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Cheap flights from Seattle to Sydney from $729

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 15/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
5 May — 12 May1
1 adult

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Sydney Kingsford Smith are usually found in March or February, booked 9 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 30 April 2025.

Round-trip from

$1,564

One-way from

$729

Popular in

December

Cheapest in

March

Average price

$1,747
11/6-18/6
  • 11/6-18/6
  • 2 total stops
  • 53h 49m total
  • Seattle to Sydney
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15/6
  • 15/6
  • 3 total stops
  • 33h 10m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($314 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease ($80 potential savings vs. average return price).
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Average for round-trip flights in April 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 30 April 2025.

Wed 11/615:55SEA - SYD
1 stop29h 45mMultiple Airlines
Wed 18/616:20SYD - SEA
1 stop24h 04mMultiple Airlines
Deal found 29/4$1,564
Sun 19/1023:35SEA - SYD
1 stop39h 25mPhilippine Airlines
Sun 26/1011:15SYD - SEA
1 stop26h 20mPhilippine Airlines
Deal found 29/4$1,664
Sat 14/609:45SEA - SYD
1 stop28h 10mUnited Airlines
Sun 22/610:20SYD - SEA
1 stop31h 39mUnited Airlines
Deal found 30/4$1,685
Mon 16/617:40SEA - SYD
1 stop19h 55mDelta
Sat 21/609:25SYD - SEA
1 stop22h 20mDelta
Deal found 29/4$1,700
Sat 6/917:59SEA - SYD
1 stop20h 31mQantas Airways
Sun 21/909:10SYD - SEA
1 stop27h 58mQantas Airways
Deal found 29/4$1,777
Fri 2/508:15SEA - SYD
1 stop18h 30mHawaiian Airlines
Sun 4/521:40SYD - SEA
1 stop19h 04mHawaiian Airlines
Deal found 29/4$1,799
Sun 7/913:45SEA - SYD
1 stop24h 35mAir Canada
Tue 16/907:30SYD - SEA
2 stops22h 35mAir Canada
Deal found 29/4$1,811
Wed 9/720:40SEA - SYD
1 stop30h 05mAlaska Airlines
Fri 18/721:40SYD - SEA
1 stop25h 20mAlaska Airlines
Deal found 29/4$1,817
Mon 11/814:50SEA - SYD
2 stops24h 55mAir New Zealand
Mon 25/808:45SYD - SEA
2 stops30h 30mAir New Zealand
Deal found 29/4$1,821
Wed 11/613:45SEA - SYD
2 stops26h 40mANA
Fri 20/620:55SYD - SEA
2 stops38h 41mANA
Deal found 29/4$1,892
Sat 27/1213:40SEA - SYD
2 stops27h 50mFiji Airways
Sat 17/114:10SYD - SEA
2 stops23h 45mFiji Airways
Deal found 28/4$2,239

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 30 April 2025.
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

Wed 11/6

15:55-14:40

1 stop29h 45m

Sydney Kingsford Smith

Wed 18/6

16:20-23:24

1 stop24h 04m

$1,564

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/10

23:35-09:00

1 stop39h 25m

Sydney Kingsford Smith

Sun 26/10

11:15-19:35

1 stop26h 20m

$1,664

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 14/6

12:44-07:00

2 stops25h 16m

Sydney Kingsford Smith

Sun 22/6

09:30-21:11

2 stops28h 41m

$1,685

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 16/6

17:40-06:35

1 stop19h 55m

Sydney Kingsford Smith

Sat 21/6

09:25-14:45

1 stop22h 20m

$1,700

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 6/9

17:59-07:30

1 stop20h 31m

Sydney Kingsford Smith

Sun 21/9

09:10-20:08

1 stop27h 58m

$1,777

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 8/8

08:15-19:45

1 stop18h 30m

Sydney Kingsford Smith

Fri 15/8

21:40-06:00

1 stop25h 20m

$1,799

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/8

08:15-19:45

1 stop18h 30m

Sydney Kingsford Smith

Sun 24/8

21:40-21:44

1 stop17h 04m

$1,808

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 7/9

13:45-07:20

1 stop24h 35m

Sydney Kingsford Smith

Tue 16/9

07:30-13:05

2 stops22h 35m

$1,811

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 11/8

14:50-08:45

2 stops24h 55m

Sydney Kingsford Smith

Mon 25/8

08:45-22:15

2 stops30h 30m

$1,821

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 11/6

13:45-09:25

2 stops26h 40m

Sydney Kingsford Smith

Fri 20/6

20:55-18:36

2 stops38h 41m

$1,892

Flights are sorted by cheapest return flights first.

Deals found on 29/4

Showing 1-10 of 27 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 25 April 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 9 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 30 April 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 30 April 2025.
To help decide which airline to fly from Seattle to Sydney, see what other customers have to say about Air Tahiti Nui, China Airlines and ANA. 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

Boarding

8.7

Entertainment

7.3

Crew

9.1

Food

7.8

Overall

8.8

Comfort

8.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

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

Boarding

8.7

Entertainment

7.3

Crew

9.1

Food

7.8

Overall

8.8

Comfort

8.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

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
8.3
Very Good
732 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Boarding

8.7

Entertainment

7.3

Crew

9.1

Food

7.8

Overall

8.8

Comfort

8.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

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
8.3
Very Good
852 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Boarding

8.7

Entertainment

7.3

Crew

9.1

Food

7.8

Overall

8.8

Comfort

8.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

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
8.2
Very Good
442 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Boarding

8.7

Entertainment

7.3

Crew

9.1

Food

7.8

Overall

8.8

Comfort

8.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

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

Boarding

8.7

Entertainment

7.3

Crew

9.1

Food

7.8

Overall

8.8

Comfort

8.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

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 Philippine Airlines is currently your cheapest option to Sydney, with prices starting at $1,664. Additional round-trip tickets that might be worth considering are offered by United Airlines and Delta, with the lowest prices starting at $1,685 and $1,700, respectively. Users have found that Philippine Airlines is 6% 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 Air Canada ($731), Qantas Airways ($737), and American Airlines ($801).

  • 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
Manly
Penrith
Coogee
Randwick
Terrigal
Cronulla
Lithgow
Bondi Beach
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 30 April 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,177Average$1,441FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest$1,312Average$1,655FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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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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