$637+ 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 9/21. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HEL
Oct 11 — Oct 181
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Helsinki with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Helsinki
Cheapest
Best
Last-minute
Cheapest flights from St. Louis to HelsinkiExplore 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 September 11, 2026.
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 September 11, 2026.
This KLM deal was found by Cheapflights users on 9/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/215:47 pm -
2 stops15h 53m
Wed 9/307:00 am -
2 stops18h 10m
Deal found 9/10![KLM logo]()
$637
This Delta deal was found by Cheapflights users on 9/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/255:35 pm -
2 stops16h 50m
Sun 11/16:40 am -
2 stops22h 29m
Deal found 9/10![Delta logo]()
$687
This American Airlines deal was found by Cheapflights users on 9/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/256:32 am -
1 stop22h 08m
Sun 11/112:30 pm -
1 stop19h 03m
Deal found 9/10![American Airlines logo]()
$703
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/259:59 am -
2 stops18h 51m
Sun 11/112:35 pm -
3 stops61h 30m
Deal found 9/10![United Airlines logo]()
$741
This Expedia deal was found by Cheapflights users on 9/8. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/212:58 pm -
1 stop13h 32m
Tue 12/81:25 pm -
1 stop16h 22m
Deal found 9/8![Finnair logo]()
$761
This Finnair deal was found by Cheapflights users on 9/7. 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 12/29:12 am -
1 stop20h 43m
Tue 12/84:50 pm -
1 stop23h 52m
Deal found 9/7![Multiple Airlines logo]()
$781
This American Airlines deal was found by Cheapflights users on 9/8. 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 12/21:58 pm -
2 stops15h 57m
Tue 12/812:30 pm -
1 stop15h 49m
Deal found 9/8![American Airlines logo]()
$785
This FlightHub deal was found by Cheapflights users on 9/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/213:30 pm -
1 stop17h 30m
Wed 9/306:35 am -
2 stops22h 34m
Deal found 9/10![Lufthansa logo]()
$795
This United Airlines deal was found by Cheapflights users on 9/7. 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 12/28:30 am -
3 stops26h 15m
Tue 12/812:35 pm -
2 stops18h 39m
Deal found 9/7![United Airlines logo]()
$797
This Iberia deal was found by Cheapflights users on 9/7. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2212:46 pm -
1 stop14h 14m
Thu 10/294:25 pm -
1 stop14h 54m
Deal found 9/7![Multiple Airlines logo]()
$831
Best flights from St. Louis to HelsinkiDiscover carefully curated flight deals from St. Louis to Helsinki that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.
Discover carefully curated flight deals from St. Louis to Helsinki that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.
This KLM deal was found by Cheapflights users on 9/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/215:47 pm -
2 stops15h 53m
Wed 9/307:00 am -
2 stops18h 10m
Deal found 9/10![KLM logo]()
$637
This Delta deal was found by Cheapflights users on 9/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:20 pm -
2 stops15h 20m
Wed 9/307:00 am -
2 stops18h 10m
Deal found 9/10![Delta logo]()
$637
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/259:59 am -
2 stops18h 51m
Sun 11/112:35 pm -
3 stops61h 30m
Deal found 9/10![United Airlines logo]()
$741
This Travelocity deal was found by Cheapflights users on 9/10. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:29 am -
1 stop22h 41m
Wed 9/3012:20 pm -
1 stop19h 23m
Deal found 9/10![Multiple Airlines logo]()
$907
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/89:22 am -
2 stops25h 23m
Thu 2/1112:35 pm -
2 stops16h 38m
Deal found 9/10![United Airlines logo]()
$748
This United Airlines deal was found by Cheapflights users on 9/9. 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 2/21:09 pm -
2 stops21h 36m
Fri 2/512:35 pm -
2 stops36h 18m
Deal found 9/9![United Airlines logo]()
$753
This Delta deal was found by Cheapflights users on 9/7. 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 10/2212:28 pm -
2 stops21h 12m
Thu 10/296:40 am -
2 stops18h 35m
Deal found 9/7![Delta logo]()
$848
This United Airlines deal was found by Cheapflights users on 9/8. 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 12/28:30 am -
3 stops26h 15m
Tue 12/812:35 pm -
2 stops18h 39m
Deal found 9/8![United Airlines logo]()
$797
This United Airlines deal was found by Cheapflights users on 9/8. 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.
Thu 10/227:30 am -
3 stops27h 25m
Thu 10/2912:35 pm -
2 stops27h 20m
Deal found 9/8![United Airlines logo]()
$852
Last-minute flights from St. Louis to HelsinkiDiscover last-minute flight deals from St. Louis to Helsinki. Data last updated September 11, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Helsinki. Data last updated September 11, 2026 and is based on user searches.
This KLM deal was found by Cheapflights users on 9/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/215:47 pm -
2 stops15h 53m
Wed 9/307:00 am -
2 stops18h 10m
Deal found 9/10![KLM logo]()
$637
This FlightHub deal was found by Cheapflights users on 9/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/213:30 pm -
1 stop17h 30m
Wed 9/306:35 am -
2 stops22h 34m
Deal found 9/10![Lufthansa logo]()
$795
This Delta deal was found by Cheapflights users on 9/8. 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 10/85:35 pm -
2 stops16h 05m
Tue 10/137:00 am -
2 stops21h 51m
Deal found 9/8![Delta logo]()
$848
This oojo deal was found by Cheapflights users on 9/8. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1312:00 pm -
2 stops19h 20m
Fri 10/169:05 pm -
2 stops34h 49m
Deal found 9/8![Scandinavian Airlines logo]()
$838
This Iberia deal was found by Cheapflights users on 9/7. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2212:46 pm -
1 stop14h 14m
Thu 10/294:25 pm -
1 stop14h 54m
Deal found 9/7![Multiple Airlines logo]()
$831
This American Airlines deal was found by Cheapflights users on 9/7. 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.
