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Cheap flights from Seattle 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 Seattle 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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Find the cheapest flights from Seattle to Osaka

Cheap round-trip flights

Asiana Airlines Logo
2:15 pm - 3:50 pmSEA-KIX
33h 35m1 stop
Asiana Airlines Logo
9:10 am - 12:30 pmKIX-SEA
19h 20m1 stop
$591Asiana Airlines
Find Deal
seg, set 15 - seg, set 29
Asiana Airlines Logo
2:15 pm - 5:50 pmSEA-KIX
35h 35m1 stop
Asiana Airlines Logo
10:50 am - 12:30 pmKIX-SEA
17h 40m1 stop
$592Asiana Airlines
Find Deal
seg, set 1 - dom, set 14
Korean Air Logo
1:32 pm - 10:45 amSEA-KIX
52h 13m2 stops
Korean Air Logo
6:10 pm - 8:35 pmKIX-SEA
43h 25m2 stops
$614Korean Air
Find Deal
sáb, dez 6 - seg, dez 15
ANA Logo
4:30 pm - 9:50 pmSEA-KIX
13h 20m1 stop
ANA Logo
5:30 pm - 2:25 pmKIX-SEA
12h 55m1 stop
$615ANA
Find Deal
dom, set 21 - ter, set 23
Korean Air Logo
12:50 pm - 9:00 pmSEA-KIX
16h 10m1 stop
Korean Air Logo
6:20 pm - 10:40 amKIX-SEA
32h 20m1 stop
$616Korean Air
Find Deal
dom, set 7 - sáb, set 20
ANA Logo
4:30 pm - 9:50 pmSEA-KIX
13h 20m1 stop
ANA Logo
11:00 am - 3:14 pmKIX-SEA
20h 14m2 stops
$619ANA
Find Deal
dom, set 21 - ter, set 23
United Airlines Logo
7:00 am - 2:50 pmSEA-KIX
15h 50m1 stop
United Airlines Logo
4:50 pm - 3:14 pmKIX-SEA
14h 24m1 stop
$645United Airlines
Find Deal
qua, set 10 - qua, set 24
United Airlines Logo
5:14 pm - 2:50 pmSEA-KIX
29h 36m2 stops
United Airlines Logo
4:50 pm - 10:15 pmKIX-SEA
21h 25m2 stops
$650United Airlines
Find Deal
sáb, set 6 - ter, set 23
Delta Logo
7:20 am - 9:00 pmSEA-KIX
20h 40m2 stops
Delta Logo
9:15 am - 9:00 amKIX-SEA
16h 45m1 stop
$655Delta
Find Deal
dom, nov 9 - ter, nov 18
Delta Logo
7:20 am - 9:00 pmSEA-KIX
20h 40m2 stops
Delta Logo
11:55 am - 4:20 pmKIX-SEA
21h 25m2 stops
$665Delta
Find Deal
ter, nov 11 - qui, nov 20

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
Dec 6
SEA1:32 pmSeattle/Tacoma Intl
52h 13m
2 stops
KIX10:45 amOsaka Kansai Intl
Dec 15
KIX6:10 pmOsaka Kansai Intl
43h 25m
2 stops
SEA8:35 pmSeattle/Tacoma Intl
$614
Find similar
Korean Air
Sep 7
SEA12:50 pmSeattle/Tacoma Intl
16h 10m
1 stop
KIX9:00 pmOsaka Kansai Intl
Sep 20
KIX6:20 pmOsaka Kansai Intl
32h 20m
1 stop
SEA10:40 amSeattle/Tacoma Intl
$616
Find similar
Korean Air
Sep 7
SEA12:50 pmSeattle/Tacoma Intl
16h 10m
1 stop
KIX9:00 pmOsaka Kansai Intl
Sep 20
KIX12:35 pmOsaka Kansai Intl
25h 01m
2 stops
SEA9:36 pmSeattle/Tacoma Intl
$630
Find similar

