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Cheap flights from Washington to Osaka from $320

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Osaka departing on 11/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Asiana Airlines Logo
12:10 am - 6:05 pmSEA-KIX
24h 55m1 stop
Asiana Airlines Logo
10:30 am - 1:55 pmKIX-SEA
20h 25m1 stop
$563Asiana Airlines
Find Deal
Mon, Nov 3 - Mon, Nov 10
Asiana Airlines Logo
12:10 am - 8:40 amSEA-KIX
15h 30m1 stop
Asiana Airlines Logo
9:00 am - 1:55 pmKIX-SEA
21h 55m1 stop
$564Asiana Airlines
Find Deal
Sun, Nov 2 - Sun, Nov 9
ANA Logo
3:45 pm - 10:15 amSEA-KIX
25h 30m1 stop
ANA Logo
3:45 pm - 1:20 pmKIX-SEA
14h 35m1 stop
$624ANA
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Wed, Feb 4 - Wed, Feb 11
ANA Logo
6:03 am - 6:15 pmSEA-KIX
19h 12m2 stops
ANA Logo
3:45 pm - 1:20 pmKIX-SEA
14h 35m1 stop
$628ANA
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Wed, Feb 4 - Wed, Feb 11
Japan Airlines Logo
6:00 am - 6:50 pmSEA-KIX
19h 50m1 stop
Japan Airlines Logo
8:00 am - 9:55 amKIX-SEA
18h 55m1 stop
$638Japan Airlines
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Tue, Jan 13 - Tue, Jan 20
United Airlines Logo
6:03 am - 4:40 pmSEA-KIX
17h 37m1 stop
United Airlines Logo
8:20 am - 1:20 pmKIX-SEA
22h 00m1 stop
$652United Airlines
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Sun, Jan 18 - Sat, Jan 31
United Airlines Logo
3:45 pm - 7:25 pmSEA-KIX
34h 40m1 stop
United Airlines Logo
8:20 am - 1:20 pmKIX-SEA
22h 00m1 stop
$654United Airlines
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Sat, Jan 17 - Fri, Jan 30
Alaska Airlines Logo
10:30 am - 6:45 pmPDX-KIX
39h 15m1 stop
Alaska Airlines Logo
8:45 pm - 9:05 pmKIX-PDX
17h 20m1 stop
$667Alaska Airlines
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Fri, Jan 23 - Wed, Feb 4
Japan Airlines Logo
7:15 am - 10:20 pmPDX-KIX
22h 05m2 stops
Japan Airlines Logo
8:00 am - 12:38 pmKIX-PDX
21h 38m2 stops
$714Japan Airlines
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Tue, Jan 6 - Wed, Feb 4
Alaska Airlines Logo
7:00 am - 6:45 pmPDX-KIX
18h 45m1 stop
Alaska Airlines Logo
8:45 pm - 9:05 pmKIX-PDX
17h 20m1 stop
$744Alaska Airlines
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Tue, Jan 20 - Tue, Feb 3

Asiana Airlines flights from State of Washington to Osaka Kansai Intl Airport

Our best Asiana Airlines deals on State of Washington to Osaka Kansai Intl Airport flight tickets
Asiana Airlines
Nov 3
SEA12:10 amSeattle/Tacoma Intl
24h 55m
1 stop
KIX6:05 pmOsaka Kansai Intl
Nov 10
KIX10:30 amOsaka Kansai Intl
20h 25m
1 stop
SEA1:55 pmSeattle/Tacoma Intl
$563
Find similar
Asiana Airlines
Nov 2
SEA12:10 amSeattle/Tacoma Intl
15h 30m
1 stop
KIX8:40 amOsaka Kansai Intl
Nov 9
KIX9:00 amOsaka Kansai Intl
21h 55m
1 stop
SEA1:55 pmSeattle/Tacoma Intl
$564
Find similar
Asiana Airlines
Oct 28
SEA12:10 amSeattle/Tacoma Intl
25h 55m
1 stop
KIX6:05 pmOsaka Kansai Intl
Nov 10
KIX9:00 amOsaka Kansai Intl
21h 55m
1 stop
SEA1:55 pmSeattle/Tacoma Intl
$612
Find similar

ANA flights from State of Washington to Osaka Kansai Intl Airport

Our best ANA deals on State of Washington to Osaka Kansai Intl Airport flight tickets
ANA
Feb 4
SEA3:45 pmSeattle/Tacoma Intl
25h 30m
1 stop
KIX10:15 amOsaka Kansai Intl
Feb 11
KIX3:45 pmOsaka Kansai Intl
14h 35m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$624
Find similar
ANA
Feb 4
SEA6:03 amSeattle/Tacoma Intl
19h 12m
2 stops
KIX6:15 pmOsaka Kansai Intl
Feb 11
KIX3:45 pmOsaka Kansai Intl
14h 35m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$628
Find similar
ANA
Feb 7
SEA3:45 pmSeattle/Tacoma Intl
23h 50m
1 stop
KIX8:35 amOsaka Kansai Intl
Feb 14
KIX3:45 pmOsaka Kansai Intl
14h 35m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$639
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington to Osaka Kansai Intl Airport 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, momondo users made 832,500 searches. Data last updated October 16, 2025.
Use the filters below to find and compare flights from Washington to Osaka Kansai Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Mon 11/3

