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Cheap flights from Seattle to Sydney from $668

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 7/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
22 tammi — 29 tammi1
1 adult

The best prices from Seattle/Tacoma Intl to Sydney Kingsford Smith are usually found in March or February, booked 37 days in advance, depart on a Monday or Wednesday and return on a Thursday

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 17 tammikuu 2025.

Round-trip from

$1,431

One-way from

$668

Popular in

December

Cheapest in

March

Average price

$1,910
3/2-10/2
  • 3/2-10/2
  • 4 total stops
  • 52h 27m total
  • Seattle to Sydney
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7/2
  • 7/2
  • 2 total stops
  • 36h 52m total
  • Seattle to Sydney
Search Deals
High demand for flights, 9% potential price rise
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Best time to find cheap flights, 2% potential price drop
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Average for round-trip flights in January 2025
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Find flight deals from Seattle to Sydney

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 tammikuu 2025.

ma 3/215:05SEA - SYD
2 stops30h 35mMultiple Airlines
ma 10/207:05SYD - SEA
2 stops21h 52mMultiple Airlines
Deal found 16/1$1,431
su 9/219:05SEA - SYD
2 stops24h 35mAir Canada
ma 17/208:30SYD - SEA
2 stops20h 27mAir Canada
Deal found 17/1$1,439
su 2/1110:35SEA - SYD
2 stops38h 40mANA
su 9/1121:45SYD - SEA
1 stop34h 35mANA
Deal found 16/1$1,445
ma 3/307:00SEA - SYD
1 stop17h 45mAlaska Airlines
ti 11/321:40SYD - SEA
1 stop18h 15mAlaska Airlines
Deal found 17/1$1,522
ke 5/218:31SEA - SYD
1 stop30h 14mHawaiian Airlines
ti 4/321:40SYD - SEA
1 stop29h 14mHawaiian Airlines
Deal found 16/1$1,559
pe 14/323:35SEA - SYD
1 stop39h 55mPhilippine Airlines
su 30/311:10SYD - SEA
1 stop26h 10mPhilippine Airlines
Deal found 16/1$1,651
su 9/206:00SEA - SYD
1 stop32h 00mAmerican Airlines
ma 17/211:15SYD - SEA
1 stop31h 09mAmerican Airlines
Deal found 17/1$1,653
su 2/310:15SEA - SYD
1 stop27h 20mDelta
su 16/310:05SYD - SEA
1 stop22h 34mDelta
Deal found 16/1$1,704

Find flights from Seattle to Sydney within your budget

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 tammikuu 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

ma 3/2

15:05-16:40

2 stops30h 35m

Sydney Kingsford Smith

ma 10/2

07:05-09:57

2 stops21h 52m

$1,431

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

su 9/2

19:05-14:40

2 stops24h 35m

Sydney Kingsford Smith

ma 17/2

08:30-09:57

2 stops20h 27m

$1,439

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

ti 20/5

13:45-09:25

2 stops26h 40m

Sydney Kingsford Smith

to 5/6

11:50-18:33

2 stops23h 43m

$1,445

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

ma 3/3

07:00-19:45

1 stop17h 45m

Sydney Kingsford Smith

ti 11/3

21:40-21:55

1 stop18h 15m

$1,522

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

ke 5/2

18:31-19:45

1 stop30h 14m

Sydney Kingsford Smith

ti 4/3

21:40-07:54

1 stop29h 14m

$1,559

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

pe 14/3

23:35-09:30

1 stop39h 55m

Sydney Kingsford Smith

su 30/3

11:10-19:20

1 stop26h 10m

$1,651

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

su 9/2

06:00-09:00

1 stop32h 00m

Sydney Kingsford Smith

ma 17/2

11:15-23:24

1 stop31h 09m

$1,653

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

su 2/3

10:15-08:35

1 stop27h 20m

Sydney Kingsford Smith

su 16/3

10:05-14:39

1 stop22h 34m

$1,704

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

pe 7/2

13:58-21:50

2 stops36h 52m

$668

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

to 27/2

07:00-19:45

1 stop17h 45m

$904

Flights are sorted by cheapest return flights first.

Deals found on 16/1

Showing 1-10 of 23 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.

Travel insights for flights from Seattle to Sydney

Get recent, data-driven insights about flights from Seattle to Sydney including ideal travel times, pricing trends, and more.

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 January 2025.

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 37 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, May is the cheapest month in which you can book a flight from Seattle to Sydney (average of $129). Flying from Seattle to Sydney in October is currently the most expensive (average of $171). 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.

What is the cheapest time of day to fly from SEA to SYD?

Find hourly flight availability from Seattle to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 17 tammikuu 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Sydney at midday. If you’re flexible enough to do this you can expect to save up to 19% on your trip compared to booking a flight in the morning.

Rainfall in Sydney by month

Plan your trip to Sydney by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Sydney ranges from 50.0 - 130.0 inches per month. March is typically the wettest month, when rainfall can reach 130.0 mm. September is typically the driest time to visit Sydney when rainfall is around 50.0 mm.

Temperature in Sydney by month

Plan your trip to Sydney by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Sydney, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 22.0 C. Travellers hoping to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 11.0 C).

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 tammikuu 2025.
To help decide which airline to fly from Seattle to Sydney, see what other customers have to say about Alaska Airlines and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Entertainment

7.3

Overall

8.8

Crew

9.1

Comfort

8.1

Boarding

8.7

Food

7.8

Reviews

1 / 2

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

Air Tahiti Nui
8.8
Very Good
62 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Entertainment

7.3

Overall

8.8

Crew

9.1

Comfort

8.1

Boarding

8.7

Food

7.8

Reviews

1 / 2

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

ANA
8.4
Very Good
847 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Entertainment

7.3

Overall

8.8

Crew

9.1

Comfort

8.1

Boarding

8.7

Food

7.8

Reviews

1 / 2

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

Asiana Airlines
8.3
Very Good
466 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Entertainment

7.3

Overall

8.8

Crew

9.1

Comfort

8.1

Boarding

8.7

Food

7.8

Reviews

1 / 2

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

China Airlines
8.2
Very Good
737 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Entertainment

7.3

Overall

8.8

Crew

9.1

Comfort

8.1

Boarding

8.7

Food

7.8

Reviews

1 / 2

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

Fiji Airways
8.1
Very Good
187 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Entertainment

7.3

Overall

8.8

Crew

9.1

Comfort

8.1

Boarding

8.7

Food

7.8

Reviews

1 / 2

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

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.

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

    Flying on Air Canada is currently your cheapest option to Sydney, with prices starting at $1,439. Additional round-trip tickets that might be worth considering are offered by ANA and Alaska Airlines, with the lowest prices starting at $1,445 and $1,522, respectively. Users have found that Air Canada is 20% 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 Hawaiian Airlines ($904), Alaska Airlines ($932), and Air Canada ($954).

  • 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, May is the cheapest month in which you can book a flight from Seattle to Sydney (average of $129). Flying from Seattle to Sydney in October is currently the most expensive (average of $171). 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 Seattle?

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

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 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 17 tammikuu 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,213Average$1,643FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest$1,288Average$1,623FlexibilityNo 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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