Cheap flights from Seattle to Sydney from $486
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 4/1. 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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Fly from
Fly to
Route
Depart
Return
SeattleSydney
SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith
SEASYD
Seattle/Tacoma Intl
Mon 11/9
10:10 am-9:35 am
1 stop28h 25m
Sydney Kingsford Smith
Sun 11/15
11:20 am-9:32 am
1 stop17h 12m
SeattleSydney
SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith
SEASYD
Seattle/Tacoma Intl
Mon 11/9
3:15 pm-9:35 am
1 stop23h 20m
Sydney Kingsford Smith
Sun 11/15
9:00 am-9:32 am
2 stops19h 32m
SeattleSydney
SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith
SEASYD
Seattle/Tacoma Intl
Tue 2/2
5:40 pm-9:35 am
2 stops44h 55m
Sydney Kingsford Smith
Tue 2/16
11:20 am-7:58 am
2 stops39h 38m
SeattleSydney
SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith
SEASYD
Seattle/Tacoma Intl
Thu 3/18
10:30 pm-9:50 am
1 stop41h 20m
Sydney Kingsford Smith
Wed 4/21
11:35 am-7:35 pm
1 stop25h 00m
SeattleSydney
SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith
SEASYD
Seattle/Tacoma Intl
Mon 10/19
4:37 pm-8:05 am
1 stop21h 28m
Sydney Kingsford Smith
Mon 11/2
11:15 am-2:12 pm
1 stop21h 57m
SeattleSydney
SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith
SEASYD
Seattle/Tacoma Intl
Tue 11/3
5:59 pm-9:00 am
1 stop20h 01m
Sydney Kingsford Smith
Tue 11/10
11:10 am-1:00 pm
1 stop20h 50m
SeattleSydney
SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith
SEASYD
Seattle/Tacoma Intl
Mon 10/19
1:37 pm-8:05 am
1 stop24h 28m
Sydney Kingsford Smith
Mon 11/2
11:15 am-1:00 pm
1 stop20h 45m
SeattleSydney
SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith
SEASYD
Seattle/Tacoma Intl
Wed 1/20
7:10 am-6:25 am
1 stop28h 15m
Sydney Kingsford Smith
Wed 2/3
11:20 am-12:43 pm
1 stop20h 23m
SeattleSydney
SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith
SEASYD
Seattle/Tacoma Intl
Tue 1/26
2:30 pm-6:50 am
1 stop21h 20m
Sydney Kingsford Smith
Wed 2/17
10:40 am-10:35 am
1 stop18h 55m
SeattleSydney
SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith
SEASYD
Seattle/Tacoma Intl
Sun 1/24
2:30 pm-8:30 am
1 stop23h 00m
Sydney Kingsford Smith
Tue 2/16
1:35 pm-2:47 pm
1 stop20h 12m
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 typical price of a round-trip flight between Seattle and Sydney?
Prices are currently typical for flights on this route.
Typical prices usually range from $938 to $1,186.The lowest price recently found on this route was $965.
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 $804. 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 $1,044.
How far in advance should I book a flight from Seattle 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 $1,170 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 $1,021 on momondo.
What is the cheapest airline that flies from Seattle/Tacoma Intl to Sydney Kingsford Smith?
American Airlines and United Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Sydney Kingsford Smith
What airlines fly to Sydney?
Air Canada, ANA and United Airlines are the top three most popular airlines that fly to Sydney from Seattle according to our data. Air Canada is the first choice among our users, with 39% of people opting to fly with this airline when traveling to Sydney. Keep in mind that there are 9 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.
Which airport is the most popular layover for flights between Seattle and Sydney?
Los Angeles (LAX) was the most common stop: 58% of momondo users choosing 1-stop flights on this route connected there.
Which layover airport offers the lowest fares from Seattle to Sydney?
Flights via Manila (MNL) offer the lowest average round-trip price of $844.
Which layover airport has the shortest travel time from Seattle to Sydney?
Flights connecting via Vancouver (YVR) have the shortest average one-way travel time: 18h 39m.
Which layover airport has the shortest connection time from Seattle to Sydney?
Vancouver (YVR) has the shortest average layover time for this route: 2h 19m.
When to book flights from Seattle to Sydney
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
Frequently asked questions about flying from Seattle to Sydney
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?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport is 9 as of October 2026.
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?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Seattle to Sydney is Air Canada (28% of total bookings). The next most popular airlines are ANA (17%), United Airlines (15%), and Delta (12%).
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 | ||
|---|---|---|---|---|---|
| PriceFrom $583 | Free Cancellation | Rating 8.3 1,321 reviews | |||
| PriceFrom $819 | Free Cancellation | Rating 7.5 1,104 reviews | |||
| PriceFrom $822 | Free Cancellation | Rating 7.8 2,806 reviews | |||
| PriceFrom $888 | Free Cancellation | Rating 7.4 10,324 reviews | |||
| PriceFrom $898 | Free Cancellation | Rating 7.9 13,039 reviews | |||
| PriceFrom $938 | Free Cancellation | Rating 7.1 11,748 reviews | |||
| PriceFrom $947 | Free Cancellation | Rating 8.0 671 reviews | |||
| PriceFrom $975 | Free Cancellation | Rating 7.0 12,147 reviews | |||
| PriceFrom $978 | Free Cancellation | Rating 7.8 8,646 reviews |
Traveling to a place near Sydney?
Book flights to Sydney if you plan to visit one of these locationsWhy 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.