$423 Cheap Flights from Seattle (SEA) to Seoul (ICN)

View $423 flight on Wed, Oct 15, 2025Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Incheon Intl. Airport (ICN)

Today's featured flight deals from Seattle-Tacoma International Airport (SEA) to Incheon Intl. Airport (ICN)

Nonstop
Carry-on included
Lower price than typical

Cheap Flights from Seattle to Seoul (SEA-ICN)

Prices were available within the past 7 days and start at $423 for one-way flights and $744 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, Aug 11 - Sun, Aug 24
SEA
Seattle
ICN
Seoul
$744 Roundtrip, found 12 hours ago
$744
Roundtrip
found 12 hours ago
Select Alaska Airlines flight, departing Mon, Aug 11 from Seattle to Seoul, returning Sun, Aug 24, priced at $744 found 12 hours ago
Alaska Airlines
Mon, Sep 15 - Wed, Sep 24
SEA
Seattle
ICN
Seoul
$748 Roundtrip, found 11 hours ago
$748
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Mon, Sep 15 from Seattle to Seoul, returning Wed, Sep 24, priced at $748 found 11 hours ago
Alaska Airlines
Sun, Aug 17 - Tue, Aug 26
SEA
Seattle
ICN
Seoul
$763 Roundtrip, found 8 hours ago
$763
Roundtrip
found 8 hours ago
Select Alaska Airlines flight, departing Sun, Aug 17 from Seattle to Seoul, returning Tue, Aug 26, priced at $763 found 8 hours ago
Cathay Pacific
Tue, Aug 26 - Tue, Sep 2
SEA
Seattle
ICN
Seoul
$768 Roundtrip, found 7 hours ago
$768
Roundtrip
found 7 hours ago
Select Cathay Pacific flight, departing Tue, Aug 26 from Seattle to Seoul, returning Tue, Sep 2, priced at $768 found 7 hours ago
Air Canada
Sat, Sep 27 - Tue, Sep 30
SEA
Seattle
ICN
Seoul
$772 Roundtrip, just found
$772
Roundtrip
just found
Select Air Canada flight, departing Sat, Sep 27 from Seattle to Seoul, returning Tue, Sep 30, priced at $772 just found
Cathay Pacific
Wed, Aug 27 - Tue, Sep 9
SEA
Seattle
ICN
Seoul
$787 Roundtrip, found 7 hours ago
$787
Roundtrip
found 7 hours ago
Select Cathay Pacific flight, departing Wed, Aug 27 from Seattle to Seoul, returning Tue, Sep 9, priced at $787 found 7 hours ago
Asiana Airlines
Thu, Oct 2 - Mon, Oct 6
SEA
Seattle
ICN
Seoul
$841 Roundtrip, just found
$841
Roundtrip
just found
Select Asiana Airlines flight, departing Thu, Oct 2 from Seattle to Seoul, returning Mon, Oct 6, priced at $841 just found
Hawaiian Airlines
Thu, Oct 2 - Mon, Oct 6
SEA
Seattle
ICN
Seoul
$842 Roundtrip, just found
$842
Roundtrip
just found
Select Hawaiian Airlines flight, departing Thu, Oct 2 from Seattle to Seoul, returning Mon, Oct 6, priced at $842 just found
Delta
Thu, Oct 2 - Mon, Oct 6
SEA
Seattle
ICN
Seoul
$842 Roundtrip, just found
$842
Roundtrip
just found
Select Delta flight, departing Thu, Oct 2 from Seattle to Seoul, returning Mon, Oct 6, priced at $842 just found
Alaska Airlines
Thu, Oct 2 - Mon, Oct 6
SEA
Seattle
ICN
Seoul
$842 Roundtrip, just found
$842
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Oct 2 from Seattle to Seoul, returning Mon, Oct 6, priced at $842 just found

Find the cheapest month to fly from Seattle (SEA) to Seoul (ICN)

September is typically the cheapest month to fly

From $771 - $1,101 per traveler.

