Are direct flights from St. Louis to Seoul always the best option?

Direct flights offer convenience and save time, but they are not always the most budget-friendly choice. Flights with one or more layovers can often be cheaper. Consider your priorities for cost versus travel time when making your decision.

Can flexible travel dates help on St. Louis to Seoul flights?

Yes, being flexible with your travel dates can significantly impact flight prices. Flying on weekdays or during off-peak seasons may lead to lower fares. Adjusting your departure or return by a few days can often reveal more affordable options.

What extra costs should I check before booking St. Louis to Seoul flights?

Before booking, always check for potential extra costs such as baggage fees, seat selection charges, and in-flight services. Some airlines may also charge for printing boarding passes at the airport. Factor these into your total travel budget.

Flights From St. Louis

To Seoul

Cheap Flights from St. Louis to Seoul

Browse current best options from St. Louis. Become a member to unlock all deals and get alerts when new deals appear.

Deals from

St. Louis

RatePunk searches hundreds of travel sites at once for deals on flights to Seoul

Prices updated 1 day ago

461 airlines compared

80%+ AI score for best value

Fares are subject to change and may not be available for all dates. (Data last updated Sep 14, 2026.)

Today’s best flight deals from St. Louis to Seoul

Explore current cheapest deals departing from St. Louis to Seoul

2026-10-21 – 2026-10-27
STL - Seoul
76% AI deal score
$1,040
$1,012
Round trip
2026-10-23 – 2026-10-27
STL - Seoul
77% AI deal score
$1,089
$1,020
Round trip
2026-10-16 – 2026-10-27
STL - Seoul
75% AI deal score
$1,001
$1,022
Round trip
2026-10-21 – 2026-10-28
STL - Seoul
75% AI deal score
$1,041
$1,032
Round trip
2026-10-23 – 2026-10-28
STL - Seoul
75% AI deal score
$1,068
$1,040
Round trip
2026-10-16 – 2026-10-28
STL - Seoul
74% AI deal score
$993
$1,041
Round trip
2026-10-16 – 2026-10-21
STL - Seoul
75% AI deal score
$1,070
$1,057
Round trip
2026-09-23 – 2026-10-01
STL - Seoul
76% AI deal score
$815
$1,064
Round trip
2026-10-24 – 2026-10-27
STL - Seoul
76% AI deal score
$1,090
$1,068
Round trip
2026-09-20 – 2026-10-05
STL - Seoul
76% AI deal score
$817
$1,071
Round trip

St. Louis to Seoul: Overview

Insights for flights from St. Louis to Seoul

Right now, only 6% of recent fares from St. Louis to Seoul are classified as a good price. Fares for this route typically range from $1267–$1420, with a median of $1321. Current fares are significantly below the typical level, suggesting a favorable time to look for cheap flights from St. Louis to Seoul. New deals for this route appear almost daily, offering frequent opportunities to find competitive prices.

If you are looking for the cheapest time to fly from St. Louis to Seoul, January stands out with a median fare of $369. Following closely, December offers a median fare of $485, and March presents another economical option with a median fare of $527. These months typically offer more budget-friendly travel options compared to other times of the year.

A typical journey from St. Louis to Seoul takes approximately 38h 54m, including connections. This is a long-haul route, and most itineraries connect at least once. In fact, 0% of recent fares from St. Louis to Seoul were for non-stop flights, indicating that travelers should expect to make connections. When connecting, the median number of stopovers is 2, which contributes to the overall journey time.

The distance between St. Louis and Seoul is approximately 10740 kilometers, classifying this as a long-haul route. This considerable distance means that all flights will involve a substantial amount of travel time. Travelers should plan accordingly for a journey that spans across continents.

How much is a round trip from St. Louis to Seoul

Regular price: $844 - $1,629

Prices for flights from St. Louis to Seoul are currently within the regular range.

Regular prices for flights from St. Louis to Seoul typically range from $844 to $1629. The current lowest deal is $947 with Frontier Airlines for travel from Nov 4-Nov 9.

now $947

Low $844

High $1,629

The cheapest time to fly from St. Louis to Seoul

The cheapest month to fly from St. Louis to Seoul is January, with a median price of $369. The most expensive month is September, with a median price of $1420. Prices are generally lower from January to December.

