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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.
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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.
ANA Logo
4:30 pm - 7:15 pm
SEA
-
SYD
33h 45m
1 stop
ANA Logo
11:50 am - 6:30 pm
SYD
-
SEA
23h 40m
2 stops
$1,047ANA
Thu, May 21 - Tue, Jun 2
ANA Logo
9:55 am - 7:15 pm
SEA
-
SYD
40h 20m
2 stops
ANA Logo
8:55 pm - 8:48 pm
SYD
-
SEA
40h 53m
2 stops
$1,049ANA
Tue, May 19 - Mon, Jun 1
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
$1,055ANA
Thu, May 21 - Tue, Jun 2
ANA Logo
4:30 pm - 7:15 pm
SEA
-
SYD
33h 45m
1 stop
ANA Logo
8:55 pm - 8:48 pm
SYD
-
SEA
40h 53m
2 stops
$1,057ANA
Mon, May 25 - Mon, Jun 1
Multiple Airlines Logo
3:50 pm - 7:25 am
SEA
-
SYD
21h 35m
1 stop
Multiple Airlines Logo
2:00 pm - 8:42 pm
SYD
-
SEA
24h 42m
2 stops
$1,058Multiple Airlines
Thu, Mar 12 - Wed, Mar 25
Multiple Airlines Logo
10:42 am - 7:30 am
SEA
-
SYD
27h 48m
1 stop
Multiple Airlines Logo
1:15 pm - 6:55 pm
SYD
-
SEA
22h 40m
2 stops
$1,059Multiple Airlines
Tue, May 19 - Sat, May 30
Multiple Airlines Logo
9:18 am - 7:25 am
SEA
-
SYD
27h 07m
1 stop
Multiple Airlines Logo
2:00 pm - 11:43 pm
SYD
-
SEA
28h 43m
2 stops
$1,061Multiple Airlines
Mon, Feb 23 - Sat, Mar 7
Multiple Airlines Logo
12:50 pm - 7:25 am
SEA
-
SYD
23h 35m
1 stop
Multiple Airlines Logo
2:00 pm - 5:00 pm
SYD
-
SEA
22h 00m
2 stops
$1,062Multiple Airlines
Wed, Feb 25 - Tue, Mar 3
Multiple Airlines Logo
10:42 am - 7:30 am
SEA
-
SYD
27h 48m
1 stop
Multiple Airlines Logo
1:10 pm - 7:46 pm
SYD
-
SEA
23h 36m
2 stops
$1,064Multiple Airlines
Sat, Apr 18 - Wed, May 6
Multiple Airlines Logo
9:28 am - 7:25 am
SEA
-
SYD
26h 57m
1 stop
Multiple Airlines Logo
2:00 pm - 6:40 pm
SYD
-
SEA
23h 40m
2 stops
$1,065Multiple Airlines
Fri, Feb 27 - Wed, Mar 4

ANA flights from Seattle to Sydney

Our best ANA deals on Seattle to Sydney flight tickets
ANA
May 21
SEA4:30 pmSeattle/Tacoma Intl
33h 45m
1 stop
SYD7:15 pmSydney Kingsford Smith
Jun 2
SYD11:50 amSydney Kingsford Smith
23h 40m
2 stops
SEA6:30 pmSeattle/Tacoma Intl
$1,047
ANA
May 19
SEA9:55 amSeattle/Tacoma Intl
40h 20m
2 stops
SYD7:15 pmSydney Kingsford Smith
Jun 1
SYD8:55 pmSydney Kingsford Smith
40h 53m
2 stops
SEA8:48 pmSeattle/Tacoma Intl
$1,049
ANA
May 21
SEA4:30 pmSeattle/Tacoma Intl
33h 45m
1 stop
SYD7:15 pmSydney Kingsford Smith
Jun 2
SYD8:55 pmSydney Kingsford Smith
34h 30m
1 stop
SEA2:25 pmSeattle/Tacoma Intl
$1,055

