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Cheap flights from Seattle to Sydney from $448

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 2/10. 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.
Multiple Airlines Logo
3:52 pm - 12:35 pm
SEA
-
SYD
25h 43m
2 stops
Multiple Airlines Logo
2:00 pm - 5:00 pm
SYD
-
SEA
22h 00m
2 stops
$1,017Multiple Airlines
Wed, Feb 18 - Wed, Feb 25
ANA Logo
6:58 pm - 7:15 pm
SEA
-
SYD
31h 17m
2 stops
ANA Logo
8:55 pm - 8:48 pm
SYD
-
SEA
40h 53m
2 stops
$1,018ANA
Wed, May 6 - Wed, May 27
Multiple Airlines Logo
4:50 pm - 12:35 pm
SEA
-
SYD
24h 45m
2 stops
Multiple Airlines Logo
2:00 pm - 6:40 pm
SYD
-
SEA
23h 40m
2 stops
$1,022Multiple Airlines
Tue, Feb 17 - Wed, Mar 4
ANA Logo
4:30 pm - 7:15 pm
SEA
-
SYD
33h 45m
1 stop
ANA Logo
11:50 am - 2:18 pm
SYD
-
SEA
43h 28m
2 stops
$1,023ANA
Sun, May 17 - Fri, May 22
Multiple Airlines Logo
11:25 am - 7:30 am
SEA
-
SYD
27h 05m
1 stop
Multiple Airlines Logo
1:15 pm - 6:40 pm
SYD
-
SEA
22h 25m
2 stops
$1,025Multiple Airlines
Tue, Apr 21 - Tue, May 5
Multiple Airlines Logo
3:50 pm - 12:35 pm
SEA
-
SYD
25h 45m
2 stops
Multiple Airlines Logo
2:00 pm - 5:00 pm
SYD
-
SEA
22h 00m
2 stops
$1,027Multiple Airlines
Tue, Feb 17 - Tue, Feb 24
Multiple Airlines Logo
9:24 pm - 11:45 am
SEA
-
SYD
45h 21m
2 stops
Multiple Airlines Logo
1:15 pm - 6:56 pm
SYD
-
SEA
22h 41m
2 stops
$1,035Multiple Airlines
Thu, Apr 30 - Tue, May 19
Multiple Airlines Logo
9:18 am - 7:25 am
SEA
-
SYD
27h 07m
1 stop
Multiple Airlines Logo
2:00 pm - 5:09 pm
SYD
-
SEA
22h 09m
2 stops
$1,036Multiple Airlines
Fri, Feb 20 - Fri, Mar 6
Multiple Airlines Logo
9:28 am - 7:25 am
SEA
-
SYD
26h 57m
1 stop
Multiple Airlines Logo
2:00 pm - 10:42 pm
SYD
-
SEA
26h 42m
2 stops
$1,041Multiple Airlines
Thu, Feb 19 - Tue, Mar 24
Multiple Airlines Logo
12:01 pm - 7:25 am
SEA
-
SYD
24h 24m
1 stop
Multiple Airlines Logo
2:00 pm - 7:28 am
SYD
-
SEA
36h 28m
2 stops
$1,042Multiple Airlines
Sun, Feb 8 - Sun, Mar 8

ANA flights from Seattle to Sydney

Our best ANA deals on Seattle to Sydney flight tickets
ANA
May 6
SEA6:58 pmSeattle/Tacoma Intl
31h 17m
2 stops
SYD7:15 pmSydney Kingsford Smith
May 27
SYD8:55 pmSydney Kingsford Smith
40h 53m
2 stops
SEA8:48 pmSeattle/Tacoma Intl
$1,018
ANA
May 17
SEA4:30 pmSeattle/Tacoma Intl
33h 45m
1 stop
SYD7:15 pmSydney Kingsford Smith
May 21
SYD8:55 pmSydney Kingsford Smith
58h 23m
2 stops
SEA2:18 pmSeattle/Tacoma Intl
$1,023
ANA
Jun 3
SEA4:30 pmSeattle/Tacoma Intl
33h 45m
1 stop
SYD7:15 pmSydney Kingsford Smith
Jun 25
SYD8:55 pmSydney Kingsford Smith
34h 30m
1 stop
SEA2:25 pmSeattle/Tacoma Intl
$1,060

Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets
Air Canada
Apr 19
SEA10:10 amSeattle/Tacoma Intl
28h 10m
1 stop
SYD7:20 amSydney Kingsford Smith
May 11
SYD9:20 amSydney Kingsford Smith
26h 10m
1 stop
SEA6:30 pmSeattle/Tacoma Intl
$1,043
Air Canada
Apr 22
SEA3:40 pmSeattle/Tacoma Intl
22h 40m
1 stop
SYD7:20 amSydney Kingsford Smith
Apr 29
SYD9:20 amSydney Kingsford Smith
26h 58m
1 stop
SEA7:18 pmSeattle/Tacoma Intl
$1,048
Air Canada
Feb 27
SEA8:00 pmSeattle/Tacoma Intl
18h 35m
1 stop
SYD9:35 amSydney Kingsford Smith
Mar 22
SYD10:20 amSydney Kingsford Smith
17h 11m
1 stop
SEA9:31 amSeattle/Tacoma Intl
$1,085

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 20, 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

Wed 2/18

3:52 pm-12:35 pm

2 stops25h 43m

Sydney Kingsford Smith

Wed 2/25

2:00 pm-5:00 pm

2 stops22h 00m

$1,017

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 5/6

6:58 pm-7:15 pm

2 stops31h 17m

Sydney Kingsford Smith

Wed 5/27

8:55 pm-8:48 pm

2 stops40h 53m

$1,018

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 2/17

4:50 pm-12:35 pm

2 stops24h 45m

Sydney Kingsford Smith

Wed 3/4

2:00 pm-6:40 pm

2 stops23h 40m

$1,022

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/17

4:30 pm-7:15 pm

1 stop33h 45m

Sydney Kingsford Smith

Fri 5/22

11:50 am-2:18 pm

2 stops43h 28m

$1,023

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/21

11:25 am-7:30 am

1 stop27h 05m

Sydney Kingsford Smith

Tue 5/5

1:15 pm-6:40 pm

2 stops22h 25m

$1,025

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 2/17

3:50 pm-12:35 pm

2 stops25h 45m

Sydney Kingsford Smith

Tue 2/24

2:00 pm-5:00 pm

2 stops22h 00m

$1,027

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 4/30

9:24 pm-11:45 am

2 stops45h 21m

Sydney Kingsford Smith

Tue 5/19

1:15 pm-6:56 pm

2 stops22h 41m

$1,035

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 2/20

9:18 am-7:25 am

1 stop27h 07m

Sydney Kingsford Smith

Fri 3/6

2:00 pm-5:09 pm

2 stops22h 09m

$1,036

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 2/19

9:28 am-7:25 am

1 stop26h 57m

Sydney Kingsford Smith

Tue 3/24

2:00 pm-10:42 pm

2 stops26h 42m

$1,041

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 2/8

12:01 pm-7:25 am

1 stop24h 24m

Sydney Kingsford Smith

Sun 3/8

2:00 pm-7:28 am

2 stops36h 28m

$1,042

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 $1,054 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
1,077 reviews
Search ANA flights
Alaska AirlinesPriceFrom $591Free CancellationRating
8.0
11,764 reviews
Search Alaska Airlines flights
Hawaiian AirlinesPriceFrom $649Free CancellationRating
7.8
2,829 reviews
Search Hawaiian Airlines flights
Philippine AirlinesPriceFrom $758Free CancellationRating
7.3
955 reviews
Search Philippine Airlines flights
Air CanadaPriceFrom $779Free CancellationRating
7.1
10,644 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $789Free CancellationRating
7.5
973 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $804Free CancellationRating
7.2
11,169 reviews
Search American Airlines flights
United AirlinesPriceFrom $830Free CancellationRating
7.4
9,189 reviews
Search United Airlines flights
DeltaPriceFrom $842Free CancellationRating
7.9
8,085 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
Coogee
Manly
Lithgow
Leura
Penrith
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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