HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Seattle

$318+ Cheap flights from Incheon Intl (ICN) to Seattle (SEA)

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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — SEA
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Incheon Intl to Seattle with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Incheon Intl to Seattle/Tacoma Intl are usually found in May or June, booked 65 days in advance, depart on a Wednesday or Thursday and return on a Monday

Cheap flight deals from Incheon Intl to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Incheon Intl (ICN) to Seattle (SEA). 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 septiembre 11, 2025.

Round-trip from

$477
(Alaska Airlines)

One-way from

$318
(oojo)

Popular in

August

Cheapest in

May

Average price

$866

Good round-trip deal

$558 or less

Good one-way deal

$472 or less
From Incheon Intl to Seattle/Tacoma Intl
Search Deals
One-way flight from Incheon Intl to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($185 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals
Price to beat on a round-trip flight from Incheon Intl to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from Incheon Intl to Seattle/Tacoma Intl.
Search Deals

Find flight deals from Incheon Intl to Seattle

Cheapest flights from Incheon Intl to Seattle
Explore the most affordable flight options available from Incheon Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 11, 2025.

This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/208:35 pmICN - SEA
Nonstop10h 20mAlaska Airlines
mié. 12/31:40 pmSEA - ICN
Nonstop11h 55mAlaska Airlines
Deal found 9/11$477
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/249:25 pmICN - SEA
2 stops35h 20mAlaska Airlines
sáb. 10/257:59 pmSEA - ICN
2 stops31h 26mAlaska Airlines
Deal found 9/11$479
This United Airlines deal was found by Cheapflights users on 9/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/2411:30 amICN - SEA
2 stops38h 29mUnited Airlines
lun. 11/35:20 pmSEA - ICN
1 stop19h 20mUnited Airlines
Deal found 9/11$483
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/89:25 pmICN - SEA
2 stops30h 41mAlaska Airlines
jue. 11/1311:10 pmSEA - ICN
2 stops27h 15mAlaska Airlines
Deal found 9/10$484
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/259:25 pmICN - SEA
2 stops28h 57mAlaska Airlines
sáb. 11/15:30 pmSEA - ICN
2 stops33h 55mAlaska Airlines
Deal found 9/11$485
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/269:25 pmICN - SEA
2 stops29h 33mAlaska Airlines
sáb. 9/272:50 pmSEA - ICN
Nonstop11h 45mAlaska Airlines
Deal found 9/11$486
This Delta deal was found by Cheapflights users on 9/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/227:20 pmICN - SEA
Nonstop10h 10mDelta
vie. 10/3112:00 pmSEA - ICN
Nonstop11h 55mDelta
Deal found 9/10$487
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/89:25 pmICN - SEA
1 stop17h 32mAlaska Airlines
dom. 11/231:40 pmSEA - ICN
Nonstop11h 55mAlaska Airlines
Deal found 9/11$488
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/258:35 pmICN - SEA
Nonstop10h 00mAlaska Airlines
mar. 10/285:57 pmSEA - ICN
2 stops57h 28mAlaska Airlines
Deal found 9/11$489
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/179:25 pmICN - SEA
2 stops39h 15mAlaska Airlines
mié. 9/248:30 pmSEA - ICN
2 stops30h 30mAlaska Airlines
Deal found 9/10$490
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/269:25 pmICN - SEA
2 stops42h 34mAlaska Airlines
dom. 11/28:00 amSEA - ICN
1 stop18h 25mAlaska Airlines
Deal found 9/10$491
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/68:35 pmICN - SEA
Nonstop10h 20mAlaska Airlines
mié. 11/123:55 pmSEA - ICN
1 stop34h 30mAlaska Airlines
Deal found 9/10$492

Cheapflights Fare Finder

 
Customize your flight search to find flights from Incheon Intl to Seattle 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 septiembre 11, 2025.
Use the filters below to find and compare flights from Incheon Intl Airport to Seattle that are best for you.

