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$424+ Cheap flights from Washington, D.C. (WAS) to Seoul (SEL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — SEL
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. to Seoul are usually found in January or March, booked 43 days in advance, depart on a Tuesday or Wednesday and return on a Sunday

Cheap flight deals from Washington, D.C. to Seoul

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to Seoul (SEL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$962
(Kiwi.com)

One-way from

$424
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$1,268

Good round-trip deal

$1,252 or less

Good one-way deal

$617 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Seoul (SEL) flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Seoul (SEL) flights.
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From Washington, D.C. (WAS) to Seoul (SEL)
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One-way flight from Washington, D.C. (WAS) to Seoul (SEL)
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Highest demand for flights based on searches. 16% potential increase in price ($262 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($42 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Washington, D.C. (WAS) to Seoul (SEL).
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Price to beat on a one-way flight from Washington, D.C. (WAS) to Seoul (SEL).
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Find flight deals from Washington, D.C. to Seoul

Cheapest flights from Washington, D.C. to Seoul
Explore the most affordable flight options available from Washington, D.C. to Seoul. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 3, 2025.

This Mytrip deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/22:26 pmBWI - ICN
3 stops31h 54mMultiple Airlines
Wed 12/105:55 pmICN - BWI
3 stops32h 50mMultiple Airlines
Deal found 11/1$988
This Mytrip deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1810:22 amBWI - ICN
3 stops35h 58mMultiple Airlines
Sun 12/710:20 pmICN - BWI
2 stops28h 25mMultiple Airlines
Deal found 11/1$999
This Mytrip deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/252:26 pmBWI - ICN
3 stops31h 54mMultiple Airlines
Thu 12/41:20 pmICN - BWI
2 stops24h 25mMultiple Airlines
Deal found 11/2$1,001
This Ovago deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/91:30 pmIAD - ICN
1 stop38h 50mTurkish Airlines
Wed 11/1912:10 amICN - IAD
1 stop25h 35mTurkish Airlines
Deal found 11/3$1,010
This Kiwi.com deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/11:30 pmIAD - ICN
1 stop29h 35mMultiple Airlines
Mon 12/86:55 pmICN - IAD
2 stops33h 34mMultiple Airlines
Deal found 11/1$1,011
This Kiwi.com deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/241:30 pmIAD - ICN
1 stop29h 35mMultiple Airlines
Sun 12/149:20 pmICN - IAD
2 stops27h 04mMultiple Airlines
Deal found 11/2$1,012
This Mytrip deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1610:25 amBWI - ICN
3 stops35h 55mMultiple Airlines
Sun 11/231:20 pmICN - BWI
3 stops34h 16mMultiple Airlines
Deal found 11/3$1,015
This KAYAK deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/21:30 pmIAD - ICN
1 stop38h 50mTurkish Airlines
Fri 12/512:10 amICN - IAD
1 stop25h 35mTurkish Airlines
Deal found 11/2$1,016
This Mytrip deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/38:40 pmDCA - ICN
2 stops34h 55mMultiple Airlines
Sat 12/139:20 pmICN - DCA
2 stops25h 35mMultiple Airlines
Deal found 11/1$1,017
This Kiwi.com deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/41:30 pmIAD - ICN
1 stop29h 35mMultiple Airlines
Tue 12/99:55 pmICN - IAD
2 stops30h 34mMultiple Airlines
Deal found 11/1$1,017
This Kiwi.com deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/42:00 pmDCA - ICN
2 stops36h 20mMultiple Airlines
Wed 12/101:20 pmICN - DCA
1 stop20h 40mMultiple Airlines
Deal found 11/1$1,018
This Kiwi.com deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/181:30 pmIAD - ICN
1 stop38h 50mTurkish Airlines
Tue 12/1612:10 amICN - IAD
1 stop25h 35mTurkish Airlines
Deal found 11/2$1,018

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Seoul 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, Cheapflights users made 2,558,603 searches. Data last updated November 3, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Seoul that are best for you.

Fly from

Washington, D.C.

