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Cheap flights from Washington to Seoul from $442

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Seoul departing on 3/9. 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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0 bags

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Cheap round-trip flights

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Multiple Airlines Logo
10:05 am - 9:55 pmSEA-GMP
18h 50m2 stops
Multiple Airlines Logo
2:00 pm - 3:01 pmGMP-SEA
17h 01m2 stops
$837Multiple Airlines
Find Deal
Wed, Mar 4 - Thu, Mar 12
Japan Airlines Logo
1:30 pm - 9:50 pmSEA-GMP
16h 20m1 stop
Japan Airlines Logo
8:00 am - 10:50 amGMP-SEA
18h 50m1 stop
$849Japan Airlines
Find Deal
Tue, Oct 21 - Wed, Oct 29
Japan Airlines Logo
1:30 pm - 9:50 pmSEA-GMP
16h 20m1 stop
Japan Airlines Logo
12:05 pm - 5:05 pmGMP-SEA
21h 00m2 stops
$860Japan Airlines
Find Deal
Tue, Oct 21 - Wed, Oct 29
Japan Airlines Logo
12:10 pm - 10:55 amSEA-GMP
29h 45m1 stop
Japan Airlines Logo
8:00 am - 9:08 amGMP-SEA
42h 08m2 stops
$874Japan Airlines
Find Deal
Mon, Dec 1 - Mon, Dec 8
Multiple Airlines Logo
6:05 am - 10:05 pmSEA-GMP
23h 00m2 stops
Multiple Airlines Logo
8:00 am - 11:07 amGMP-SEA
20h 07m2 stops
$930Multiple Airlines
Find Deal
Mon, Dec 1 - Tue, Dec 9
EVA Air Logo
12:10 am - 12:50 pmSEA-GMP
19h 40m1 stop
EVA Air Logo
1:50 pm - 5:30 pmGMP-SEA
20h 40m1 stop
$1,023EVA Air
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Wed, Mar 4 - Sat, Mar 7
EVA Air Logo
1:30 am - 12:50 pmSEA-GMP
19h 20m1 stop
EVA Air Logo
1:50 pm - 7:30 pmGMP-SEA
21h 40m1 stop
$1,060EVA Air
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Thu, Apr 2 - Sat, Apr 18
ANA Logo
10:05 am - 10:30 pmSEA-GMP
19h 25m2 stops
ANA Logo
7:45 am - 7:16 pmGMP-SEA
27h 31m2 stops
$1,141ANA
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Wed, Mar 4 - Wed, Mar 11
ANA Logo
3:45 pm - 6:35 pmSEA-GMP
33h 50m1 stop
ANA Logo
12:25 pm - 7:16 pmGMP-SEA
23h 51m2 stops
$1,149ANA
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Thu, Jan 15 - Thu, Jan 29
Air China Logo
7:30 am - 2:10 pmPDX-GMP
37h 40m2 stops
Air China Logo
8:35 am - 2:46 pmGMP-PDX
23h 11m2 stops
$1,750Air China
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Wed, Nov 5 - Wed, Nov 12

Japan Airlines flights from State of Washington to Seoul Gimpo Intl Airport

Our best Japan Airlines deals on State of Washington to Seoul Gimpo Intl Airport flight tickets
Japan Airlines
Oct 21
SEA1:30 pmSeattle/Tacoma Intl
16h 20m
1 stop
GMP9:50 pmSeoul Gimpo Intl
Oct 29
GMP8:00 amSeoul Gimpo Intl
18h 50m
1 stop
SEA10:50 amSeattle/Tacoma Intl
$849
Find similar
Japan Airlines
Oct 21
SEA1:30 pmSeattle/Tacoma Intl
16h 20m
1 stop
GMP9:50 pmSeoul Gimpo Intl
Oct 29
GMP12:05 pmSeoul Gimpo Intl
21h 00m
2 stops
SEA5:05 pmSeattle/Tacoma Intl
$860
Find similar
Japan Airlines
Dec 1
SEA12:10 pmSeattle/Tacoma Intl
29h 45m
1 stop
GMP10:55 amSeoul Gimpo Intl
Dec 8
GMP8:00 amSeoul Gimpo Intl
42h 08m
2 stops
SEA9:08 amSeattle/Tacoma Intl
$874
Find similar