Fly from

Incheon Intl

Fly to

Seattle

Route

Depart

Return

Price

IncheonSeattle

ICN - SEA

ICNSEA

Incheon Intl

lun. 10/13

9:25 pm-7:00 am

1 stop25h 35m

Seattle/Tacoma Intl

vie. 10/24

2:55 pm-6:35 pm

Nonstop11h 40m

$512

IncheonSeattle

ICN - SEA

ICNSEA

Incheon Intl

mar. 10/28

8:05 pm-2:20 pm

Nonstop10h 15m

Seattle/Tacoma Intl

lun. 11/3

7:25 am-5:40 pm

1 stop17h 15m

$559

IncheonSeattle

ICN - SEA

ICNSEA

Incheon Intl

mié. 2/4

9:00 pm-1:55 pm

Nonstop9h 55m

Seattle/Tacoma Intl

mié. 2/11

12:10 am-5:20 am

Nonstop12h 10m

$561

IncheonSeattle

ICN - SEA

ICNSEA

Incheon Intl

dom. 2/8

9:00 pm-1:55 pm

Nonstop9h 55m

Seattle/Tacoma Intl

sáb. 2/14

12:10 am-5:20 am

Nonstop12h 10m

$561

IncheonSeattle

ICN - SEA

ICNSEA

Incheon Intl

vie. 2/6

12:45 pm-4:29 pm

2 stops20h 44m

Seattle/Tacoma Intl

lun. 2/16

12:35 pm-5:40 am

1 stop24h 05m

$565

IncheonSeattle

ICN - SEA

ICNSEA

Incheon Intl

mié. 2/4

12:45 pm-9:58 pm

2 stops26h 13m

Seattle/Tacoma Intl

mar. 2/10

7:30 pm-5:40 am

1 stop17h 10m

$565

IncheonSeattle

ICN - SEA

ICNSEA

Incheon Intl

sáb. 2/7

12:45 pm-4:29 pm

2 stops20h 44m

Seattle/Tacoma Intl

jue. 2/12

12:35 pm-5:40 am

1 stop24h 05m

$565

IncheonSeattle

ICN - SEA

ICNSEA

Incheon Intl

mié. 2/4

12:45 pm-4:29 pm

2 stops20h 44m

Seattle/Tacoma Intl

dom. 2/15

12:35 pm-5:40 am

1 stop24h 05m

$565

IncheonSeattle

ICN - SEA

ICNSEA

Incheon Intl

vie. 2/6

12:45 pm-4:29 pm

2 stops20h 44m

Seattle/Tacoma Intl

dom. 2/15

4:58 pm-5:40 am

1 stop19h 42m

$565

IncheonSeattle

ICN - SEA

ICNSEA

Incheon Intl

vie. 2/6

12:45 pm-4:29 pm

2 stops20h 44m

Seattle/Tacoma Intl

jue. 2/12

12:35 pm-5:40 am

1 stop24h 05m

$565

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 22 results
1
2
3

The best insider tips for Incheon Intl Airport to Seattle 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 Incheon Intl Airport to Seattle trip
Airports
ICN

Plan for extra time at ICN as security lines can take up to 20 minutes, especially without fast track options.

Read more about ICNby Gabriel Leigh
SEA

Use the Link light rail for a cost-effective, 40-minute ride from SEA to downtown Seattle.

Read more about SEAby Brandon Schultz
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
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Best time to book a flight from Incheon Intl to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Incheon Intl 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 Incheon Intl Airport to Seattle

How far ahead should I book a flight from Incheon Intl Airport to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Incheon Intl to Seattle. Price data was last updated on August 29, 2025.

To ensure you get the cheapest price possible for a flight from Incheon Intl Airport to Seattle, you should look to book at least 65 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 Incheon Intl Airport to Seattle?

Currently, January is the cheapest month in which you can book a flight from Incheon Intl Airport to Seattle (average of $238). Flying from Incheon Intl Airport to Seattle in June is currently the most expensive (average of $388). 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 ICN to SEA?

Find hourly flight availability from Incheon Intl to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 11, 2025.