Fly to

Seoul

Route

Depart

Return

Price

BaltimoreIncheon

BWI - ICN

BWIICN

Baltimore/Washington

Wed 2/4

1:02 pm-5:45 am

1 stop26h 43m

Incheon Intl

Wed 2/18

6:00 pm-12:39 am

1 stop20h 39m

$1,046

BaltimoreIncheon

BWI - ICN

BWIICN

Baltimore/Washington

Tue 2/10

12:25 pm-5:40 am

2 stops27h 15m

Incheon Intl

Thu 2/19

12:45 pm-5:20 pm

1 stop18h 35m

$1,046

BaltimoreIncheon

BWI - ICN

BWIICN

Baltimore/Washington

Thu 2/19

6:00 am-4:50 pm

1 stop20h 50m

Incheon Intl

Sun 6/28

7:40 pm-6:03 am

1 stop23h 23m

$1,046

BaltimoreIncheon

BWI - ICN

BWIICN

Baltimore/Washington

Wed 2/18

12:37 pm-5:40 am

2 stops27h 03m

Incheon Intl

Sun 3/1

12:45 pm-5:20 pm

1 stop18h 35m

$1,046

BaltimoreIncheon

BWI - ICN

BWIICN

Baltimore/Washington

Mon 2/9

1:02 pm-5:45 am

1 stop26h 43m

Incheon Intl

Sun 2/15

6:00 pm-12:39 am

1 stop20h 39m

$1,046

BaltimoreIncheon

BWI - ICN

BWIICN

Baltimore/Washington

Fri 2/13

6:00 am-4:50 pm

1 stop20h 50m

Incheon Intl

Sun 2/22

6:00 pm-12:39 am

1 stop20h 39m

$1,046

BaltimoreIncheon

BWI - ICN

BWIICN

Baltimore/Washington

Fri 2/20

6:19 am-3:30 pm

1 stop19h 11m

Incheon Intl

Sun 3/8

7:40 pm-6:07 am

1 stop23h 27m

$1,046

BaltimoreIncheon

BWI - ICN

BWIICN

Baltimore/Washington

Tue 2/17

10:30 am-5:40 am

2 stops29h 10m

Incheon Intl

Thu 2/26

12:45 pm-9:27 pm

2 stops22h 42m

$1,051

BaltimoreIncheon

BWI - ICN

BWIICN

Baltimore/Washington

Tue 2/17

12:37 pm-5:40 am

2 stops27h 03m

Incheon Intl

Mon 3/9

5:00 pm-11:24 pm

2 stops19h 24m

$1,051

Washington, D.C.Incheon

DCA - ICN

DCAICN

Washington, D.C. Reagan-National

Thu 1/8

6:56 pm-6:35 pm

2 stops33h 39m

Incheon Intl

Mon 1/19

8:35 pm-5:56 pm

2 stops35h 21m

$1,134

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/1

Showing 1-10 of 60 results
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Compare providers for flights from Washington, D.C. to Seoul

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Washington, D.C. to Seoul in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C.-Seoul flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Washington, D.C.-Seoul flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Washington, D.C.-Seoul flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C.-Seoul flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C.-Seoul flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Washington, D.C. to Seoul

Have a flexible travel schedule? Discover the best time to fly to Seoul from Washington, D.C. with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to Seoul

How far ahead should I book a flight from Washington, D.C. to Seoul?

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to Seoul. Price data was last updated on October 31, 2025.

To ensure you get the cheapest price possible for a flight from Washington, D.C. to Seoul, you should look to book at least 43 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Washington, D.C. to Seoul?

Currently, October is the cheapest month in which you can book a flight from Washington, D.C. to Seoul (average of $407). Flying from Washington, D.C. to Seoul in July is currently the most expensive (average of $1,077). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from WAS to SEL?

Find hourly flight availability from Washington, D.C. to Seoul. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 3, 2025.

When flying from Washington, D.C. to Seoul, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 23% versus a flight at noon.

What is the cheapest day to fly from Washington, D.C. to Seoul?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Seoul. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Washington, D.C. to Seoul flight should consider departing on Monday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Washington, D.C. to Seoul

Explore weekly flight availability from Washington, D.C. to Seoul. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated November 3, 2025.

The most flights from WAS to SEL are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

How much does it cost to fly round-trip from Washington, D.C. to Seoul?

What’s the top layover airport for flights from Washington, D.C. to Seoul?

Share of 1-stop round-trip flights from Washington, D.C. to Seoul chosen by Cheapflights users in the past 12 months, using the same layover each way.

Istanbul (IST) – chosen by Cheapflights users on 42% of 1-stop itineraries from Washington, D.C. to Seoul on Cheapflights.

What’s the cheapest layover airport for flights from Washington, D.C. to Seoul?

Average round-trip fare for 1-stop flights from Washington, D.C. to Seoul, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Istanbul (IST) is the most affordable 1-stop option, with an average round-trip price of $939.

What’s the fastest layover option from Washington, D.C. to Seoul?

Shortest average travel time for 1-stop one-way flights from Washington, D.C. to Seoul, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Toronto (YYZ) have the shortest average one-way travel time for 1-stop routes: 17h 30m.