ANA flights from State of Washington to Seoul Gimpo Intl Airport

Our best ANA deals on State of Washington to Seoul Gimpo Intl Airport flight tickets
ANA
Mar 4
SEA10:05 amSeattle/Tacoma Intl
19h 25m
2 stops
GMP10:30 pmSeoul Gimpo Intl
Mar 11
GMP7:45 amSeoul Gimpo Intl
27h 31m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
$1,141
Find similar
ANA
Jan 15
SEA3:45 pmSeattle/Tacoma Intl
33h 50m
1 stop
GMP6:35 pmSeoul Gimpo Intl
Jan 29
GMP12:25 pmSeoul Gimpo Intl
23h 51m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
$1,149
Find similar
ANA
Feb 3
SEA10:05 amSeattle/Tacoma Intl
19h 25m
2 stops
GMP10:30 pmSeoul Gimpo Intl
Feb 17
GMP12:25 pmSeoul Gimpo Intl
17h 55m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$1,151
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington 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 October 9, 2025.
Use the filters below to find and compare flights from Washington to Seoul Gimpo Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSeoul

SEA - GMP

SEAGMP

Seattle/Tacoma Intl

Wed 3/4

10:05 am-9:55 pm

2 stops18h 50m

Seoul Gimpo Intl

Thu 3/12

2:00 pm-3:01 pm

2 stops17h 01m

$837

SeattleSeoul

SEA - GMP

SEAGMP

Seattle/Tacoma Intl

Tue 10/21

1:30 pm-9:50 pm

1 stop16h 20m

Seoul Gimpo Intl

Wed 10/29

8:00 am-10:50 am

1 stop18h 50m

$849

SeattleSeoul

SEA - GMP

SEAGMP

Seattle/Tacoma Intl

Tue 10/21

1:30 pm-9:50 pm

1 stop16h 20m

Seoul Gimpo Intl

Wed 10/29

12:05 pm-5:05 pm

2 stops21h 00m

$860

SeattleSeoul

SEA - GMP

SEAGMP

Seattle/Tacoma Intl

Mon 12/1

12:10 pm-10:55 am

1 stop29h 45m

Seoul Gimpo Intl

Mon 12/8

8:00 am-9:08 am

2 stops42h 08m

$874

SeattleSeoul

SEA - GMP

SEAGMP

Seattle/Tacoma Intl

Mon 12/1

6:05 am-10:05 pm

2 stops23h 00m

Seoul Gimpo Intl

Tue 12/9

8:00 am-11:07 am

2 stops20h 07m

$930

SeattleSeoul

SEA - GMP

SEAGMP

Seattle/Tacoma Intl

Wed 3/4

12:10 am-12:50 pm

1 stop19h 40m

Seoul Gimpo Intl

Sat 3/7

1:50 pm-5:30 pm

1 stop20h 40m

$1,023

SeattleSeoul

SEA - GMP

SEAGMP

Seattle/Tacoma Intl

Thu 4/2

1:30 am-12:50 pm

1 stop19h 20m

Seoul Gimpo Intl

Sat 4/18

1:50 pm-7:30 pm

1 stop21h 40m

$1,060

SeattleSeoul

SEA - GMP

SEAGMP

Seattle/Tacoma Intl

Wed 3/4

10:05 am-10:30 pm

2 stops19h 25m

Seoul Gimpo Intl

Wed 3/11

7:45 am-7:16 pm

2 stops27h 31m

$1,141

SeattleSeoul

SEA - GMP

SEAGMP

Seattle/Tacoma Intl

Thu 1/15

3:45 pm-6:35 pm

1 stop33h 50m

Seoul Gimpo Intl

Thu 1/29

12:25 pm-7:16 pm

2 stops23h 51m

$1,149

PortlandSeoul

PDX - GMP

PDXGMP

Portland

Wed 11/5

7:30 am-2:10 pm

2 stops37h 40m

Seoul Gimpo Intl

Wed 11/12

8:35 am-2:46 pm

2 stops23h 11m

$1,750

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 State of Washington 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 State of Washington is on a Thursday. momondo users have found tickets for Thursday departures for as low as $1,283. 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 Tuesday, with ticket prices averaging around $1,857.

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 afternoon. momondo users have found flights departing from State of Washington to Seoul Gimpo Intl Airport in the afternoon for as low as $1,250. 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 $1,586.

Cheap State of Washington to Seoul Gimpo Intl Airport flight deals and tips

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

Direct flights

None
There are no direct flights from State of Washington to Seoul Gimpo Intl Airport. There are no popular flight routes from State of Washington to Seoul Gimpo Intl Airport.
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  • When did momondo last update prices for flights from Washington to Seoul Gimpo Intl Airport?

    Prices for flights from Washington to Seoul Gimpo Intl Airport were last updated today.

  • How old do you have to be to fly from Washington 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 Washington to Seoul Gimpo Intl Airport.

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

    The necessary travel and health documents for your Seoul Gimpo Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington to Seoul for you.

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

momondo does allow users to show only those flights to Seoul from Washington which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search for Washington to Seoul flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from Washington to Seoul now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Seoul and let you know when they change.

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