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Cheap flights from Illinois to Seoul from $446

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Seoul departing on 8/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

Japan Airlines Logo
6:45 am - 9:50 pmSTL-GMP
25h 05m2 stops
Japan Airlines Logo
7:55 am - 3:52 pmGMP-STL
21h 57m2 stops
$866Japan Airlines
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Tue, Aug 26 - Thu, Sep 4
Japan Airlines Logo
6:45 am - 9:50 pmSTL-GMP
25h 05m2 stops
Japan Airlines Logo
12:05 pm - 1:23 pmGMP-STL
39h 18m2 stops
$868Japan Airlines
Find Deal
Tue, Aug 26 - Mon, Sep 8
Japan Airlines Logo
9:56 am - 10:45 amSTL-GMP
34h 49m2 stops
Japan Airlines Logo
7:50 am - 11:10 amGMP-STL
18h 20m2 stops
$871Japan Airlines
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Mon, Sep 29 - Wed, Feb 25
EVA Air Logo
12:30 am - 6:10 pmORD-GMP
27h 40m1 stop
EVA Air Logo
8:20 pm - 8:45 pmGMP-ORD
38h 25m1 stop
$1,118EVA Air
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Sun, Sep 21 - Wed, Oct 1
Logo
7:09 pm - 1:05 pmORD-GMP
27h 56m2 stops
Logo
2:25 pm - 10:42 amGMP-ORD
34h 17m3 stops
$1,122
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Fri, Sep 5 - Fri, Sep 12
EVA Air Logo
12:30 am - 6:10 pmORD-GMP
27h 40m1 stop
EVA Air Logo
8:20 pm - 8:45 pmGMP-ORD
38h 25m1 stop
$1,123EVA Air
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Sun, Aug 24 - Wed, Sep 3
Logo
12:54 pm - 1:05 pmORD-GMP
34h 11m2 stops
Logo
2:25 pm - 11:59 amGMP-ORD
35h 34m2 stops
$1,145
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Thu, Sep 4 - Thu, Sep 11
Air China Logo
8:50 am - 1:05 pmORD-GMP
38h 15m2 stops
Air China Logo
2:25 pm - 7:40 pmGMP-ORD
43h 15m2 stops
$1,409Air China
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Tue, Oct 14 - Tue, Oct 28
ANA Logo
8:20 am - 10:20 pmSTL-GMP
24h 00m2 stops
ANA Logo
7:55 pm - 6:23 pmGMP-STL
36h 28m2 stops
$1,923ANA
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Wed, Sep 3 - Wed, Sep 17
ANA Logo
9:17 am - 6:35 pmSTL-GMP
43h 18m2 stops
ANA Logo
7:40 am - 6:23 pmGMP-STL
24h 43m2 stops
$1,935ANA
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Wed, Sep 3 - Thu, Sep 18

Japan Airlines flights from Illinois to Seoul Gimpo Intl Airport

Our best Japan Airlines deals on Illinois to Seoul Gimpo Intl Airport flight tickets
Japan Airlines
Aug 26
STL6:45 amLambert-St Louis
25h 05m
2 stops
GMP9:50 pmSeoul Gimpo Intl
Sep 4
GMP7:55 amSeoul Gimpo Intl
21h 57m
2 stops
STL3:52 pmLambert-St Louis
$866
Find similar
Japan Airlines
Aug 26
STL6:45 amLambert-St Louis
25h 05m
2 stops
GMP9:50 pmSeoul Gimpo Intl
Sep 8
GMP12:05 pmSeoul Gimpo Intl
39h 18m
2 stops
STL1:23 pmLambert-St Louis
$868
Find similar
Japan Airlines
Aug 14
STL7:23 amLambert-St Louis
48h 27m
2 stops
GMP9:50 pmSeoul Gimpo Intl
Aug 21
GMP12:05 pmSeoul Gimpo Intl
25h 04m
2 stops
STL11:09 pmLambert-St Louis
$871
Find similar

ANA flights from Illinois to Seoul Gimpo Intl Airport

Our best ANA deals on Illinois to Seoul Gimpo Intl Airport flight tickets
ANA
Sep 3
STL8:20 amLambert-St Louis
24h 00m
2 stops
GMP10:20 pmSeoul Gimpo Intl
Sep 17
GMP7:55 pmSeoul Gimpo Intl
36h 28m
2 stops
STL6:23 pmLambert-St Louis
$1,923
Find similar
ANA
Sep 3
STL9:17 amLambert-St Louis
43h 18m
2 stops
GMP6:35 pmSeoul Gimpo Intl
Sep 18
GMP7:40 amSeoul Gimpo Intl
24h 43m
2 stops
STL6:23 pmLambert-St Louis
$1,935
Find similar
ANA
Aug 14
ORD5:45 pmChicago O'Hare Intl
27h 20m
1 stop
GMP11:05 amSeoul Gimpo Intl
Aug 27
GMP7:55 pmSeoul Gimpo Intl
26h 45m
1 stop
ORD8:40 amChicago O'Hare Intl
$1,967
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Seoul Gimpo Intl Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 7, 2025.
Use the filters below to find and compare flights from Illinois to Seoul Gimpo Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Tue 8/26