Which airport typically offers the quickest layover for flights from Washington, D.C. to Seoul?

Average layover duration for 1-stop one-way flights from Washington, D.C. to Seoul, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Toronto (YYZ) offer the fastest connection on this route, with an average layover time of 1h 17m.

The best insider tips for Washington, D.C. to Seoul flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. to Seoul trip
Airports
IAD

For afternoon departures, expect crowded check-in areas at IAD. Arrive early to navigate the busy terminals efficiently.

Read more about IADby Ramsey Qubein
ICN

Use the AREX express train for a quick 40-50 minute trip from ICN to Seoul Station. It's a convenient and fast option.

Read more about ICNby Gabriel Leigh
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on ICN

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on IAD

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Reviews of airlines servicing Seoul

Get insights into the airlines that provide service to Seoul. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seoul. Reviews last updated November 3, 2025.
See what other customers who have flown with Korean Air, Delta, and United Airlines from Washington, D.C. to Seoul have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,158 reviews

Entertainment

8.2

Boarding

8.5

Crew

8.7

Food

8.1

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Korean Air
8.4
Very good
1,158 reviews
Korean Air
8.4
Very good
1,158 reviews

Entertainment

8.2

Boarding

8.5

Crew

8.7

Food

8.1

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Delta
7.9
Good
8,001 reviews
Korean Air
8.4
Very good
1,158 reviews

Entertainment

8.2

Boarding

8.5

Crew

8.7

Food

8.1

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
United Airlines
7.4
Good
8,996 reviews
Korean Air
8.4
Very good
1,158 reviews

Entertainment

8.2

Boarding

8.5

Crew

8.7

Food

8.1

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
American Airlines
7.2
Good
11,035 reviews
Korean Air
8.4
Very good
1,158 reviews

Entertainment

8.2

Boarding

8.5

Crew

8.7

Food

8.1

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Air Canada
7.1
Good
10,394 reviews
Korean Air
8.4
Very good
1,158 reviews

Entertainment

8.2

Boarding

8.5

Crew

8.7

Food

8.1

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to Seoul. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Washington, D.C. to Seoul?

    Delta, United Airlines, and Alaska Airlines can get you from Washington, D.C. to Seoul in just under 26h 43m. Your travel time can differ by up to 6h 56m. There are 6938 mi between Washington, D.C. and Seoul. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Washington, D.C. to Seoul round-trip?

    United Airlines, at $317, was found to be the cheapest airline from Washington, D.C. to Seoul.Alternate airlines to your destination round-trip include Delta and Air China. United Airlines is currently priced 76% below the average price you’ll pay for this route.

  • What are the most popular routes from Washington, D.C. to Seoul?

    When deciding which route to take from Washington, D.C. to Seoul consider Washington, D.C. Dulles Intl - Incheon Intl, Baltimore/Washington - Incheon Intl or Washington, D.C. Reagan-National - Incheon Intl as they are the most popular.

  • What are the cheapest flights from Washington, D.C. to Seoul?

    Looking at all options, your cheapest flight can be booked for $549. While the most popular route (Washington, D.C. Dulles Intl - Incheon Intl) can be booked for $920 on average, our data indicates $2,901 when flying from Washington, D.C. to Seoul.

  • Can I find deals for flights from Washington, D.C. to Seoul that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to Seoul flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to Seoul?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Seoul.

  • Can I find deals for business class flights from Washington, D.C. to Seoul?

    Yes. Cheapflights offers flight deals from Washington, D.C. to Seoul by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Washington, D.C. to Seoul?

    Currently, October is the cheapest month in which you can book a flight from Washington, D.C. to Seoul (average of $407). Flying from Washington, D.C. to Seoul in July is currently the most expensive (average of $1,077). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 8 airlines flying from Washington, D.C. to Seoul

Discover the top 8 airlines that operate flights from Washington, D.C. to Seoul. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$317Average$1,438FlexibilityNo cancel feeOn-time69%
DeltaCheapest$397Average$1,621FlexibilityNo cancel feeOn-timeN/A
Air ChinaCheapest$591Average$747FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$716Average$1,140FlexibilityNo cancel feeOn-time71%
Asiana AirlinesCheapest$759Average$2,072FlexibilityNo cancel feeOn-time76%
Turkish AirlinesCheapest$791Average$992FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$864Average$1,393FlexibilityNo cancel feeOn-time67%
Korean AirCheapest$1,059Average$1,747FlexibilityNo cancel feeOn-time81%

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