$339 Find Cheap Flights from St. Louis to Finland

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Finland departing on 9/7. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Book Cheap St. Louis to Finland Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Finland that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Finland

Mon, Sep 7 - Mon, Sep 21
Multiple Airlines Logo
8:55 am - 6:55 pm
STL
-
HEL
26h 00m
2 stops
Multiple Airlines Logo
6:15 pm - 1:25 pm
HEL
-
STL
27h 10m
1 stop
$738Multiple Airlines
Mon, Sep 7 - Mon, Sep 21
Multiple Airlines Logo
8:55 am - 6:55 pm
STL
-
HEL
26h 00m
2 stops
Multiple Airlines Logo
7:40 pm - 1:25 pm
HEL
-
STL
25h 45m
2 stops
$744Multiple Airlines
Mon, Sep 7 - Mon, Sep 21
Lufthansa Logo
3:30 pm - 1:10 pm
STL
-
HEL
13h 40m
1 stop
Lufthansa Logo
6:15 pm - 1:25 pm
HEL
-
STL
27h 10m
1 stop
$760Lufthansa
Sun, Nov 1 - Sat, Nov 14
American Airlines Logo
7:00 am - 11:10 am
STL
-
HEL
20h 10m
1 stop
American Airlines Logo
12:30 pm - 7:30 pm
HEL
-
STL
15h 00m
1 stop
$777American Airlines
Sun, Nov 1 - Sat, Nov 14
American Airlines Logo
2:08 pm - 1:55 pm
STL
-
HEL
15h 47m
2 stops
American Airlines Logo
12:30 pm - 7:30 pm
HEL
-
STL
15h 00m
1 stop
$782American Airlines
Sun, Nov 1 - Sat, Nov 14
American Airlines Logo
2:08 pm - 1:55 pm
STL
-
HEL
15h 47m
2 stops
American Airlines Logo
12:30 pm - 11:56 pm
HEL
-
STL
19h 26m
2 stops
$785American Airlines
Tue, Aug 4 - Tue, Aug 11
Multiple Airlines Logo
3:39 pm - 4:40 pm
STL
-
HEL
17h 01m
2 stops
Multiple Airlines Logo
7:00 am - 4:52 pm
HEL
-
STL
17h 52m
2 stops
$946Multiple Airlines
Tue, Aug 4 - Wed, Aug 12
Lufthansa Logo
3:30 pm - 5:00 pm
STL
-
HEL
17h 30m
1 stop
Lufthansa Logo
6:35 am - 10:00 pm
HEL
-
STL
23h 25m
2 stops
$953Lufthansa
Tue, Aug 4 - Tue, Aug 11
American Airlines Logo
5:58 pm - 2:15 pm
STL
-
HEL
12h 17m
1 stop
American Airlines Logo
12:30 pm - 11:23 pm
HEL
-
STL
18h 53m
2 stops
$954American Airlines
Wed, Jul 1 - Wed, Jul 15
Lufthansa Logo
1:13 pm - 12:40 am
STL
-
HEL
27h 27m
2 stops
Lufthansa Logo
6:35 am - 1:25 pm
HEL
-
STL
14h 50m
1 stop
$990Lufthansa
Booking Insights

KAYAK's insights & trends for St. Louis to Finland flights

Get data-powered insights and trends into flights from St. Louis to Finland to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from St. Louis to Finland?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Finland, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Finland is January, when tickets cost $0 (return) on average. On the other hand, the most expensive months are June and March, when the average cost of round-trip tickets is $1,068 and $791 respectively.

Find deals

Good to know

Low seasonFebruary
Cheapest flight$339
Best time to beat the crowds with an average 29% drop in price.
Most popular time to fly with an average 41% increase in price.
Flight from St. Louis to Helsinki

FAQs - booking Finland flights

  • How does KAYAK find such low prices on flights from St. Louis to Finland?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Finland.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Finland?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from St. Louis to Finland is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Finland?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from St. Louis to Finland with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Finland?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from St. Louis to Finland up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from St. Louis to Finland

 
Need help choosing which airline to fly with from St. Louis to Finland? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
American AirlinesOverall score based on 11662 reviews
7.9Crew
7.5Boarding
6.4Food
7.2Comfort
6.9Entertainment
Airline reviews

Fine. Nothing to write home about. The plane left on time, and arrived on time.

6.0 GoodRobert, May 2026
PHL - CLE
Read more American Airlines reviews

Fine. Nothing to write home about. The plane left on time, and arrived on time.

I was downgraded from first class to coach due to an airplane change. They pulled me out of line and I was the very last person to board the plane stuck in the middle seat with no overhead place to put my carry-.on. Very poor customer service.

Seat comfort was poor (no lumbar or lower back support).

The airplane seats were spacious and comfortable, and the flight attendants were friendly and attentive. The food was delicious like never before. The blankets and toiletries were thoughtfully provided. The captain's navigation was steady and reliable. In short, having flown with Starlux, I won't consider any other airline next time.

STOP MAKING THE SEATING SO CRAMPED. WE NEED A PASSENGER BILL OF RIGHTS!

The passenger in front of of me reclined their seat back all the way the entire flight. Their headrest was in my face the entire flight! I barely had room for the little plastic cup of water to fit on my tray table; can you make the seats and space between the rows any smaller??? You can’t even get up to use the restroom! Worst flight I’ve had in a very long time!

We had several flights and they were all on-time and flawless

My Frequent Flyer nber wasn't put on as I was told it was..... This resulted in a last group boarding and no priority tags on My bags.

Premium Economy Good crew, good service, excellent food. Seat back screen just not bright enough.

Terrible steward... Plane was quite empty... I asked to move "back" in the plane and the steward said no... Unnecessary power trip of mediocre people.

Everything you need to know for your flight from St. Louis to Finland

Information on your arrival and departure airports

St. Louis (STL)