$518 Find Cheap Flights from St. Louis to South Korea

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 South Korea departing on 12/7. 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.
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1 adult, Economy, 0 bags

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Cheap Flights from St. Louis to South Korea

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Seoul
Incheon1 stop$846
Busan
Busan2 stops$1,236
Seoul
Incheon1 stop$846
Busan
Busan2 stops$1,236

Book Cheap St. Louis to South Korea 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 South Korea 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 South Korea

Sun, Dec 7 - Sun, Dec 14
American Airlines Logo
7:00 am - 4:45 pmSTL-ICN
18h 45m1 stop
American Airlines Logo
7:15 pm - 10:25 pmICN-STL
18h 10m1 stop
$846American Airlines
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Sun, Dec 7 - Sun, Dec 14
American Airlines Logo
7:00 am - 4:45 pmSTL-ICN
18h 45m1 stop
American Airlines Logo
7:15 pm - 11:38 pmICN-STL
19h 23m2 stops
$850American Airlines
Find Deal
Mon, Feb 23 - Sat, Feb 28
Delta Logo
5:54 pm - 4:50 pmSTL-ICN
31h 56m1 stop
Delta Logo
6:00 pm - 11:38 pmICN-STL
20h 38m1 stop
$851Delta
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Tue, Apr 14 - Mon, Apr 20
Alaska Airlines Logo
2:55 pm - 6:35 pmSTL-ICN
37h 40m1 stop
Alaska Airlines Logo
8:35 pm - 11:55 pmICN-STL
17h 20m1 stop
$853Alaska Airlines
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Fri, Apr 10 - Wed, Apr 15
United Airlines Logo
6:45 am - 3:00 pmSTL-ICN
18h 15m1 stop
United Airlines Logo
11:30 am - 6:22 pmICN-STL
20h 52m1 stop
$866United Airlines
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Fri, Apr 10 - Wed, Apr 15
United Airlines Logo
6:45 am - 3:00 pmSTL-ICN
18h 15m1 stop
United Airlines Logo
11:30 am - 8:45 pmICN-STL
23h 15m2 stops
$870United Airlines
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Thu, Mar 12 - Sun, Mar 22
Delta Logo
6:00 am - 3:50 pmSTL-ICN
19h 50m1 stop
Delta Logo
7:25 pm - 9:04 amICN-STL
27h 39m1 stop
$872Delta
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Fri, Mar 20 - Sun, Mar 29
Delta Logo
6:59 pm - 4:30 pmSTL-ICN
31h 31m2 stops
Delta Logo
4:25 pm - 10:50 amICN-STL
32h 25m1 stop
$876Delta
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Mon, Apr 13 - Tue, Apr 14
Korean Air Logo
6:00 am - 2:10 pmSTL-ICN
18h 10m1 stop
Korean Air Logo
6:50 pm - 11:38 pmICN-STL
18h 48m1 stop
$1,189Korean Air
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Fri, Apr 10 - Sat, Apr 18
Air Canada Logo
4:05 pm - 4:05 pmSTL-ICN
34h 00m2 stops
Air Canada Logo
5:45 pm - 3:24 pmICN-STL
35h 39m2 stops
$1,728Air Canada
Find Deal
Booking Insights

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

Get data-powered insights and trends into flights from St. Louis to South Korea 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 South Korea?

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

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

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

If your flying dates are flexible, you should consider flying to South Korea on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Friday is the most expensive day to fly from St. Louis to South Korea. For your return ticket, we recommend flying on a Thursday and avoiding Saturdays for the best deals.

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

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 South Korea, 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 South Korea, you should book around 2 weeks before departure, which saves you about 26% 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$518
Best time to beat the crowds but there is an average 6% increase in price.
Most popular time to fly with an average 33% increase in price.
Flight from St. Louis to Seoul Gimpo Intl

FAQs - booking South Korea flights

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

    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 South Korea.

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

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

    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 South Korea 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 South Korea?

    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 South Korea up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to South Korea?

