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Cheap flights from Seattle to Australia from $432

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 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
20 Nov — 27 Nov1
1 adult
1 adult, Economy

Cheap flight deals from Seattle to Australia

Keep the following information in mind while searching for Seattle to Australia flight deals. Data was last updated 21 October 2025.

Round-trip from

$1,303

One-way from

$432

Popular in

December

Cheapest in

September

Average price

$1,492
Philippine Airlines
  • Philippine Airlines
  • 20/2-10/3
  • 2 total stops
  • 67h 25m total
  • Seattle to Australia
Search Deals
ANA
  • ANA
  • 2/3
  • 1 total stop
  • 33h 30m total
  • Seattle to Australia
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($353 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($61 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find flight deals from Seattle to Australia

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Australia
Explore the most affordable flight options available from Seattle to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 October 2025.

Fri 31/1007:00SEA - SYD
1 stop18h 45mHawaiian Airlines
Sat 8/1121:40SYD - SEA
1 stop17h 29mHawaiian Airlines
Deal found 19/10$1,326
Sat 25/1007:44SEA - SYD
1 stop18h 01mHawaiian Airlines
Fri 7/1121:40SYD - SEA
1 stop17h 29mHawaiian Airlines
Deal found 20/10$1,336
Sat 15/1107:00SEA - SYD
1 stop17h 45mHawaiian Airlines
Sat 13/1221:40SYD - SEA
1 stop21h 06mHawaiian Airlines
Deal found 19/10$1,360
Thu 30/1007:00SEA - SYD
1 stop18h 45mAlaska Airlines
Fri 7/1121:40SYD - SEA
1 stop20h 41mAlaska Airlines
Deal found 19/10$1,366
Fri 24/1007:44SEA - SYD
1 stop18h 01mHawaiian Airlines
Sun 26/1021:40SYD - SEA
1 stop19h 16mHawaiian Airlines
Deal found 21/10$1,373
Mon 10/1107:00SEA - SYD
1 stop17h 45mAlaska Airlines
Fri 21/1121:40SYD - SEA
1 stop18h 09mAlaska Airlines
Deal found 19/10$1,380
Fri 24/1014:00SEA - SYD
1 stop35h 45mAlaska Airlines
Thu 6/1121:40SYD - SEA
1 stop26h 55mAlaska Airlines
Deal found 20/10$1,386
Tue 21/1020:45SEA - SYD
1 stop29h 00mAlaska Airlines
Tue 28/1021:40SYD - SEA
2 stops19h 56mAlaska Airlines
Deal found 20/10$1,393
Tue 11/1105:50SEA - BNE
1 stop32h 55mAir Canada
Tue 2/1210:45BNE - SEA
1 stop21h 46mAir Canada
Deal found 20/10$1,402
Wed 12/1111:23SEA - BNE
1 stop23h 37mMultiple Airlines
Wed 26/1119:40BNE - SEA
1 stop18h 43mMultiple Airlines
Deal found 19/10$1,405
Sun 9/1118:30SEA - SYD
1 stop30h 15mHawaiian Airlines
Thu 13/1121:40SYD - SEA
1 stop20h 41mHawaiian Airlines
Deal found 21/10$1,406
Wed 19/1110:05SEA - BNE
1 stop28h 40mAir Canada
Wed 26/1110:45BNE - SEA
1 stop21h 46mAir Canada
Deal found 21/10$1,417

Cheapflights Fare Finder

 
Customise your flight search to find flights from Seattle to Australia 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 21 October 2025.
Use the filters below to find and compare flights from Seattle to Australia that are best for you.

