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$303+ Cheap flights from Seattle (SEA) to Osaka (OSA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — OSA
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Osaka are usually found in January or February, booked 76 days in advance, depart on a Tuesday or Saturday and return on a Wednesday

Cheap flight deals from Seattle to Osaka

Cheapest flights from Seattle to Osaka
Explore the most affordable flight options available from Seattle to Osaka. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 12/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1112:10 pmSEA - ITM
1 stop14h 45mJapan Airlines
Fri 12/192:40 pmITM - SEA
1 stop12h 10mJapan Airlines
Deal found 12/9$1,108
This Alaska Airlines deal was found by Cheapflights users on 12/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/117:00 amSEA - KIX
1 stop18h 45mMultiple Airlines
Thu 12/188:45 pmKIX - SEA
1 stop20h 07mMultiple Airlines
Deal found 12/10$1,195
This Ovago deal was found by Cheapflights users on 12/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/116:25 amSEA - ITM
2 stops20h 30mJapan Airlines
Thu 12/182:40 pmITM - SEA
1 stop12h 10mJapan Airlines
Deal found 12/10$1,234
This CheapOair deal was found by Cheapflights users on 12/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/119:30 pmSEA - KIX
1 stop29h 05mMultiple Airlines
Fri 12/192:35 pmKIX - SEA
1 stop34h 25mMultiple Airlines
Deal found 12/9$1,376
This Kiwi.com deal was found by Cheapflights users on 12/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/119:30 pmSEA - KIX
1 stop40h 55mMultiple Airlines
Wed 12/173:15 pmKIX - SEA
3 stops33h 50mMultiple Airlines
Deal found 12/11$1,434
This Expedia deal was found by Cheapflights users on 12/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/1611:24 amSEA - KIX
2 stops32h 21mMultiple Airlines
Thu 1/1512:20 pmKIX - SEA
1 stop19h 45mMultiple Airlines
Deal found 12/11$1,488
This oojo deal was found by Cheapflights users on 12/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1012:10 amSEA - UKB
1 stop16h 50mEVA Air
Fri 12/1911:00 amUKB - SEA
1 stop24h 10mEVA Air
Deal found 12/9$1,534
This oojo deal was found by Cheapflights users on 12/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/113:48 pmSEA - KIX
3 stops30h 07mCathay Pacific
Thu 12/189:25 amKIX - SEA
2 stops26h 25mCathay Pacific
Deal found 12/10$1,549
This oojo deal was found by Cheapflights users on 12/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/1512:10 amSEA - KIX
1 stop18h 25mChina Airlines
Thu 1/157:00 pmKIX - SEA
1 stop16h 10mChina Airlines
Deal found 12/11$1,583
This oojo deal was found by Cheapflights users on 12/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1111:45 pmSEA - UKB
1 stop17h 45mSTARLUX Airlines
Thu 12/1811:30 amUKB - SEA
1 stop20h 35mSTARLUX Airlines
Deal found 12/10$1,585
This oojo deal was found by Cheapflights users on 12/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/113:48 pmSEA - KIX
3 stops30h 07mCathay Pacific
Fri 12/199:25 amKIX - SEA
2 stops26h 25mCathay Pacific
Deal found 12/10$1,599
This oojo deal was found by Cheapflights users on 12/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/1611:45 pmSEA - UKB
1 stop17h 45mSTARLUX Airlines
Thu 1/1511:30 amUKB - SEA
1 stop20h 35mSTARLUX Airlines
Deal found 12/11$1,642

Find flight deals from Seattle to Osaka

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Osaka (OSA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$597
(Flightnetwork)

One-way from

$303
(SmartFares)

Popular in

December

Cheapest in

January

Average price

$1,273
Provider with most accurate pricing for Seattle/Tacoma Intl-Osaka (OSA) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Osaka (OSA) flights.
Search Deals
From Seattle/Tacoma Intl to Osaka (OSA)
Search Deals
One-way flight from Seattle/Tacoma Intl to Osaka (OSA)
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Osaka 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, Cheapflights users made 2,558,603 searches. Data last updated December 12, 2025.
Use the filters below to find and compare flights from Seattle to Osaka that are best for you.

