$523 Cheap Flights from Kumamoto (KMJ) to Seattle (SEA)

View $523 flight on Tue, Sep 16, 2025Opens in a new window

Popular airlines from Kumamoto Airport (KMJ) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Kumamoto to Seattle (KMJ-SEA)

Prices were available within the past 7 days and start at $523 for one-way flights and $870 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

STARLUX Airlines
Fri, Sep 26 - Wed, Oct 1
KMJ
Kumamoto
SEA
Seattle
$870 Roundtrip, found 1 day ago
$870
Roundtrip
found 1 day ago
Select STARLUX Airlines flight, departing Fri, Sep 26 from Kumamoto to Seattle, returning Wed, Oct 1, priced at $870 found 1 day ago
Asiana Airlines
Sat, Sep 13 - Wed, Sep 17
KMJ
Kumamoto
SEA
Seattle
$951 Roundtrip, found 1 day ago
$951
Roundtrip
found 1 day ago
Select Asiana Airlines flight, departing Sat, Sep 13 from Kumamoto to Seattle, returning Wed, Sep 17, priced at $951 found 1 day ago
Asiana Airlines
Sat, Sep 13 - Wed, Sep 17
KMJ
Kumamoto
SEA
Seattle
$959 Roundtrip, found 1 day ago
$959
Roundtrip
found 1 day ago
Select Asiana Airlines flight, departing Sat, Sep 13 from Kumamoto to Seattle, returning Wed, Sep 17, priced at $959 found 1 day ago
China Airlines
Fri, Sep 26 - Wed, Oct 1
KMJ
Kumamoto
SEA
Seattle
$1,002 Roundtrip, found 1 day ago
$1,002
Roundtrip
found 1 day ago
Select China Airlines flight, departing Fri, Sep 26 from Kumamoto to Seattle, returning Wed, Oct 1, priced at $1,002 found 1 day ago
Asiana Airlines
Sat, Sep 13 - Wed, Sep 17
KMJ
Kumamoto
SEA
Seattle
$1,054 Roundtrip, found 1 day ago
$1,054
Roundtrip
found 1 day ago
Select Asiana Airlines flight, departing Sat, Sep 13 from Kumamoto to Seattle, returning Wed, Sep 17, priced at $1,054 found 1 day ago
China Airlines
Fri, Sep 26 - Wed, Oct 1
KMJ
Kumamoto
SEA
Seattle
$1,076 Roundtrip, found 1 day ago
$1,076
Roundtrip
found 1 day ago
Select China Airlines flight, departing Fri, Sep 26 from Kumamoto to Seattle, returning Wed, Oct 1, priced at $1,076 found 1 day ago
Asiana Airlines
Sat, Sep 13 - Wed, Sep 17
KMJ
Kumamoto
SEA
Seattle
$1,082 Roundtrip, found 1 day ago
$1,082
Roundtrip
found 1 day ago
Select Asiana Airlines flight, departing Sat, Sep 13 from Kumamoto to Seattle, returning Wed, Sep 17, priced at $1,082 found 1 day ago
STARLUX Airlines
Sat, Sep 13 - Wed, Sep 17
KMJ
Kumamoto
SEA
Seattle
$1,096 Roundtrip, found 1 day ago
$1,096
Roundtrip
found 1 day ago
Select STARLUX Airlines flight, departing Sat, Sep 13 from Kumamoto to Seattle, returning Wed, Sep 17, priced at $1,096 found 1 day ago
Japan Airlines
Fri, Sep 26 - Wed, Oct 1
KMJ
Kumamoto
SEA
Seattle
$1,210 Roundtrip, found 1 day ago
$1,210
Roundtrip
found 1 day ago
Select Japan Airlines flight, departing Fri, Sep 26 from Kumamoto to Seattle, returning Wed, Oct 1, priced at $1,210 found 1 day ago
All Nippon Airways
Sat, Sep 13 - Wed, Sep 17
KMJ
Kumamoto
SEA
Seattle
$2,090 Roundtrip, found 1 day ago
$2,090
Roundtrip
found 1 day ago
Select All Nippon Airways flight, departing Sat, Sep 13 from Kumamoto to Seattle, returning Wed, Sep 17, priced at $2,090 found 1 day ago
Flights from Kumamoto (KMJ) to Seattle (SEA)
Origin airport
Kumamoto
Destination airport
Seattle - Tacoma Intl.
Airlines serving
All Nippon Airways, Japan Airlines, STARLUX Airlines
Roundtrip price
$870
Distance
5279 mi

Kumamoto to Seattle Flights

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

 

The best time to book a flight from Kumamoto to Seattle

Sunday is one of the best days to book for cheap flights from Kumamoto 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 Kumamoto 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 Kumamoto to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $523 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 Kumamoto 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 Kumamoto 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 Kumamoto Airport (KMJ) to Seattle - Tacoma Intl. Airport (SEA) cost?
Lock in a cheap one-way flight from $523 or cheap return flight from $870 from Kumamoto Airport (KMJ) to Seattle - Tacoma Intl. Airport (SEA) 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 Kumamoto Airport (KMJ) to Seattle - Tacoma Intl. Airport (SEA)?
The cheapest month to fly from KMJ to SEA is September, when there's less demand. Off-peak months are often when better flight deals are available between these airports.
What is the cheapest airline that flies from Kumamoto Airport (KMJ) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline flying from KMJ to SEA, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Kumamoto Airport (KMJ) to Seattle - Tacoma Intl. Airport (SEA)?
You'll have to take a flight with a layover when traveling from Kumamoto Airport (KMJ) to Seattle - Tacoma Intl. Airport (SEA). Direct flights don't operate daily on this route. However, simply filter your search to include one or more stops to find the best option for your trip.
What day of the week has the most flights from KMJ to SEA?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Kumamoto Airport (KMJ) to Seattle - Tacoma Intl. Airport (SEA)?
Opt for a flight from Kumamoto Airport (KMJ) to Seattle - Tacoma Intl. Airport (SEA) that leaves before 3 PM to reduce the risk of delays and cancellations. Departures after this hour are on average 22% more likely to be canceled.**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.
Is it cheaper to buy a plane ticket from Kumamoto Airport (KMJ) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Booking your ticket from KMJ to SEA right before your trip is typically more expensive. However, if you're flexible with your itinerary, you could grab a cheap last-minute fare.
Is it cheaper to book a KMJ to SEA flight and hotel package?
Compared with arranging flights and hotels separately, booking a KMJ to SEA flight and hotel package with Expedia could lead to significant savings. Better yet, having it all in one place takes the hassle out of planning your trip. Just secure your flights and choose from our extensive range of hotels, then personalize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Kumamoto Airport (KMJ) to Seattle - Tacoma Intl. Airport (SEA)?
If you reserved your KMJ to SEA 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 ticket you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you want more information.

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*Available to One Key members.