January

Cheapest

Flights from $369

September

Most Expensive

Flights from $1,420

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from St. Louis to Seoul

Air Canada

United Airlines

T'way Air

Frontier Airlines

Last-minute flights going from St. Louis to Seoul

Tue, Sep 15

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

American Airlines

$831

$1,079

One-way

Wed, Sep 16

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

Deutsche Luft Hansa

$831

$1,080

One-way

Wed, Sep 16

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

Deutsche Luft Hansa

$836

$1,125

One-way

Wed, Sep 16

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

United Airlines

$818

$1,187

One-way

Thu, Sep 17

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

United Airlines

$813

$1,187

One-way

Fri, Sep 18

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

American Airlines

$884

$1,163

One-way

Biggest price drops on these dates for flights from St. Louis to Seoul

5 nights

Oct 21 - Oct 26

$1,070 → $1,019

4 nights

Oct 23 - Oct 27

$1,089 → $1,042

6 nights

Oct 21 - Oct 27

$1,040 → $1,025

3 nights

Oct 24 - Oct 27

$1,091 → $1,076

Popular Airports to fly from St. Louis to Seoul

St. Louis - Seoul route insights

💸 Price insights

Recent fares are below the typical level.

Recent fares from St. Louis to Seoul are below the typical level, with a median of $1321.

📅 Best time to fly

January is historically the cheapest month to fly.

Historically, January offers the lowest median price at $369 for flights from St. Louis to Seoul.

⏱️ Flight duration

Flights typically take 38h 54m.

The median flight duration from St. Louis to Seoul is 38 hours and 54 minutes, with 2 stopovers.

✈️ Airlines & availability

Connecting flights are dominant for this route.

Connecting flights are dominant for this route, with a median of 2 stopovers.

🏆 Airline highlight

Frontier Airlines had a recent deal for $947.

Frontier Airlines offered a recent deal from St. Louis to Seoul for $947 via kiwi.

🎯 Booking tip

Deals are frequent for this route.

Deals for flights from St. Louis to Seoul are frequent, appearing within a 30-day window.

St. Louis main airports to depart from

St. Louis Lambert International (STL)

Cheapest

St. Louis Lambert International is a good option for flights from St. Louis to Seoul.

📍 ~20 km from St. Louis (reachable by car or train)

💸 Flights from ~$999

Seoul main airports to arrive at

Incheon International (ICN)

Cheapest

Incheon International Airport is a major hub for international flights to Seoul, South Korea.

📍 ~48 km from Seoul city center (reachable by car)

💸 Flights from ~$997

Airports nearby Seoul used as alternative

Cheongju International (CJJ)

Cheongju International is a useful alternative, serving as a primary low-cost carrier hub for regional international routes.

📍 ~110 km from Seoul (reachable by bus and rail)

💸 Flights from ~$1,173

Business & First Class Flight Deals to Seoul

Discover luxury on the budget with premium cabin class on flights from St. Louis to Seoul.

Elite

Best Elite deals to Seoul

Exclusive daily First Class, Business Class, and Premium Economy flight deals, refreshed every 24 hours.

