STL - HEL

$476 Find Cheap Flights from St. Louis to Helsinki

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 Helsinki departing on 6/15. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Helsinki

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Helsinki, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Helsinki, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$699
Scandinavian Airlines
Mon 9/7Mon 9/14
STL - HEL • 2 stops
Cheapest one-way
$476
United Airlines
Mon 6/15
STL - HEL • 2 stops
Top airlines
Cheapest • from $699 (round-trip)
Best reviews • 7.6 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between St. Louis and Helsinki. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $951 (round-trip)
Shortest trip • 13h 08m (one-way)
Insights
Insights
Insights
Insights
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Helsinki!
Flight Deals
Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Helsinki 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 Helsinki

Mon, Sep 7 - Mon, Sep 14
Scandinavian Airlines Logo
1:30 pm - 3:20 pm
STL
-
HEL
17h 50m
2 stops
Scandinavian Airlines Logo
6:10 am - 8:50 pm
HEL
-
STL
22h 40m
2 stops
$699Scandinavian Airlines
Thu, Apr 30 - Thu, May 7
American Airlines Logo
2:33 pm - 2:15 pm
STL
-
HEL
15h 42m
1 stop
American Airlines Logo
4:25 pm - 11:56 pm
HEL
-
STL
15h 31m
1 stop
$715American Airlines
Sun, Apr 12 - Tue, Apr 28
Multiple Airlines Logo
12:27 pm - 2:15 pm
STL
-
HEL
17h 48m
1 stop
Multiple Airlines Logo
12:20 pm - 7:30 pm
HEL
-
STL
15h 10m
1 stop
$718Multiple Airlines
Mon, Sep 7 - Mon, Sep 14
Scandinavian Airlines Logo
3:42 pm - 8:35 pm
STL
-
HEL
20h 53m
3 stops
Scandinavian Airlines Logo
6:10 am - 8:50 pm
HEL
-
STL
22h 40m
2 stops
$728Scandinavian Airlines
Mon, Sep 7 - Mon, Sep 14
Scandinavian Airlines Logo
3:42 pm - 8:35 pm
STL
-
HEL
20h 53m
3 stops
Scandinavian Airlines Logo
6:10 am - 8:50 pm
HEL
-
STL
22h 40m
2 stops
$729Scandinavian Airlines
Thu, Apr 30 - Thu, May 7
Multiple Airlines Logo
12:27 pm - 2:15 pm
STL
-
HEL
17h 48m
1 stop
Multiple Airlines Logo
4:25 pm - 10:19 pm
HEL
-
STL
13h 54m
1 stop
$731Multiple Airlines
Thu, Apr 30 - Thu, May 7
American Airlines Logo
4:30 pm - 2:15 pm
STL
-
HEL
13h 45m
1 stop
American Airlines Logo
12:35 pm - 10:19 pm
HEL
-
STL
17h 44m
2 stops
$737American Airlines
Mon, Sep 7 - Mon, Sep 14
Lufthansa Logo
6:55 pm - 6:55 pm
STL
-
HEL
16h 00m
2 stops
Lufthansa Logo
6:15 pm - 1:25 pm
HEL
-
STL
27h 10m
1 stop
$750Lufthansa
Sun, Apr 12 - Tue, Apr 28
Delta Logo
6:32 am - 1:05 pm
STL
-
HEL
22h 33m
2 stops
Delta Logo
7:00 am - 8:44 pm
HEL
-
STL
21h 44m
2 stops
$758Delta
Fri, Sep 11 - Sat, Sep 19
Multiple Airlines Logo
6:06 am - 2:15 pm
STL
-
HEL
24h 09m
1 stop
Multiple Airlines Logo
12:35 pm - 10:00 pm
HEL
-
STL
17h 25m
1 stop
$763Multiple Airlines
Booking Insights

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

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

Which airlines provide the cheapest flights from St. Louis to Helsinki?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from St. Louis to Helsinki were found on Scandinavian Airlines ($699) and American Airlines ($715).

Good to know

Low seasonFebruary
Cheapest flight$476
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

When to book flights from St. Louis to Helsinki

Are your dates flexible? Find out the best times to travel from St. Louis to Helsinki based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Helsinki

  • What is the cheapest flight from St. Louis to Helsinki?

    In the last 3 days, the lowest price for a flight from St. Louis to Helsinki was $476 for a one-way ticket and $699 for a round-trip.

  • Do I need a passport to fly between St. Louis and Helsinki?

    Yes, you’ll need a passport to travel to Helsinki from St. Louis.

  • Which aircraft models fly most regularly from St. Louis to Helsinki?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Helsinki?

    oneworld is the only airline alliance operating flights between St. Louis and Helsinki.

  • Which is the best airline for flights from St. Louis to Helsinki, Finnair or American Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Helsinki are Finnair and American Airlines. With an average price for the route of $784 and an overall rating of 7.7, Finnair is the most popular choice. American Airlines is also a great choice for the route, with an average price of $764 and an overall rating of 7.1.

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

    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 Helsinki.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Helsinki from St. Louis 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 Helsinki?

    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 to Helsinki with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and HEL can sometimes prove cheaper using this method.

