The cheapest times to fly from SEA to KIX are

  • January 8th to May 13th (except the week of January 22nd)
  • September 17th to November 25th (except the week of October 8th)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from SEA to KIX is early to mid March. Prices can be as high as $1503 for Saturday flights during late December, or as low as $742 for Wednesday flights around early to mid March.


When to Fly to Osaka

Flying from Seattle, WA (SEA) to Osaka (KIX) will usually cost between $743 to $1174 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early to mid March with an average ticket price of $770. Due to high demand the most expensive time to fly is late December, with an average price of $1226. Planning your trip to low-cost times can easily save you $456 on economy flights and even more on first-class flights. Generally, any price below $885 can be considered a good price for a round-trip SEA to KIX flight.

See below for a graph of average weekly prices for the SEA to KIX route. All prices are for round-trip tickets in USD.

SEA to KIX Flight Prices

Compared to other flights, the SEA to KIX flight is cheaper than the average and costs less than the average flight leaving from Seattle. The average price per mile (for a direct flight) is $0.11, which is far below average.


Flight Prices by Day of the Week

Wednesday is usually the cheapest day to fly to KIX, and Tuesday the cheapest day to fly back into SEA. Saturdays are the most expensive days to fly to Osaka, and Sundays are the most expensive days to return to Seattle. Selecting flights on the least expensive days could save you up to $89 (9%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Wednesday and returning a week later will cost an average of $869. Return trip prices are from the KIX to SEA flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from SEA to KIX can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 10 hour 2 minutes may be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is a nonstop flight from SEA to KIX while comparing.

Destination alternative #1: Chubu Centrair International Airport (NGO) in Nagoya

  • 94 miles (151 km) away from KIX
  • Usually 1.02% less expensive than KIX
  • 1-layover flights available

See SEA to NGO flights


Flight Hacking SEA to KIX

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from SEA to KIX — but Champion Traveler does!

Hack #1: Las Vegas, NV (SEA > LAS > KIX)

  • Price for both tickets: $845
  • Average savings: $41 (4.58%)

See SEA to LAS flights

Hack #2: Hong Kong (SEA > HKG > KIX)

  • Price for both tickets: $882
  • Average savings: $4 (0.4%)

See SEA to HKG flights


Flight Questions Answered

Still have questions about flying from SEA to KIX? We’ve got answers.

Which airlines fly this route?

You can find 23 major airlines flying this route most often: Air Busan, Air Canada, Air China, Alaska, American, ANA, Asiana, Cathay Pacific, China Airlines, China Eastern, China Southern, Delta, EVA Air, Hainan, Hawaiian, Hong Kong Airlines, JAL, Korean Air, Lufthansa, Peach Aviation, THAI, United, Xiamen, and potentially more during busy seasons.

How far away is it from Kansai International Airport to Seattle/Tacoma International Airport?

The distance between the two airports is roughly 5027 miles or 8090 kilometers.

How long does it take to fly from SEA to KIX?

The real-world flight time for a nonstop SEA to KIX flight is about 10 hour 2 minutes.

How many flights go between Seattle, WA and Osaka?

It depends on the day of the week and the date, but a typical day might have around 101 available flights from SEA to KIX.


Airport Location Info


Departing Airport

Origination code SEA
Origination airport name Seattle/Tacoma International Airport
City Seattle, WA
Country the United States
Latitude 47.5
Longitude -122.3

Return Airport

Destination code KIX
Destination airport name Kansai International Airport
City Osaka
Country Japan
Latitude 34.4
Longitude 135.2


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.