$655 Cheap Flights from Seattle (SEA) to Adelaide (ADL)

View $655 flight on Tue, Mar 10, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Adelaide, SA Airport (ADL)

Cheap Flights from Seattle to Adelaide (SEA-ADL)

Prices were available within the past 7 days and start at $655 for one-way flights and $1,037 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Tue, Mar 10 - Fri, Mar 20
SEA
Seattle
ADL
Adelaide
$1,037 Roundtrip, found 7 hours ago
$1,037
Roundtrip
found 7 hours ago
Select Air Canada flight, departing Tue, Mar 10 from Seattle to Adelaide, returning Fri, Mar 20, priced at $1,037 found 7 hours ago
Air Canada
Thu, Mar 12 - Wed, Mar 18
SEA
Seattle
ADL
Adelaide
$1,038 Roundtrip, found 8 hours ago
$1,038
Roundtrip
found 8 hours ago
Select Air Canada flight, departing Thu, Mar 12 from Seattle to Adelaide, returning Wed, Mar 18, priced at $1,038 found 8 hours ago
Air Canada
Tue, Mar 10 - Fri, Mar 20
SEA
Seattle
ADL
Adelaide
$1,041 Roundtrip, found 7 hours ago
$1,041
Roundtrip
found 7 hours ago
Select Air Canada flight, departing Tue, Mar 10 from Seattle to Adelaide, returning Fri, Mar 20, priced at $1,041 found 7 hours ago
Air Canada
Thu, Mar 12 - Wed, Mar 18
SEA
Seattle
ADL
Adelaide
$1,042 Roundtrip, found 8 hours ago
$1,042
Roundtrip
found 8 hours ago
Select Air Canada flight, departing Thu, Mar 12 from Seattle to Adelaide, returning Wed, Mar 18, priced at $1,042 found 8 hours ago
Air Canada
Tue, Mar 10 - Fri, Mar 20
SEA
Seattle
ADL
Adelaide
$1,043 Roundtrip, found 7 hours ago
$1,043
Roundtrip
found 7 hours ago
Select Air Canada flight, departing Tue, Mar 10 from Seattle to Adelaide, returning Fri, Mar 20, priced at $1,043 found 7 hours ago
Air Canada
Tue, Mar 10 - Fri, Mar 20
SEA
Seattle
ADL
Adelaide
$1,047 Roundtrip, found 7 hours ago
$1,047
Roundtrip
found 7 hours ago
Select Air Canada flight, departing Tue, Mar 10 from Seattle to Adelaide, returning Fri, Mar 20, priced at $1,047 found 7 hours ago
Hawaiian Airlines
Wed, Dec 3 - Tue, Dec 16
SEA
Seattle
ADL
Adelaide
$1,227 Roundtrip, found 1 day ago
$1,227
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Wed, Dec 3 from Seattle to Adelaide, returning Tue, Dec 16, priced at $1,227 found 1 day ago
Qantas Airways
Wed, Nov 12 - Tue, Nov 25
SEA
Seattle
ADL
Adelaide
$1,289 Roundtrip, found 3 days ago
$1,289
Roundtrip
found 3 days ago
Select Qantas Airways flight, departing Wed, Nov 12 from Seattle to Adelaide, returning Tue, Nov 25, priced at $1,289 found 3 days ago
Cathay Pacific
Thu, Mar 12 - Wed, Mar 18
SEA
Seattle
ADL
Adelaide
$1,307 Roundtrip, found 8 hours ago
$1,307
Roundtrip
found 8 hours ago
Select Cathay Pacific flight, departing Thu, Mar 12 from Seattle to Adelaide, returning Wed, Mar 18, priced at $1,307 found 8 hours ago
United
Sun, Feb 15 - Sat, Feb 28
SEA
Seattle
ADL
Adelaide
$1,497 Roundtrip, found 1 day ago
$1,497
Roundtrip
found 1 day ago
Select United flight, departing Sun, Feb 15 from Seattle to Adelaide, returning Sat, Feb 28, priced at $1,497 found 1 day ago

Alternative airports near Adelaide

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Adelaide, SA Airport ADL. Cheapest and Closest option available. Average driving time to city center is 11 minutes. Flights from $1,488
ADL
Adelaide, SA Airport
CheapestClosest
Average driving time to city center11 min
Flights from $1,488
Flights from Seattle (SEA) to Adelaide (ADL)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Adelaide
Airlines serving
Air Canada, Air New Zealand, Alaska Airlines, All Nippon Airways, American Airlines, Cathay Pacific, Emirates, Hawaiian Airlines, Lufthansa, Qantas Airways, Qatar Airways, Singapore Airlines, Swiss International Air Lines, United
Roundtrip price
$1,037
Distance
8337 mi

Seattle to Adelaide Flights

The cheapest times to fly from Seattle to Adelaide

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Adelaide are during the month of March. You can find some of the cheapest flights from Seattle to Adelaide with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Adelaide

Sunday is one of the best days to book for cheap flights from Seattle to Adelaide: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Adelaide

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Adelaide in 2025. You can also book with separate airlines for your outbound and return journeys, from $655 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Adelaide flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Adelaide airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Adelaide Airport (ADL) cost?
Get a cheap one-way flight from $655 or cheap return flight from $1,037 from Seattle - Tacoma Intl. Airport (SEA) to Adelaide Airport (ADL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Adelaide Airport (ADL)?
March is the least expensive month to fly from SEA to ADL. Traveling during quieter months is often the key to finding a great deal.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Adelaide Airport (ADL)?
To find the cheapest airline flying from SEA to ADL, use Expedia's filter tool. Customize your search based on what matters most to you, such as preferred carriers and ideal departure window. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Adelaide Airport (ADL)?
There are no daily direct flights from Seattle - Tacoma Intl. Airport (SEA) to Adelaide Airport (ADL). But you can opt for flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be soaring above the clouds before you know it.
What day of the week has the most flights from SEA to ADL?
Generally you'll find the most flight options available on a Friday. Tuesdays tend to be the quietest.* However, this can change based on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Adelaide Airport (ADL)?
To avoid possible delays on the Seattle - Tacoma Intl. Airport (SEA) to Adelaide Airport (ADL) route, aim to travel before 3 PM. Departures after this time are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Adelaide Airport (ADL) last-minute?
Waiting until right before your break to book a flight from SEA to ADL generally means paying more. Although you may find some last-minute offers, they're not always guaranteed. Be flexible with your itinerary for the best chance of snagging a bargain.
Is it cheaper to book a SEA to ADL flight and hotel package?
Compared with arranging hotels and flights separately, booking a SEA to ADL flight and hotel package with Expedia could lead to significant savings. What's more, managing everything in one place takes the hassle out of travel planning. Simply pick your flights and select from our wide range of hotels, then customize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Adelaide Airport (ADL)?
In most cases, you're able to cancel or reschedule your SEA to ADL flight. However, additional fees may apply, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you need further information, visit our Customer Service portal.

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*Available to One Key members.