There are most likely no direct flights on the Seattle — Sydney route
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A non-stop flight is the most convenient and comfortable way to fly from Seattle to Sydney, despite the fact that sometimes flights with transfers can cost significantly less.
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Answers to questions about the route that travelers are most interested in.
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There are most likely no direct flights on the Seattle — Sydney route
There appear to be no non-stop flights from Seattle to Sydney at this time.... Well, or something went wrong on our side and we couldn't find anything
starting at $715
The route Seattle — Sydney is served by a single airline — Alaska Airlines. This means that when planning your trip, you won’t need to spend time choosing between dozens of carriers: all flights are operated by one provider, which simplifies the booking process. Despite the limited choice, passengers can still plan ahead, select optimal departure dates, and buy tickets at the lowest price — from $715. Using our service, you can quickly compare available Alaska Airlines flights and book a seat in advance at a favorable rate.
The cheapest one-way flight from Seattle to Sydney departs on 07/08/2026, is operated by Alaska Airlines and costs $715
There is no information about the cheapest roundtrip flight from Seattle to Sydney
Fastest flight from Seattle to Sydney takes 1d 12h 20m
There are no direct flights on this route.
The distance between Seattle and Sydney is 12469km (7731 miles). The time difference between Seattle and Sydney is 18h
The cheapest flight ticket from Seattle to Sydney according to data for the last 48 hours costs $715
Often the best time to buy tickets from Seattle to Sydney is 2 months before departure.
Based on statistics over the past years, the lowest prices for flights from Seattle to Sydney can be found flying in these months: August, June, September.
The fastest flights from Seattle to Sydney start from 12 hours 20 minutes in the air.
The following airlines operate direct flights on the route Seattle — Sydney:
The minimum one-way ticket price from Seattle to Sydney is $535 (August 2026), while the maximum is $655 (September 2026). On average, a ticket costs $606–$1,283.
Tickets from Seattle to Sydney cost roughly the same any month. This is convenient: you can plan your trip based on your schedule rather than prices.
There is a slight difference: it's a bit cheaper in June 2026–August 2026 (averaging $581) and slightly more in August 2026–September 2026 ($595). But overall, the difference is small.
On this route, you don't need to target specific months — prices are stable. The difference between the cheapest and most expensive period is only 2%. Book whenever it's convenient.
Monthly price variation is just 8.5%. Ticket costs on this route are among the most predictable.
We couldn't find any special offers for flights from Seattle to Sydney