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Cheap flights from Seattle to Sydney from $404

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Sydney departing on 3/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to Sydney

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:18 am - 7:25 am
SEA
-
SYD
27h 07m
1 stop
Multiple Airlines Logo
2:00 pm - 10:54 am
SYD
-
SEA
39h 54m
2 stops
$905Multiple Airlines
Fri, Feb 20 - Sun, Mar 1
Multiple Airlines Logo
9:28 am - 9:10 am
SEA
-
SYD
52h 42m
2 stops
Multiple Airlines Logo
11:20 am - 5:09 pm
SYD
-
SEA
23h 49m
1 stop
$920Multiple Airlines
Mon, Mar 2 - Mon, Mar 9
Multiple Airlines Logo
11:32 am - 7:25 am
SEA
-
SYD
24h 53m
1 stop
Multiple Airlines Logo
2:00 pm - 8:47 am
SYD
-
SEA
37h 47m
2 stops
$931Multiple Airlines
Sat, Feb 21 - Sun, Mar 1
Qantas Airways Logo
6:00 am - 9:00 am
SEA
-
SYD
32h 00m
1 stop
Qantas Airways Logo
7:15 pm - 6:57 pm
SYD
-
SEA
42h 42m
2 stops
$934Qantas Airways
Sat, Feb 7 - Tue, Feb 24
ANA Logo
4:30 pm - 7:15 pm
SEA
-
SYD
33h 45m
1 stop
ANA Logo
8:55 pm - 2:25 pm
SYD
-
SEA
34h 30m
1 stop
$950ANA
Sun, May 3 - Tue, May 12
Multiple Airlines Logo
4:50 pm - 12:35 pm
SEA
-
SYD
24h 45m
2 stops
Multiple Airlines Logo
2:00 pm - 11:43 pm
SYD
-
SEA
28h 43m
2 stops
$956Multiple Airlines
Sat, Feb 21 - Sun, Mar 1
ANA Logo
4:30 pm - 7:15 pm
SEA
-
SYD
33h 45m
1 stop
ANA Logo
11:50 am - 9:06 pm
SYD
-
SEA
26h 16m
2 stops
$960ANA
Sun, May 3 - Tue, May 12
Qantas Airways Logo
4:50 pm - 9:00 am
SEA
-
SYD
21h 10m
1 stop
Qantas Airways Logo
7:15 pm - 1:59 pm
SYD
-
SEA
37h 44m
2 stops
$961Qantas Airways
Sat, Feb 14 - Mon, Mar 2
Multiple Airlines Logo
10:42 am - 7:30 am
SEA
-
SYD
27h 48m
1 stop
Multiple Airlines Logo
1:15 pm - 8:29 am
SYD
-
SEA
36h 14m
2 stops
$974Multiple Airlines
Sat, Apr 18 - Fri, May 8
Multiple Airlines Logo
9:28 am - 7:25 am
SEA
-
SYD
26h 57m
1 stop
Multiple Airlines Logo
2:00 pm - 8:47 am
SYD
-
SEA
36h 47m
2 stops
$977Multiple Airlines
Thu, Mar 5 - Sun, Mar 15

ANA flights from Seattle to Sydney

Our best ANA deals on Seattle to Sydney flight tickets
ANA
May 11
SEA4:30 pmSeattle/Tacoma Intl
33h 45m
1 stop
SYD7:15 pmSydney Kingsford Smith
May 18
SYD8:55 pmSydney Kingsford Smith
34h 30m
1 stop
SEA2:25 pmSeattle/Tacoma Intl
$919
ANA
May 11
SEA4:30 pmSeattle/Tacoma Intl
33h 45m
1 stop
SYD7:15 pmSydney Kingsford Smith
May 27
SYD11:50 amSydney Kingsford Smith
25h 58m
2 stops
SEA8:48 pmSeattle/Tacoma Intl
$949
ANA
May 10
SEA4:30 pmSeattle/Tacoma Intl
33h 45m
1 stop
SYD7:15 pmSydney Kingsford Smith
May 26
SYD8:55 pmSydney Kingsford Smith
34h 30m
1 stop
SEA2:25 pmSeattle/Tacoma Intl
$951

American Airlines flights from Seattle to Sydney

Our best American Airlines deals on Seattle to Sydney flight tickets
American Airlines
Feb 16
SEA11:45 amSeattle/Tacoma Intl
24h 10m
1 stop
SYD6:55 amSydney Kingsford Smith
Feb 23
SYD2:05 pmSydney Kingsford Smith
24h 24m
1 stop
SEA7:29 pmSeattle/Tacoma Intl
$1,165
American Airlines
Feb 16
SEA3:00 pmSeattle/Tacoma Intl
23h 00m
2 stops
SYD9:00 amSydney Kingsford Smith
Feb 23
SYD2:05 pmSydney Kingsford Smith
24h 24m
1 stop
SEA7:29 pmSeattle/Tacoma Intl
$1,168

momondo Fare Finder

 
Customize 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, momondo users made 832,500 searches. Data last updated February 3, 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

