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Cheap flights from Seattle to Sydney from $684

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 20/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
13 Jul — 20 Jul1
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 13 June 2026.

Thu 26/1123:55
SEA
-
SYD
1 stop38h 50m
Philippine Airlines
Wed 9/1211:35
SYD
-
SEA
1 stop27h 00m
Philippine Airlines
Deal found 10/6$1,410
Wed 4/1119:05
SEA
-
SYD
1 stop19h 30m
Air Canada
Mon 30/1111:20
SYD
-
SEA
1 stop16h 57m
Air Canada
Deal found 10/6$1,461
Mon 27/719:20
SEA
-
SYD
1 stop19h 00m
Air Canada
Sun 9/809:20
SYD
-
SEA
1 stop22h 02m
Air Canada
Deal found 11/6$1,477
Mon 27/705:45
SEA
-
SYD
1 stop32h 35m
Air Canada
Mon 3/809:20
SYD
-
SEA
1 stop30h 22m
Air Canada
Deal found 12/6$1,480
Tue 28/710:45
SEA
-
SYD
1 stop27h 35m
Air Canada
Tue 11/809:20
SYD
-
SEA
1 stop22h 02m
Air Canada
Deal found 10/6$1,481
Sun 25/1019:05
SEA
-
SYD
1 stop19h 30m
Air Canada
Sun 15/1111:20
SYD
-
SEA
1 stop16h 57m
Air Canada
Deal found 13/6$1,498
Wed 7/1010:30
SEA
-
SYD
1 stop27h 50m
Air Canada
Tue 20/1010:20
SYD
-
SEA
1 stop22h 02m
Air Canada
Deal found 10/6$1,499
Wed 11/1110:10
SEA
-
SYD
1 stop28h 25m
Air New Zealand
Mon 30/1111:20
SYD
-
SEA
1 stop29h 37m
Air New Zealand
Deal found 10/6$1,501
Mon 27/719:20
SEA
-
SYD
1 stop19h 00m
Multiple Airlines
Sun 9/806:00
SYD
-
SEA
2 stops25h 22m
Multiple Airlines
Deal found 11/6$1,502
Mon 27/719:20
SEA
-
SYD
1 stop19h 00m
Multiple Airlines
Mon 3/806:00
SYD
-
SEA
2 stops21h 07m
Multiple Airlines
Deal found 12/6$1,506
Tue 28/710:45
SEA
-
SYD
1 stop27h 35m
Multiple Airlines
Tue 11/806:00
SYD
-
SEA
2 stops21h 07m
Multiple Airlines
Deal found 10/6$1,508
Mon 3/810:45
SEA
-
SYD
1 stop27h 35m
Multiple Airlines
Sun 16/806:00
SYD
-
SEA
2 stops25h 22m
Multiple Airlines
Deal found 9/6$1,511

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 13 June 2026.

Round-trip from

$1,410

One-way from

$684

Popular in

December

Cheapest in

August

Average price

$1,417
Philippine Airlines
  • Philippine Airlines
  • 26/11-9/12
  • 2 total stops
  • 65h 50m total
  • Seattle to Sydney
Search Deals
Philippine Airlines
  • Philippine Airlines
  • 20/8
  • 1 total stop
  • 39h 50m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($413 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($103 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 13 June 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

Mon 6/7

12:35-06:50

1 stop25h 15m

Sydney Kingsford Smith

Sat 15/8

09:15-20:30

1 stop28h 15m

$1,657
Fastest return journey

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 22/10

07:00-18:50

1 stop17h 50m

Sydney Kingsford Smith

Sun 15/11

21:40-00:04

2 stops21h 24m

$1,799

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 1/7

05:30-06:50

2 stops32h 20m

Sydney Kingsford Smith

Mon 6/7

09:15-18:36

2 stops26h 21m

$1,864

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 1/10

05:25-06:50

2 stops32h 25m

Sydney Kingsford Smith

Sat 31/10

09:40-16:53

2 stops25h 13m

$2,017

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 7/10

11:05-08:00

2 stops26h 55m

Sydney Kingsford Smith

Tue 20/10

10:30-23:26

3 stops30h 56m

$2,045

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 11/7

15:10-06:50

1 stop22h 40m

Sydney Kingsford Smith

Sat 18/7

09:15-16:40

1 stop24h 25m

$2,051

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 11/7

05:00-07:00

2 stops33h 00m

Sydney Kingsford Smith

Sat 18/7

09:30-01:13

3 stops32h 43m

$2,176

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 24/10

15:18-19:35

3 stops58h 17m

Sydney Kingsford Smith

Fri 13/11

21:30-17:10

2 stops38h 40m

$2,505

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 24/8

17:02-09:35

2 stops23h 33m

Sydney Kingsford Smith

Wed 26/8

15:45-22:59

2 stops24h 14m

$2,770

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 24/10

15:29-19:35

3 stops58h 06m

Sydney Kingsford Smith

Sun 1/11

21:30-22:29

3 stops67h 59m

$2,882

Flights are sorted by cheapest return flights first.

Deals found on 11/6

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

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?

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 23 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 $1,108). Flying from Seattle to Sydney in December is currently the most expensive (average of $2,285). 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 13 June 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
9,815 reviews
Check prices

Comfort

7.3

Overall

7.4

Entertainment

7.1

Crew

8.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,815 reviews
United Airlines
7.4
Good
9,815 reviews
Check prices

Comfort

7.3

Overall

7.4

Entertainment

7.1

Crew

8.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

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 30h 53m. Your travel time can differ by up to 1h 27m. 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 $1,133. 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 ($521), Qantas Airways ($524), and United Airlines ($569).

  • 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 $1,108). Flying from Seattle to Sydney in December is currently the most expensive (average of $2,285). 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
Cronulla
Manly
Terrigal
Lithgow
Randwick
Bondi Beach
Leura
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
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 13 June 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,133Average$2,160FlexibilityNo 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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