S$850 Cheap Flights from Seattle to Sydney

View S$850 flight on Wed, 6 May, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Sydney Airport (SYD)

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Cheap Flights from Seattle to Sydney (SEA-SYD)

Prices were available within the past 7 days and start at S$850 for one-way flights and S$1,546 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, 26 Apr - Sun, 10 May
SEA
Seattle
SYD
Sydney
S$1,546 Return, found 7 hours ago
S$1,546
Return
found 7 hours ago
Select United flight, departing Sun, 26 Apr from Seattle to Sydney, returning Sun, 10 May, priced at S$1,546 found 7 hours ago
Delta
Sun, 26 Apr - Sun, 10 May
SEA
Seattle
SYD
Sydney
S$1,572 Return, found 7 hours ago
S$1,572
Return
found 7 hours ago
Select Delta flight, departing Sun, 26 Apr from Seattle to Sydney, returning Sun, 10 May, priced at S$1,572 found 7 hours ago
Alaska Airlines
Sun, 26 Apr - Sun, 10 May
SEA
Seattle
SYD
Sydney
S$1,605 Return, found 7 hours ago
S$1,605
Return
found 7 hours ago
Select Alaska Airlines flight, departing Sun, 26 Apr from Seattle to Sydney, returning Sun, 10 May, priced at S$1,605 found 7 hours ago
Alaska Airlines
Sun, 26 Apr - Sun, 10 May
SEA
Seattle
SYD
Sydney
S$1,794 Return, found 7 hours ago
S$1,794
Return
found 7 hours ago
Select Alaska Airlines flight, departing Sun, 26 Apr from Seattle to Sydney, returning Sun, 10 May, priced at S$1,794 found 7 hours ago
Delta
Sun, 26 Apr - Sun, 10 May
SEA
Seattle
SYD
Sydney
S$1,798 Return, found 7 hours ago
S$1,798
Return
found 7 hours ago
Select Delta flight, departing Sun, 26 Apr from Seattle to Sydney, returning Sun, 10 May, priced at S$1,798 found 7 hours ago
Delta
Sun, 26 Apr - Sun, 10 May
SEA
Seattle
SYD
Sydney
S$1,805 Return, found 7 hours ago
S$1,805
Return
found 7 hours ago
Select Delta flight, departing Sun, 26 Apr from Seattle to Sydney, returning Sun, 10 May, priced at S$1,805 found 7 hours ago
Qantas Airways
Sun, 26 Apr - Sun, 10 May
SEA
Seattle
SYD
Sydney
S$1,808 Return, found 7 hours ago
S$1,808
Return
found 7 hours ago
Select Qantas Airways flight, departing Sun, 26 Apr from Seattle to Sydney, returning Sun, 10 May, priced at S$1,808 found 7 hours ago
Alaska Airlines
Sun, 26 Apr - Sun, 10 May
SEA
Seattle
SYD
Sydney
S$1,875 Return, found 7 hours ago
S$1,875
Return
found 7 hours ago
Select Alaska Airlines flight, departing Sun, 26 Apr from Seattle to Sydney, returning Sun, 10 May, priced at S$1,875 found 7 hours ago
United
Sun, 26 Apr - Sun, 10 May
SEA
Seattle
SYD
Sydney
S$1,877 Return, found 7 hours ago
S$1,877
Return
found 7 hours ago
Select United flight, departing Sun, 26 Apr from Seattle to Sydney, returning Sun, 10 May, priced at S$1,877 found 7 hours ago
American Airlines
Sun, 26 Apr - Sun, 10 May
SEA
Seattle
SYD
Sydney
S$1,955 Return, found 7 hours ago
S$1,955
Return
found 7 hours ago
Select American Airlines flight, departing Sun, 26 Apr from Seattle to Sydney, returning Sun, 10 May, priced at S$1,955 found 7 hours ago

Find the cheapest month to fly from Seattle (SEA) to Sydney (SYD)

September is typically the cheapest month to fly

From S$967 - S$1,637 per traveller.

Frequently asked questions

How much is a flight from SEA to SYD?
Based on fares listed within the last 7 days on Expedia for flights departing within the next year, round-trip flights between Seattle - Tacoma Intl. Airport (SEA) and Kingsford Smith Intl. Airport (SYD) start from S$1,546. Make your booking ASAP to secure the best price for your big adventure. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from SEA to Sydney Airport?
This varies from airline to airline, as each has its own terms and conditions. Head to the Customer Service Portal, where there are easy-to-follow instructions on how to cancel your flight online.
How do I find cheap flights from Sea-Tac Airport to Mascot Airport that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Seattle - Tacoma Intl. Airport (SEA) to SYD flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Sea-Tac Airport to Kingsford Smith Intl. Airport (SYD)?
The distance is around 12,500 kilometres. Eye mask? Check. Noise-cancelling headphones? Double check. You'd be wise to pack all the essentials for this long-haul SeaTac to Sydney flight.
Which airlines fly direct from SEA to Mascot Airport?
Unfortunately, there are no airlines that directly fly between Seattle - Tacoma Intl. Airport (SEA) and SYD. You'll have to book a flight with at least one stop.
Are SEA to SYD flight tickets cheaper when they're purchased at the last minute?
Booking your trip from Seattle - Tacoma Intl. Airport (SEA) to SYD at the last minute could be your ticket to an awesome deal. However, it might cost you a whole lot more! If you'd prefer not to take any chances, book well ahead of your departure date. In fact, Expedia has some of the biggest bargains as far ahead as 12 months in advance. If your preferred carrier hasn't released tickets yet, check back regularly as deals are updated all the time on Expedia.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Kingsford Smith Intl.
Airlines serving
Air Canada, Air New Zealand, All Nippon Airways, American Airlines, Delta, Emirates, Philippine Airlines, United
Return price
S$1,546
Distance
12399 km

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