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Cheap flights from Seattle to Osaka from $315

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Osaka departing on 9/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Seattle to Osaka

Cheap round-trip flights

Enter your travel dates to find the best prices.
Philippine Airlines Logo
11:10 pm - 7:35 pm
SEA
-
KIX
28h 25m
1 stop
Philippine Airlines Logo
10:25 am - 8:05 pm
KIX
-
SEA
25h 40m
1 stop
$634Philippine Airlines
Wed, Aug 26 - Wed, Sep 2
Philippine Airlines Logo
11:10 pm - 2:10 pm
SEA
-
KIX
23h 00m
1 stop
Philippine Airlines Logo
3:15 pm - 8:05 pm
KIX
-
SEA
20h 50m
1 stop
$636Philippine Airlines
Wed, Sep 2 - Wed, Sep 9
Philippine Airlines Logo
11:10 pm - 2:10 pm
SEA
-
KIX
23h 00m
1 stop
Philippine Airlines Logo
10:25 am - 8:05 pm
KIX
-
SEA
25h 40m
1 stop
$670Philippine Airlines
Sun, Aug 30 - Wed, Sep 9
Philippine Airlines Logo
11:10 pm - 2:10 pm
SEA
-
KIX
23h 00m
1 stop
Philippine Airlines Logo
3:15 pm - 8:05 pm
KIX
-
SEA
20h 50m
1 stop
$700Philippine Airlines
Fri, Sep 4 - Wed, Sep 9
Asiana Airlines Logo
12:55 am - 9:00 am
SEA
-
KIX
16h 05m
1 stop
Asiana Airlines Logo
7:45 pm - 2:55 pm
KIX
-
SEA
35h 10m
1 stop
$711Asiana Airlines
Sun, Aug 23 - Wed, Sep 9
Asiana Airlines Logo
12:55 am - 9:35 pm
SEA
-
KIX
28h 40m
1 stop
Asiana Airlines Logo
9:30 am - 2:55 pm
KIX
-
SEA
21h 25m
1 stop
$718Asiana Airlines
Mon, Apr 6 - Tue, Jun 9
Philippine Airlines Logo
11:10 pm - 2:10 pm
SEA
-
KIX
23h 00m
1 stop
Philippine Airlines Logo
10:25 am - 8:05 pm
KIX
-
SEA
25h 40m
1 stop
$720Philippine Airlines
Sun, Aug 30 - Tue, Sep 8
Asiana Airlines Logo
12:55 am - 9:00 am
SEA
-
KIX
16h 05m
1 stop
Asiana Airlines Logo
9:30 am - 2:55 pm
KIX
-
SEA
21h 25m
1 stop
$726Asiana Airlines
Tue, Sep 1 - Thu, Sep 10
Asiana Airlines Logo
12:55 am - 9:00 am
SEA
-
KIX
16h 05m
1 stop
Asiana Airlines Logo
7:45 pm - 2:55 pm
KIX
-
SEA
35h 10m
1 stop
$730Asiana Airlines
Tue, Aug 25 - Wed, Sep 2
Asiana Airlines Logo
12:55 am - 9:00 am
SEA
-
KIX
16h 05m
1 stop
Asiana Airlines Logo
7:45 pm - 2:55 pm
KIX
-
SEA
35h 10m
1 stop
$731Asiana Airlines
Tue, Apr 28 - Mon, May 11

Asiana Airlines flights from Seattle to Osaka Kansai Intl Airport

Our best Asiana Airlines deals on Seattle to Osaka Kansai Intl Airport flight tickets
Asiana Airlines
Aug 23
SEA12:55 amSeattle/Tacoma Intl
16h 05m
1 stop
KIX9:00 amOsaka Kansai Intl
Sep 9
KIX7:45 pmOsaka Kansai Intl
35h 10m
1 stop
SEA2:55 pmSeattle/Tacoma Intl
$711
Asiana Airlines
Apr 6
SEA12:55 amSeattle/Tacoma Intl
28h 40m
1 stop
KIX9:35 pmOsaka Kansai Intl
Jun 9
KIX9:30 amOsaka Kansai Intl
21h 25m
1 stop
SEA2:55 pmSeattle/Tacoma Intl
$718
Asiana Airlines
Sep 1
SEA12:55 amSeattle/Tacoma Intl
16h 05m
1 stop
KIX9:00 amOsaka Kansai Intl
Sep 10
KIX9:30 amOsaka Kansai Intl
21h 25m
1 stop
SEA2:55 pmSeattle/Tacoma Intl
$726

Delta flights from Seattle to Osaka Kansai Intl Airport

Our best Delta deals on Seattle to Osaka Kansai Intl Airport flight tickets
Delta
Apr 21
SEA12:50 pmSeattle/Tacoma Intl
17h 50m
1 stop
KIX10:40 pmOsaka Kansai Intl
May 12
KIX2:15 amOsaka Kansai Intl
24h 25m
1 stop
SEA10:40 amSeattle/Tacoma Intl
$775
Delta
Apr 21
SEA7:00 amSeattle/Tacoma Intl
23h 40m
2 stops
KIX10:40 pmOsaka Kansai Intl
May 12
KIX2:15 amOsaka Kansai Intl
24h 25m
1 stop
SEA10:40 amSeattle/Tacoma Intl
$780
Delta
Apr 14
SEA12:50 pmSeattle/Tacoma Intl
15h 55m
1 stop
KIX8:45 pmOsaka Kansai Intl
Apr 21
KIX12:35 pmOsaka Kansai Intl
20h 41m
2 stops
SEA5:16 pmSeattle/Tacoma Intl
$785

momondo Fare Finder

 
Customize your flight search to find flights from Seattle 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 March 22, 2026.
Use the filters below to find and compare flights from Seattle to Osaka Kansai Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Wed 8/26

