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Cheap flights from Seattle to Sydney from $379

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 11/27. 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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Cheap round-trip flights

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Philippine Airlines Logo
9:30 pm - 9:50 amSEA-SYD
41h 20m1 stop
Philippine Airlines Logo
11:35 am - 7:40 pmSYD-SEA
26h 05m1 stop
$883Philippine Airlines
Find Deal
Fri, Mar 6 - Sun, Mar 15
Qantas Airways Logo
6:00 am - 9:00 amSEA-SYD
32h 00m1 stop
Qantas Airways Logo
7:05 am - 6:54 pmSYD-SEA
30h 49m2 stops
$958Qantas Airways
Find Deal
Sat, Feb 7 - Tue, Feb 24
Air Canada Logo
3:40 pm - 9:35 amSEA-SYD
22h 55m1 stop
Air Canada Logo
11:20 am - 2:31 pmSYD-SEA
22h 11m1 stop
$959Air Canada
Find Deal
Sun, Nov 30 - Sun, Dec 14
Philippine Airlines Logo
10:30 pm - 9:50 amSEA-SYD
41h 20m1 stop
Philippine Airlines Logo
11:35 am - 7:40 pmSYD-SEA
26h 05m1 stop
$966Philippine Airlines
Find Deal
Sun, Mar 8 - Thu, Mar 26
Multiple Airlines Logo
9:30 pm - 9:50 amSEA-SYD
41h 20m1 stop
Multiple Airlines Logo
9:20 pm - 9:31 amSYD-SEA
30h 11m2 stops
$972Multiple Airlines
Find Deal
Fri, Mar 6 - Sun, Mar 15
ANA Logo
4:30 pm - 7:15 pmSEA-SYD
33h 45m1 stop
ANA Logo
11:50 am - 6:36 pmSYD-SEA
23h 46m2 stops
$980ANA
Find Deal
Wed, May 6 - Wed, May 13
ANA Logo
4:30 pm - 7:15 pmSEA-SYD
33h 45m1 stop
ANA Logo
11:50 am - 6:36 pmSYD-SEA
23h 46m2 stops
$981ANA
Find Deal
Mon, May 18 - Sun, May 31
Qantas Airways Logo
4:50 pm - 7:25 amSEA-SYD
19h 35m1 stop
Qantas Airways Logo
7:05 am - 1:59 pmSYD-SEA
25h 54m2 stops
$987Qantas Airways
Find Deal
Tue, Feb 17 - Wed, Mar 4
Qantas Airways Logo
6:00 am - 9:00 amSEA-SYD
32h 00m1 stop
Qantas Airways Logo
7:05 am - 12:29 pmSYD-SEA
24h 24m2 stops
$988Qantas Airways
Find Deal
Wed, Dec 31 - Tue, Feb 10
Qantas Airways Logo
6:00 am - 9:00 amSEA-SYD
32h 00m1 stop
Qantas Airways Logo
7:05 am - 12:29 pmSYD-SEA
24h 24m2 stops
$989Qantas Airways
Find Deal
Wed, Dec 31 - Tue, Feb 10

Philippine Airlines flights from Seattle to Sydney

Our best Philippine Airlines deals on Seattle to Sydney flight tickets
Philippine Airlines
Mar 6
SEA9:30 pmSeattle/Tacoma Intl
41h 20m
1 stop
SYD9:50 amSydney Kingsford Smith
Mar 15
SYD11:35 amSydney Kingsford Smith
26h 05m
1 stop
SEA7:40 pmSeattle/Tacoma Intl
$883
Find similar
Philippine Airlines
Mar 8
SEA10:30 pmSeattle/Tacoma Intl
41h 20m
1 stop
SYD9:50 amSydney Kingsford Smith
Mar 26
SYD11:35 amSydney Kingsford Smith
26h 05m
1 stop
SEA7:40 pmSeattle/Tacoma Intl
$966
Find similar
Philippine Airlines
Mar 6
SEA9:30 pmSeattle/Tacoma Intl
41h 20m
1 stop
SYD9:50 amSydney Kingsford Smith
Mar 26
SYD11:35 amSydney Kingsford Smith
26h 05m
1 stop
SEA7:40 pmSeattle/Tacoma Intl
$995
Find similar

