Find flights
When to book
Airlines
FAQs

Cheap flights from Seattle to Sydney from $460

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 9/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
14 Nov — 21 Nov1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Sydney Kingsford Smith are usually found in September or February, booked 2 days in advance, depart on a Monday or Wednesday and return on a Thursday

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 15 October 2025.

Wed 29/1022:30SEA - SYD
1 stop41h 20mPhilippine Airlines
Fri 7/1111:35SYD - SEA
1 stop26h 05mPhilippine Airlines
Deal found 14/10$1,305
Fri 24/1023:35SEA - SYD
1 stop40h 15mPhilippine Airlines
Sun 2/1111:35SYD - SEA
1 stop26h 05mPhilippine Airlines
Deal found 14/10$1,307
Thu 16/1007:44SEA - SYD
1 stop18h 01mHawaiian Airlines
Thu 30/1021:40SYD - SEA
1 stop19h 16mHawaiian Airlines
Deal found 13/10$1,329
Sun 26/1016:55SEA - SYD
1 stop32h 50mHawaiian Airlines
Thu 30/1021:40SYD - SEA
1 stop19h 16mHawaiian Airlines
Deal found 14/10$1,341
Tue 21/1014:00SEA - SYD
1 stop35h 45mHawaiian Airlines
Fri 31/1021:40SYD - SEA
1 stop19h 16mHawaiian Airlines
Deal found 14/10$1,355
Wed 12/1107:00SEA - SYD
1 stop17h 45mHawaiian Airlines
Thu 20/1121:40SYD - SEA
1 stop18h 57mHawaiian Airlines
Deal found 12/10$1,356
Thu 27/1117:55SEA - SYD
1 stop30h 50mHawaiian Airlines
Thu 4/1221:40SYD - SEA
1 stop18h 07mHawaiian Airlines
Deal found 13/10$1,361
Fri 31/1018:30SEA - SYD
1 stop31h 15mHawaiian Airlines
Sat 8/1121:40SYD - SEA
1 stop20h 41mHawaiian Airlines
Deal found 13/10$1,375
Wed 15/1007:44SEA - SYD
1 stop18h 01mHawaiian Airlines
Sat 8/1121:40SYD - SEA
1 stop17h 29mHawaiian Airlines
Deal found 13/10$1,380
Wed 22/1007:44SEA - SYD
1 stop18h 01mHawaiian Airlines
Fri 31/1021:40SYD - SEA
1 stop37h 06mHawaiian Airlines
Deal found 14/10$1,386
Wed 29/1007:00SEA - SYD
1 stop18h 45mAlaska Airlines
Tue 11/1121:40SYD - SEA
2 stops28h 31mAlaska Airlines
Deal found 13/10$1,387

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 October 2025.

Round-trip from

$1,278

One-way from

$460

Popular in

December

Cheapest in

September

Average price

$1,498
Philippine Airlines
  • Philippine Airlines
  • 10/4-15/4
  • 2 total stops
  • 65h 50m total
  • Seattle to Sydney
Search Deals
ANA
  • ANA
  • 9/12
  • 1 total stop
  • 33h 35m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($324 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($57 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
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 15 October 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 25/2

07:20-19:45

1 stop17h 25m

Sydney Kingsford Smith

Sun 8/3

21:40-05:15

1 stop25h 35m

$1,387

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 9/11

15:55-19:45

1 stop32h 50m

Sydney Kingsford Smith

Thu 13/11

21:40-05:35

1 stop26h 55m

$1,413

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 10/2

15:40-19:45

1 stop33h 05m

Sydney Kingsford Smith

Tue 10/3

21:40-22:40

1 stop19h 00m

$1,413

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 10/2

15:40-19:45

1 stop33h 05m

Sydney Kingsford Smith

Tue 10/3

21:40-07:15

2 stops27h 35m

$1,413

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 13/3

17:00-19:45

1 stop32h 45m

Sydney Kingsford Smith

Sun 22/3

21:40-06:25

1 stop26h 45m

$1,413

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 6/2

21:30-09:50

1 stop41h 20m

Sydney Kingsford Smith

Wed 25/2

11:35-18:40

1 stop26h 05m

$1,583

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 3/11

07:00-19:45

1 stop17h 45m

Sydney Kingsford Smith

Thu 6/11

21:40-20:09

1 stop17h 29m

$1,773

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 27/10

07:00-19:45

1 stop18h 45m

Sydney Kingsford Smith

Sun 2/11

21:40-23:21

1 stop20h 41m

$1,773

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 3/11

07:00-19:45

1 stop17h 45m

Sydney Kingsford Smith

Tue 18/11

21:40-05:35

1 stop26h 55m

$1,788

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 28/10

16:55-19:45

1 stop32h 50m

Sydney Kingsford Smith

Sun 9/11

21:40-20:09

1 stop17h 29m

$1,815

Flights are sorted by cheapest return flights first.

Deals found on 13/10

Showing 1-10 of 23 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 10 October 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 2 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 $895). Flying from Seattle to Sydney in January is currently the most expensive (average of $1,332). 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 October 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Sydney in the afternoon. If you’re flexible enough to do this you can expect to save up to 26% on your trip compared to booking a flight at midday.

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 October 2025.
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
8,976 reviews
Check prices

Comfort

7.3

Boarding

7.7

Crew

8.1

Overall

7.4

Entertainment

7.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Tim,Sept 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
United Airlines
7.4
Good
8,976 reviews
United Airlines
7.4
Good
8,976 reviews
Check prices

Comfort

7.3

Boarding

7.7

Crew

8.1

Overall

7.4

Entertainment

7.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Tim,Sept 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
Air Canada
7.1
Good
10,297 reviews
United Airlines
7.4
Good
8,976 reviews
Check prices

Comfort

7.3

Boarding

7.7

Crew

8.1

Overall

7.4

Entertainment

7.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Tim,Sept 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.

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 and Hawaiian Airlines can get you from Seattle to Sydney in just under 17h 25m. Your travel time can differ by up to 15h 25m. 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 $1,233. Another option worth looking into is Air Canada, starting at $1,297 round trip. Users have found that United Airlines is 25% 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 ($628), Hawaiian Airlines ($816), and Alaska Airlines ($816).

  • 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 $895). Flying from Seattle to Sydney in January is currently the most expensive (average of $1,332). 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
Katoomba
Penrith
Manly
Terrigal
Randwick
Coogee
Cronulla
Leura
Lithgow
Bondi Beach

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
Spokane to Sydney flights
Portland to Coolangatta flights
Seattle 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 October 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,233Average$1,930FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest$1,297Average$1,776FlexibilityNo 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.