 $601
    • STL 6:00 AM
      21h 40m
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Thu, Nov 12 | British Airways
      HEL 12:30 PM
      15h 49m
      1 stop
      STL 8:19 PM
      Helsinki - St. Louis | Wed, Nov 18 | British Airways
      $612
      19% off
      $760 $612
    • STL 11:32 AM
      19h 38m
      1 stop
      HEL 2:10 PM
      St. Louis - Helsinki | Fri, Oct 30 | American Airlines
      HEL 4:50 PM
      23h 52m
      1 stop
      STL 8:42 AM
      Helsinki - St. Louis | Fri, Nov 6 | Finnair
      $617
      19% off
      $760 $617
    • STL 9:12 AM
      20h 43m
      1 stop
      HEL 1:55 PM
      St. Louis - Helsinki | Sat, Nov 7 | American Airlines
      HEL 12:30 PM
      15h 52m
      1 stop
      STL 8:22 PM
      Helsinki - St. Louis | Sat, Nov 14 | Finnair
      $617
      19% off
      $760 $617
    • STL 11:31 AM
      18h 44m
      1 stop
      HEL 2:15 PM
      St. Louis - Helsinki | Fri, Oct 23 | American Airlines
      HEL 4:20 PM
      14h 59m
      1 stop
      STL 12:19 AM
      Helsinki - St. Louis | Fri, Oct 30 | Finnair
      $620
      18% off
      $760 $620
    • STL 6:32 AM
      22h 8m
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Mon, Oct 26 | American Airlines
      HEL 4:50 PM
      23h 52m
      1 stop
      STL 8:42 AM
      Helsinki - St. Louis | Mon, Nov 2 | Finnair
      $621
      18% off
      $760 $621
    • STL 1:00 PM
      17h 25m
      1 stop
      HEL 2:00 PM
      St. Louis - Helsinki | Tue, Oct 20 | Normal Airline
      HEL 3:00 PM
      6h
      Nonstop
      STL 4:00 PM
      Helsinki - St. Louis | Thu, Oct 22 | Normal Airline
      Find more flights
      Find more flights
    • Cheapest
      STL 6:00 AM
      21h 40m
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Sun, Nov 1 | American Airlines
      $474 $805
      41% off
      41% off
      $805 $474
    • STL 4:40 PM
      13h 15m
      1 stop
      HEL 12:55 PM
      St. Louis - Helsinki | Sun, Oct 25 | Lufthansa
      $488 $805
      39% off
      39% off
      $805 $488
    • STL 6:00 AM
      21h 40m
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Sun, Nov 1 | British Airways
      $494 $805
      39% off
      39% off
      $805 $494
    • STL 3:40 PM
      13h 15m
      1 stop
      HEL 12:55 PM
      St. Louis - Helsinki | Sun, Nov 1 | United Airlines
      $497
      38% off
      $805 $497
    • STL 8:48 AM
      19h 52m
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Sun, Oct 25 | Iberia
      $499
      38% off
      $805 $499
    • STL 5:40 AM
      23h
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Sun, Oct 25 | American Airlines
      $515
      36% off
      $805 $515
    • STL 3:40 PM
      13h 15m
      1 stop
      HEL 12:55 PM
      St. Louis - Helsinki | Sun, Nov 8 | Lufthansa
      $545
      32% off
      $805 $545
    • STL 10:20 AM
      17h 20m
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Tue, Dec 29 | Iberia
      $574
      17% off
      $692 $574
    • STL 10:20 AM
      17h 20m
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Tue, Dec 29 | American Airlines
      $595
      14% off
      $692 $595
    • STL 1:00 PM
      17h 25m
      1 stop
      HEL 2:00 PM
      St. Louis - Helsinki | Tue, Oct 20 | Normal Airline
      Find more flights
      Find more flights
    • STL 10:20 AM
      17h 20m
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Tue, Dec 29 | Iberia
      $574 $692
      17% off
      17% off
      $692 $574
    • STL 10:20 AM
      17h 20m
      1 stop
      HEL 11:40 AM
      St. Louis - Helsinki | Tue, Dec 29 | American Airlines
      $595 $692
      14% off
      14% off
      $692 $595
    • STL 1:00 PM
      17h 25m
      1 stop
      HEL 2:00 PM
      St. Louis - Helsinki | Tue, Oct 20 | Normal Airline
      Find more flights
      Find more flights

Displayed flight fares from St. Louis to Helsinki are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Which airlines are the most popular for St. Louis to Helsinki flights?

You can choose from 1 airlines that fly from St. Louis to Helsinki, including KLM, American Airlines has lowest fares on this route.
KLM logo KLM
Airlines are determined based on actual purchased flight tickets from St. Louis to Helsinki according to previous 12 months data from Trip.com.

Frequently Asked Questions

  • What are the cheapest flights from St. Louis to Helsinki (STL-HEL)?

    Based on Trip.com data, American Airlines offers one-way fares as low as $474 on Cheapest nonstop routes (e.g. STL to HEL on Sun, Nov 1), while American Airlines offers Cheapest nonstop round-trips from $566 departing on Thu, Nov 12 and returning on Wed, Nov 18.
  • At the moment, several airlines serve connecting flights from St. Louis to Helsinki, including: KLM Royal Dutch Airlines Selected airlines are based on historical data collected from flight bookings made by users on Trip.com within the last 90 days.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from St. Louis to Helsinki is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from St. Louis to Helsinki, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sun, Nov 1, with one-way flights priced at just $474.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is American Airlines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Helsinki travel is around November.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from St. Louis to Helsinki is December, when demand for travel is lower.
  • After crunching the numbers on our October flight calendar, it's currently cheapest to fly from St. Louis to Helsinki on October 25, 2026 with Lufthansa, with prices starting at $488.
  • You can arrive at any of the following airports in Helsinki: Helsinki Airport (HEL). Flights from St. Louis Lambert International Airport to Helsinki Airport (STL-HEL) are by far the most popular option for this route.
  • The time difference between Helsinki and St. Louis is 8h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.
  • Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from St. Louis to Helsinki is $568. Fares vary by travel date, airline and availability.
  • Enter St. Louis and Helsinki, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveler details and complete payment to receive your confirmation.

Explore More Popular Flights

Note: Prices shown on this page are estimated lowest price and include all taxes and fees found in the last 24 hours.

Book with no extra fees

Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, WLAN, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy.
Cancellation/change due to a flight schedule change:
If the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.