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Flights from Seoul to St. Louis

Cheapest airlines flights from Seoul to St. Louis

You can choose from 2 airlines that fly from Seoul to St. Louis, including Asiana Airlines, Delta Air Lines, Alaska Airlines has lowest fares on this route.
Asiana Airlines logo Asiana Airlines
Delta Air Lines logo Delta Air Lines
Airlines are determined based on actual purchased flight tickets from Seoul to St. Louis according to previous 12 months data from Trip.com.

Search cheap flights from Seoul to St. Louis in the next 3 months. Based on Trip.com's latest 7-day data, one-way fares start at US$768, and round-trip tickets start at US$1,442.

      • ICN 19:20
        19h 19m
        1 stop
        STL 00:39
        Seoul - St. Louis | Tue, Jun 23 | Delta Air Lines
        STL 08:00
        17h 20m
        1 stop
        ICN 15:20
        St. Louis - Seoul | Tue, Jun 30 | Delta Air Lines
        US$1,442 US$2,305
        37% off
        37% off
        US$2,305 US$1,442
      • ICN 19:20
        19h 19m
        1 stop
        STL 00:39
        Seoul - St. Louis | Wed, Jun 24 | Delta Air Lines
        STL 08:00
        17h 20m
        1 stop
        ICN 15:20
        St. Louis - Seoul | Tue, Jun 30 | Delta Air Lines
        US$1,442 US$2,305
        37% off
        37% off
        US$2,305 US$1,442
      • ICN 19:20
        19h 17m
        1 stop
        STL 00:37
        Seoul - St. Louis | Tue, Jul 7 | Delta Air Lines
        STL 15:57
        35h 23m
        1 stop
        ICN 17:20
        St. Louis - Seoul | Sat, Jul 11 | Delta Air Lines
        US$1,465 US$2,305
        36% off
        36% off
        US$2,305 US$1,465
      • ICN 21:00
        16h 59m
        1 stop
        STL 23:59
        Seoul - St. Louis | Tue, Jul 7 | Asiana Airlines
        STL 19:23
        19h 12m
        1 stop
        ICN 04:35
        St. Louis - Seoul | Sat, Jul 11 | Asiana Airlines
        US$1,559
        32% off
        US$2,305 US$1,559
      • ICN 21:20
        35h 37m
        1 stop
        STL 18:57
        Seoul - St. Louis | Tue, Jun 23 | Asiana Airlines
        STL 06:01
        32h 24m
        1 stop
        ICN 04:25
        St. Louis - Seoul | Tue, Jun 30 | United Airlines
        US$1,568
        32% off
        US$2,305 US$1,568
      • ICN 21:00
        30h 52m
        1 stop
        STL 13:52
        Seoul - St. Louis | Mon, Jul 6 | Asiana Airlines
        STL 19:23
        19h 12m
        1 stop
        ICN 04:35
        St. Louis - Seoul | Sat, Jul 11 | Asiana Airlines
        US$1,573
        32% off
        US$2,305 US$1,573
      • ICN 19:20
        19h 19m
        1 stop
        STL 00:39
        Seoul - St. Louis | Tue, Jun 23 | Korean Air
        STL 17:42
        33h 38m
        1 stop
        ICN 17:20
        St. Louis - Seoul | Tue, Jun 30 | Delta Air Lines
        US$1,584
        31% off
        US$2,305 US$1,584
      • ICN 19:00
        18h 59m
        1 stop
        STL 23:59
        Seoul - St. Louis | Wed, Jun 24 | Korean Air
        STL 14:28
        34h 52m
        1 stop
        ICN 15:20
        St. Louis - Seoul | Tue, Jun 30 | Delta Air Lines
        US$1,584
        31% off
        US$2,305 US$1,584
      • ICN 17:50
        20h 6m
        1 stop
        STL 23:56
        Seoul - St. Louis | Sat, Jul 4 | American Airlines
        STL 08:25
        17h 20m
        1 stop
        ICN 15:45
        St. Louis - Seoul | Sat, Jul 11 | American Airlines
        US$1,604
        30% off
        US$2,305 US$1,604
      • ICN 21:00
        32h 46m
        1 stop
        STL 15:46
        Seoul - St. Louis | Wed, Jun 24 | Asiana Airlines
        STL 06:01
        32h 24m
        1 stop
        ICN 04:25
        St. Louis - Seoul | Tue, Jun 30 | United Airlines
        US$1,636
        28% off
        US$2,305 US$1,636
      • SEL 13:00
        17h 25m
        1 stop
        STL 14:00
        Seoul - St. Louis | Mon, Jun 15 | Normal Airline
        STL 15:00
        6h
        Nonstop
        SEL 16:00
        St. Louis - Seoul | Wed, Jun 17 | Normal Airline
        Find more flights
        Find more flights
      • ICN 19:35
        18h 24m
        1 stop
        STL 23:59
        Seoul - St. Louis | Sat, Jun 27 | Alaska Airlines
        US$768 US$1,284
        40% off
        40% off
        US$1,284 US$768
      • ICN 19:35
        18h 24m
        1 stop
        STL 23:59
        Seoul - St. Louis | Thu, Jun 25 | Alaska Airlines
        US$797 US$1,284
        38% off
        38% off
        US$1,284 US$797
      • ICN 19:35
        18h 24m
        1 stop
        STL 23:59
        Seoul - St. Louis | Thu, Jun 18 | Alaska Airlines
        US$804 US$1,284
        37% off
        37% off
        US$1,284 US$804
      • ICN 19:35
        18h 24m
        1 stop
        STL 23:59
        Seoul - St. Louis | Sat, Jun 20 | Alaska Airlines
        US$806
        37% off
        US$1,284 US$806
      • ICN 19:35
        18h 24m
        1 stop
        STL 23:59
        Seoul - St. Louis | Fri, Jun 26 | Alaska Airlines
        US$807
        37% off
        US$1,284 US$807
      • ICN 19:35
        18h 24m
        1 stop
        STL 23:59
        Seoul - St. Louis | Mon, Jun 29 | Alaska Airlines
        US$845
        34% off
        US$1,284 US$845
      • ICN 21:05
        25h 4m
        1 stop
        STL 08:09
        Seoul - St. Louis | Mon, Jun 22 | Asiana Airlines
        US$855
        33% off
        US$1,284 US$855
      • ICN 19:35
        18h 24m
        1 stop
        STL 23:59
        Seoul - St. Louis | Fri, Jun 19 | Alaska Airlines
        US$870
        32% off
        US$1,284 US$870
      • ICN 19:35
        18h 24m
        1 stop
        STL 23:59
        Seoul - St. Louis | Mon, Jun 15 | Alaska Airlines
        US$909
        28% off
        US$1,284 US$909
      • ICN 17:50
        20h 9m
        1 stop
        STL 23:59
        Seoul - St. Louis | Tue, Jun 23 | American Airlines
        US$911
        28% off
        US$1,284 US$911
      • SEL 13:00
        17h 25m
        1 stop
        STL 14:00
        Seoul - St. Louis | Mon, Jun 15 | Normal Airline
        Find more flights
        Find more flights

