STL - SEL

$448 Find Cheap Flights from St. Louis to Seoul

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 Seoul departing on 3/17. 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 Seoul

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Seoul, 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 Seoul, 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
$746
Typical prices: $799-$1,307
Delta
Tue 1/13Tue 1/20
STL - ICN • 1 stop
Cheapest one-way
$448
Typical prices: $1,889-$3,795
United Airlines
Tue 3/17
STL - ICN • 2 stops
Top airlines
Delta
Cheapest • from $746 (round-trip)
Korean Air
Best reviews • 8.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 24% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
October
Cheapest • 23% price drop
June
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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 Seoul!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to Seoul (STL-SEL)

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

Tue, Jan 13 - Tue, Jan 20
Delta Logo
6:10 am - 3:30 pm
STL
-
ICN
18h 20m1 stop
Delta Logo
9:35 am - 4:37 pm
ICN
-
STL
22h 02m1 stop
$746Delta
Tue, Jan 13 - Tue, Jan 20
Delta Logo
6:10 am - 4:30 pm
STL
-
ICN
19h 20m2 stops
Delta Logo
7:30 pm - 11:25 pm
ICN
-
STL
18h 55m1 stop
$750Delta
Sat, Jan 31 - Mon, Feb 9
Multiple Airlines Logo
6:19 pm - 6:35 pm
STL
-
ICN
33h 16m1 stop
Multiple Airlines Logo
8:35 pm - 1:54 pm
ICN
-
STL
32h 19m1 stop
$758Multiple Airlines
Sun, Feb 15 - Thu, Feb 19
United Airlines Logo
5:25 pm - 5:40 am
STL
-
ICN
21h 15m1 stop
United Airlines Logo
12:45 pm - 4:44 pm
ICN
-
STL
18h 59m1 stop
$846United Airlines
Sun, Feb 15 - Thu, Feb 19
United Airlines Logo
5:25 pm - 5:40 am
STL
-
ICN
21h 15m1 stop
United Airlines Logo
12:45 pm - 8:26 pm
ICN
-
STL
22h 41m2 stops
$850United Airlines
Thu, Jan 1 - Thu, Jan 15
United Airlines Logo
6:41 am - 5:40 am
STL
-
ICN
31h 59m1 stop
United Airlines Logo
6:00 pm - 5:11 am
ICN
-
STL
26h 11m1 stop
$853United Airlines
Sat, Jan 31 - Mon, Feb 9
Japan Airlines Logo
7:04 am - 10:55 am
STL
-
GMP
36h 51m2 stops
Japan Airlines Logo
8:00 am - 11:59 pm
GMP
-
STL
30h 59m2 stops
$866Japan Airlines
Wed, Jan 28 - Wed, Feb 4
United Airlines Logo
5:00 pm - 5:40 am
STL
-
ICN
21h 40m1 stop
United Airlines Logo
12:45 pm - 3:37 pm
ICN
-
STL
17h 52m1 stop
$866United Airlines
Wed, Jan 21 - Sun, Jan 25
Japan Airlines Logo
7:04 am - 10:55 am
STL
-
GMP
36h 51m2 stops
Japan Airlines Logo
7:40 pm - 11:59 pm
GMP
-
STL
43h 19m2 stops
$890Japan Airlines
Sat, Dec 20 - Sat, Dec 27
Multiple Airlines Logo
4:05 pm - 11:20 am
STL
-
GMP
52h 15m2 stops
Multiple Airlines Logo
7:40 pm - 11:51 pm
GMP
-
STL
43h 11m2 stops
$3,412Multiple Airlines
Booking Insights

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

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

What’s the cheapest day of the week to fly from St. Louis to Seoul?

The average price of all round-trip flights from St. Louis to Seoul clicked on KAYAK for each day over the last 12 months.

When flying from St. Louis to Seoul, you should consider leaving on a Wednesday and avoid Fridays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Thursdays and the most expensive ones on Saturdays.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Seoul, 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 Seoul is October, where tickets cost $866 (return) on average. On the other hand, the most expensive months are August and July, where the average cost of round-trip tickets is $1,491 and $1,420 respectively.

How far in advance should I book a flight from St. Louis to Seoul?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Seoul, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to Seoul, you should book around 2 weeks before departure, which saves you about 24% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 20 weeks before departure.

