Find flights
When to book
Airlines
FAQs

Cheap flights from Seattle to Sydney from $739

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 14/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
20 Apr — 27 Apr1
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 15 April 2025.

Round-trip from

$1,360

One-way from

$739

Popular in

December

Cheapest in

March

Average price

$1,756
15/5-29/5
  • 15/5-29/5
  • 2 total stops
  • 60h 30m total
  • Seattle to Sydney
Search Deals
14/5
  • 14/5
  • 1 total stop
  • 25h 00m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($328 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($82 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 15 April 2025.

Thu 15/518:25SEA - SYD
1 stop27h 15mMultiple Airlines
Thu 29/516:20SYD - SEA
1 stop33h 15mMultiple Airlines
Deal found 14/4$1,360
Wed 17/923:35SEA - SYD
1 stop39h 25mPhilippine Airlines
Sun 5/1011:10SYD - SEA
1 stop26h 05mPhilippine Airlines
Deal found 14/4$1,499
Sat 18/1019:15SEA - SYD
1 stop19h 05mAir Canada
Thu 30/1010:20SYD - SEA
1 stop17h 30mAir Canada
Deal found 14/4$1,658
Wed 14/506:14SEA - SYD
1 stop31h 51mQantas Airways
Thu 14/817:45SYD - SEA
1 stop19h 04mQantas Airways
Deal found 14/4$1,742
Tue 26/813:45SEA - SYD
2 stops26h 40mANA
Tue 9/911:50SYD - SEA
2 stops23h 46mANA
Deal found 14/4$1,750
Mon 5/508:15SEA - SYD
1 stop18h 30mHawaiian Airlines
Thu 15/521:40SYD - SEA
1 stop25h 35mHawaiian Airlines
Deal found 15/4$1,762
Mon 5/508:15SEA - SYD
1 stop18h 30mAlaska Airlines
Tue 3/621:40SYD - SEA
2 stops25h 55mAlaska Airlines
Deal found 14/4$1,829
Sat 10/517:50SEA - SYD
2 stops46h 10mChina Eastern
Sat 24/511:00SYD - SEA
2 stops46h 45mChina Eastern
Deal found 14/4$1,846
Wed 23/717:14SEA - SYD
2 stops24h 21mAir New Zealand
Wed 30/709:55SYD - SEA
2 stops29h 11mAir New Zealand
Deal found 15/4$1,911
Thu 8/508:50SEA - SYD
2 stops29h 10mUnited Airlines
Wed 21/510:20SYD - SEA
1 stop25h 10mUnited Airlines
Deal found 15/4$1,938
Sat 14/605:30SEA - SYD
2 stops32h 05mDelta
Sat 28/609:25SYD - SEA
2 stops26h 04mDelta
Deal found 14/4$1,968

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 15 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

Thu 15/5

18:25-14:40

1 stop27h 15m

Sydney Kingsford Smith

Thu 29/5

16:20-08:35

1 stop33h 15m

$1,360

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 14/5

14:55-07:20

1 stop23h 25m

Sydney Kingsford Smith

Thu 14/8

07:30-13:01

2 stops22h 31m

$1,716

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 14/5

06:14-07:05

1 stop31h 51m

Sydney Kingsford Smith

Thu 14/8

17:45-19:49

1 stop19h 04m

$1,742

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 13/5

16:30-19:15

1 stop33h 45m

Sydney Kingsford Smith

Tue 20/5

11:50-18:33

2 stops23h 43m

$1,761

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/5

08:15-19:45

1 stop18h 30m

Sydney Kingsford Smith

Thu 15/5

21:40-06:15

1 stop25h 35m

$1,762

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 9/5

23:35-08:00

1 stop39h 25m

Sydney Kingsford Smith

Fri 16/5

10:10-19:15

1 stop26h 05m

$1,800

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/5

08:15-19:45

1 stop18h 30m

Sydney Kingsford Smith

Tue 3/6

21:40-06:35

2 stops25h 55m

$1,829

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 10/5

17:50-09:00

2 stops46h 10m

Sydney Kingsford Smith

Sat 24/5

11:00-16:45

2 stops46h 45m

$1,846

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 8/5

05:15-07:00

2 stops32h 45m

Sydney Kingsford Smith

Wed 21/5

09:30-21:02

2 stops28h 32m

$1,938

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 14/6

05:30-06:35

2 stops32h 05m

Sydney Kingsford Smith

Sat 28/6

09:25-18:29

2 stops26h 04m

$1,968

Flights are sorted by cheapest return flights first.

Deals found on 15/4

Showing 1-10 of 28 results
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 11 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 15 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 15 April 2025.
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Crew

9.1

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.8

Food

7.8

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

Crew

9.1

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.8

Food

7.8

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

Crew

9.1

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.8

Food

7.8

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

Crew

9.1

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.8

Food

7.8

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

Crew

9.1

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.8

Food

7.8

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
8.0
Very Good
183 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Crew

9.1

Boarding

8.7

Comfort

8.1

Entertainment

7.3

Overall

8.8

Food

7.8

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 Air Canada is currently your cheapest option to Sydney, with prices starting at $1,716. Additional round-trip tickets that might be worth considering are offered by Qantas Airways and ANA, with the lowest prices starting at $1,742 and $1,761, respectively. Users have found that Air Canada is 4% 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 Philippine Airlines ($947), Alaska Airlines ($1,100), and Qantas Airways ($1,102).

  • 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 15 April 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,194Average$1,462FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest$1,331Average$1,678FlexibilityNo 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights