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Cheap flights from Seattle to Sydney from $551

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
1 Apr — 8 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Sydney

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Sydney
Explore the most affordable flight options available from Seattle to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 March 2026.

Thu 10/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 6/1011:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 2/3$987
Mon 1/616:30
SEA
-
SYD
1 stop33h 45m
ANA
Sun 14/620:55
SYD
-
SEA
1 stop34h 30m
ANA
Deal found 26/2$1,026
Wed 2/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 15/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 1/3$1,110
Fri 18/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Wed 30/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 26/2$1,148
Fri 11/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 6/1011:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 1/3$1,150
Wed 9/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 22/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 26/2$1,164
Fri 11/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Wed 7/1011:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 1/3$1,168
Fri 11/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Thu 17/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 26/2$1,206
Mon 1/615:20
SEA
-
SYD
2 stops22h 45m
American Airlines
Mon 29/609:10
SYD
-
SEA
1 stop21h 47m
American Airlines
Deal found 27/2$1,230
Sun 12/414:57
SEA
-
SYD
2 stops23h 08m
American Airlines
Sun 26/409:10
SYD
-
SEA
1 stop25h 57m
American Airlines
Deal found 26/2$1,231

Find flight deals from Seattle to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 2 March 2026.

Round-trip from

$1,026

One-way from

$551

Popular in

December

Cheapest in

August

Average price

$1,404
ANA
  • ANA
  • 1/6-14/6
  • 2 total stops
  • 68h 15m total
  • Seattle to Sydney
Search Deals
Philippine Airlines
  • Philippine Airlines
  • 10/3
  • 1 total stop
  • 41h 20m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($404 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($100 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Seattle to Sydney that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 2 March 2026.
Use the filters below to find and compare flights from Seattle to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 31/5

18:48-06:55

1 stop19h 07m

Sydney Kingsford Smith

Mon 29/6

10:20-14:30

1 stop21h 10m

$1,257

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 18/4

17:45-06:55

1 stop20h 10m

Sydney Kingsford Smith

Mon 11/5

09:30-21:06

2 stops28h 36m

$1,330

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 30/4

16:36-06:50

2 stops21h 14m

Sydney Kingsford Smith

Tue 19/5

09:15-22:03

2 stops29h 48m

$1,332

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 30/4

16:36-06:50

2 stops21h 14m

Sydney Kingsford Smith

Sun 17/5

09:15-16:44

2 stops24h 29m

$1,332

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 24/7

18:55-06:50

1 stop18h 55m

Sydney Kingsford Smith

Fri 7/8

09:15-20:28

1 stop28h 13m

$1,391

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 1/8

13:30-06:50

2 stops24h 20m

Sydney Kingsford Smith

Fri 14/8

09:15-18:29

2 stops26h 14m

$1,397

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 13/5

07:35-18:50

1 stop18h 15m

Sydney Kingsford Smith

Sun 17/5

20:45-06:00

1 stop26h 15m

$1,642

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 13/5

07:35-18:50

1 stop18h 15m

Sydney Kingsford Smith

Sun 17/5

20:45-21:53

1 stop18h 08m

$1,643

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 13/5

12:51-06:55

2 stops25h 04m

Sydney Kingsford Smith

Sun 17/5

09:30-18:00

2 stops25h 30m

$1,781

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 18/5

10:42-12:05

2 stops32h 23m

$588

Flights are sorted by cheapest return flights first.

Deals found on 1/3

Showing 1-10 of 18 resultsSorted by cheapest first
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Best time to book a flight from Seattle to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Seattle with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Sydney

How far ahead should I book a flight from Seattle to Sydney?

Use this chart to determine the optimal time to book a return flight from Seattle to Sydney. Price data was last updated on 27 February 2026.

The price you pay for your flight from Seattle to Sydney may vary depending on when you book. For the best chance of a lower fare, look to book 24 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Seattle to Sydney?

Currently, July is the cheapest month in which you can book a flight from Seattle to Sydney (average of $697). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,188). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sydney. Reviews last updated 2 March 2026.
Get a feel of what it's like to fly with United Airlines from Seattle to Sydney by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,375 reviews
Check prices

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Crew

8.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,375 reviews
United Airlines
7.4
Good
9,375 reviews
Check prices

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Crew

8.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

Find useful and relevant information for your journey from Seattle to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Sydney?

    United Airlines and Delta can get you from Seattle to Sydney in just under 19h 07m. Your travel time can differ by up to 2h 07m. Airlines will cover a distance of 12463 km. Both multi-stop and direct flights can be found to your destination and back.

  • What is the cheapest airline to fly from Seattle to Sydney round-trip?

    Flying on United Airlines is currently your cheapest option to Sydney, with prices starting at $1,123. Users have found that United Airlines is 25% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Seattle to Sydney one-way?

    The cheapet airlines for a one-way flight from Seattle to Sydney are ANA ($516), Qantas Airways ($519), and United Airlines ($564).

  • Can I find deals for flights from Seattle to Sydney that include hotel bookings?

    Yes. In addition to deals on Seattle to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Sydney.

  • Can I find deals for business class flights from Seattle to Sydney?

    Yes. Cheapflights offers flight deals from Seattle to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Sydney?

    Currently, July is the cheapest month in which you can book a flight from Seattle to Sydney (average of $697). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,188). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Penrith
Katoomba
Manly
Terrigal
Lithgow
Bondi Beach
Leura
Coogee
Cronulla
Randwick

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seattle to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Sydney flights
Spokane to Sydney flights
Seattle to Coolangatta flights
Portland to Coolangatta flights

Top airline flying from Seattle to Sydney

Discover the top airline that operate flights from Seattle to Sydney. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 2 March 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,123Average$2,140FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Sydney?

Deals for Seattle to Sydney flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Sydney?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Sydney for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Seattle to Sydney with no change fees?

Need flexible booking options for your flight to Sydney from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Sydney become cheaper?

Yes, Cheapflights offers price alerts on Seattle to Sydney flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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