$653 Cheap Flights from Washington (IAD) to Kumamoto (KMJ)

View $653 flight on Sat, Mar 21, 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Kumamoto Airport (KMJ)

Cheap Flights from Washington to Kumamoto (IAD-KMJ)

Prices were available within the past 7 days and start at $653 for one-way flights and $1,587 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Asiana Airlines
Tue, Oct 7 - Sat, Oct 18
IAD
Washington
KMJ
Kumamoto
$1,587 Roundtrip, found 5 hours ago
$1,587
Roundtrip
found 5 hours ago
Select Asiana Airlines flight, departing Tue, Oct 7 from Washington to Kumamoto, returning Sat, Oct 18, priced at $1,587 found 5 hours ago
Asiana Airlines
Tue, Oct 7 - Sat, Oct 18
IAD
Washington
KMJ
Kumamoto
$1,625 Roundtrip, found 5 hours ago
$1,625
Roundtrip
found 5 hours ago
Select Asiana Airlines flight, departing Tue, Oct 7 from Washington to Kumamoto, returning Sat, Oct 18, priced at $1,625 found 5 hours ago
United
Tue, Oct 7 - Sat, Oct 18
IAD
Washington
KMJ
Kumamoto
$1,646 Roundtrip, found 5 hours ago
$1,646
Roundtrip
found 5 hours ago
Select United flight, departing Tue, Oct 7 from Washington to Kumamoto, returning Sat, Oct 18, priced at $1,646 found 5 hours ago
United
Tue, Oct 7 - Sat, Oct 18
IAD
Washington
KMJ
Kumamoto
$1,651 Roundtrip, found 5 hours ago
$1,651
Roundtrip
found 5 hours ago
Select United flight, departing Tue, Oct 7 from Washington to Kumamoto, returning Sat, Oct 18, priced at $1,651 found 5 hours ago
United
Tue, Oct 7 - Sat, Oct 18
IAD
Washington
KMJ
Kumamoto
$1,656 Roundtrip, found 5 hours ago
$1,656
Roundtrip
found 5 hours ago
Select United flight, departing Tue, Oct 7 from Washington to Kumamoto, returning Sat, Oct 18, priced at $1,656 found 5 hours ago
United
Tue, Oct 7 - Sat, Oct 18
IAD
Washington
KMJ
Kumamoto
$1,661 Roundtrip, found 5 hours ago
$1,661
Roundtrip
found 5 hours ago
Select United flight, departing Tue, Oct 7 from Washington to Kumamoto, returning Sat, Oct 18, priced at $1,661 found 5 hours ago
All Nippon Airways
Tue, Oct 7 - Sat, Oct 18
IAD
Washington
KMJ
Kumamoto
$1,662 Roundtrip, found 5 hours ago
$1,662
Roundtrip
found 5 hours ago
Select All Nippon Airways flight, departing Tue, Oct 7 from Washington to Kumamoto, returning Sat, Oct 18, priced at $1,662 found 5 hours ago
All Nippon Airways
Tue, Oct 7 - Sat, Oct 18
IAD
Washington
KMJ
Kumamoto
$1,667 Roundtrip, found 5 hours ago
$1,667
Roundtrip
found 5 hours ago
Select All Nippon Airways flight, departing Tue, Oct 7 from Washington to Kumamoto, returning Sat, Oct 18, priced at $1,667 found 5 hours ago
American Airlines
Tue, Oct 7 - Sat, Oct 18
IAD
Washington
KMJ
Kumamoto
$1,726 Roundtrip, found 5 hours ago
$1,726
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Tue, Oct 7 from Washington to Kumamoto, returning Sat, Oct 18, priced at $1,726 found 5 hours ago
Alaska Airlines
Tue, Oct 7 - Sat, Oct 18
IAD
Washington
KMJ
Kumamoto
$1,770 Roundtrip, found 5 hours ago
$1,770
Roundtrip
found 5 hours ago
Select Alaska Airlines flight, departing Tue, Oct 7 from Washington to Kumamoto, returning Sat, Oct 18, priced at $1,770 found 5 hours ago

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Kumamoto Airport (KMJ) cost?
Secure a cheap one-way flight from $653 or cheap return flight from $1,587 from Washington Dulles Intl. Airport (IAD) to Kumamoto Airport (KMJ) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Kumamoto Airport (KMJ)?
Flying in October is a great way to save, as it's the cheapest month for flights between IAD and KMJ. You'll usually find the lowest fares during off-peak months.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Kumamoto Airport (KMJ)?
To find the cheapest airline flying from IAD to KMJ, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Kumamoto Airport (KMJ)?
Direct flights from Washington Dulles Intl. Airport (IAD) to Kumamoto Airport (KMJ) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from IAD to KMJ?
Typically you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Kumamoto Airport (KMJ)?
Select a flight from Washington Dulles Intl. Airport (IAD) to Kumamoto Airport (KMJ) that takes off before 3 PM to reduce the likelihood of delays. Departures after this hour have a 22% higher chance of being canceled, on average.**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 Washington Dulles Intl. Airport (IAD) to Kumamoto Airport (KMJ) last-minute?
Booking your plane ticket from IAD to KMJ right before your getaway is generally more expensive. However, if you're flexible with your departure times and dates, you could snag a cheap last-minute fare.
Is it cheaper to book an IAD to KMJ flight and hotel package?
Compared with arranging hotels and flights separately, booking an IAD to KMJ flight and hotel package with Expedia could result in significant savings. What's more, having everything in one convenient place takes the hassle out of planning your trip. Simply pick your flights and choose from our extensive range of stays, then personalize your trip with other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Kumamoto Airport (KMJ)?
In most instances, you can modify or cancel your IAD to KMJ flight. However, additional fees may apply, especially if you made your booking more than 24 hours ago. Double-check your itinerary for the airline's fees and guidelines on flight changes, or if you want more details, visit our Customer Service portal.

Travel information

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Kumamoto
Airlines serving
All Nippon Airways, American Airlines, Asiana Airlines, Japan Airlines, Lufthansa, Qatar Airways, Turkish Airlines
Roundtrip price
$1,587
Distance
7154 mi

Book with confidence

Book with confidence

Washington to Kumamoto Flights

The cheapest times to fly from Washington to Kumamoto

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

 

The best time to book a flight from Washington to Kumamoto

Sunday is one of the best days to book for cheap flights from Washington to Kumamoto: 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 Washington to Kumamoto

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 Washington to Kumamoto in 2025. You can also book with separate airlines for your outbound and return journeys, from $653 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 Washington to Kumamoto 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 Washington to Kumamoto 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.

 

Washington to Kumamoto Flights

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*Available to One Key members.