Fly from

Seattle

Fly to

Osaka

Route

Depart

Return

Price

SeattleOsaka

SEA - ITM

SEAITM

Seattle/Tacoma Intl

Wed 1/28

12:30 pm-7:55 pm

1 stop14h 25m

Osaka Itami

Tue 2/17

2:40 pm-9:55 am

1 stop12h 15m

$625

SeattleOsaka

SEA - ITM

SEAITM

Seattle/Tacoma Intl

Tue 1/13

12:30 pm-7:55 pm

1 stop14h 25m

Osaka Itami

Tue 1/20

2:40 pm-9:55 am

1 stop12h 15m

$625

SeattleOsaka

SEA - ITM

SEAITM

Seattle/Tacoma Intl

Wed 3/4

12:30 pm-10:00 am

2 stops28h 30m

Osaka Itami

Tue 3/24

7:10 am-10:55 am

2 stops19h 45m

$629

SeattleOsaka

SEA - ITM

SEAITM

Seattle/Tacoma Intl

Wed 3/4

12:30 pm-10:00 am

2 stops28h 30m

Osaka Itami

Mon 3/23

3:30 pm-10:55 am

2 stops35h 25m

$629

SeattleOsaka

SEA - ITM

SEAITM

Seattle/Tacoma Intl

Sun 3/1

12:30 pm-8:00 pm

1 stop14h 30m

Osaka Itami

Wed 3/18

10:35 am-10:55 am

1 stop16h 20m

$630

SeattleOsaka

SEA - ITM

SEAITM

Seattle/Tacoma Intl

Tue 3/3

12:30 pm-8:00 pm

1 stop14h 30m

Osaka Itami

Wed 3/18

10:35 am-10:55 am

1 stop16h 20m

$630

SeattleOsaka

SEA - ITM

SEAITM

Seattle/Tacoma Intl

Sat 1/24

3:45 pm-8:10 am

1 stop23h 25m

Osaka Itami

Sat 1/31

2:00 pm-1:20 pm

1 stop16h 20m

$633

SeattleOsaka

SEA - ITM

SEAITM

Seattle/Tacoma Intl

Tue 3/3

12:30 pm-8:00 pm

1 stop14h 30m

Osaka Itami

Wed 3/25

3:30 pm-4:54 pm

2 stops17h 24m

$636

SeattleKobe

SEA - UKB

SEAUKB

Seattle/Tacoma Intl

Sat 1/10

3:45 pm-8:00 am

1 stop23h 15m

Kobe

Sat 1/17

9:15 pm-1:20 pm

1 stop33h 05m

$638

SeattleOsaka

SEA - KIX

SEAKIX

Seattle/Tacoma Intl

Sat 1/10

6:03 am-4:40 pm

1 stop17h 37m

Osaka Kansai Intl

Sat 1/17

5:35 pm-1:20 pm

1 stop12h 45m

$639

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 58 results
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Compare providers for flights from Seattle to Osaka

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Osaka in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Osaka flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Seattle-Osaka flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Seattle-Osaka flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Osaka flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Osaka flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Osaka

Have a flexible travel schedule? Discover the best time to fly to Osaka from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Osaka

How far ahead should I book a flight from Seattle to Osaka?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Osaka. Price data was last updated on December 5, 2025.

The price you pay for your flight from Seattle to Osaka may vary depending on when you book. For the best chance of a lower fare, look to book 76 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Seattle to Osaka?

Currently, January is the cheapest month in which you can book a flight from Seattle to Osaka (average of $370). Flying from Seattle to Osaka in June is currently the most expensive (average of $816). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to OSA?

Find hourly flight availability from Seattle to Osaka. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 12, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 35% on flights from Seattle to Osaka by exploring options for tickets in the evening.

What is the cheapest day to fly from Seattle to Osaka?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Osaka. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Seattle to Osaka flight should consider departing on Thursday at noon when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

What’s the top layover airport for flights from Seattle to Osaka?

Share of 1-stop round-trip flights from Seattle to Osaka chosen by Cheapflights users in the past 12 months, using the same layover each way.

Honolulu (HNL) – chosen by Cheapflights users on 50% of 1-stop itineraries from Seattle to Osaka on Cheapflights.

What’s the cheapest layover airport for flights from Seattle to Osaka?

Average round-trip fare for 1-stop flights from Seattle to Osaka, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Honolulu (HNL) is the most affordable 1-stop option, with an average round-trip price of $548.

What’s the fastest layover option from Seattle to Osaka?

Shortest average travel time for 1-stop one-way flights from Seattle to Osaka, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Tokyo (HND) have the shortest average one-way travel time for 1-stop routes: 13h 35m.

Which airport typically offers the quickest layover for flights from Seattle to Osaka?