From STL

Elite

Oct 24

Seoul, South Korea

90% AI deal score

$6,507

$4,632

Save $1,875

Alaska Airlines, Inc., +1

Business Class

From STL

Elite

Nov 08

Seoul, South Korea

89% AI deal score

$5,879

$4,556

Save $1,323

Alaska Airlines, Inc., +1

Business Class

From STL

Elite

Oct 27

Seoul, South Korea

89% AI deal score

$6,082

$4,636

Save $1,446

Alaska Airlines, Inc., +1

Business Class

From STL

Elite

Oct 27

Seoul, South Korea

89% AI deal score

$6,401

$4,822

Save $1,579

Alaska Airlines, Inc., +1

Business Class

From STL

Elite

Nov 11

Seoul, South Korea

88% AI deal score

$5,904

$4,619

Save $1,285

Air Canada, +1

Business Class

From STL

Elite

Nov 11

Seoul, South Korea

88% AI deal score

$6,138

$4,805

Save $1,333

Air Canada, +1

Business Class

From STL

Elite

Oct 27

Seoul, South Korea

88% AI deal score

$6,295

$4,822

Save $1,473

Alaska Airlines, Inc., +1

Business Class

From STL

Elite

Oct 24

Seoul, South Korea

88% AI deal score

$6,295

$4,824

Save $1,471

Alaska Airlines, Inc., +1

Business Class

From STL

Elite

Oct 29

Seoul, South Korea

88% AI deal score

$6,501

$4,976

Save $1,525

Alaska Airlines, Inc., +1

Business Class

From STL

Elite

Nov 03

Seoul, South Korea

84% AI deal score

$5,776

$4,636

Save $1,140

Alaska Airlines, Inc., +1

Business Class

From STL

Elite

Nov 08

Seoul, South Korea

84% AI deal score

$5,993

$4,742

Save $1,251

Alaska Airlines, Inc., +1

Business Class

From STL

Elite

Oct 27

Seoul, South Korea

84% AI deal score

$6,251

$4,822

Save $1,429

Alaska Airlines, Inc., +1

Business Class

Frequently Asked Questions About Flights to Seoul

To find more affordable flights, consider being flexible with your travel dates and times. Comparing prices across different airlines and booking sites can also help uncover better deals. Look out for layovers, as these may sometimes reduce the overall ticket cost.

Booking flights in advance often provides more options and potentially better prices, especially for international routes. However, last-minute deals can sometimes appear. It's usually beneficial to monitor prices over a period to identify trends.

Comparing nearby airports at both your origin and destination can sometimes reveal more economical flight options. While it may involve additional ground transportation, the savings on airfare could be significant. Always factor in the total travel time and cost.

St. Louis to Seoul: Overview

Insights for flights from St. Louis to Seoul

How much is a round trip from St. Louis to Seoul

Regular price: $844 - $1,629

Prices for flights from St. Louis to Seoul are currently within the regular range.

Regular prices for flights from St. Louis to Seoul typically range from $844 to $1629. The current lowest deal is $947 with Frontier Airlines for travel from Nov 4-Nov 9.

now $947

Low $844

High $1,629

The cheapest time to fly from St. Louis to Seoul

January

Cheapest

Flights from $369

September

Most Expensive

Flights from $1,420

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from St. Louis to Seoul

Air Canada

United Airlines

T'way Air

Frontier Airlines

Last-minute flights going from St. Louis to Seoul

Tue, Sep 15

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

American Airlines

$831

$1,079

One-way

Wed, Sep 16

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

Deutsche Luft Hansa

$831

$1,080

One-way

Wed, Sep 16

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

Deutsche Luft Hansa

$836

$1,125

One-way

Wed, Sep 16

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

United Airlines

$818

$1,187

One-way

Thu, Sep 17

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

United Airlines

$813

$1,187

One-way

Fri, Sep 18

⌛ Last-Minute

STL - Seoul

St. Louis (STL) - Seoul (ICN)

American Airlines

$884

$1,163

One-way

Biggest price drops on these dates for flights from St. Louis to Seoul

5 nights

Oct 21 - Oct 26

$1,070 → $1,019

4 nights

Oct 23 - Oct 27

$1,089 → $1,042

6 nights

Oct 21 - Oct 27

$1,040 → $1,025

3 nights

Oct 24 - Oct 27

$1,091 → $1,076

Popular Airports to fly from St. Louis to Seoul

St. Louis - Seoul route insights

💸 Price insights

Recent fares are below the typical level.

Recent fares from St. Louis to Seoul are below the typical level, with a median of $1321.

📅 Best time to fly

January is historically the cheapest month to fly.

Historically, January offers the lowest median price at $369 for flights from St. Louis to Seoul.

⏱️ Flight duration

Flights typically take 38h 54m.

The median flight duration from St. Louis to Seoul is 38 hours and 54 minutes, with 2 stopovers.

