Cheap Flights from Seattle to Sydney from $386

Frequently Asked Questions

• What are the cheapest flights from Seattle to Sydney (SEA-SYD)?

  Based on Trip.com data, Philippine Airlines offers one-way fares as low as $386 on Cheapest nonstop routes (e.g. SEA to SYD on Sun, Mar 22), while Philippine Airlines offers Cheapest nonstop round-trips from $925 departing on Thu, May 7 and returning on Tue, May 12.

• Which airlines offer flights from Seattle to Sydney?

  At the moment, several airlines serve connecting flights from Seattle to Sydney, including: Alaska Airlines Air Canada Selected airlines are based on historical data collected from flight bookings made by users on Trip.com within the last 90 days.

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

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seattle to Sydney 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 Seattle to Sydney?

  To find best deals on flights from Seattle to Sydney, 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 Sun, Mar 22, with one-way flights priced at just $386.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Philippine 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 Sydney travel is around January.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from Seattle (SEA) to Sydney (SYD) the cheapest?

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

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

  After crunching the numbers on our March flight calendar, it's currently cheapest to fly from Seattle to Sydney on March 16, 2026 with Frontier Airlines, with prices starting at $1,002.

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

  You can land at any one of the following hubs in Sydney, with Seattle-Tacoma International Airport to Sydney Airport (SEA-SYD) is by far the most common option on this route: Sydney Airport (SYD).

• Is there any time difference between Seattle and Sydney?

  The time difference between Sydney and Seattle is 18h.

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

  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.