Seattle to Sydney flights
Routavio compares airline fares from several flight booking sites. The lowest one-way fare it found for Seattle to Sydney is €450 with Alaska Airlines (checked on 19 Oct 2026).
Your next trip, last seen at €450
Lowest observedAlaska Airlines · 1 stop · One wayWhen to fly
Explore datesMore dates worth a look
Find the dates that work for you
The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.
One-way fare
- Lowest observed
- €450, departing 10 Dec 2026 (Last checked: 19 Oct 2026)One-way fareCheck live prices for this route
- Round trip
- €1,143, departing 22 Nov 2026, back 29 Nov 2026 (Last checked: 26 Oct 2026)
- Airlines seen
- Alaska Airlines, ANA, Cathay Pacific, Fiji Airways, Hainan Airlines, Korean Air, Philippine Airlines, Qantas, Scoot, Singapore Airlines, Transnusa, United Airlines (12)
- Typical journey time
- 19h 55m
About this route
Explore the fares we observed from Seattle to Sydney. Prices move often, so pick your dates to see the latest options.
- Route distance
- 12,470 km
- Typical journey time
- 19h 55m
- Seen on fares with a connection
- Alaska Airlines, Qantas, United Airlines, Korean Air, Singapore Airlines
- Alternative airports
- BFI, WSI
Route-level information; individual journeys vary.
We have not observed non-stop service on this route; the fares shown include at least one stop.
A clearer picture of your fare
If the observed fare for this date drops, we will email you. At most one message a day.
Airport to city: straight-line distance
- King County International Airport - Boeing Field (BFI) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 9 km.
- Seattle–Tacoma International Airport (SEA) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 18 km.
- Sydney Kingsford Smith International Airport (SYD) → Sydney, city gazetteer reference point (-33.8689, 151.2071): ≈ 9 km.
Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.
Lowest one-way fare we saw per airline
Cheapest airline from Seattle to Sydney: Alaska Airlines, from €450 (checked 19 Oct 2026).
| Airline | Lowest fare | Priced days |
|---|---|---|
| Alaska Airlines | €450Dec 10, 2026 | 48 |
| Qantas | €541Nov 3, 2026 | 10 |
| United Airlines | €546Nov 30, 2026 | 6 |
| Korean Air | €718Jan 18, 2027 | 3 |
One-way fares checked in the last 14 days. An airline listed here had a fare on at least 3 departure days. Each figure is the lowest we saw, not a guaranteed fare. Connecting itineraries are included; the date is the departure day of that fare.
Frequently asked
How much is a flight from Seattle to Sydney?
The lowest fare Routavio has observed is €450, found on 19 Oct 2026. Prices move, so read it as a floor rather than a quote.
When is the cheapest month to fly from Seattle to Sydney?
In our observations December 2026 is the cheapest month so far, at €450.
Are there direct flights from Seattle to Sydney?
Our data holds no non-stop flight from Seattle to Sydney. The fares on this page include at least one stop.
Which airlines fly from Seattle to Sydney?
Routavio has seen these carriers on the route: Alaska Airlines, ANA, Cathay Pacific, Fiji Airways, Hainan Airlines, Korean Air, Philippine Airlines, Qantas, Scoot, Singapore Airlines, Transnusa, United Airlines (12).
How long does the flight from Seattle to Sydney take?
Across the 74 fares Routavio observed, the average journey time is 24h 28m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.
How many of the observed Seattle to Sydney fares were non-stop?
None of the 76 fares we observed was non-stop; every one included at least one stop. That describes our observations, not every flight that operates.
How much is a round trip from Seattle to Sydney?
Cheapest round trip: €1,143, departing 22 Nov 2026, back 29 Nov 2026 (checked 26 Oct 2026).
Which airline has the lowest fare from Seattle to Sydney?
Cheapest airline from Seattle to Sydney: Alaska Airlines, from €450 (checked 19 Oct 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide · Price and schedule freshness on Routavio
Keep exploring
Similar routes
More routes from Seattle
Show all 36 routes →Show fewer ↑
More routes to Sydney
Show all 30 routes →Show fewer ↑
Recently observed fares. Prices may change.