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Cheap flights from Washington to Osaka from $306

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 9/14. 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

Asiana Airlines Logo
2:15 pm - 5:50 pmSEA-KIX
35h 35m1 stop
Asiana Airlines Logo
9:10 am - 12:30 pmKIX-SEA
19h 20m1 stop
$591Asiana Airlines
Find Deal
Mon, Sep 15 - Mon, Sep 29
Asiana Airlines Logo
2:15 pm - 9:40 amSEA-KIX
27h 25m1 stop
Asiana Airlines Logo
9:10 am - 12:30 pmKIX-SEA
19h 20m1 stop
$599Asiana Airlines
Find Deal
Sun, Sep 7 - Mon, Sep 22
United Airlines Logo
7:00 am - 2:50 pmSEA-KIX
15h 50m1 stop
United Airlines Logo
8:30 am - 2:25 pmKIX-SEA
21h 55m1 stop
$604United Airlines
Find Deal
Mon, Sep 15 - Wed, Oct 1
ANA Logo
7:00 am - 2:50 pmSEA-KIX
15h 50m1 stop
ANA Logo
5:30 pm - 2:25 pmKIX-SEA
12h 55m1 stop
$608ANA
Find Deal
Tue, Sep 16 - Tue, Sep 30
Korean Air Logo
1:32 pm - 10:45 amSEA-KIX
52h 13m2 stops
Korean Air Logo
6:10 pm - 9:00 amKIX-SEA
31h 50m1 stop
$614Korean Air
Find Deal
Sat, Dec 6 - Mon, Dec 15
ANA Logo
4:40 pm - 10:20 pmSEA-KIX
13h 40m1 stop
ANA Logo
6:50 am - 1:20 pmKIX-SEA
23h 30m1 stop
$615ANA
Find Deal
Tue, Oct 28 - Fri, Nov 7
Air Canada Logo
10:00 am - 4:25 pmPDX-KIX
14h 25m1 stop
Air Canada Logo
6:05 pm - 6:46 pmKIX-PDX
16h 41m1 stop
$633Air Canada
Find Deal
Wed, Sep 3 - Tue, Sep 16
Air Canada Logo
7:40 pm - 4:25 pmPDX-KIX
28h 45m1 stop
Air Canada Logo
6:05 pm - 11:01 pmKIX-PDX
20h 56m1 stop
$635Air Canada
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Sun, Aug 31 - Sat, Sep 13
United Airlines Logo
7:00 am - 2:50 pmSEA-KIX
15h 50m1 stop
United Airlines Logo
8:30 am - 2:25 pmKIX-SEA
21h 55m1 stop
$637United Airlines
Find Deal
Tue, Sep 23 - Tue, Oct 7
Korean Air Logo
5:40 pm - 9:00 pmSEA-KIX
35h 20m2 stops
Korean Air Logo
12:35 pm - 4:00 pmKIX-SEA
19h 25m2 stops
$670Korean Air
Find Deal
Tue, Aug 26 - Wed, Sep 3

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

Our best United Airlines deals on State of Washington to Osaka Kansai Intl Airport flight tickets
United Airlines
Sep 15
SEA7:00 amSeattle/Tacoma Intl
15h 50m
1 stop
KIX2:50 pmOsaka Kansai Intl
Oct 1
KIX8:30 amOsaka Kansai Intl
21h 55m
1 stop
SEA2:25 pmSeattle/Tacoma Intl
$604
Find similar
United Airlines
Sep 23
SEA7:00 amSeattle/Tacoma Intl
15h 50m
1 stop
KIX2:50 pmOsaka Kansai Intl
Oct 7
KIX8:30 amOsaka Kansai Intl
21h 55m
1 stop
SEA2:25 pmSeattle/Tacoma Intl
$637
Find similar
United Airlines
Sep 7
SEA7:00 amSeattle/Tacoma Intl
15h 50m
1 stop
KIX2:50 pmOsaka Kansai Intl
Sep 18
KIX4:50 pmOsaka Kansai Intl
22h 09m
1 stop
SEA10:59 pmSeattle/Tacoma Intl
$645
Find similar

