$435 Cheap Flights from Seoul (ICN) to Seattle (SEA)

View $435 flight on Thu, Oct 9, 2025Opens in a new window

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

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Cheap Flights from Seoul to Seattle (ICN-SEA)

Prices were available within the past 7 days and start at $435 for one-way flights and $503 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sat, Sep 20 - Sun, Sep 21
ICN
Seoul
SEA
Seattle
$503 Roundtrip, just found
$503
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Sep 20 from Seoul to Seattle, returning Sun, Sep 21, priced at $503 just found
Hawaiian Airlines
Sat, Sep 20 - Sun, Sep 21
ICN
Seoul
SEA
Seattle
$503 Roundtrip, just found
$503
Roundtrip
just found
Select Hawaiian Airlines flight, departing Sat, Sep 20 from Seoul to Seattle, returning Sun, Sep 21, priced at $503 just found
Alaska Airlines
Fri, Oct 24 - Fri, Oct 31
ICN
Seoul
SEA
Seattle
$507 Roundtrip, found 9 hours ago
$507
Roundtrip
found 9 hours ago
Select Alaska Airlines flight, departing Fri, Oct 24 from Seoul to Seattle, returning Fri, Oct 31, priced at $507 found 9 hours ago
Alaska Airlines
Fri, Oct 24 - Sun, Nov 2
ICN
Seoul
SEA
Seattle
$509 Roundtrip, found 13 hours ago
$509
Roundtrip
found 13 hours ago
Select Alaska Airlines flight, departing Fri, Oct 24 from Seoul to Seattle, returning Sun, Nov 2, priced at $509 found 13 hours ago
Alaska Airlines
Sat, Sep 13 - Fri, Sep 26
ICN
Seoul
SEA
Seattle
$513 Roundtrip, found 1 hour ago
$513
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Sat, Sep 13 from Seoul to Seattle, returning Fri, Sep 26, priced at $513 found 1 hour ago
Alaska Airlines
Mon, Nov 3 - Fri, Nov 14
ICN
Seoul
SEA
Seattle
$513 Roundtrip, found 5 days ago
$513
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Mon, Nov 3 from Seoul to Seattle, returning Fri, Nov 14, priced at $513 found 5 days ago
United
Sun, Dec 14 - Wed, Jan 7
ICN
Seoul
SEA
Seattle
$531 Roundtrip, found 6 hours ago
$531
Roundtrip
found 6 hours ago
Select United flight, departing Sun, Dec 14 from Seoul to Seattle, returning Wed, Jan 7, priced at $531 found 6 hours ago
Asiana Airlines
Tue, Dec 2 - Fri, Dec 5
ICN
Seoul
SEA
Seattle
$557 Roundtrip, found 2 hours ago
$557
Roundtrip
found 2 hours ago
Select Asiana Airlines flight, departing Tue, Dec 2 from Seoul to Seattle, returning Fri, Dec 5, priced at $557 found 2 hours ago
Delta
Sun, Oct 5 - Sat, Feb 14
ICN
Seoul
SEA
Seattle
$593 Roundtrip, found 6 hours ago
$593
Roundtrip
found 6 hours ago
Select Delta flight, departing Sun, Oct 5 from Seoul to Seattle, returning Sat, Feb 14, priced at $593 found 6 hours ago
Korean Air
Fri, Dec 19 - Sat, Jan 3
ICN
Seoul
SEA
Seattle
$609 Roundtrip, found 1 hour ago
$609
Roundtrip
found 1 hour ago
Select Korean Air flight, departing Fri, Dec 19 from Seoul to Seattle, returning Sat, Jan 3, priced at $609 found 1 hour ago

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

May is typically the cheapest month to fly

From $467 - $877 per traveler.