American Airlines flights from Seattle to Sydney

Our best American Airlines deals on Seattle to Sydney flight tickets
American Airlines
Feb 1
SEA10:50 amSeattle/Tacoma Intl
25h 05m
1 stop
SYD6:55 amSydney Kingsford Smith
Feb 9
SYD11:20 amSydney Kingsford Smith
25h 45m
1 stop
SEA6:05 pmSeattle/Tacoma Intl
$1,160
American Airlines
Feb 1
SEA2:29 pmSeattle/Tacoma Intl
23h 31m
2 stops
SYD9:00 amSydney Kingsford Smith
Feb 9
SYD11:20 amSydney Kingsford Smith
25h 45m
1 stop
SEA6:05 pmSeattle/Tacoma Intl
$1,164
American Airlines
Feb 8
SEA2:29 pmSeattle/Tacoma Intl
23h 31m
2 stops
SYD9:00 amSydney Kingsford Smith
Feb 22
SYD5:45 pmSydney Kingsford Smith
20h 13m
1 stop
SEA6:58 pmSeattle/Tacoma Intl
$1,166

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 January 28, 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

Thu 5/21

4:30 pm-7:15 pm

1 stop33h 45m

Sydney Kingsford Smith

Tue 6/2

11:50 am-6:30 pm

2 stops23h 40m

$1,047

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/19

9:55 am-7:15 pm

2 stops40h 20m

Sydney Kingsford Smith

Mon 6/1

8:55 pm-8:48 pm

2 stops40h 53m

$1,049

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 5/21

4:30 pm-7:15 pm

1 stop33h 45m

Sydney Kingsford Smith

Tue 6/2

8:55 pm-2:25 pm

1 stop34h 30m

$1,055

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/25

4:30 pm-7:15 pm

1 stop33h 45m

Sydney Kingsford Smith

Mon 6/1

8:55 pm-8:48 pm

2 stops40h 53m

$1,057

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 3/12

3:50 pm-7:25 am

1 stop21h 35m

Sydney Kingsford Smith

Wed 3/25

2:00 pm-8:42 pm

2 stops24h 42m

$1,058

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/19

10:42 am-7:30 am

1 stop27h 48m

Sydney Kingsford Smith

Sat 5/30

1:15 pm-6:55 pm

2 stops22h 40m

$1,059

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 2/23

9:18 am-7:25 am

1 stop27h 07m

Sydney Kingsford Smith

Sat 3/7

2:00 pm-11:43 pm

2 stops28h 43m

$1,061

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 2/25

12:50 pm-7:25 am

1 stop23h 35m

Sydney Kingsford Smith

Tue 3/3

2:00 pm-5:00 pm

2 stops22h 00m

$1,062

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 4/18

10:42 am-7:30 am

1 stop27h 48m

Sydney Kingsford Smith

Wed 5/6

1:10 pm-7:46 pm

2 stops23h 36m

$1,064

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 2/27

9:28 am-7:25 am

1 stop26h 57m

Sydney Kingsford Smith

Wed 3/4

2:00 pm-6:40 pm

2 stops23h 40m

$1,065

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Sydney from

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 $1,055 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 January 2026, prices for Seattle to Sydney flights are approximately 33% 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
1,078 reviews
Search ANA flights
Alaska AirlinesPriceFrom $591Free CancellationRating
8.0
11,805 reviews
Search Alaska Airlines flights
Philippine AirlinesPriceFrom $758Free CancellationRating
7.3
957 reviews
Search Philippine Airlines flights
Air CanadaPriceFrom $779Free CancellationRating
7.1
10,666 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $789Free CancellationRating
7.5
980 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $804Free CancellationRating
7.2
11,199 reviews
Search American Airlines flights
Hawaiian AirlinesPriceFrom $812Free CancellationRating
7.8
2,830 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $830Free CancellationRating
7.4
9,213 reviews
Search United Airlines flights
DeltaPriceFrom $842Free CancellationRating
7.9
8,124 reviews
Search Delta flights

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Bondi Beach
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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