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
Sep 15
SEA2:15 pmSeattle/Tacoma Intl
33h 35m
1 stop
KIX3:50 pmOsaka Kansai Intl
Sep 29
KIX9:10 amOsaka Kansai Intl
19h 20m
1 stop
SEA12:30 pmSeattle/Tacoma Intl
$591
Find similar
Asiana Airlines
Sep 1
SEA2:15 pmSeattle/Tacoma Intl
35h 35m
1 stop
KIX5:50 pmOsaka Kansai Intl
Sep 14
KIX10:50 amOsaka Kansai Intl
17h 40m
1 stop
SEA12:30 pmSeattle/Tacoma Intl
$592
Find similar
Asiana Airlines
Aug 31
SEA2:30 pmSeattle/Tacoma Intl
33h 20m
1 stop
KIX3:50 pmOsaka Kansai Intl
Sep 14
KIX10:50 amOsaka Kansai Intl
17h 40m
1 stop
SEA12:30 pmSeattle/Tacoma Intl
$599
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 agosto 18, 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

seg 9/15

2:15 pm-3:50 pm

1 stop33h 35m

Osaka Kansai Intl

seg 9/29

9:10 am-12:30 pm

1 stop19h 20m

$591

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

seg 9/1

2:15 pm-5:50 pm

1 stop35h 35m

Osaka Kansai Intl

dom 9/14

10:50 am-12:30 pm

1 stop17h 40m

$592

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

sáb 12/6

1:32 pm-10:45 am

2 stops52h 13m

Osaka Kansai Intl

seg 12/15

6:10 pm-8:35 pm

2 stops43h 25m

$614

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

dom 9/21

4:30 pm-9:50 pm

1 stop13h 20m

Osaka Kansai Intl

ter 9/23

5:30 pm-2:25 pm

1 stop12h 55m

$615

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

dom 9/7

12:50 pm-9:00 pm

1 stop16h 10m

Osaka Kansai Intl

sáb 9/20

6:20 pm-10:40 am

1 stop32h 20m

$616

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

dom 9/21

4:30 pm-9:50 pm

1 stop13h 20m

Osaka Kansai Intl

ter 9/23

11:00 am-3:14 pm

2 stops20h 14m

$619

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

qua 9/10

7:00 am-2:50 pm

1 stop15h 50m

Osaka Kansai Intl

qua 9/24

4:50 pm-3:14 pm

1 stop14h 24m

$645

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

sáb 9/6

5:14 pm-2:50 pm

2 stops29h 36m

Osaka Kansai Intl

ter 9/23

4:50 pm-10:15 pm

2 stops21h 25m

$650

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

dom 11/9

7:20 am-9:00 pm

2 stops20h 40m

Osaka Kansai Intl

ter 11/18

9:15 am-9:00 am

1 stop16h 45m

$655

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

ter 11/11

7:20 am-9:00 pm

2 stops20h 40m

Osaka Kansai Intl

qui 11/20

11:55 am-4:20 pm

2 stops21h 25m

$665

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, September 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 $789. If you aren’t able to travel during the month of September, then book flights to Osaka Kansai Intl Airport from Seattle 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 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 $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 Seattle for as low as $818 on momondo.

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

As of August 2025, prices for Seattle to Osaka Kansai Intl Airport flights are approximately 43% 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

Best Price Found

$306

Fastest flight time

13h 10m

Direct flights

None
The best one-way flight to Osaka Kansai Intl Airport from Seattle in the past 72 hours is $306. The best round-trip flight deal from Seattle to Osaka Kansai Intl Airport found on momondo in the last 72 hours is $591.
The fastest flight from Seattle to Osaka Kansai Intl Airport takes 13h 10m
There are no direct flights from Seattle to Osaka Kansai Intl Airport. Popular non-direct route for this connection is Seattle/Tacoma Intl Airport - 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 13h 20m.

  • 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
Asiana AirlinesPriceFrom $648Free CancellationRating
8.2
476 reviews
Search Asiana Airlines flights
DeltaPriceFrom $649Free CancellationRating
8.0
7,981 reviews
Search Delta flights
Air CanadaPriceFrom $669Free CancellationRating
7.1
9,992 reviews
Search Air Canada flights
ANAPriceFrom $681Free CancellationRating
8.4
934 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
8,925 reviews
Search United Airlines flights
STARLUX AirlinesPriceFrom $918Free CancellationRating
9.0
206 reviews
Search STARLUX Airlines flights
EVA AirPriceFrom $963Free CancellationRating
8.4
1,232 reviews
Search EVA Air flights
China AirlinesPriceFrom $999Free CancellationRating
8.3
764 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

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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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