Fly from

Seattle

Fly to

Australia

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 1/4

08:05-19:45

1 stop17h 40m

Sydney Kingsford Smith

Tue 21/4

21:40-22:58

1 stop18h 18m

$1,369

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 10/11

07:00-19:45

1 stop17h 45m

Sydney Kingsford Smith

Fri 21/11

21:40-05:00

2 stops26h 20m

$1,380

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 20/2

15:35-05:00

1 stop19h 25m

Brisbane

Sun 1/3

17:10-18:51

1 stop19h 41m

$1,405

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Wed 12/11

11:23-05:00

1 stop23h 37m

Brisbane

Wed 26/11

19:40-20:23

1 stop18h 43m

$1,405

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 9/11

08:00-19:45

1 stop40h 45m

Sydney Kingsford Smith

Thu 13/11

21:40-23:21

1 stop20h 41m

$1,406

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 10/2

17:45-19:45

1 stop31h 00m

Sydney Kingsford Smith

Tue 10/3

21:40-22:40

1 stop19h 00m

$1,406

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 5/11

12:45-19:45

1 stop36h 00m

Sydney Kingsford Smith

Sun 16/11

21:40-05:35

1 stop26h 55m

$1,406

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 20/2

07:20-19:45

1 stop17h 25m

Sydney Kingsford Smith

Fri 13/3

21:40-18:55

2 stops39h 15m

$1,557

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 26/3

08:05-19:45

1 stop17h 40m

Sydney Kingsford Smith

Fri 17/4

21:40-06:35

1 stop25h 55m

$1,582

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 3/11

07:00-19:45

1 stop17h 45m

Sydney Kingsford Smith

Thu 6/11

21:40-23:36

2 stops20h 56m

$1,582

Flights are sorted by cheapest return flights first.

Deals found on 19/10

Showing 1-10 of 60 results
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Best time to book a flight from Seattle to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia 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 Australia

What is the cheapest month to book a flight from Seattle to Australia?

Currently, July is the cheapest month in which you can book a flight from Seattle to Australia (average of $891). Flying from Seattle to Australia in January is currently the most expensive (average of $1,294). 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 AU?

Find hourly flight availability from Seattle to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 21 October 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 12% on flights from Seattle to Australia by exploring options for tickets in the evening.

Reviews of airlines servicing Australia

Get insights into the airlines that provide service to Australia. 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 Australia. Reviews last updated 21 October 2025.
Read reviews from past customers who have flown with United Airlines and Air Canada from Seattle to Australia. 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.
United Airlines
7.4
Good
8,991 reviews
Check prices

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

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
8,991 reviews
United Airlines
7.4
Good
8,991 reviews
Check prices

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

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
10,335 reviews
United Airlines
7.4
Good
8,991 reviews
Check prices

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

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 Australia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Australia?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Australia. Seattle/Tacoma Intl is conveniently located just 18.4 km from Seattle’s city centre.

  • How long is the flight from Seattle to Australia?

    Alaska Airlines, Hawaiian Airlines, and Delta can get you from Seattle to Australia in just under 17h 40m. Your travel time can differ by up to 23h 05m. There are 12463 km between Seattle and Australia. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines to fly from Seattle to Australia one-way?

    To fly one-way, consider booking your trip with ANA, which is currently one of the cheapest options available, starting at $450. Philippine Airlines flights start at $745 while deals on Alaska Airlines start at $778 one-way.

  • What are the most popular routes from Seattle to Australia?

    Most travellers choose Seattle/Tacoma Intl - Sydney Kingsford Smith, Seattle/Tacoma Intl - Melbourne or Seattle/Tacoma Intl - Brisbane when deciding on the best route from Seattle to Australia.

  • Can I find deals for flights from Seattle to Australia that include hotel bookings?

    Yes. In addition to deals on Seattle to Australia flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Australia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Australia.

  • Can I find deals for business class flights from Seattle to Australia?

    Yes. Cheapflights offers flight deals from Seattle to Australia 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 Australia?

    Currently, July is the cheapest month in which you can book a flight from Seattle to Australia (average of $891). Flying from Seattle to Australia in January is currently the most expensive (average of $1,294). 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

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Seattle to Australia

Discover the top 2 airlines that operate flights from Seattle to Australia. 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 21 October 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,228Average$1,987FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest$1,292Average$1,857FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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How does Cheapflights help users find flights from Seattle to Australia?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Seattle to Australia. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Australia?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Seattle to Australia.

Can Cheapflights find flights from Seattle to Australia with no change fees?

Certainly. Search results for flights to Australia from Seattle shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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