Graph displaying average flight prices per month

Alternative airports near Seattle

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

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $808
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $808
Flights from Seoul (ICN) to Seattle (SEA)
Origin airport
Incheon Intl.
Destination airport
Seattle - Tacoma 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, Japan Airlines, Korean Air, Philippine Airlines, United, WestJet
Roundtrip price
$502
Distance
5203 mi
Average flight time
-5 hours -35 mins

Seoul to Seattle Flights

The cheapest times to fly from Seoul to Seattle

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 Seoul to Seattle are during the month of September. You can find some of the cheapest flights from Seoul to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seoul to Seattle

Sunday is one of the best days to book for cheap flights from Seoul to Seattle: 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 Seoul to Seattle

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 Seoul to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $435 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 Seoul to Seattle 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 Seoul to Seattle 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 Incheon Intl. Airport (ICN) to Seattle - Tacoma Intl. Airport (SEA) cost?
You can land cheap return flights from Incheon Intl. Airport (ICN) to Seattle - Tacoma Intl. Airport (SEA) starting at $504. Grab a seat and take off on your trip. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Alaska Airlines flight leaving ICN on August 19 2025 and touching down at SEA. The price was last updated on July 23 2025 and has not changed since.
What is the cheapest month to fly from ICN to SEA?
The cheapest flights from ICN to SEA are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Incheon Intl. Airport (ICN) to Seattle - Tacoma Intl. Airport (SEA)?
Skip the stopovers and travel nonstop to Seattle - Tacoma Intl. Airport (SEA) from Incheon Intl. Airport (ICN) with 3 carriers, including:

  • Korean Air
  • Delta Air Lines
  • Asiana Airlines

What is the cheapest airline that flies from ICN to SEA?
With prices as low as $625 for a one-way journey from ICN to SEA, Alaska Airlines is currently the cheapest carrier for this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from ICN on October 17 2025. Prices were last updated on July 23 2025 and have not changed since.
How many flights per day from Incheon Intl. Airport (ICN) to Seattle - Tacoma Intl. Airport (SEA)?
When flying out of Incheon Intl. Airport (ICN), you can take your pick from an average of 3 daily nonstop flights to Seattle - Tacoma Intl. Airport (SEA).
What are the most popular departure times for flights from Incheon Intl. Airport (ICN) to Seattle - Tacoma Intl. Airport (SEA)?
The 4 PM departures from ICN to SEA are the top choice for many travelers. Greater demand means you'll likely pay more for these departures. If you want to save money, book during off-peak hours.
What day of the week has the most flights from ICN to SEA?
If you fly on a Sunday, you'll get the largest range of choices for flights from Incheon Intl. Airport (ICN) to Seattle - Tacoma Intl. Airport (SEA).
What is the earliest flight from Incheon Intl. Airport (ICN) to Seattle - Tacoma Intl. Airport (SEA)?
Incheon Intl. Airport (ICN)'s first flight to Seattle - Tacoma Intl. Airport (SEA) is at approximately 4:10PM UTC+9. With a flight time of 9h 50m, you'll touch down at around 9:00AM UTC-8.
How long does it take to fly from Incheon Intl. Airport (ICN) to Seattle - Tacoma Intl. Airport (SEA)?
The average flight time from ICN to SEA is 10 hours and 1 minute, covering a distance of 5,200 mi.
What is the best time to fly from Incheon Intl. Airport (ICN) to Seattle - Tacoma Intl. Airport (SEA)?
To reach Seattle - Tacoma Intl. Airport (SEA) without delays, choose a flight that takes off from Incheon Intl. Airport (ICN) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**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 Seattle from Incheon Intl. Airport (ICN)?
If you're traveling on a direct flight from Incheon Intl. Airport (ICN) to Seattle, Seattle - Tacoma Intl. Airport (SEA) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from Incheon Intl. Airport (ICN) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Booking your plane ticket from ICN to SEA shortly before your getaway is usually more expensive. But if there's some wiggle room with your departure times and dates, you could bag a cheap last-minute fare.
Is it cheaper to book an ICN to SEA flight and hotel package?
Compared with arranging flights and hotels separately, booking an ICN to SEA flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one place takes the hassle out of travel planning. Just secure your flights and select from our extensive range of hotels, then tailor your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from Incheon Intl. Airport (ICN) to Seattle - Tacoma Intl. Airport (SEA)?
If you reserved your ICN to SEA flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of fare you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more information.

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*Available to One Key members.