12:10 am-6:05 pm

1 stop24h 55m

Osaka Kansai Intl

Mon 11/10

10:30 am-1:55 pm

1 stop20h 25m

$563

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sun 11/2

12:10 am-8:40 am

1 stop15h 30m

Osaka Kansai Intl

Sun 11/9

9:00 am-1:55 pm

1 stop21h 55m

$564

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Wed 2/4

3:45 pm-10:15 am

1 stop25h 30m

Osaka Kansai Intl

Wed 2/11

3:45 pm-1:20 pm

1 stop14h 35m

$624

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Wed 2/4

6:03 am-6:15 pm

2 stops19h 12m

Osaka Kansai Intl

Wed 2/11

3:45 pm-1:20 pm

1 stop14h 35m

$628

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Tue 1/13

6:00 am-6:50 pm

1 stop19h 50m

Osaka Kansai Intl

Tue 1/20

8:00 am-9:55 am

1 stop18h 55m

$638

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sun 1/18

6:03 am-4:40 pm

1 stop17h 37m

Osaka Kansai Intl

Sat 1/31

8:20 am-1:20 pm

1 stop22h 00m

$652

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sat 1/17

3:45 pm-7:25 pm

1 stop34h 40m

Osaka Kansai Intl

Fri 1/30

8:20 am-1:20 pm

1 stop22h 00m

$654

PortlandOsaka

PDX - KIX

PDXKIX

Portland

Fri 1/23

10:30 am-6:45 pm

1 stop39h 15m

Osaka Kansai Intl

Wed 2/4

8:45 pm-9:05 pm

1 stop17h 20m

$667

PortlandOsaka

PDX - KIX

PDXKIX

Portland

Tue 1/6

7:15 am-10:20 pm

2 stops22h 05m

Osaka Kansai Intl

Wed 2/4

8:00 am-12:38 pm

2 stops21h 38m

$714

PortlandOsaka

PDX - KIX

PDXKIX

Portland

Tue 1/20

7:00 am-6:45 pm

1 stop18h 45m

Osaka Kansai Intl

Tue 2/3

8:45 pm-9:05 pm

1 stop17h 20m

$744

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from State of Washington to Osaka Kansai Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Osaka Kansai Intl Airport?

In general, September is the cheapest month to fly from State of Washington to Osaka Kansai Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $783. If you aren’t able to travel during the month of September, then book flights to Osaka Kansai Intl Airport from State of Washington during February instead. Flights to Osaka Kansai Intl Airport in February, while not as cheap as those in September, still average around $786.

What is the cheapest day to depart on your flight to Osaka Kansai Intl Airport?

The cheapest day to depart from State of Washington to Osaka Kansai Intl Airport is on a Thursday. Travelers who choose to depart for Osaka Kansai Intl Airport on a Thursday will often find tickets for as low as $999. Flights from State of Washington to Osaka Kansai Intl Airport on a Sunday will generally be more expensive and average around $1,405. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Osaka Kansai Intl Airport?

Our data shows that the cheapest State of Washington to Osaka Kansai Intl Airport flights are usually those with departure times in the morning. Our users have found flights to Osaka Kansai Intl Airport in the morning for as low as $1,065. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $1,566 on average. Flights to Osaka Kansai Intl Airport from State of Washington in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Osaka Kansai Intl Airport?

You are more likely to see cheaper flights to Osaka Kansai Intl Airport from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to Osaka Kansai Intl Airport for around $971 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Osaka Kansai Intl Airport from State of Washington for as low as $799 on momondo.

Cheap State of Washington to Osaka Kansai Intl Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Osaka Kansai Intl Airport

Direct flights

None
There are no direct flights from State of Washington to Osaka Kansai Intl Airport. There are no popular flight routes from State of Washington to Osaka Kansai Intl Airport.
Search flight deals

  • When did momondo last update prices for flights from Washington to Osaka Kansai Intl Airport?

    Prices for flights from Washington to Osaka Kansai Intl Airport were last updated today.

  • How many operators does momondo search for flights from Washington to Osaka Kansai Intl Airport?

  • How old do you have to be to fly from Washington to Osaka Kansai Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington to Osaka Kansai Intl Airport.

  • What documentation or ID do you need to fly to Osaka Kansai Intl Airport?

    The required travel and health documents for your Osaka Kansai Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Osaka Kansai Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from State of Washington to Osaka Kansai Intl Airport

Compare and see reviews for airlines that fly from State of Washington to Osaka Kansai Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
Asiana AirlinesPriceFrom $610Free CancellationRating
8.2
486 reviews
Search Asiana Airlines flights
DeltaPriceFrom $649Free CancellationRating
7.9
7,982 reviews
Search Delta flights
ANAPriceFrom $666Free CancellationRating
8.4
986 reviews
Search ANA flights
Air CanadaPriceFrom $669Free CancellationRating
7.1
10,307 reviews
Search Air Canada flights
Korean AirPriceFrom $716Free CancellationRating
8.4
1,149 reviews
Search Korean Air flights
China EasternPriceFrom $719Free CancellationRating
7.2
169 reviews
Search China Eastern flights
United AirlinesPriceFrom $734Free CancellationRating
7.4
8,982 reviews
Search United Airlines flights
STARLUX AirlinesPriceFrom $975Free CancellationRating
8.9
219 reviews
Search STARLUX Airlines flights
EVA AirPriceFrom $1,033Free CancellationRating
8.4
1,251 reviews
Search EVA Air flights
China AirlinesPriceFrom $1,047Free CancellationRating
8.3
768 reviews
Search China Airlines flights

Traveling to a place near Osaka?

Book flights to Osaka if you plan to visit one of these locations
Nara
Himeji
Izumisano
Nishinomiya

Why use momondo?

Why should I use momondo to find a flight deal from Washington to Osaka?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington to Osaka for you.

Can I find flights from Washington to Osaka with flexible booking policies on momondo?

Yes. All flights to Osaka from Washington on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Washington to Osaka?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Washington to Osaka.

I’m not ready to book a flight from Washington to Osaka right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Osaka, momondo offers a useful price alert feature which will track prices for flights to Osaka from Washington and alert you when they change.

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