11:10 pm-7:35 pm

1 stop28h 25m

Osaka Kansai Intl

Wed 9/2

10:25 am-8:05 pm

1 stop25h 40m

$634

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Wed 9/2

11:10 pm-2:10 pm

1 stop23h 00m

Osaka Kansai Intl

Wed 9/9

3:15 pm-8:05 pm

1 stop20h 50m

$636

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sun 8/30

11:10 pm-2:10 pm

1 stop23h 00m

Osaka Kansai Intl

Wed 9/9

10:25 am-8:05 pm

1 stop25h 40m

$670

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Fri 9/4

11:10 pm-2:10 pm

1 stop23h 00m

Osaka Kansai Intl

Wed 9/9

3:15 pm-8:05 pm

1 stop20h 50m

$700

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sun 8/23

12:55 am-9:00 am

1 stop16h 05m

Osaka Kansai Intl

Wed 9/9

7:45 pm-2:55 pm

1 stop35h 10m

$711

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Mon 4/6

12:55 am-9:35 pm

1 stop28h 40m

Osaka Kansai Intl

Tue 6/9

9:30 am-2:55 pm

1 stop21h 25m

$718

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sun 8/30

11:10 pm-2:10 pm

1 stop23h 00m

Osaka Kansai Intl

Tue 9/8

10:25 am-8:05 pm

1 stop25h 40m

$720
Quickest round-trip

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Tue 9/1

12:55 am-9:00 am

1 stop16h 05m

Osaka Kansai Intl

Thu 9/10

9:30 am-2:55 pm

1 stop21h 25m

$726

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Tue 8/25

12:55 am-9:00 am

1 stop16h 05m

Osaka Kansai Intl

Wed 9/2

7:45 pm-2:55 pm

1 stop35h 10m

$730

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Tue 4/28

12:55 am-9:00 am

1 stop16h 05m

Osaka Kansai Intl

Mon 5/11

7:45 pm-2:55 pm

1 stop35h 10m

$731

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Osaka from

How to get the cheapest flight ticket from Seattle 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, February is the cheapest month to fly from Seattle to Osaka Kansai Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $733. If you aren’t able to travel during the month of February, then book flights to Osaka Kansai Intl Airport from Seattle during November instead. Flights to Osaka Kansai Intl Airport in November, while not as cheap as those in February, still average around $745.

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 Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Osaka Kansai Intl Airport for around $842 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 Seattle for as low as $666 on momondo.

How have Seattle to Osaka Kansai Intl Airport flight prices changed over time?

As of March 2026, prices for Seattle to Osaka Kansai Intl Airport flights are approximately 33% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to Osaka Kansai Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Osaka Kansai Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Osaka Kansai Intl Airport (SEA to KIX) flight deals and tips

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

Fastest flight time

17h 50m

Direct flights

None
The fastest flight from Seattle to Osaka Kansai Intl Airport takes 17h 50m
There are no direct flights from Seattle to Osaka Kansai Intl Airport. There are no popular flight routes from Seattle to Osaka Kansai Intl Airport.
Search flight deals

  • How far is Seattle/Tacoma Intl to Osaka Kansai Intl by plane?

    The distance between Seattle/Tacoma Intl and Osaka Kansai Intl is about 5017.2 mi. By plane, this route typically takes 17h 50m.

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

    Prices for flights from Seattle/Tacoma Intl Airport to Osaka Kansai Intl Airport were last updated today.

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

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Osaka Kansai Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Osaka Kansai Intl Airport.

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

    The travel and health documents you'll need for your trip to Osaka Kansai Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Osaka Kansai Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Seattle to Osaka Kansai Intl Airport?

Best airlines flying from Seattle to Osaka Kansai Intl Airport

Compare and see reviews for airlines that fly from Seattle to Osaka Kansai Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
Alaska AirlinesPriceFrom $370Free CancellationRating
7.9
12,093 reviews
Search Alaska Airlines flights
Asiana AirlinesPriceFrom $595Free CancellationRating
8.1
505 reviews
Search Asiana Airlines flights
ANAPriceFrom $649Free CancellationRating
8.4
1,136 reviews
Search ANA flights
Korean AirPriceFrom $660Free CancellationRating
8.4
1,205 reviews
Search Korean Air flights
Air CanadaPriceFrom $669Free CancellationRating
7.1
10,830 reviews
Search Air Canada flights
STARLUX AirlinesPriceFrom $934Free CancellationRating
9.0
292 reviews
Search STARLUX Airlines flights

Traveling to a place near Osaka?

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

Why use momondo?

Why should I use momondo to find a flight deal from Seattle 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 Seattle to Osaka for you.

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

Yes. momondo allows you to filter the results for Seattle to Osaka flights to just show those with flexible booking policies.

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

momondo provides multiple filters to help you find the best flight to Osaka from Seattle. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of Seattle to Osaka flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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