Cheap flights from Seattle to Sydney from $395
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 9/21. 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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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, March 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 $1,030. If you are unable to visit Sydney during the month of March, then departing from Seattle during the month February is also very affordable. Most momondo users find prices during this month for around $1,048.
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 24 weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,138 when searching 24 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 $994 on momondo.
What is the cheapest airline that flies from Seattle/Tacoma Intl to Sydney Kingsford Smith?
Air Canada, Qantas Airways, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Sydney Kingsford Smith
What airlines fly to Sydney?
Air Canada, United Airlines and Delta 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 8 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.
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
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 8 as of June 2025.
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 (32% of total bookings). The next most popular airlines are United Airlines (25%), Delta (16%), and Hawaiian Airlines (9%).
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 $791 | Free Cancellation | Rating 8.3 882 reviews | |||
| PriceFrom $807 | Free Cancellation | Rating 7.5 854 reviews | |||
| PriceFrom $807 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $831 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $833 | Free Cancellation | Rating 7.1 9,537 reviews | |||
| PriceFrom $858 | Free Cancellation | Rating 7.8 2,494 reviews | |||
| PriceFrom $859 | Free Cancellation | Rating 8.0 7,946 reviews | |||
| PriceFrom $911 | Free Cancellation | Rating 8.0 10,000 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.