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Cheap flights from Seattle to Sydney from $603

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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
7 maj — 14 maj1
1 adult
1 adult, Economy, 0 bags

Cheap 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 7 april 2026.

sön 26/405:30
SEA
-
SYD
1 stop32h 35m
American Airlines
sön 10/517:50
SYD
-
SEA
1 stop22h 08m
American Airlines
Deal found 3/4$1,387
tis 28/714:20
SEA
-
SYD
1 stop24h 10m
American Airlines
tis 11/809:10
SYD
-
SEA
1 stop24h 09m
American Airlines
Deal found 6/4$1,404
sön 2/814:20
SEA
-
SYD
1 stop24h 10m
American Airlines
ons 19/812:00
SYD
-
SEA
1 stop23h 49m
American Airlines
Deal found 3/4$1,406
tis 5/517:59
SEA
-
SYD
1 stop19h 51m
Delta
ons 3/609:15
SYD
-
SEA
1 stop18h 40m
Delta
Deal found 6/4$1,410
tis 28/710:50
SEA
-
SYD
2 stops27h 00m
Delta
tis 11/809:15
SYD
-
SEA
2 stops24h 37m
Delta
Deal found 7/4$1,416
tis 19/505:30
SEA
-
SYD
2 stops32h 20m
Delta
ons 10/609:15
SYD
-
SEA
1 stop20h 14m
Delta
Deal found 3/4$1,417
tors 12/1123:55
SEA
-
SYD
1 stop38h 50m
Philippine Airlines
mån 16/1111:35
SYD
-
SEA
1 stop26h 00m
Philippine Airlines
Deal found 6/4$1,423
lör 2/517:55
SEA
-
SYD
2 stops43h 55m
Delta
ons 3/609:15
SYD
-
SEA
1 stop20h 06m
Delta
Deal found 2/4$1,434
mån 1/615:20
SEA
-
SYD
2 stops22h 45m
American Airlines
mån 29/617:30
SYD
-
SEA
2 stops21h 19m
American Airlines
Deal found 7/4$1,440

Find 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 7 april 2026.

Round-trip from

$1,387

One-way from

$603

Popular in

December

Cheapest in

August

Average price

$1,495
American Airlines
  • American Airlines
  • 26/4-10/5
  • 3 total stops
  • 51h 00m total
  • Seattle to Sydney
Search Deals
12/5
  • 12/5
  • 2 total stops
  • 31h 44m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($438 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($101 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
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 7 april 2026.
Use the filters below to find and compare flights from Seattle to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

sön 3/5

05:35-06:50

2 stops32h 15m

Sydney Kingsford Smith

tis 2/6

09:15-12:21

1 stop20h 06m

$1,416

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

ons 29/4

13:30-06:50

2 stops24h 20m

Sydney Kingsford Smith

tis 12/5

09:15-18:48

2 stops26h 33m

$1,416

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

tis 5/5

05:35-06:50

2 stops32h 15m

Sydney Kingsford Smith

ons 3/6

09:15-10:55

1 stop18h 40m

$1,416

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

mån 4/5

09:50-06:50

2 stops28h 00m

Sydney Kingsford Smith

tis 2/6

09:15-10:55

1 stop18h 40m

$1,416

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

tis 19/5

05:30-06:50

2 stops32h 20m

Sydney Kingsford Smith

ons 10/6

09:15-18:40

2 stops26h 25m

$1,417

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

lör 2/5

13:45-06:50

1 stop24h 05m

Sydney Kingsford Smith

fre 22/5

09:15-10:55

1 stop18h 40m

$1,504

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

lör 1/8

05:25-06:50

2 stops32h 25m

Sydney Kingsford Smith

fre 14/8

09:15-14:45

2 stops22h 30m

$1,511

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

sön 2/8

08:57-07:00

2 stops29h 03m

Sydney Kingsford Smith

ons 19/8

09:30-15:51

2 stops23h 21m

$1,760
Fastest return journey

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

sön 19/4

16:32-07:00

1 stop21h 28m

Sydney Kingsford Smith

tors 14/5

09:30-11:37

1 stop19h 07m

$1,826

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

sön 14/6

21:09-18:50

1 stop28h 41m

Sydney Kingsford Smith

fre 26/6

20:45-08:47

2 stops29h 02m

$1,989

Flights are sorted by cheapest return flights first.

Deals found on 6/4

Showing 1-10 of 24 resultsSorted by cheapest first
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2
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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 3 April 2026.

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 24 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, February is the cheapest month in which you can book a flight from Seattle to Sydney (average of $831). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,217). 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.

How much does it cost for a return flight from Seattle to Sydney?

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 7 april 2026.
Get a feel of what it's like to fly with United Airlines 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
9,548 reviews
Check prices

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,548 reviews
United Airlines
7.4
Good
9,548 reviews
Check prices

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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?

    Delta can get you from Seattle to Sydney in just under 32h 15m. Your travel time can differ by up to . Airlines will cover a distance of 12463 km.

  • What is the cheapest airline to fly from Seattle to Sydney round-trip?

    Flying on United Airlines is currently your cheapest option to Sydney, with prices starting at $1,150. Users have found that United Airlines is 24% 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 ANA ($529), Qantas Airways ($532), and United Airlines ($578).

  • 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, February is the cheapest month in which you can book a flight from Seattle to Sydney (average of $831). Flying from Seattle to Sydney in December is currently the most expensive (average of $1,217). 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
Penrith
Terrigal
Katoomba
Lithgow
Cronulla
Manly
Bondi Beach
Coogee
Leura
Randwick

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
Spokane to Sydney flights
Seattle to Coolangatta flights
Portland to Coolangatta flights

Top airline flying from Seattle to Sydney

Discover the top airline 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 7 april 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,150Average$2,193FlexibilityNo cancel feeOn-time69%
Search United Airlines 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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