The Seattle–Sydney route
SEA–SYD is a long-haul pairing from the United States to Sydney: roughly 7,750 miles. This city pair is usually a connecting trip: about 7,750 miles of flying, with the shortest timed itineraries near 15.5 hours plus a layover. Overnight westbound is common; compare arrival local time, not only the duration field.
For SEA–SYD we show about $509 on the low end and around $905 as a more typical one-way economy total, USD, last reviewed August 2026. Long-haul sale banners expire; a $509 one-way is a planning floor, not a coupon. Taxes, bags, and seats change what you pay on the seller site.
Search SEA to SYD on Azurovia, compare airline-direct and travel-site totals on the same flights, then finish with the seller. We do not ticket. Keep their confirmation for changes.
Distance and time SEA–SYD
Seattle and Sydney sit about 7,750 miles apart. If a nonstop is missing from SEA, timed itineraries near 15.5 hours of flying usually mean one long-haul plus a shorter feeder — not two equal hops.
Sydney is about 18 hours ahead of Seattle on standard time (America/Los_Angeles vs Australia/Sydney). Arrival clocks on SYD are local. That matters more on this pair than on a same-zone hop.
Most Seattle–Sydney journeys connect rather than fly nonstop from SEA. Timed one-stop itineraries often bank at Los Angeles International (LAX), San Francisco International (SFO), O'Hare International (ORD). That is a pattern, not a promise for your dates. On results, sort by fastest if you care about layover pain, or cheapest if you do not.
Airports for Seattle to Sydney
You depart Seattle-Tacoma International in Seattle, United States, and arrive at Sydney Kingsford Smith in Sydney, Australia. SEA is the origin code we use on this guide; SYD is the arrival code. If you need a visa or an ESTA, that is between you and the destination government — Azurovia does not ticket and does not process immigration.
SEA is the only origin code we list in this metro. SYD is the arrival code we treat as primary for Sydney. A cheaper nearby airport only wins if the transfer still fits your plan. Search with “include nearby airports” when you want those codes in one results list.
Airport pages: SEA Seattle-Tacoma International · SYD Sydney Kingsford Smith
City hubs: Flights from Seattle · Flights to Sydney
Bags on SEA–SYD
Long-haul SEA–SYD fares sometimes include a checked bag on the airline site and unbundle it on a travel site, or the reverse. Rank the USD total you will actually pay, including bags, before you click out. Azurovia does not ticket.
Airlines often shown
Qantas is among the names that commonly appear on SEA–SYD, alongside American Airlines, United, Delta. That is who often operates or sells this city pair in our catalog, not a daily guarantee. Live search is the inventory that exists for your dates.
When people fly
On Seattle–Sydney, demand is often softer in Mar and Apr, with Oct and Nov also worth checking. US holidays still reprice this pair. Move a day on the results strip before you assume the first date you typed is the cheapest.
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Questions about this city pair
How long is the flight from Seattle to Sydney?
There is usually no nonstop. Plan on about 15.5 hours of flying (7,750 miles) plus layover time.
When are Seattle to Sydney fares often lower?
Demand is usually softer in Mar and Apr on this route, but live prices move daily. Search a few nearby dates rather than assuming a season is always cheapest.
Which airlines fly Seattle to Sydney?
Sellers commonly show Qantas, American Airlines, United, Delta on this city pair. The set on any given day depends on schedule and which travel sites return a fare.
What do Seattle–Sydney tickets usually cost?
Guide one-way economy totals cluster around $905, with sales near $509, in USD. Those are not a quote — live search is the price that matters.
Is SEA–SYD the only airport pair for this trip?
This guide uses SEA and SYD as the primary codes. If a seller offers another airport, it will show on live results when you include nearby airports.
Do I book Seattle–Sydney with Azurovia?
No. Azurovia is a US metasearch. You compare airline and travel-site totals here, then complete the ticket with the seller you choose.