✈️ Airlines & availability

Connecting flights are dominant for this route.

Connecting flights are dominant for this route, with a median of 2 stopovers.

🏆 Airline highlight

Frontier Airlines had a recent deal for $947.

Frontier Airlines offered a recent deal from St. Louis to Seoul for $947 via kiwi.

🎯 Booking tip

Deals are frequent for this route.

Deals for flights from St. Louis to Seoul are frequent, appearing within a 30-day window.

St. Louis main airports to depart from

St. Louis Lambert International (STL)

Cheapest

St. Louis Lambert International is a good option for flights from St. Louis to Seoul.

📍 ~20 km from St. Louis (reachable by car or train)

💸 Flights from ~$999

Seoul main airports to arrive at

Incheon International (ICN)

Cheapest

Incheon International Airport is a major hub for international flights to Seoul, South Korea.

📍 ~48 km from Seoul city center (reachable by car)

💸 Flights from ~$997

Airports nearby Seoul used as alternative

Cheongju International (CJJ)

Cheongju International is a useful alternative, serving as a primary low-cost carrier hub for regional international routes.

Seoul, South Korea

84% AI deal score

$6,251

$4,822

Save $1,429

Alaska Airlines, Inc., +1

Business Class

Frequently Asked Questions About Flights to Seoul

Cheap Flights from St. Louis to Seoul

Today’s best flight deals from St. Louis to Seoul

St. Louis to Seoul: Overview

Insights for flights from St. Louis to Seoul

How much is a round trip from St. Louis to Seoul

The cheapest time to fly from St. Louis to Seoul

Direct flights from St. Louis to Seoul

Last-minute flights going from St. Louis to Seoul

Biggest price drops on these dates for flights from St. Louis to Seoul

Popular Airports to fly from St. Louis to Seoul

St. Louis - Seoul route insights

Recent fares are below the typical level.

January is historically the cheapest month to fly.

Flights typically take 38h 54m.

Connecting flights are dominant for this route.

Frontier Airlines had a recent deal for $947.

Deals are frequent for this route.

St. Louis main airports to depart from

Seoul main airports to arrive at

Airports nearby Seoul used as alternative

Business & First Class Flight Deals to Seoul

Best Elite deals to Seoul

Oct 24

Nov 08

Oct 27

Oct 27

Nov 11

Nov 11

Oct 27

Oct 24

Oct 29

Nov 03

Nov 08

Oct 27

Frequently Asked Questions About Flights to Seoul

How can I find cheap flights from St. Louis to Seoul?

When should I book flights from St. Louis to Seoul?

Should I compare nearby airports for flights from St. Louis to Seoul?

Are direct flights from St. Louis to Seoul always the best option?

Can flexible travel dates help on St. Louis to Seoul flights?

What extra costs should I check before booking St. Louis to Seoul flights?

Related routes

More routes from St. Louis

Flights to Seoul from other cities

St. Louis to Seoul: Overview

Insights for flights from St. Louis to Seoul

How much is a round trip from St. Louis to Seoul

The cheapest time to fly from St. Louis to Seoul

Direct flights from St. Louis to Seoul

Last-minute flights going from St. Louis to Seoul

Biggest price drops on these dates for flights from St. Louis to Seoul

Popular Airports to fly from St. Louis to Seoul

St. Louis - Seoul route insights

Recent fares are below the typical level.

January is historically the cheapest month to fly.

Flights typically take 38h 54m.

Connecting flights are dominant for this route.

Frontier Airlines had a recent deal for $947.

Deals are frequent for this route.

St. Louis main airports to depart from

Seoul main airports to arrive at

Airports nearby Seoul used as alternative

Business & First Class Flight Deals to Seoul

Best Elite deals to Seoul

Oct 24

Nov 08

Oct 27

Oct 27

Nov 11

Nov 11

Oct 27

Oct 24

Oct 29

Nov 03

Nov 08

Oct 27

Frequently Asked Questions About Flights to Seoul

How can I find cheap flights from St. Louis to Seoul?

When should I book flights from St. Louis to Seoul?

Should I compare nearby airports for flights from St. Louis to Seoul?