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 2/20

9:18 am-7:25 am

1 stop27h 07m

Sydney Kingsford Smith

Sun 3/1

2:00 pm-10:54 am

2 stops39h 54m

$905

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 3/2

9:28 am-9:10 am

2 stops52h 42m

Sydney Kingsford Smith

Mon 3/9

11:20 am-5:09 pm

1 stop23h 49m

$920

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/21

11:32 am-7:25 am

1 stop24h 53m

Sydney Kingsford Smith

Sun 3/1

2:00 pm-8:47 am

2 stops37h 47m

$931

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/7

6:00 am-9:00 am

1 stop32h 00m

Sydney Kingsford Smith

Tue 2/24

7:15 pm-6:57 pm

2 stops42h 42m

$934

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/3

4:30 pm-7:15 pm

1 stop33h 45m

Sydney Kingsford Smith

Tue 5/12

8:55 pm-2:25 pm

1 stop34h 30m

$950

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/21

4:50 pm-12:35 pm

2 stops24h 45m

Sydney Kingsford Smith

Sun 3/1

2:00 pm-11:43 pm

2 stops28h 43m

$956

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/3

4:30 pm-7:15 pm

1 stop33h 45m

Sydney Kingsford Smith

Tue 5/12

11:50 am-9:06 pm

2 stops26h 16m

$960

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/14

4:50 pm-9:00 am

1 stop21h 10m

Sydney Kingsford Smith

Mon 3/2

7:15 pm-1:59 pm

2 stops37h 44m

$961

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 4/18

10:42 am-7:30 am

1 stop27h 48m

Sydney Kingsford Smith

Fri 5/8

1:15 pm-8:29 am

2 stops36h 14m

$974

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 3/5

9:28 am-7:25 am

1 stop26h 57m

Sydney Kingsford Smith

Sun 3/15

2:00 pm-8:47 am

2 stops36h 47m

$977

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Seattle to Sydney

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Sydney?

In general, August is the cheapest month to fly from Seattle to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $846. If you are unable to visit Sydney during the month of August, then departing from Seattle during the month September is also very affordable. Most momondo users find prices during this month for around $860.

How far in advance should I book a flight to Sydney?

You are more likely to see cheaper flights to Sydney from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,056 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Seattle for as low as $876 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of February 2026, prices for Seattle to Sydney flights are approximately 29% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to Sydney

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Sydney according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Sydney (SEA to SYD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Sydney

Fastest flight time

17h 45m

Direct flights

None
The fastest flight from Seattle to Sydney takes 17h 45m
There are no direct flights from Seattle to Sydney. There are no popular flight routes from Seattle to Sydney.
Search flight deals

  • How far is Seattle/Tacoma Intl to Sydney Kingsford Smith by plane?

    Sydney Kingsford Smith is 7743.7 mi away from Seattle/Tacoma Intl. In terms of flight time, this usually takes a little over 17h 45m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport are updated daily.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport.

  • What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

    The required travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Sydney Kingsford Smith Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from Seattle to Sydney?

Best airlines flying from Seattle to Sydney

Compare and see reviews for airlines that fly from Seattle to Sydney with momondo
Airline
Rating
Free Cancellation
Price
ANAPriceFrom $583Free CancellationRating
8.4
1,082 reviews
Search ANA flights
Alaska AirlinesPriceFrom $591Free CancellationRating
8.0
11,832 reviews
Search Alaska Airlines flights
Philippine AirlinesPriceFrom $758Free CancellationRating
7.3
955 reviews
Search Philippine Airlines flights
Air CanadaPriceFrom $779Free CancellationRating
7.1
10,680 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $789Free CancellationRating
7.5
985 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $804Free CancellationRating
7.2
11,215 reviews
Search American Airlines flights
Hawaiian AirlinesPriceFrom $812Free CancellationRating
7.8
2,830 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $830Free CancellationRating
7.4
9,232 reviews
Search United Airlines flights
DeltaPriceFrom $842Free CancellationRating
7.9
8,136 reviews
Search Delta flights

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Bondi Beach
Parramatta
Katoomba
Wollongong
Randwick
Penrith
Coogee
Manly
Lithgow
Leura
Cronulla
Charlestown
Terrigal
Swansea

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Sydney?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Seattle to Sydney. momondo saves you time and could save you money on your trip.

Can I find flights from Seattle to Sydney with flexible booking policies on momondo?

Yes. All flights to Sydney from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Seattle to Sydney?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Sydney from Seattle.

I’m not ready to book a flight from Seattle to Sydney right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Seattle to Sydney flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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