One of the essential ways to save on airfare from Incheon Intl Airport to Seattle is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 22% on airfare.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated septiembre 11, 2025.
See what other customers who have flown with Korean Air, Asiana Airlines, and Alaska Airlines from Incheon Intl Airport to Seattle 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
1,139 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Food

8.1

Crew

8.7

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Korean Air
8.4
Very good
1,139 reviews
Korean Air
8.4
Very good
1,139 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Food

8.1

Crew

8.7

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Asiana Airlines
8.2
Very good
479 reviews
Korean Air
8.4
Very good
1,139 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Food

8.1

Crew

8.7

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Alaska Airlines
8.0
Very good
10,000 reviews
Korean Air
8.4
Very good
1,139 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Food

8.1

Crew

8.7

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Delta
8.0
Very good
7,960 reviews
Korean Air
8.4
Very good
1,139 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Food

8.1

Crew

8.7

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Air Canada
7.1
Good
10,000 reviews
Korean Air
8.4
Very good
1,139 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Food

8.1

Crew

8.7

Entertainment

8.2

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!

Related info for your journey

Find useful and relevant information for your journey from Incheon Intl to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Seattle from Incheon Intl?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from Incheon Intl. Booking flights from Incheon Intl to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 5 daily inbound flights from Incheon Intl from 7 different airlines.

  • How popular is this Incheon Intl Airport to Seattle flight route?

    This flight path from Incheon Intl to Seattle/Tacoma Intl was viewed by 1 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Incheon Intl Airport to Seattle?

    There are many flights that can get you from Incheon Intl Airport to Seattle in 9h 55m. Fly via Alaska Airlines, Delta, or Asiana Airlines to get the fastest option. The distance from Incheon Intl Airport to Seattle is about 5200 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Incheon Intl Airport to Seattle round-trip?

    Flying on Air Canada is currently your cheapest option to Seattle, with prices starting at $472. Additional round-trip tickets that might be worth considering are offered by Alaska Airlines and Korean Air, with the lowest prices starting at $488 and $510, respectively. Air Canada is priced at 38% lower than the current average price of a flight leaving 3 months from now.

  • What are the most reliable airlines from Incheon Intl Airport to Seattle?

    Before booking your flight to Seattle from Incheon Intl Airport, check out the most reliable airlines to get you to your destination on time: Delta (40%), Korean Air (40%), Thai Airways( 18%).

  • What are the cheapest flights from Incheon Intl Airport to Seattle?

    Looking for the cheapest flight from Incheon Intl Airport to Seattle? While on average our users pay $1,526, our data indicates the cheapest price to be $276. The most popular route (Incheon Intl - Seattle/Tacoma Intl), is priced around $329.

  • Can I find deals for flights from Incheon Intl to Seattle that include hotel bookings?

    Yes. In addition to deals on Incheon Intl to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Incheon Intl to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Incheon Intl to Seattle.

  • Can I find deals for business class flights from Incheon Intl to Seattle?

    Yes. Cheapflights offers flight deals from Incheon Intl to Seattle 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 Incheon Intl Airport to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Incheon Intl Airport to Seattle (average of $238). Flying from Incheon Intl Airport to Seattle in June is currently the most expensive (average of $388). 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

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Lakewood
Ocean Shores
Lynnwood
Edmonds
Leavenworth
Lacey
Renton
Olympia
Kent
Federal Way
Cle Elum
Puyallup
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline

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.

Alternative routes for Incheon Intl to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
Incheon Intl to Portland flights
Gimpo Intl to Portland flights
Incheon Intl to Spokane flights

Top 7 airlines flying from Incheon Intl to Seattle

Discover the top 7 airlines that operate flights from Incheon Intl to Seattle. 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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$472Average$727FlexibilityNo cancel feeOn-time67%
Alaska AirlinesCheapest$488Average$572FlexibilityNo cancel feeOn-time75%
Korean AirCheapest$510Average$796FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$516Average$646FlexibilityNo cancel feeOn-time69%
Asiana AirlinesCheapest$533Average$720FlexibilityNo cancel feeOn-time76%
Hawaiian AirlinesCheapest$592Average$868FlexibilityNo cancel feeOn-time85%
DeltaCheapest$623Average$744FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.