Qantas Airways flights from Seattle to Sydney

Our best Qantas Airways deals on Seattle to Sydney flight tickets
Qantas Airways
Feb 7
SEA6:00 amSeattle/Tacoma Intl
32h 00m
1 stop
SYD9:00 amSydney Kingsford Smith
Feb 24
SYD7:05 amSydney Kingsford Smith
30h 49m
2 stops
SEA6:54 pmSeattle/Tacoma Intl
$958
Find similar
Qantas Airways
Feb 17
SEA4:50 pmSeattle/Tacoma Intl
19h 35m
1 stop
SYD7:25 amSydney Kingsford Smith
Mar 4
SYD7:05 amSydney Kingsford Smith
25h 54m
2 stops
SEA1:59 pmSeattle/Tacoma Intl
$987
Find similar
Qantas Airways
Dec 31
SEA6:00 amSeattle/Tacoma Intl
32h 00m
1 stop
SYD9:00 amSydney Kingsford Smith
Feb 10
SYD7:05 amSydney Kingsford Smith
24h 24m
2 stops
SEA12:29 pmSeattle/Tacoma Intl
$988
Find similar

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 November 19, 2025.
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 3/6

9:30 pm-9:50 am

1 stop41h 20m

Sydney Kingsford Smith

Sun 3/15

11:35 am-7:40 pm

1 stop26h 05m

$883

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

7:05 am-6:54 pm

2 stops30h 49m

$958

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 11/30

3:40 pm-9:35 am

1 stop22h 55m

Sydney Kingsford Smith

Sun 12/14

11:20 am-2:31 pm

1 stop22h 11m

$959

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 3/8

10:30 pm-9:50 am

1 stop41h 20m

Sydney Kingsford Smith

Thu 3/26

11:35 am-7:40 pm

1 stop26h 05m

$966

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 3/6

9:30 pm-9:50 am

1 stop41h 20m

Sydney Kingsford Smith

Sun 3/15

9:20 pm-9:31 am

2 stops30h 11m

$972

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 5/6

4:30 pm-7:15 pm

1 stop33h 45m

Sydney Kingsford Smith

Wed 5/13

11:50 am-6:36 pm

2 stops23h 46m

$980

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/18

4:30 pm-7:15 pm

1 stop33h 45m

Sydney Kingsford Smith

Sun 5/31

11:50 am-6:36 pm

2 stops23h 46m

$981

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 2/17

4:50 pm-7:25 am

1 stop19h 35m

Sydney Kingsford Smith

Wed 3/4

7:05 am-1:59 pm

2 stops25h 54m

$987

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 12/31

6:00 am-9:00 am

1 stop32h 00m

Sydney Kingsford Smith

Tue 2/10

7:05 am-12:29 pm

2 stops24h 24m

$988

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 12/31

6:00 am-9:00 am

1 stop32h 00m

Sydney Kingsford Smith

Tue 2/10

7:05 am-12:29 pm

2 stops24h 24m

$989

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 $895.

What is the cheapest day to depart on your flight to Sydney?

The cheapest day to depart from Seattle to Sydney is on a Tuesday when prices can be found for as low as $1,078. The most expensive day to fly to Sydney is Thursday, with ticket prices averaging around $1,156.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the evening. momondo users have found flights departing from Seattle to Sydney in the evening for as low as $1,078. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Sydney are more costly in the morning, with an average ticket price of $1,152. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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 $1,061 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 $870 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of November 2025, prices for Seattle to Sydney flights are approximately 41% 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

Direct flights

None
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 18h 35m.

  • 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
1,007 reviews
Search ANA flights
Alaska AirlinesPriceFrom $591Free CancellationRating
8.0
11,321 reviews
Search Alaska Airlines flights
Air CanadaPriceFrom $779Free CancellationRating
7.1
10,462 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $789Free CancellationRating
7.5
942 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $804Free CancellationRating
7.2
11,046 reviews
Search American Airlines flights
Hawaiian AirlinesPriceFrom $820Free CancellationRating
7.8
2,811 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $832Free CancellationRating
7.4
9,027 reviews
Search United Airlines flights
DeltaPriceFrom $842Free CancellationRating
7.9
8,004 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
Cronulla
Manly
Penrith
Leura
Lithgow
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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