Displayed flight fares from Seoul to St. Louis are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Seoul to St. Louis Flight Details

The distance between Seoul and St. Louis is about 10,736.12 km. Based on Trip.com's latest data, travel demand is highest in July. The off-season for travel is October.

Cheapest one-way flight priceUS$768
Cheapest return ticket priceUS$1,442
Cheapest monthOctober
Peak season for travelJuly
Flight distance10,736.12 km
Popular airlineAsiana Airlines
Flight statistics for the Seoul–St. Louis route are based on aggregated booking data from Trip.com over the past 12 months.

Trip.com Price Insights on Flights from Seoul to St. Louis

Which month has the cheapest round-trip flights from Seoul to St. Louis?

The average price of round-trip flights from Seoul to St. Louis purchased by Trip.com users by month over the past 12 months.

Based on data from Trip.com, the lowest prices for round-trip flights from Seoul to St. Louis are found during February, with an average price of US$904. Conversely, the highest prices are found during January, with an average price of up to US$1,895.

US$1,895
US$1,400
US$904
US$409
    Cheapest
  • US$1,274
    Jun
  • US$1,366
    Jul
  • US$1,362
    Aug
  • US$1,115
    Sep
  • US$1,578
    Oct
  • US$999
    Nov
  • US$972
    Dec
  • US$1,895
    Jan
  • US$904
    Feb
  • US$1,126
    Mar
  • US$989
    Apr
  • US$1,119
    May

Frequently Asked Questions

  • What are the cheapest flights from Seoul to St. Louis (SEL-STL)?

    Based on Trip.com data, Alaska Airlines offers one-way fares as low as US$768 on Cheapest nonstop routes (e.g. ICN to STL on Sat, Jun 27), while Delta Air Lines offers Cheapest nonstop round-trips from US$1,442 departing on Tue, Jun 23 and returning on Tue, Jun 30.
  • At the moment, several airlines serve connecting flights from Seoul to St. Louis, including: Asiana Airlines Delta Air Lines Selected airlines are based on historical data collected from flight bookings made by users on Trip.com within the last 90 days.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seoul to St. Louis is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Seoul to St. Louis, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sat, Jun 27, with one-way flights priced at just US$768.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Alaska Airlines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for St. Louis travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Seoul to St. Louis is October, when demand for travel is lower.
  • After crunching the numbers on our June flight calendar, it's currently cheapest to fly from Seoul to St. Louis on June 15, 2026 with Asiana Airlines, with prices starting at US$1,407.
  • You can land at any one of the following hubs in St. Louis, with Incheon International Airport to St. Louis Lambert International Airport (ICN-STL) is by far the most common option on this route: St. Louis Downtown Airport (CPS) St. Louis Lambert International Airport (STL).
  • The time difference between St. Louis and Seoul is 15h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

Trip.com Airline Insights on Flights from Seoul to St. Louis

Which airline offers the cheapest direct flights from Seoul to St. Louis?

Data is based on the average price of all nonstop flights from Seoul to St. Louis on Trip.com over the past 12 months.

Based on Trip.com’s data from the past 12 months, United Airlines provides the lowest-priced direct flights from Seoul to St. Louis, with fares starting at US$936.

US$786
US$936
US$1,086
US$1,236
US$1,386
United Airlines
US$936
United Airlines
Alaska Airlines
US$947
Alaska Airlines
Asiana Airlines
US$964
Asiana Airlines
American Airlines
US$979
American Airlines
Delta Air Lines
US$1,171
Delta Air Lines
Korean Air
US$1,386
Korean Air

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Note: Prices shown on this page are the estimated lowest prices found in the last 24 hours and include all taxes and fees.

Book with no extra fees

Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are clearly shown before you pay. Charges for checked baggage, onboard meals, Wi‑Fi, and other optional services are also included where applicable in the flight cards.

Real-time pricing updates

Prices, availability, and travel details on this page have been updated within the last 24 hours, and for many routes are refreshed in real time. The more popular the route, the more accurate and up-to-date the data.

Change & Cancellation Policy

Trip.com shows the change and cancellation rules for each ticket during the booking process, including all related fees and conditions. Please refer to the following scenarios:
Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply based on the airline’s fare rules.
Cancellation/change due to a flight schedule change:
If your flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For full details of change and cancellation policies, please refer to the customer support pages.