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Cheap flights from Seattle to Sydney from $633

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 6/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
17 May — 24 May1
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 17 April 2026.

Sun 1/1123:55
SEA
-
SYD
1 stop38h 50m
Philippine Airlines
Mon 30/1111:35
SYD
-
SEA
1 stop26h 00m
Philippine Airlines
Deal found 16/4$965
Fri 4/923:10
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Sun 13/910:15
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 16/4$1,234
Wed 27/511:21
SEA
-
SYD
2 stops31h 29m
Multiple Airlines
Wed 3/613:20
SYD
-
SEA
3 stops37h 46m
Multiple Airlines
Deal found 15/4$1,320
Sun 10/506:10
SEA
-
SYD
1 stop31h 55m
American Airlines
Sun 24/512:00
SYD
-
SEA
1 stop21h 44m
American Airlines
Deal found 16/4$1,352
Sun 3/518:40
SEA
-
SYD
1 stop19h 50m
American Airlines
Sun 17/509:10
SYD
-
SEA
1 stop25h 57m
American Airlines
Deal found 12/4$1,357
Sun 2/814:20
SEA
-
SYD
1 stop24h 10m
American Airlines
Wed 19/809:10
SYD
-
SEA
1 stop18h 45m
American Airlines
Deal found 14/4$1,364
Sun 17/515:00
SEA
-
SYD
1 stop22h 50m
Delta
Tue 2/609:15
SYD
-
SEA
1 stop18h 40m
Delta
Deal found 13/4$1,368
Wed 13/514:57
SEA
-
SYD
2 stops23h 08m
American Airlines
Sun 31/512:00
SYD
-
SEA
1 stop24h 17m
American Airlines
Deal found 13/4$1,369
Mon 18/514:57
SEA
-
SYD
2 stops23h 08m
American Airlines
Wed 3/612:00
SYD
-
SEA
1 stop21h 44m
American Airlines
Deal found 16/4$1,370
Tue 2/611:43
SEA
-
SYD
1 stop26h 12m
American Airlines
Wed 17/609:10
SYD
-
SEA
1 stop29h 39m
American Airlines
Deal found 15/4$1,373
Sun 17/509:25
SEA
-
SYD
2 stops28h 25m
Delta
Wed 3/609:15
SYD
-
SEA
1 stop18h 40m
Delta
Deal found 13/4$1,375

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 17 April 2026.

Round-trip from

$1,234

One-way from

$633

Popular in

December

Cheapest in

August

Average price

$1,447
Philippine Airlines
  • Philippine Airlines
  • 4/9-13/9
  • 2 total stops
  • 66h 40m total
  • Seattle to Sydney
Search Deals
6/5
  • 6/5
  • 2 total stops
  • 31h 44m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($409 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($95 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 17 April 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

Cheapest return flight

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 10/5

10:50-06:50

2 stops27h 00m

Sydney Kingsford Smith

Wed 20/5

09:15-15:23

2 stops23h 08m

$1,375

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 10/5

09:25-06:50

2 stops28h 25m

Sydney Kingsford Smith

Sat 13/6

09:15-22:19

1 stop30h 04m

$1,430

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 14/5

19:59-06:50

2 stops41h 51m

Sydney Kingsford Smith

Fri 12/6

09:15-23:59

1 stop31h 44m

$1,475

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 10/5

16:32-07:00

1 stop21h 28m

Sydney Kingsford Smith

Sun 24/5

09:30-21:09

2 stops28h 39m

$1,521

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/5

10:15-06:50

1 stop27h 35m

Sydney Kingsford Smith

Wed 13/5

09:15-15:05

1 stop22h 50m

$1,532

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 1/6

17:35-06:50

1 stop20h 15m

Sydney Kingsford Smith

Mon 8/6

09:15-16:47

1 stop24h 32m

$1,534

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 28/4

10:15-06:50

1 stop27h 35m

Sydney Kingsford Smith

Sun 17/5

09:15-23:55

1 stop31h 40m

$1,542
Fastest return journey

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 25/4

13:30-06:50

2 stops24h 20m

Sydney Kingsford Smith

Mon 25/5

09:15-10:55

1 stop18h 40m

$1,607

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/5

10:00-18:50

1 stop39h 50m

Sydney Kingsford Smith

Tue 12/5

20:45-06:00

1 stop26h 15m

$1,635

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 25/4

15:48-07:00

2 stops46h 12m

Sydney Kingsford Smith

Mon 25/5

09:30-22:39

2 stops30h 09m

$1,729

Flights are sorted by cheapest return flights first.

Deals found on 12/4

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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 10 April 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, August is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,133). Flying from Seattle to Sydney in December is currently the most expensive (average of $2,206). 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.

How much does it cost for a return flight from Seattle to Sydney?

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 17 April 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
9,602 reviews
Check prices

Overall

7.4

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,602 reviews
United Airlines
7.4
Good
9,602 reviews
Check prices

Overall

7.4

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

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?

    Delta and United Airlines can get you from Seattle to Sydney in just under 21h 28m. Your travel time can differ by up to 5h 32m. 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 $1,114. Users have found that United Airlines is 24% 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 ($512), Qantas Airways ($515), and United Airlines ($559).

  • 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, August is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,133). Flying from Seattle to Sydney in December is currently the most expensive (average of $2,206). 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
Terrigal
Lithgow
Cronulla
Manly
Bondi Beach
Leura
Randwick
Coogee

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
Seattle to Coolangatta flights
Spokane to Sydney 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 17 April 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,114Average$2,123FlexibilityNo 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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