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Cheap flights from Seattle to Osaka from $323

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 1/19. 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
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.
Multiple Airlines Logo
5:50 am - 8:35 pm
SEA
-
KIX
21h 45m2 stops
Multiple Airlines Logo
10:50 am - 7:16 pm
KIX
-
SEA
25h 26m2 stops
$608Multiple Airlines
Wed, Jan 21 - Wed, Jan 28
Multiple Airlines Logo
10:05 am - 8:45 am
SEA
-
KIX
29h 40m2 stops
Multiple Airlines Logo
8:00 am - 10:51 pm
KIX
-
SEA
31h 51m2 stops
$623Multiple Airlines
Sun, Feb 1 - Sun, Feb 8
Asiana Airlines Logo
12:10 am - 9:40 am
SEA
-
KIX
17h 30m1 stop
Asiana Airlines Logo
9:10 am - 2:55 pm
KIX
-
SEA
21h 45m1 stop
$626Asiana Airlines
Sun, Apr 12 - Mon, Apr 27
Korean Air Logo
11:00 am - 12:50 pm
SEA
-
KIX
32h 50m1 stop
Korean Air Logo
9:00 am - 9:00 am
KIX
-
SEA
17h 00m1 stop
$628Korean Air
Sun, Feb 1 - Sun, Feb 8
Japan Airlines Logo
6:00 am - 6:50 pm
SEA
-
KIX
19h 50m1 stop
Japan Airlines Logo
8:00 am - 9:55 am
KIX
-
SEA
18h 55m1 stop
$629Japan Airlines
Tue, Jan 20 - Tue, Jan 27
Multiple Airlines Logo
8:06 am - 6:50 pm
SEA
-
KIX
17h 44m1 stop
Multiple Airlines Logo
7:00 am - 9:55 am
KIX
-
SEA
19h 55m1 stop
$630Multiple Airlines
Wed, Jan 21 - Tue, Feb 3
Japan Airlines Logo
6:00 am - 6:50 pm
SEA
-
KIX
19h 50m1 stop
Japan Airlines Logo
3:00 pm - 4:04 pm
KIX
-
SEA
18h 04m2 stops
$634Japan Airlines
Sun, Feb 1 - Wed, Feb 18
ANA Logo
6:03 am - 4:40 pm
SEA
-
KIX
17h 37m1 stop
ANA Logo
5:35 pm - 1:20 pm
KIX
-
SEA
12h 45m1 stop
$636ANA
Thu, Jan 15 - Thu, Jan 22
Japan Airlines Logo
6:00 am - 6:50 pm
SEA
-
KIX
19h 50m1 stop
Japan Airlines Logo
3:00 pm - 4:04 pm
KIX
-
SEA
18h 04m2 stops
$638Japan Airlines
Mon, Feb 2 - Wed, Mar 4
ANA Logo
6:03 am - 4:40 pm
SEA
-
KIX
17h 37m1 stop
ANA Logo
5:35 pm - 1:20 pm
KIX
-
SEA
12h 45m1 stop
$639ANA
Sat, Jan 10 - Sat, Jan 24

Japan Airlines flights from Seattle to Osaka Kansai Intl Airport

Our best Japan Airlines deals on Seattle to Osaka Kansai Intl Airport flight tickets
Japan Airlines
Jan 20
SEA6:00 amSeattle/Tacoma Intl
19h 50m
1 stop
KIX6:50 pmOsaka Kansai Intl
Jan 27
KIX8:00 amOsaka Kansai Intl
18h 55m
1 stop
SEA9:55 amSeattle/Tacoma Intl
$629
Find similar
Japan Airlines
Feb 1
SEA6:00 amSeattle/Tacoma Intl
19h 50m
1 stop
KIX6:50 pmOsaka Kansai Intl
Feb 18
KIX3:00 pmOsaka Kansai Intl
18h 04m
2 stops
SEA4:04 pmSeattle/Tacoma Intl
$634
Find similar
Japan Airlines
Feb 2
SEA6:00 amSeattle/Tacoma Intl
19h 50m
1 stop
KIX6:50 pmOsaka Kansai Intl
Mar 4
KIX3:00 pmOsaka Kansai Intl
18h 04m
2 stops
SEA4:04 pmSeattle/Tacoma Intl
$638
Find similar

