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Cheap flights from Seattle to Sydney from $734

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 5/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
8 Feb — 15 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap 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 9 January 2026.

Round-trip from

$1,597

One-way from

$734

Popular in

December

Cheapest in

August

Average price

$1,943
Air Canada
  • Air Canada
  • 2/2-16/2
  • 3 total stops
  • 52h 36m total
  • Seattle to Sydney
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5/2
  • 5/2
  • 1 total stop
  • 25h 34m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($457 potential increase over avg. return price).
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Cheapest flight prices on average. 4% potential price decrease ($110 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 2026
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Find 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 9 January 2026.

Mon 2/220:00SEA - SYD
2 stops25h 40mAir Canada
Mon 16/211:20SYD - SEA
1 stop26h 56mAir Canada
Deal found 7/1$1,597
Sun 1/220:00SEA - SYD
2 stops25h 40mAir Canada
Wed 11/211:20SYD - SEA
1 stop22h 11mAir Canada
Deal found 8/1$1,598
Sun 19/421:15SEA - SYD
2 stops45h 40mMultiple Airlines
Thu 14/506:00SYD - SEA
2 stops29h 56mMultiple Airlines
Deal found 8/1$1,609
Tue 31/314:53SEA - SYD
2 stops23h 52mMultiple Airlines
Tue 14/411:55SYD - SEA
2 stops23h 56mMultiple Airlines
Deal found 7/1$1,615
Tue 10/315:52SEA - SYD
1 stop20h 18mQantas Airways
Tue 31/306:00SYD - SEA
2 stops34h 42mQantas Airways
Deal found 7/1$1,618
Mon 1/615:00SEA - SYD
2 stops26h 40mMultiple Airlines
Mon 29/606:00SYD - SEA
2 stops20h 17mMultiple Airlines
Deal found 7/1$1,619
Thu 5/210:51SEA - SYD
1 stop25h 34mMultiple Airlines
Mon 16/212:15SYD - SEA
2 stops45h 50mMultiple Airlines
Deal found 7/1$1,621
Thu 22/106:00SEA - SYD
1 stop32h 00mQantas Airways
Thu 29/107:05SYD - SEA
2 stops24h 24mQantas Airways
Deal found 8/1$1,627
Sat 14/220:00SEA - SYD
1 stop18h 35mAir Canada
Mon 2/311:20SYD - SEA
1 stop26h 56mAir Canada
Deal found 7/1$1,628
Sat 7/210:05SEA - SYD
1 stop28h 30mAir Canada
Sun 15/211:20SYD - SEA
1 stop16h 55mAir Canada
Deal found 8/1$1,630
Wed 8/406:00SEA - SYD
1 stop32h 30mMultiple Airlines
Mon 20/412:15SYD - SEA
2 stops44h 55mMultiple Airlines
Deal found 7/1$1,631

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 9 January 2026.
Use the filters below to find and compare flights from Seattle to Sydney that are best for you.

Fly from

Seattle

Fly to

Sydney

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 9/4

07:40-18:50

1 stop18h 10m

Sydney Kingsford Smith

Thu 23/4

20:45-21:42

1 stop17h 57m

$1,736

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 13/4

07:40-18:50

1 stop18h 10m

Sydney Kingsford Smith

Thu 16/4

20:45-06:00

1 stop26h 15m

$1,736

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 23/4

08:00-18:50

1 stop17h 50m

Sydney Kingsford Smith

Fri 8/5

20:45-06:00

1 stop26h 15m

$1,736

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 2/2

17:40-08:30

1 stop19h 50m

Sydney Kingsford Smith

Sun 15/2

10:40-12:33

2 stops20h 53m

$1,739

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 2/2

19:30-09:15

1 stop18h 45m

Sydney Kingsford Smith

Mon 9/2

14:00-15:44

1 stop20h 44m

$1,755

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 3/2

17:12-09:05

1 stop20h 53m

Sydney Kingsford Smith

Mon 9/2

11:20-21:12

2 stops28h 52m

$1,755

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 23/4

08:00-18:50

1 stop17h 50m

Sydney Kingsford Smith

Sat 2/5

20:45-09:17

2 stops29h 32m

$1,761

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 3/4

19:22-19:50

1 stop30h 28m

Sydney Kingsford Smith

Tue 21/4

20:45-21:53

1 stop18h 08m

$1,761

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 12/4

15:50-18:50

1 stop34h 00m

Sydney Kingsford Smith

Fri 17/4

20:45-06:00

1 stop26h 15m

$1,761

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 12/4

17:55-18:50

1 stop31h 55m

Sydney Kingsford Smith

Thu 16/4

20:45-21:41

1 stop17h 56m

$1,761

Flights are sorted by cheapest return flights first.

Deals found on 7/1

Showing 1-10 of 22 results
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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 2 January 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 50 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 $757). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,261). 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 9 January 2026.
Get a feel of what it's like to fly with United Airlines and Air Canada 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
9,143 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.
United Airlines
7.4
Good
9,143 reviews
United Airlines
7.4
Good
9,143 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.
Air Canada
7.1
Good
10,603 reviews
United Airlines
7.4
Good
9,143 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.

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?

    Alaska Airlines, Delta, and United Airlines can get you from Seattle to Sydney in just under 18h 10m. Your travel time can differ by up to 1h 40m. Airlines will cover a distance of 12463 km. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines flying from Seattle to Sydney round-trip?

    Flying on United Airlines is currently your cheapest option to Sydney, with prices starting at $1,192. Another option worth looking into is Air Canada, starting at $1,254 round trip. 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 Alaska Airlines ($526), Qantas Airways ($537), and ANA ($548).

  • 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 $757). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,261). 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
Terrigal
Katoomba
Manly
Lithgow
Randwick
Coogee
Leura
Cronulla
Bondi Beach

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 2 airlines flying from Seattle to Sydney

Discover the top 2 airlines 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 9 January 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,192Average$2,161FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest$1,254Average$1,717FlexibilityNo cancel feeOn-time67%
Search Air Canada 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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