Cheap Flights from Osaka to Seattle from $397

Frequently Asked Questions

• What are the cheapest flights from Osaka to Seattle (OSA-SEA)?

  Based on Trip.com data, Hainan Airlines offers one-way fares as low as $397 on Cheapest nonstop routes (e.g. KIX to SEA on Mon, Mar 9), while Air Canada offers Cheapest nonstop round-trips from $636 departing on Fri, Apr 3 and returning on Mon, Apr 6.

• Which airlines offer direct flights from Osaka to Seattle?

  At the moment, you can catch a nonstop flight from Osaka to Seattle with the following airlines, including: Korean Air Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• When is the best time to book flights from Osaka to Seattle?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Osaka to Seattle is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How can I find the best deals on flights from Osaka to Seattle?

  To find best deals on flights from Osaka to Seattle, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Mon, Mar 9, with one-way flights priced at just $397.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Hainan Airlines.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for Seattle travel is around January.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from Osaka (OSA) to Seattle (SEA) the cheapest?

  The cheapest months to fly from Osaka to Seattle is December, when demand for travel is lower.

• Which upcoming date is cheapest to fly from Osaka to Seattle on?

  After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Osaka to Seattle on February 16, 2026 with Hainan Airlines, with prices starting at $410.

• Which airports can I fly to for Seattle from Osaka?

  You can land at any one of the following hubs in Seattle, with Kansai International Airport to Seattle–Tacoma International Airport (KIX-SEA) is by far the most common option on this route: Seattle–Tacoma International Airport (SEA) King County (Boeing Field) International Airport (BFI) Kenmore Air - Lake Union (LKE).

• Is there any time difference between Osaka and Seattle?

  The time difference between Seattle and Osaka is 17h.

• How do I change or cancel my ticket from Osaka to Seattle?

  Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.