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

    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 to Helsinki from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from St. Louis to Helsinki

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Helsinki. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Helsinki? 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.
7.6
FinnairOverall score based on 1373 reviews
6.9Entertainment
6.7Food
7.7Boarding
8.2Crew
7.5Comfort
Airline reviews

Positive: It was refreshingly easy and polite check-in and boarding staff. Flight was on time and Helsinki is a very well-signposted airport. Shopping was nice as well. Flight was not full and I had lots of space in economy. Flight was perfectly on time. Negative: Food and drink not very good, but that it is normal on any airline. Didn't expect anything else.

8.0 ExcellentFiruz, Feb 2026
HEL - ICN
Read more Finnair reviews

Positive: It was refreshingly easy and polite check-in and boarding staff. Flight was on time and Helsinki is a very well-signposted airport. Shopping was nice as well. Flight was not full and I had lots of space in economy. Flight was perfectly on time. Negative: Food and drink not very good, but that it is normal on any airline. Didn't expect anything else.

Business seating is soooo uncomfortable. You can sit straight up or lay down. You need pillows behind you because the back doesn’t lay down. Those are need to “prop” you up. The chair has no padding whatsoever. Food was gross. I’ve eaten on Finnair before and the food was exceptional. This time it gave 2 people in our party diarrhea. It was the chicken dish. I took 2 bites and didn’t eat anything more. The flight attendants were nice. You needed an additional lounge in Terminal D at DFW Airport. After waiting 40 minutes to enter, we finally gave up and went to a bar across from the club doors. I’m unsure if I’ll ever book a Finnair flight again.

Very good seat, very comfortable, good food, and good service.

It was a good flight, very comfortable seats for sleeping in business class. Probably the most comfortable business class seat I've ever had (20+ times in business class on various airlines). Service was good, but the only downside is my screen didn't work and it had to be reset multiple times to get it to shut off. I had to block my eyes because the screen was white almost the entire flight and I wore an eye mask when I slept. But when eating and reading in my seat, my eyes hurt because the only way to turn the screen off was reset it and the screen would only be off for a few minutes at a time.

Everything was wonderful! AirBus seats are more comfortable to sleep in as compared to the Boeing planes.

Great. It was awesome to have boarding from the front and back of the plane as it made the process go very quickly

It was okay. The airplane was a little smaller than a flight from Thailand to Helsinki.

Wish that everyone would board the back of the plane first. Also let kids on first. The gate wasn’t open at arrival and we waited 45 minutes to takeoff. They made up for time in the air.

We had an excellent trip with Finnair. This was our first time and we’re very pleased. The only issue was with the boarding - it was a little bit confusing and needs a little bit of streamlining.

Crew very lovely. Arrived an hour late due to bad weather. We were given new tickets to an other flight but it could have been organised better, so we did not have to run through the whole airport to.

Not good. One of my luggage is missing. And until now they can’t find it

Horrible experience upon landing. Probably more due to DCA utter incompetence than AA.

Jill was the flight attendant in first class she was fabulous!! Best flight attendant I have had in years.!! And I fly every other week. Other can learn from her!!

Really good. I accidentally left my duffel on the plane and the reps were so friendly in retrieving it.

My 9:50AM flight was delayed to 3:40PM "due to incoming aircraft delay". No aircraft is "delayed" that long. Found out once we did board (after several changes in times) that the aircraft had a maintenance issue and we had to wait for another aircraft. Just tell us that. The aircraft we did get was old and the seats need to be updated. I have been traveling for several weeks with AA and you should refresh your entertainment content as frequent flyers have gone through most of your new content. I have Celiac and a shellfish allergy and continue to have struggles with meals on business and first class flights. Please keep this in mind. Sorry - was a long travel day yesterday and a bit cranky this morning with my experience comments. Still an AA fan.

The business steward was absolutely amazing! Smiles and kindness! Wish all AA flights are like this one!

As a first class customer, there was no power the entire flight which limited my ability to work. I find this unacceptable. The first 11 rows on the left side of the plan were out. I was only offered the option to charge my phone which was not the issue because my laptop was out of power. I asked if there was anything that can be done for me, and the answer was, "no". I was not offered any type of compensation for this AA problem which caused me unnecessary stress due to inability to address business issues on an already challenging travel day. Flight attendants tried to reset the power once but that was the extent of their support. Very disappointing for the lack of expected services on a flight. Please contact me with customer focused response to this complaint.

Not really sure I enjoyed the flight at all. The flight attendants seemed a little tired and rude at times. The snacks were lacking in taste and sustenance. The flight was incredibly turbulent for three plus hours and the pilot had to do a second pass to land at our final destination because he was coming in so fast. He must have taken a short cut and because of it we had to suffer the violent turbulence and the dropping down. It had to be one of if not the worse flights I have ever been on and have traveled vastly all over the world.

Delay after delay with little communication then AA lost my luggage and at airport would not assist just said scan this QR code to track your luggage and submit a claim. However QR code provided did not work so have to go back to airport

After changing the departure gate 5 times making us mo e from one side of the airport to the other and then back the flight was delayed nearly 2 hours. The male flight attendant had a bad attitude with the guest being condescending, disrespectful with people who were already on edge.

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

Information on your arrival and departure airports