$340 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 2/19. 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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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$746
Busan
Busan2 stops$1,116
Seoul
Incheon1 stop$746
Busan
Busan2 stops$1,116

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

Mon, Feb 2 - Fri, Feb 6
Delta Logo
6:10 am - 3:30 pmSTL-ICN
18h 20m1 stop
Delta Logo
7:25 pm - 11:37 pmICN-STL
19h 12m1 stop
$746Delta
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Mon, Feb 2 - Fri, Feb 6
Delta Logo
6:10 am - 3:30 pmSTL-ICN
18h 20m1 stop
Delta Logo
9:35 am - 5:50 pmICN-STL
23h 15m2 stops
$750Delta
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Thu, Dec 4 - Tue, Dec 9
United Airlines Logo
3:19 pm - 5:40 amSTL-ICN
23h 21m2 stops
United Airlines Logo
12:45 pm - 4:27 pmICN-STL
18h 42m1 stop
$846United Airlines
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Thu, Dec 4 - Tue, Dec 9
United Airlines Logo
3:19 pm - 5:40 amSTL-ICN
23h 21m2 stops
United Airlines Logo
12:45 pm - 8:57 pmICN-STL
23h 12m2 stops
$850United Airlines
Find Deal
Fri, Mar 20 - Sun, Mar 29
Alaska Airlines Logo
7:00 am - 6:35 pmSTL-ICN
21h 35m1 stop
Alaska Airlines Logo
8:35 pm - 2:11 pmICN-STL
31h 36m1 stop
$873Alaska Airlines
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Thu, Mar 12 - Sun, Mar 22
Delta Logo
7:05 pm - 5:00 amSTL-ICN
19h 55m1 stop
Delta Logo
7:40 pm - 12:37 amICN-STL
18h 57m1 stop
$906Delta
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Mon, Feb 16 - Mon, Mar 16
Japan Airlines Logo
2:19 pm - 10:55 amSTL-GMP
29h 36m2 stops
Japan Airlines Logo
12:05 pm - 11:09 pmGMP-STL
25h 04m2 stops
$1,010Japan Airlines
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Mon, Jan 5 - Mon, Jan 12
Japan Airlines Logo
2:06 pm - 6:20 pmSTL-GMP
37h 14m2 stops
Japan Airlines Logo
8:00 am - 11:59 pmGMP-STL
30h 59m2 stops
$1,515Japan Airlines
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Sat, Nov 29 - Mon, Dec 8
Multiple Airlines Logo
7:00 am - 10:05 pmSTL-GMP
24h 05m2 stops
Multiple Airlines Logo
8:00 am - 4:34 pmGMP-STL
23h 34m2 stops
$1,670Multiple Airlines
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Tue, Jan 6 - Tue, Jan 13
Multiple Airlines Logo
4:05 pm - 11:45 amSTL-PUS
28h 40m3 stops
Multiple Airlines Logo
5:50 pm - 1:55 pmPUS-STL
35h 05m2 stops
$5,807Multiple Airlines
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$340
Best time to beat the crowds but there is an average 6% increase in price.
Most popular time to fly with an average 32% increase in price.
Flight from St. Louis to Seoul Incheon Airport

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 1170 reviews
8.3Comfort
8.7Crew
8.1Food
8.5Boarding
8.2Entertainment
Airline reviews

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

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

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

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

Great. Seamless. Check in agent at kiosk international was amazing and extremely helpful.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

Service in business class was not impressive. I ordered coffee with dinner and then watched other people get 2 refills before I got my 1 cup of coffee, and only after I pressed the attendant button overhead. Furthermore, the seats in the forward cabin need maintenance on this 737-800: the upholstery is detaching from the seat frame, at least on the backs of seats 1C, 1D.

Plenty of leg room, temperature was great and staff was excellent. Would do it more often.

The ticket agents in West Palm Beach on Friday afternoon Nov. 7th were incredible in getting us on an earlier plane to Atlanta during the government shutdown. Had the taken our original flight we would have missed our connection. She did this on her own, We didn't even have to ask, and she did it all with a smile and showing genuine concern that we would be taken care of. We are very grateful and thankful. We fly often, and now we will be sure to fly Delta.

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.

This was an older airplane. The cabin was constantly warm to hot throughout the 10 hour flight and there were no vents to personalize air flow. Also since it was an older plane, the material and comfort of the chairs were very uncomfortable. I left my flight with major soreness on my tailbone.

Very thoughtful flight attendant offered me water immediately since I had run to make my connection.

Door to door, the crew and staff were amazing. It was a stressful travel day with delays, but they were focused on customers and doing what they could to get us to our destinations.

Even though we were delayed, we were able to make our connection

Seats in waiting area and on plane hard as rock. Fast internet on the flight was great! Crew was kind.

Starlink wifi on the Embraer E175 is an excellent experience. I was able to connect and work from IAD all the way to approach into BTV.

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.

We were told the flight was delayed 5 times, then it was moved to the next day.

More choices on snacks. Built-in video screen to enjoy entertainment choices.

we landed at cmh ten minutes early but had to sit on tarmac for twenty minutes because a plane was at our gate despite the fact that 3 other gates were open.

The experience with American Airlines was good, although the Philippines Airlines flight was much better (better seats, better food, better entertainment options, overall better). Again, the MIA to LAX flight was fine, but nothing in comparison to the comfort and accommodations of the Philippines Airlines flight from LAX to MNL.

I have a gluten allergy so did have any food

I have a gluten allergy so didn't have any food

Loved the crew . Absolutely no complaints. Except for luggage lost

Everything was good The connects, with no blame to crew. Or pilots. I understand they are short staffed. Everything went well for me. I'll be using you guys again in May if not sooner.

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

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 South Korea

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