Korean Air flights from Seattle to Osaka Kansai Intl Airport

Our best Korean Air deals on Seattle to Osaka Kansai Intl Airport flight tickets
Korean Air
Feb 1
SEA11:00 amSeattle/Tacoma Intl
32h 50m
1 stop
KIX12:50 pmOsaka Kansai Intl
Feb 8
KIX9:00 amOsaka Kansai Intl
17h 00m
1 stop
SEA9:00 amSeattle/Tacoma Intl
$628
Find similar
Korean Air
Jan 29
SEA11:00 amSeattle/Tacoma Intl
16h 45m
1 stop
KIX8:45 pmOsaka Kansai Intl
Feb 15
KIX6:10 pmOsaka Kansai Intl
31h 50m
1 stop
SEA9:00 amSeattle/Tacoma Intl
$657
Find similar
Korean Air
Apr 15
SEA12:50 pmSeattle/Tacoma Intl
16h 10m
1 stop
KIX9:00 pmOsaka Kansai Intl
Apr 24
KIX12:35 pmOsaka Kansai Intl
14h 05m
1 stop
SEA10:40 amSeattle/Tacoma Intl
$666
Find similar

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 December 23, 2025.
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

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Wed 1/21

5:50 am-8:35 pm

2 stops21h 45m

Osaka Kansai Intl

Wed 1/28

10:50 am-7:16 pm

2 stops25h 26m

$608

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sun 2/1

10:05 am-8:45 am

2 stops29h 40m

Osaka Kansai Intl

Sun 2/8

8:00 am-10:51 pm

2 stops31h 51m

$623

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sun 4/12

12:10 am-9:40 am

1 stop17h 30m

Osaka Kansai Intl

Mon 4/27

9:10 am-2:55 pm

1 stop21h 45m

$626

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sun 2/1

11:00 am-12:50 pm

1 stop32h 50m

Osaka Kansai Intl

Sun 2/8

9:00 am-9:00 am

1 stop17h 00m

$628

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Tue 1/20

6:00 am-6:50 pm

1 stop19h 50m

Osaka Kansai Intl

Tue 1/27

8:00 am-9:55 am

1 stop18h 55m

$629

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Wed 1/21

8:06 am-6:50 pm

1 stop17h 44m

Osaka Kansai Intl

Tue 2/3

7:00 am-9:55 am

1 stop19h 55m

$630

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sun 2/1

6:00 am-6:50 pm

1 stop19h 50m

Osaka Kansai Intl

Wed 2/18

3:00 pm-4:04 pm

2 stops18h 04m

$634

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Thu 1/15

6:03 am-4:40 pm

1 stop17h 37m

Osaka Kansai Intl

Thu 1/22

5:35 pm-1:20 pm

1 stop12h 45m

$636

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Mon 2/2

6:00 am-6:50 pm

1 stop19h 50m

Osaka Kansai Intl

Wed 3/4

3:00 pm-4:04 pm

2 stops18h 04m

$638

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sat 1/10

6:03 am-4:40 pm

1 stop17h 37m

Osaka Kansai Intl

Sat 1/24

5:35 pm-1:20 pm

1 stop12h 45m

$639

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 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, November 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 $757. If you aren’t able to travel during the month of November, then book flights to Osaka Kansai Intl Airport from Seattle during September instead. Flights to Osaka Kansai Intl Airport in September, while not as cheap as those in November, still average around $783.

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

The cheapest day to depart from Seattle 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 Seattle 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 Seattle 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 Seattle 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 Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Osaka Kansai Intl Airport for around $910 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 $762 on momondo.

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

As of December 2025, prices for Seattle to Osaka Kansai Intl Airport flights are approximately 45% 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

15h 38m

Direct flights

None
The fastest flight from Seattle to Osaka Kansai Intl Airport takes 15h 38m
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 15h 38m.

  • 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
8.0
11,508 reviews
Search Alaska Airlines flights
Asiana AirlinesPriceFrom $595Free CancellationRating
8.2
496 reviews
Search Asiana Airlines flights
United AirlinesPriceFrom $647Free CancellationRating
7.4
9,105 reviews
Search United Airlines flights
ANAPriceFrom $650Free CancellationRating
8.4
1,034 reviews
Search ANA flights
Korean AirPriceFrom $660Free CancellationRating
8.4
1,185 reviews
Search Korean Air flights
Air CanadaPriceFrom $669Free CancellationRating
7.1
10,551 reviews
Search Air Canada flights
STARLUX AirlinesPriceFrom $934Free CancellationRating
8.9
248 reviews
Search STARLUX Airlines flights
China AirlinesPriceFrom $1,056Free CancellationRating
8.3
792 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
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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