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Cheap flights from Incheon Intl Airport to Seattle from £373

ICN — SEA
5 Oct — 12 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Incheon Intl to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Incheon Intl to Seattle

Mon 16/1120:00 -
Nonstop9h 55m
Sun 22/1112:40 -
Nonstop11h 55m
Deal found 31/8£632
Wed 16/1220:30 -
1 stop39h 00m
Sun 10/121:30 -
1 stop21h 30m
Deal found 2/9£657
Fri 2/1007:20 -
1 stop28h 45m
Sun 11/1023:10 -
1 stop28h 05m
Deal found 2/9£657
Sun 20/1220:30 -
1 stop39h 00m
Fri 8/121:30 -
1 stop39h 35m
Deal found 5/9£662
Mon 19/1020:30 -
1 stop39h 35m
Mon 26/1022:30 -
1 stop28h 40m
Deal found 4/9£663
Sun 15/1120:00 -
Nonstop9h 55m
Sun 22/1112:40 -
Nonstop11h 55m
Deal found 31/8£672
Tue 22/1220:30 -
1 stop39h 00m
Fri 1/121:30 -
1 stop39h 35m
Deal found 1/9£675
Sat 26/920:30 -
1 stop39h 35m
Tue 6/1023:10 -
1 stop28h 05m
Deal found 1/9£676
Sat 19/920:30 -
1 stop39h 35m
Wed 30/923:10 -
1 stop38h 50m
Deal found 3/9£679
Wed 23/919:35 -
Nonstop10h 05m
Sun 4/1013:35 -
Nonstop11h 55m
Deal found 31/8£680
Sun 20/1220:30 -
1 stop39h 00m
Sun 27/1221:30 -
1 stop39h 35m
Deal found 4/9£685

Find flight deals from Incheon Intl to Seattle

Round-trip from

£632

One-way from

£373

Popular in

June

Cheapest in

November

Average price

£506

Good one-way deal

£625 or less
Alaska Airlines
  • Alaska Airlines
  • 16/11-22/11
  • Nonstop
  • 21h 50m total
  • Incheon to Seattle
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Philippine Airlines
  • Philippine Airlines
  • 8/11-31/12
  • 1 total stop
  • 39h 00m total
  • Incheon to Seattle
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (£111 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return price).
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Average for round-trip flights in September 2026
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Price to beat on a one-way flight from Incheon Intl to Seattle/Tacoma Intl.
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Incheon Intl Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

IncheonSeattle

ICN Incheon Intl - SEA Seattle/Tacoma Intl

ICNSEA

Incheon Intl

Mon 19/10

20:30-20:05

1 stop39h 35m

Seattle/Tacoma Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£373

IncheonSeattle

ICN Incheon Intl - SEA Seattle/Tacoma Intl

ICNSEA

Incheon Intl

Thu 1/10

20:30-20:05

1 stop39h 35m

Seattle/Tacoma Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£374

IncheonSeattle

ICN Incheon Intl - SEA Seattle/Tacoma Intl

ICNSEA

Incheon Intl

Sun 25/10

07:30-19:30

1 stop28h 00m

Seattle/Tacoma Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£376

IncheonSeattle

ICN Incheon Intl - SEA Seattle/Tacoma Intl

ICNSEA

Incheon Intl

Thu 4/3

13:30-18:30

1 stop22h 00m

Seattle/Tacoma Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£377
Fastest return journey

IncheonSeattle

ICN Incheon Intl - SEA Seattle/Tacoma Intl

ICNSEA

Incheon Intl

Thu 29/10

21:00-14:55

Nonstop9h 55m

Seattle/Tacoma Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£603

IncheonSeattle

ICN Incheon Intl - SEA Seattle/Tacoma Intl

ICNSEA

Incheon Intl

Tue 3/11

21:00-13:55

Nonstop9h 55m

Seattle/Tacoma Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£603

IncheonSeattle

ICN Incheon Intl - SEA Seattle/Tacoma Intl

ICNSEA

Incheon Intl

Fri 4/12

21:00-13:55

Nonstop9h 55m

Seattle/Tacoma Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£605

IncheonSeattle

ICN Incheon Intl - SEA Seattle/Tacoma Intl

ICNSEA

Incheon Intl

Wed 23/9

11:30-21:15

3 stops25h 45m

Seattle/Tacoma Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£611

IncheonSeattle

ICN Incheon Intl - SEA Seattle/Tacoma Intl

ICNSEA

Incheon Intl

Tue 15/12

12:45-21:21

3 stops25h 36m

Seattle/Tacoma Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£619

IncheonSeattle

ICN Incheon Intl - SEA Seattle/Tacoma Intl

ICNSEA

Incheon Intl

Mon 19/10

16:40-10:40

Nonstop10h 00m

Seattle/Tacoma Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£620

Flights are sorted by cheapest return flights first.

Deals found on 2/9

Showing 1-10 of 22 resultsSorted by cheapest first
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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 return price

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?

To ensure you get the cheapest price possible for a flight from Incheon Intl Airport to Seattle, you should look to book at least 24 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, November is the cheapest month in which you can book a flight from Incheon Intl Airport to Seattle (average of £418). Flying from Incheon Intl Airport to Seattle in June is currently the most expensive (average of £816). 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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Incheon Intl Airport to Seattle as you normally would.

How much does it cost for a return flight from Incheon Intl Airport to Seattle?

Airfare is typical for this route at the moment.

Incheon Intl Airport to Seattle flights typically cost between £332 and £637 in November.
The cheapest return price found within the last 5 days was £632 on Alaska Airlines (16 Nov–22 Nov).

Related info for your journey

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

    If you book a flight to Seattle from Incheon Intl, you will be flying to Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 7 flights from Incheon Intl to Seattle/Tacoma Intl per day from 0 different airlines.

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

    A quick flight from Incheon Intl Airport to Seattle can take about 10h. Philippine Airlines provides one of the quickest options available for as low as £743. The distance from Incheon Intl Airport to Seattle is about 5200 mi. Both multi-stop and direct flights can be found to your destination and back.

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

    The top 3 most reliable airlines when flying from Incheon Intl Airport to Seattle are Delta (75%), Korean Air (75%) and Alaska Airlines (56%).

  • 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 holiday 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, November is the cheapest month in which you can book a flight from Incheon Intl Airport to Seattle (average of £418). Flying from Incheon Intl Airport to Seattle in June is currently the most expensive (average of £816). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Federal Way
SeaTac

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