$359 Cheap Flights from Portland (PDX) to Kumamoto (KMJ)

View $359 flight on Wed, Feb 4, 2026Opens in a new window

Popular airlines from Portland International Airport (PDX) to Kumamoto Airport (KMJ)

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Cheap Flights from Portland to Kumamoto (PDX-KMJ)

Prices were available within the past 7 days and start at $359 for one-way flights and $654 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Wed, Feb 4 - Wed, Feb 25
PDX
Portland
KMJ
Kumamoto
$654 Roundtrip, found 6 days ago
$654
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Wed, Feb 4 from Portland to Kumamoto, returning Wed, Feb 25, priced at $654 found 6 days ago
Japan Airlines
Wed, Feb 4 - Wed, Feb 25
PDX
Portland
KMJ
Kumamoto
$654 Roundtrip, found 6 days ago
$654
Roundtrip
found 6 days ago
Select Japan Airlines flight, departing Wed, Feb 4 from Portland to Kumamoto, returning Wed, Feb 25, priced at $654 found 6 days ago
Alaska Airlines
Wed, Feb 4 - Wed, Feb 25
PDX
Portland
KMJ
Kumamoto
$662 Roundtrip, found 6 days ago
$662
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Wed, Feb 4 from Portland to Kumamoto, returning Wed, Feb 25, priced at $662 found 6 days ago
All Nippon Airways
Wed, Feb 4 - Wed, Feb 25
PDX
Portland
KMJ
Kumamoto
$662 Roundtrip, found 6 days ago
$662
Roundtrip
found 6 days ago
Select All Nippon Airways flight, departing Wed, Feb 4 from Portland to Kumamoto, returning Wed, Feb 25, priced at $662 found 6 days ago
All Nippon Airways
Wed, Feb 4 - Wed, Feb 25
PDX
Portland
KMJ
Kumamoto
$668 Roundtrip, found 6 days ago
$668
Roundtrip
found 6 days ago
Select All Nippon Airways flight, departing Wed, Feb 4 from Portland to Kumamoto, returning Wed, Feb 25, priced at $668 found 6 days ago
Alaska Airlines
Mon, Nov 24 - Mon, Dec 8
PDX
Portland
KMJ
Kumamoto
$698 Roundtrip, found 1 day ago
$698
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Mon, Nov 24 from Portland to Kumamoto, returning Mon, Dec 8, priced at $698 found 1 day ago
Japan Airlines
Mon, Nov 17 - Thu, Dec 4
PDX
Portland
KMJ
Kumamoto
$700 Roundtrip, found 1 day ago
$700
Roundtrip
found 1 day ago
Select Japan Airlines flight, departing Mon, Nov 17 from Portland to Kumamoto, returning Thu, Dec 4, priced at $700 found 1 day ago
Alaska Airlines
Mon, Nov 24 - Mon, Dec 8
PDX
Portland
KMJ
Kumamoto
$700 Roundtrip, found 1 day ago
$700
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Mon, Nov 24 from Portland to Kumamoto, returning Mon, Dec 8, priced at $700 found 1 day ago
STARLUX Airlines
Wed, Feb 4 - Wed, Feb 25
PDX
Portland
KMJ
Kumamoto
$976 Roundtrip, found 6 days ago
$976
Roundtrip
found 6 days ago
Select STARLUX Airlines flight, departing Wed, Feb 4 from Portland to Kumamoto, returning Wed, Feb 25, priced at $976 found 6 days ago
American Airlines
Sat, Nov 1 - Sat, Nov 8
PDX
Portland
KMJ
Kumamoto
$2,141 Roundtrip, found 1 day ago
$2,141
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Nov 1 from Portland to Kumamoto, returning Sat, Nov 8, priced at $2,141 found 1 day ago

Frequently asked questions

How much does a flight from Portland Intl. Airport (PDX) to Kumamoto Airport (KMJ) cost?
Lock in a cheap one-way flight from $359 or cheap return flight from $654 from Portland Intl. Airport (PDX) to Kumamoto Airport (KMJ) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Portland Intl. Airport (PDX) to Kumamoto Airport (KMJ)?
Planning your trip for February may help you find better deals, as it's the cheapest month for flights between PDX and KMJ. You'll typically find the lowest fares during off-peak months.
What is the cheapest airline that flies from Portland Intl. Airport (PDX) to Kumamoto Airport (KMJ)?
Expedia's filter tool lets you easily compare airlines, flight times and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest PDX to KMJ flight.
How many flights per day from Portland Intl. Airport (PDX) to Kumamoto Airport (KMJ)?
You'll have to book a flight with a layover if you're traveling from Portland Intl. Airport (PDX) to Kumamoto Airport (KMJ). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from PDX to KMJ?
Typically you'll find the widest variety of flight choices on a Friday. Tuesdays are often the quietest.* However, this can change 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 Portland Intl. Airport (PDX) to Kumamoto Airport (KMJ)?
To avoid possible delays on the Portland Intl. Airport (PDX) to Kumamoto Airport (KMJ) route, aim to fly before 3 PM. Later departures are 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 Portland Intl. Airport (PDX) to Kumamoto Airport (KMJ) last-minute?
Last-minute bookings from PDX to KMJ are usually more expensive. To lock in the best rates, start searching for flights well ahead of time. That said, if you're flexible with your travel dates, you may land a cheap ticket right before your trip.
Is it cheaper to book a PDX to KMJ flight and hotel package?
Securing a PDX to KMJ flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Pick from our extensive range of accommodations and then add car rentals, activities and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Portland Intl. Airport (PDX) to Kumamoto Airport (KMJ)?
It's usually possible to cancel or reschedule your PDX to KMJ flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Travel information

Origin airport
Portland Intl.
Destination airport
Kumamoto
Airlines serving
All Nippon Airways, American Airlines, Hawaiian Airlines, Japan Airlines, STARLUX Airlines
Roundtrip price
$653
Distance
5340 mi

Book with confidence

Book with confidence

Portland to Kumamoto Flights

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

 

The best time to book a flight from Portland to Kumamoto

Sunday is one of the best days to book for cheap flights from Portland 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 Portland 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 Portland to Kumamoto in 2025. You can also book with separate airlines for your outbound and return journeys, from $359 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 Portland 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 Portland 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.

 

Portland to Kumamoto Flights

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*Available to One Key members.