    The cheapest time of day to fly to South Korea is generally in the evening, when round-trip flights cost $1,290 on average. Morning departures are around 20% more expensive than evening flights, on average. The most expensive time of day to fly to South Korea is generally at night, which is peak travel time and where the average cost of a ticket is $1,673.

Reviews of the top 5 airlines serving from St. Louis to South Korea

 
Need help choosing which airline to fly with from St. Louis to South Korea? 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 1162 reviews
8.2Entertainment
8.3Comfort
8.1Food
8.5Boarding
8.7Crew
Airline reviews

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

10.0 ExcellentVivian, Nov 2025SEA - ICN
Read more Korean Air reviews

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

Korean air has a little bit more seating space than Asiana air.

There was a lot of partial tv shows but not enough to last the flight. The food was incredible! The crew were so helpful and patient. Lots more space than what I usually get on an international flight. Very comfortable!

Flight delayed then cancelled. Misplaced luggage. Still do not have. Rented car 1100 mile drive. I had to buy some overnight Hotels clothes toiletries gas food at my expense. Still not home. Not sure where luggage is. Over 4 hours on hold to Felta

I truly love flying with Delta. They have always treated me with the upmost respect

Our flight attendant in FIRST CLASS was one of the worst I’ve ever had. She was not at all pleasant, nor particularly good at her service.

Everything went well and was good. Nothing exceptional, but no complaints either. Cheap seats are pretty comfortable.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

The aircraft interior is old and tired on this aircraft. The entertainment system never worked despite the crews attempt to reset the system.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Older aircraft, no meal, only food was for purchase. Not impressed United.

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

Always wish for more healthy, gluten free options. We have to bring our own.

Having a long layover, I was very appreciative of the ability to stand by for an earlier flight. Other airlines like Delta have refused this to me in the past, just to be mean (because my ticket class wasn't high enough). United went out of their way to help me get to my destination early, which I really appreciated given that it was the third leg of a 24+ hour journey for me.

Other than a way way too cold cabinets for the entire flight, all was great

One bag is incorrect and not acceptable for an international flight. The food was not just good. I won't fly with them again.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

My experience on this United Airlines flight was highly uncomfortable, primarily due to two issues: Cabin Temperature: The temperature on the Boeing 737 MAX 8 was unacceptably high, feeling consistently around 80 degrees throughout the flight. This made sleeping impossible and significantly detracted from the experience. Seating Arrangement: Being stuck in a middle seat for a six-and-a-half-hour overnight flight compounded the discomfort. Moving forward, I will always purchase a seat assignment to avoid this situation.

Premium Plus is a really good idea for longer flights

this plane was really old, had exit row seats and tray was in arm of seat so super uncomfortable to use. another seat they could t even use the tray it was broke. seat i. front of me had duct tape on it cause seat was ripped open... this plane should either be updated or retired.

We were very rushed by a staff member at the gate when transferring from American Airlines to Fijian. Then the plane stayed put for ages anyhow! The plane was delayed and my bag sent to San Francisco instead of Fiji

Baggage handling poor. Second time this has happened. My bag went to San Francisco instead of Fiji. No apology. Luckily Nadi airport staff are fantastic. My bag arrived in Fiji the next day.

We loved the steward on the plane. He made the night enjoyable

I enjoyed the extra leg room compared to other airlines. The first stewards made my daughter’s birthday special by giving her an extra snack. Then the last one coming home from Chicago to Appleton made our night really enjoyable Thanks for making our trip enjoyable

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

Flight delay was communicated before leaving for airport which caused it to be a non-event. Great flight and crew!

Did not get any refreshments. Crew was very nice but limited. Small seats

Wish some foods provided rather than just biscuit/cookie for flight more than 2 hours

Wish a flight with more than 2 hours with some snack rather than just cookie/biscuit.

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,

Plane left an hour late, I missed my connection and my bow case was never even loaded on the plane in VA. I deal with this type of nonsense everytime I fly air canada.

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

Information on your arrival and departure airports