6:45 am-9:50 pm

2 stops25h 05m

Seoul Gimpo Intl

Thu 9/4

7:55 am-3:52 pm

2 stops21h 57m

$866

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Tue 8/26

6:45 am-9:50 pm

2 stops25h 05m

Seoul Gimpo Intl

Mon 9/8

12:05 pm-1:23 pm

2 stops39h 18m

$868

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Mon 9/29

9:56 am-10:45 am

2 stops34h 49m

Seoul Gimpo Intl

Wed 2/25

7:50 am-11:10 am

2 stops18h 20m

$871

ChicagoSeoul

ORD - GMP

ORDGMP

Chicago O'Hare Intl

Sun 9/21

12:30 am-6:10 pm

1 stop27h 40m

Seoul Gimpo Intl

Wed 10/1

8:20 pm-8:45 pm

1 stop38h 25m

$1,118

ChicagoSeoul

ORD - GMP

ORDGMP

Chicago O'Hare Intl

Fri 9/5

7:09 pm-1:05 pm

2 stops27h 56m

Seoul Gimpo Intl

Fri 9/12

2:25 pm-10:42 am

3 stops34h 17m

$1,122

ChicagoSeoul

ORD - GMP

ORDGMP

Chicago O'Hare Intl

Sun 8/24

12:30 am-6:10 pm

1 stop27h 40m

Seoul Gimpo Intl

Wed 9/3

8:20 pm-8:45 pm

1 stop38h 25m

$1,123

ChicagoSeoul

ORD - GMP

ORDGMP

Chicago O'Hare Intl

Thu 9/4

12:54 pm-1:05 pm

2 stops34h 11m

Seoul Gimpo Intl

Thu 9/11

2:25 pm-11:59 am

2 stops35h 34m

$1,145

ChicagoSeoul

ORD - GMP

ORDGMP

Chicago O'Hare Intl

Tue 10/14

8:50 am-1:05 pm

2 stops38h 15m

Seoul Gimpo Intl

Tue 10/28

2:25 pm-7:40 pm

2 stops43h 15m

$1,409

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Wed 9/3

8:20 am-10:20 pm

2 stops24h 00m

Seoul Gimpo Intl

Wed 9/17

7:55 pm-6:23 pm

2 stops36h 28m

$1,923

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Wed 9/3

9:17 am-6:35 pm

2 stops43h 18m

Seoul Gimpo Intl

Thu 9/18

7:40 am-6:23 pm

2 stops24h 43m

$1,935

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seoul from

How to get the cheapest flight ticket from Illinois to Seoul Gimpo Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Seoul Gimpo Intl Airport?

On average, the least expensive day to fly to Seoul Gimpo Intl Airport from Illinois is on a Monday. momondo users have found tickets for Monday departures for as low as $1,111. However, this price may fluctuate depending on the airline, the season, and holidays. The most expensive day to fly to Seoul Gimpo Intl Airport is Saturday, with ticket prices averaging around $2,662.

What is the cheapest time of day to depart on your flight to Seoul Gimpo Intl Airport?

According to our data, the cheapest time of day to fly to Seoul Gimpo Intl Airport is in the evening. momondo users have found flights departing from Illinois to Seoul Gimpo Intl Airport in the evening for as low as $1,185. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Seoul Gimpo Intl Airport is in the morning when prices are around $2,120.

Cheap Illinois to Seoul Gimpo Intl Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Seoul Gimpo Intl Airport

Best Price Found

$446

Fastest flight time

20h 35m

Direct flights

None
The best one-way flight to Seoul Gimpo Intl Airport from Illinois in the past 72 hours is $446. The best round-trip flight deal from Illinois to Seoul Gimpo Intl Airport found on momondo in the last 72 hours is $866.
The fastest flight from Illinois to Seoul Gimpo Intl Airport takes 20h 35m
There are no direct flights from Illinois to Seoul Gimpo Intl Airport. Popular non-direct routes for this connection are Lambert-St Louis Airport - Seoul Gimpo Intl Airport and Chicago O'Hare Intl Airport - Seoul Gimpo Intl Airport.
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  • When did momondo last update prices for flights from Illinois to Seoul Gimpo Intl Airport?

    Prices for flights from Illinois to Seoul Gimpo Intl Airport are updated daily.

  • How old do you have to be to fly from Illinois to Seoul Gimpo Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Illinois to Seoul Gimpo Intl Airport.

  • What documentation or ID do you need to fly to Seoul Gimpo Intl Airport?

    The required travel and health documents for your Seoul Gimpo Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seoul Gimpo Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Seoul?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to Seoul. momondo saves you time and could save you money on your trip.

Can I find flights from Illinois to Seoul with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Seoul from Illinois with this policy.

How can momondo help me find flights from Illinois to Seoul?

momondo provides multiple filters to help you find the best flight to Seoul from Illinois. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Illinois to Seoul right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Seoul, momondo offers a useful price alert feature which will track prices for flights to Seoul from Illinois and alert you when they change.

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