Average layover duration for 1-stop one-way flights from Seattle to Osaka, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Tokyo (HND) offer the fastest connection on this route, with an average layover time of 2h 19m.

Reviews of airlines servicing Osaka

Get insights into the airlines that provide service to Osaka. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Osaka. Reviews last updated December 12, 2025.
Get a feel of what it's like to fly with ANA, Korean Air, and Japan Airlines from Seattle to Osaka by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
ANA
8.4
Very good
1,021 reviews

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Julie,Sep 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.
ANA
8.4
Very good
1,021 reviews
ANA
8.4
Very good
1,021 reviews

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Julie,Sep 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.
Korean Air
8.4
Very good
1,184 reviews
ANA
8.4
Very good
1,021 reviews

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Julie,Sep 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.
Japan Airlines
8.3
Very good
1,653 reviews
ANA
8.4
Very good
1,021 reviews

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Julie,Sep 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.
Asiana Airlines
8.2
Very good
492 reviews
ANA
8.4
Very good
1,021 reviews

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Julie,Sep 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.
Air Canada
7.1
Good
10,517 reviews
ANA
8.4
Very good
1,021 reviews

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Julie,Sep 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Osaka. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Osaka?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Osaka. On average, Seattle/Tacoma Intl has 0 outbound flights to Osaka per day from 9 airlines. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

  • How long is the flight from Seattle to Osaka?

    A quick flight from Seattle to Osaka can take about 14h 25m. Japan Airlines provides one of the quickest options available for as low as $625. Airlines will cover a distance of 4999 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Seattle to Osaka round-trip?

    Alaska Airlines, at $370, was found to be the cheapest airline from Seattle to Osaka.Alternate airlines to your destination round-trip include Asiana Airlines and United Airlines. These flights start at 58% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Seattle to Osaka one-way?

    The cheapest airlines for a one-way flight from Seattle to Osaka are Asiana Airlines ($304), Korean Air ($355), and Air Canada ($360).

  • What are the most popular routes from Seattle to Osaka?

    While some choose either Seattle/Tacoma Intl - Osaka Itami or Seattle/Tacoma Intl - Kobe, Seattle/Tacoma Intl - Osaka Kansai Intl is the most popular route from Seattle to Osaka.

  • Where are the most common layover locations when flying from Seattle to Osaka?

    Seattle to Osaka flights have a layover in Tokyo most of the time.

  • What are some popular things to do or see while on a layover in Tokyo?

    Akihabara Electric Town, Tsukiji Outer Market, and Tokyo Tower are the most popular attractions in Tokyo if you're in need of something to do during your layover. Akihabara Electric Town, Tsukiji Outer Market, and Tokyo Tower can be visited by traveling about 10.3 mi, 7.9 mi, and 7.9 mi respectively from Tokyo Haneda. Travelers can book a car rental at Tokyo Haneda for about $64 per day to make their sightseeing more efficient.

  • Where are the least popular layover locations for Seattle to Osaka flights?

    The least popular layover on flights from Seattle to Osaka is Vancouver.

  • Can I find deals for flights from Seattle to Osaka that include hotel bookings?

    Yes. In addition to deals on Seattle to Osaka flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Osaka?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Osaka.

  • Can I find deals for business class flights from Seattle to Osaka?

    Yes. Cheapflights offers flight deals from Seattle to Osaka by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Osaka?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Osaka (average of $370). Flying from Seattle to Osaka in June is currently the most expensive (average of $816). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Osaka?

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

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Alternative routes for Seattle to Osaka

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Kansai Intl flights
Seattle to Osaka Itami flights
Portland to Kansai Intl flights
Portland to Osaka Itami flights
Pasco to Kansai Intl flights

Top 9 airlines flying from Seattle to Osaka

Discover the top 9 airlines that operate flights from Seattle to Osaka. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$370Average$438FlexibilityNo cancel feeOn-time75%
Asiana AirlinesCheapest$595Average$772FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$647Average$837FlexibilityNo cancel feeOn-time69%
ANACheapest$657Average$813FlexibilityNo cancel feeOn-time80%
Air CanadaCheapest$669Average$802FlexibilityNo cancel feeOn-time67%
Japan AirlinesCheapest$697Average$1,128FlexibilityNo cancel feeOn-time79%
Korean AirCheapest$716Average$976FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$1,056Average$1,167FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$1,095Average$1,294FlexibilityNo cancel feeOn-timeN/A

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