Good to know

Low seasonAugust
Cheapest flight$448
Best time to beat the crowds but there is an average 33% increase in price.
Most popular time to fly with an average 25% increase in price.
Flight from St. Louis to Seoul Incheon Airport

When to book flights from St. Louis to Seoul

Are your dates flexible? Find out the best times to travel from St. Louis to Seoul 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 Seoul

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

    In the last 3 days, the lowest price for a flight from St. Louis to Seoul was $448 for a one-way ticket and $746 for a round-trip.

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

    Yes, you'll most likely have to show a valid passport before boarding the plane in St. Louis and on arrival in Seoul.

  • Which airports will I be using when flying from St. Louis to Seoul?

    On your way to Seoul, you’ll fly out from Lambert-St Louis. You’ll be landing in one of Seoul’s 2 airports: Seoul Gimpo Intl or Incheon Intl.

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

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

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

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between St. Louis and Seoul, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from St. Louis to Seoul, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Seoul are Delta and United Airlines. With an average price for the route of $1,041 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $1,509 and an overall rating of 7.4.

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

    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 Seoul.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seoul 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 Seoul?

    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 Seoul with an airline and back to St. Louis with another airline.

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

    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 Seoul 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 5 airlines serving from St. Louis to Seoul

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Seoul. 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 Seoul? 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.
8.4
Korean AirOverall score based on 1186 reviews
8.1Food
8.3Comfort
8.7Crew
8.5Boarding
8.2Entertainment
Airline reviews

Never had a flight delay issue with Korean Air, that's why I always go with this airline.

10.0 ExcellentOmer, Nov 2025
MNL - ICN
Read more Korean Air reviews

Never had a flight delay issue with Korean Air, that's why I always go with this airline.

Flight crew were very attentive and made this trip a pleasure. Plus the fact that this our first time flying business class.

The boarding process was efficient and quick. The seats were comfortable. The food was good. The service was excellent. We had a lovely flight from Seattle on Korean air

Flight crew was fantastic. The aircraft was meticulously cleaned at all times. The crew was continuously checking to see if the passengers were ok.

Korean are so racist and when I ask question or directions they totally ignore me and say racist. Also they give me an rude attitude.

It was good, I liked the self-serve snacks but it was a little difficult to get the alcohol, which is understandable since I wouldn't want kids sneaking it.

Friendly flight attendants and gate agents. Very clean plane and food was good!

I normally love Korean Air, but this trip was not great. We boarded the plan and were settling into our seats. My son and I use these leg swings and we used it on the trip over to Cambodia, but on the way back the flight attendant very rudely told us we could not use it and that it was against regulations. I asked to see the regulation, but never saw it. The food on this trip was horrible as well, Even my son's kids meal was disgusting so we didn't eat anything on the flight. Thankfully we brought snacks. Entertainment - what happened to the games?

This was an amazing flight. The crew was great. The service was great. The food provided was great.

I was unable to select decent seats, and so I was stuck in the middle seat because it was selected for me

I noticed that the planes seem to be outdated. There was no entertainment per se. Also, the waiting area did not have any working electrical outlets

None of the airplane features were available during the flight.

Original flight was cancelled and when i was rebooked by the airline, they couldn't seat me in the same type of seat as I had originally booked (went from window/aisle to middle/middle and one was a bulkhead seat, and other wasn't in the same class)

Lady Pilot was perfect in every way wheels up to wheels down communication, professionalism, excellent on time departure and on time arrival, excellent communication! Fantastic job with Superb attitude!!

The food is terrible. The staff is wonderful. Comfort is good.

Left on time, a bit delayed due to headwinds most of the trip.

I fly Delta all the time, have Platinum Medallion status. But this route seems to have major problems with delays and seems to never leave on time! Have only taken it twice in the last two weeks, and each time it had delays of more than 1 hour... very disappointed!!!!