Korean Air flights from State of Washington to Osaka Kansai Intl Airport

Our best Korean Air deals on State of Washington to Osaka Kansai Intl Airport flight tickets
Korean Air
Dec 6
SEA1:32 pmSeattle/Tacoma Intl
52h 13m
2 stops
KIX10:45 amOsaka Kansai Intl
Dec 15
KIX6:10 pmOsaka Kansai Intl
31h 50m
1 stop
SEA9:00 amSeattle/Tacoma Intl
$614
Find similar
Korean Air
Aug 26
SEA5:40 pmSeattle/Tacoma Intl
35h 20m
2 stops
KIX9:00 pmOsaka Kansai Intl
Sep 3
KIX12:35 pmOsaka Kansai Intl
19h 25m
2 stops
SEA4:00 pmSeattle/Tacoma Intl
$670
Find similar
Korean Air
Aug 25
PDX11:14 amPortland
17h 46m
2 stops
KIX9:00 pmOsaka Kansai Intl
Feb 1
KIX11:55 amOsaka Kansai Intl
18h 19m
2 stops
PDX1:14 pmPortland
$725
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 August 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 9/15

2:15 pm-5:50 pm

1 stop35h 35m

Osaka Kansai Intl

Mon 9/29

9:10 am-12:30 pm

1 stop19h 20m

$591

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sun 9/7

2:15 pm-9:40 am

1 stop27h 25m

Osaka Kansai Intl

Mon 9/22

9:10 am-12:30 pm

1 stop19h 20m

$599

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Mon 9/15

7:00 am-2:50 pm

1 stop15h 50m

Osaka Kansai Intl

Wed 10/1

8:30 am-2:25 pm

1 stop21h 55m

$604

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Tue 9/16

7:00 am-2:50 pm

1 stop15h 50m

Osaka Kansai Intl

Tue 9/30

5:30 pm-2:25 pm

1 stop12h 55m

$608

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sat 12/6

1:32 pm-10:45 am

2 stops52h 13m

Osaka Kansai Intl

Mon 12/15

6:10 pm-9:00 am

1 stop31h 50m

$614

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Tue 10/28

4:40 pm-10:20 pm

1 stop13h 40m

Osaka Kansai Intl

Fri 11/7

6:50 am-1:20 pm

1 stop23h 30m

$615

PortlandOsaka

PDX - KIX

PDXKIX

Portland

Wed 9/3

10:00 am-4:25 pm

1 stop14h 25m

Osaka Kansai Intl

Tue 9/16

6:05 pm-6:46 pm

1 stop16h 41m

$633

PortlandOsaka

PDX - KIX

PDXKIX

Portland

Sun 8/31

7:40 pm-4:25 pm

1 stop28h 45m

Osaka Kansai Intl

Sat 9/13

6:05 pm-11:01 pm

1 stop20h 56m

$635

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Tue 9/23

7:00 am-2:50 pm

1 stop15h 50m

Osaka Kansai Intl

Tue 10/7

8:30 am-2:25 pm

1 stop21h 55m

$637

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Tue 8/26

5:40 pm-9:00 pm

2 stops35h 20m

Osaka Kansai Intl

Wed 9/3

12:35 pm-4:00 pm

2 stops19h 25m

$670

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Osaka from

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 $789. 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 $793.

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 $998 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 $818 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

Best Price Found

$306

Fastest flight time

13h 20m

Direct flights

None
The best one-way flight to Osaka Kansai Intl Airport from State of Washington in the past 72 hours is $306. The best round-trip flight deal from State of Washington to Osaka Kansai Intl Airport found on momondo in the last 72 hours is $591.
The fastest flight from State of Washington to Osaka Kansai Intl Airport takes 13h 20m
There are no direct flights from State of Washington to Osaka Kansai Intl Airport. Popular non-direct routes for this connection are Portland Airport - Osaka Kansai Intl Airport and Seattle/Tacoma Intl Airport - 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 $648Free CancellationRating
8.2
473 reviews
Search Asiana Airlines flights
DeltaPriceFrom $649Free CancellationRating
8.0
7,985 reviews
Search Delta flights
Air CanadaPriceFrom $669Free CancellationRating
7.1
9,966 reviews
Search Air Canada flights
ANAPriceFrom $704Free CancellationRating
8.4
933 reviews
Search ANA flights
Korean AirPriceFrom $716Free CancellationRating
8.4
1,131 reviews
Search Korean Air flights
China EasternPriceFrom $719Free CancellationRating
7.2
160 reviews
Search China Eastern flights
United AirlinesPriceFrom $797Free CancellationRating
7.4
8,916 reviews
Search United Airlines flights
STARLUX AirlinesPriceFrom $918Free CancellationRating
9.0
206 reviews
Search STARLUX Airlines flights
EVA AirPriceFrom $963Free CancellationRating
8.4
1,233 reviews
Search EVA Air flights
China AirlinesPriceFrom $999Free CancellationRating
8.3
762 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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