Thu 10/221:06 pm -
1 stop17h 09m
Thu 10/2912:30 pm -
2 stops18h 49m
Deal found 9/7![American Airlines logo]()
$837
This United Airlines deal was found by Cheapflights users on 9/7. 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.
Thu 10/227:30 am -
3 stops27h 25m
Thu 10/2912:35 pm -
2 stops27h 20m
Deal found 9/7![United Airlines logo]()
$852
This Delta deal was found by Cheapflights users on 9/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/255:35 pm -
2 stops16h 50m
Sun 11/16:40 am -
2 stops22h 29m
Deal found 9/10![Delta logo]()
$687
This American Airlines deal was found by Cheapflights users on 9/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/256:32 am -
1 stop22h 08m
Sun 11/112:30 pm -
1 stop19h 03m
Deal found 9/10![American Airlines logo]()
$703
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/259:59 am -
2 stops18h 51m
Sun 11/112:35 pm -
3 stops61h 30m
Deal found 9/10![United Airlines logo]()
$741
Find 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 September 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $637 (KLM) |
Popular in | December |
Cheapest in | February |
Average price | $958 |
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 7,457,451 searches. Data last updated September 11, 2026.
Use the filters below to find and compare flights from St. Louis to Helsinki that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisHelsinki
STL Lambert-St Louis - HEL Helsinki-Vantaa
STLHEL
Lambert-St Louis
Mon 9/21
5:47 pm-5:40 pm
2 stops15h 53m
Helsinki-Vantaa
Wed 9/30
7:00 am-5:10 pm
2 stops18h 10m
$637
Quickest round-trip
St. LouisHelsinki
STL Lambert-St Louis - HEL Helsinki-Vantaa
STLHEL
Lambert-St Louis
Mon 9/21
6:20 pm-5:40 pm
2 stops15h 20m
Helsinki-Vantaa
Wed 9/30
7:00 am-5:10 pm
2 stops18h 10m
$637
St. LouisHelsinki
STL Lambert-St Louis - HEL Helsinki-Vantaa
STLHEL
Lambert-St Louis
Sun 10/25
9:59 am-11:50 am
2 stops18h 51m
Helsinki-Vantaa
Sun 11/1
12:35 pm-6:05 pm
3 stops61h 30m
$741
St. LouisHelsinki
STL Lambert-St Louis - HEL Helsinki-Vantaa
STLHEL
Lambert-St Louis
Mon 2/8
9:22 am-6:45 pm
2 stops25h 23m
Helsinki-Vantaa
Thu 2/11
12:35 pm-9:13 pm
2 stops16h 38m
$748
St. LouisHelsinki
STL Lambert-St Louis - HEL Helsinki-Vantaa
STLHEL
Lambert-St Louis
Tue 2/2
1:09 pm-6:45 pm
2 stops21h 36m
Helsinki-Vantaa
Fri 2/5
12:35 pm-4:53 pm
2 stops36h 18m
$753
St. LouisHelsinki
STL Lambert-St Louis - HEL Helsinki-Vantaa
STLHEL
Lambert-St Louis
Wed 12/2
8:30 am-6:45 pm
3 stops26h 15m
Helsinki-Vantaa
Tue 12/8
12:35 pm-11:14 pm
2 stops18h 39m
$797
St. LouisHelsinki
STL Lambert-St Louis - HEL Helsinki-Vantaa
STLHEL
Lambert-St Louis
Thu 10/22
12:28 pm-5:40 pm
2 stops21h 12m
Helsinki-Vantaa
Thu 10/29
6:40 am-6:15 pm
2 stops18h 35m
$848
St. LouisHelsinki
STL Lambert-St Louis - HEL Helsinki-Vantaa
STLHEL
Lambert-St Louis
Thu 10/22
7:30 am-6:55 pm
3 stops27h 25m
Helsinki-Vantaa
Thu 10/29
12:35 pm-8:55 am
2 stops27h 20m
$852
St. LouisHelsinki
STL Lambert-St Louis - HEL Helsinki-Vantaa
STLHEL
Lambert-St Louis
Mon 9/21
6:29 am-1:10 pm
1 stop22h 41m
Helsinki-Vantaa
Wed 9/30
12:20 pm-11:43 pm
1 stop19h 23m
$907
Sorted by cheapest first
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Helsinki flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Helsinki flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.
STL-HEL
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.
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 September 11, 2026.
Read through reviews of airlines operating flights from St. Louis to Helsinki, such as Finnair and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.6
Crew
8.2
Comfort
7.4
Entertainment
6.9
Boarding
7.7
Food
6.7
Reviews
1 / 20
6.0
GoodGurinder,Aug 2026
BKK - HEL
Overall
7.6
Crew
8.2
Comfort
7.4
Entertainment
6.9
Boarding
7.7
Food
6.7
Reviews
1 / 20
6.0
GoodGurinder,Aug 2026
BKK - HEL
Overall
7.6
Crew
8.2
Comfort
7.4
Entertainment
6.9
Boarding
7.7
Food
6.7
Reviews
1 / 20
6.0
GoodGurinder,Aug 2026
BKK - HEL
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.
Traveling to a place near Helsinki?
Book flights to Helsinki if you plan to visit one of these locationsVantaa
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Other flights to Helsinki
Explore flights to Helsinki departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 11, 2026.
St. Louis and Helsinki flights
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Top 2 airlines flying from St. Louis to Helsinki
Discover the top 2 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 7,457,451 searches. Data last updated September 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$433 | Average$747 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$484 | Average$764 | FlexibilityNo cancel fee | On-time71% |