Graph displaying average flight prices per month

Alternative airports near Seoul

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Gimpo Intl. GMP. Closest option available. Average driving time to city center is 20 minutes. Flights from $1,045
GMP
Gimpo Intl.
Closest
Average driving time to city center20 min
Flights from $1,045
Flights from Seattle (SEA) to Seoul (ICN)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Incheon Intl.
Airlines serving
Air Canada, Air China, Alaska Airlines, All Nippon Airways, American Airlines, Asiana Airlines, Cathay Pacific, China Airlines, Delta, EVA Airways, Hawaiian Airlines, Korean Air, Philippine Airlines, Singapore Airlines, Turkish Airlines, United, WestJet
Roundtrip price
$743
Distance
5203 mi
Average flight time
27 hours 26 mins

Seattle to Seoul Flights

The cheapest times to fly from Seattle to Seoul

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Seoul are during the month of August. You can find some of the cheapest flights from Seattle to Seoul with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Seoul

Sunday is one of the best days to book for cheap flights from Seattle to Seoul: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Seoul

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Seoul in 2025. You can also book with separate airlines for your outbound and return journeys, from $423 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Seoul flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Seoul airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN) cost?
Lock in a cheap one-way flight from $423 or cheap return flight from $744 from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN)?
August is the most affordable month to fly from SEA to ICN. Traveling outside of peak seasons is often the key to finding better fares.
Which airlines fly direct from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN)?
Avoid the detours and fly straight to Incheon Intl. Airport (ICN) from Seattle - Tacoma Intl. Airport (SEA) with 3 carriers, including:

  • Delta Air Lines
  • Asiana Airlines
  • Korean Air

What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN)?
While prices can change depending on when you travel, Asiana Airlines and Korean Air are popular choices for flights between Seattle - Tacoma Intl. Airport (SEA) and Incheon Intl. Airport (ICN). You can also compare airlines on Expedia and use the "Sort by" filter to find the cheapest fare for your SEA to ICN flight.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN)?
When departing from Seattle - Tacoma Intl. Airport (SEA), you can choose from an average of 3 daily direct flights to Incheon Intl. Airport (ICN).
What are the most popular departure times for flights from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN)?
Flights between SEA and ICN are busiest at 10 AM. For a less crowded experience and possibly cheaper tickets, look for a departure that's outside typical rush times.
What day of the week has the most flights from SEA to ICN?
Friday offers the most flights from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN). Consider taking off on this day and you'll have the best chance of finding a schedule that works for you.
What is the earliest flight from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN)?
The first flight of the day leaving Seattle - Tacoma Intl. Airport (SEA) is at around 10:44AM UTC-8. Catch this flight and you'll touch down at Incheon Intl. Airport (ICN) at approximately 4:15PM UTC+9. The overall travel time is 12h 31m.
How long does it take to fly from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN)?
Flights from SEA to ICN have an average travel time of 12 hours and 11 minutes. The total distance between the two is 5,200 mi.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN)?
To reach Incheon Intl. Airport (ICN) on schedule, select a flight that leaves Seattle - Tacoma Intl. Airport (SEA) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Seoul from Seattle - Tacoma Intl. Airport (SEA)?
Browse your flight options from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN). This is the only Seoul airport you can jet into if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN) last-minute?
Last-minute fares from SEA to ICN are typically more expensive. To lock in the cheapest rates, start searching for flights well in advance. That said, if you're flexible with your travel plans, it's possible to land a cheap fare just before your departure.
Is it cheaper to book a SEA to ICN flight and hotel package?
You can save money by booking a SEA to ICN flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one place. Once you've selected your ideal accommodations and flights, consider other add-ons like tours, activities and car rentals.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Incheon Intl. Airport (ICN)?
If you reserved your SEA to ICN flight within the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of fare you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you'd like more information.

Explore a world of travel with Expedia

*Available to One Key members.