The cheapest times to fly from IWK to SEA are

  • January 8th to March 11th
  • March 26th to April 22nd
  • August 20th to December 9th (except the weeks of October 8th, October 15th, and October 22nd)

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 IWK to SEA is mid to late September. Prices can be as high as $2305 for Saturday flights during early August, or as low as $776 for Tuesday flights around mid to late September.


When to Fly to Seattle

Flying from Iwakuni (IWK) to Seattle, WA (SEA) will usually cost between $1075 to $1698 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid to late September with an average ticket price of $1032. Due to high demand the most expensive time to fly is early August, with an average price of $1856. Planning your trip to low-cost times can easily save you $824 on economy flights and even more on first-class flights. Generally, any price below $1310 can be considered a good price for a round-trip IWK to SEA flight.

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

IWK to SEA Flight Prices

Compared to other flights, the IWK to SEA flight is slightly more expensive than the average and costs less than the average flight leaving from Iwakuni. The average price per mile (for a direct flight) is $0.16, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Saturdays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $305 (20%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $1178. Return trip prices are from the SEA to IWK 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 IWK to SEA can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 10 hour 16 minutes may not be realistic.


Flight Hacking IWK to SEA

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 IWK to SEA — but Champion Traveler does!

Hack #1: Okinawa (IWK > OKA > SEA)

  • Price for both tickets: $1109
  • Average savings: $202 (15.38%)

See IWK to HND flights

Hack #2: Tokyo (IWK > HND > SEA)

  • Price for both tickets: $1205
  • Average savings: $105 (8.02%)

See IWK to OKA flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 7 major airlines flying this route most often: Air Canada, Alaska, American, ANA, Delta, JAL, United, and potentially more during busy seasons.

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

The distance between the two airports is roughly 5158 miles or 8301 kilometers.

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

The real-world flight time for a nonstop IWK to SEA flight is about 10 hour 16 minutes.

How many flights go between Iwakuni and Seattle, WA?

It depends on the day of the week and the date, but a typical day might have around 13 available flights from IWK to SEA.


Airport Location Info


Departing Airport

Origination code IWK
Origination airport name Iwakuni MCAS Airport
City Iwakuni
Country Japan
Latitude 34.1
Longitude 132.2

Return Airport

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


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.