Getting to the flight was arduous and lengthy. The flight itself was good but the food option wasn’t a good selection. I need to do a Kosher option on my return. Flight crew were nice

Good seats in Main cabin, excellent service and excellent landing

My flight was cancelled with no explanation after I had already cleared security. I was given 4 options to rebook, only one being non-stop like I had paid for. I grabbed it. It was 4 plus hours later and then took off even later. Biggest complaint is that I booked early and had an aisle seat. They gave me a "window" seat in front of the exit row, so the seat did not decline. I weigh all of 103 #s and it was tight for me! For what I paid, I feel I was kind of ripped off. I think they should have given me the empty comfort seat for the inconvenience. There was no apology nor any explanation as to why the flight was cancelled. My guess is it benefitted Delta in some way.

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Not great experience - we were super late boarding due to issues with aircraft. Then when we finally all got onboard and seated and they started taxiing out to the runway they just stopped then turned around and went back to the airport. Apparently the crew “ran out of time” to legally fly us. They mentioned that they were about 2 minutes away from taking off. I understand the rules and safety but kinda wonder why they would have bothered boarding us in the first place? Had to go all the way back and de plane and then wait in a HUGE line to get a hotel (this is somewhere around 2:30am) finally got to hotel by Uber (no shuttle after 20min so gave up) and they ended up putting us all back on the same aircraft at 10am next morning so got about 2.5 hours sleep. They did give us. $250 credit, but it was a São Paulo Brazil flight out of Dulles. The flight and everything was fine.

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

United have really come back. Airport and boarding process is clear and good, app and information also very good

They charged a fee for 1st bag checked. Others in same party were free.

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

The movies offered were great. Staff were very pleasant and very efficient.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very bad! They kept delaying my flight and wouldn’t do anything about it

Gate was overcrowded. Gate agents performed very well. Flight crew was top notch! Efficient & professional & courteous. Both meals not thermalized well. Dinner main dish was actually cold in the center. Almost inedible. Breakfast sandwich was lukewarm.

The boarding was as always, the crew tried their best but not enough. The food was a disaster I had dietary restrictions that were half met because the company did not loaded the food for the flight. The entertainment screen was fine but content was not and also they removed the free messaging option from the flight and they charged 30 dollars for that crappy bandwidth. This flight is not worth the cost and the company is going down on quality.

Not comparable to Qatar Airways services on flights to Doha. Flight attendants provided basic services; I was never recognized by name or as an Executive Platinum member. Restrooms were not kept clean during the flight.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

it was fine, decent flight... dont get food besides cookies or pretzels so not sure why you ask about food. same for entertainment..

I got sick nothing contagious but distressing and the care I received by Kayla? Keighly the flight attendant will be memorable for ever. Thank You

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

Waaay too small plane. They also need to up the size of the overhead bins. I would love to keep me 3k with of camera equipment in my hard case baggahe instead of it being thrown into the belly of the plane

Attendants were pleasant and the flight was smooth and relaxed.

A little late at the start but all worked out well.

It was just fine. I managed to make all my connection too sbut had trouble in Munich with no wheel chair and trouble trying to get help from the airport people to get to the other terminal for my flight. Finally a wonderful lady Amelia, helped me to make my flight connection Timon with zero time to spare.

Over 40 years ago my AC return flight was canceled, during this last summer the same thing happened. AC denied everything Canadian like paying for accommodations and basic necessities. So why would I ever want to fly AC again? This last flight my wife took the return flight had problems and left late, so I guess they are getting better. However I have no faith in this airline so I drove to this last destination! I'll never fly AC again!!!

Great check in process in LA and good service The check in process as well as at the gate is way better in the US versus canada 🇨🇦

Super experience. Earlier than schedule departure and arrival. Baggage handling was very good

Allow me to book extra bag check in as free though I packed in 1 luggage but that was 7 LBS overweight so make another bag to free check in.

I would like to get my money back. I flight was 4 hours late on the way to detroit, And same on my way back to Brussels they cancelled my flight and give me an other ticket and i had to wait 5 hours.

All attendents were very efficient, pleasant and happy. Everything went smoothly. The seats could have been wider. There could have been more free food instead of just one small bar.

My seat was one of those that couldn't recline, but the problem was that it was abnormally upright, so the headrest actually made the seat concave, which was uncomfortable and hard on my lower back. I had to ball my jacket up and use it as lumbar support. goodness I had it with me.

Boarding was so so after zone 3 was called all other zones went in

I liked a lot , the flight attendant so nice ,the seat very comfortable I enjoyed the flight , I will do it again with Air Canada,

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

Information on your arrival and departure airports