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Cheap flights from Seattle to Adelaide from $1,800

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ADL
30 Nov — 7 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Adelaide

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Adelaide (ADL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 31 October 2025.

Round-trip from

$1,800

Popular in

January

Cheapest in

September
Air Canada
  • Air Canada
  • 15/3-19/3
  • 4 total stops
  • 55h 01m total
  • Seattle to Adelaide
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($631 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($200 potential savings vs. average return price).
Search Deals

Find flight deals from Seattle to Adelaide

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Adelaide
Explore the most affordable flight options available from Seattle to Adelaide. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 October 2025.

Thu 25/1213:55SEA - ADL
2 stops25h 05mUnited Airlines
Sat 3/114:55ADL - SEA
1 stop28h 34mUnited Airlines
Deal found 29/10$2,365
Fri 12/1206:25SEA - ADL
2 stops38h 50mQantas Airways
Fri 19/1206:25ADL - SEA
2 stops30h 48mQantas Airways
Deal found 27/10$2,742
Sun 14/1206:25SEA - ADL
2 stops36h 10mQantas Airways
Sun 21/1206:00ADL - SEA
2 stops31h 13mQantas Airways
Deal found 29/10$3,595
Sat 13/1200:10SEA - ADL
3 stops35h 35mMultiple Airlines
Sun 21/1216:30ADL - SEA
3 stops35h 31mMultiple Airlines
Deal found 29/10$3,903
Fri 12/1217:59SEA - ADL
3 stops30h 21mMultiple Airlines
Fri 19/1211:55ADL - SEA
2 stops23h 24mMultiple Airlines
Deal found 27/10$3,950
Sun 14/1223:59SEA - ADL
2 stops39h 01mUnited Airlines
Sun 21/1206:10ADL - SEA
3 stops33h 37mUnited Airlines
Deal found 29/10$4,000

Cheapflights Fare Finder

 
Customise your flight search to find flights from Seattle to Adelaide 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, Cheapflights users made 647,157 searches. Data last updated 31 October 2025.
Use the filters below to find and compare flights from Seattle to Adelaide that are best for you.

Fly from

Seattle

Fly to

Adelaide

Route

Depart

Return

Price

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 15/3

20:00-13:55

2 stops24h 25m

Adelaide

Thu 19/3

06:10-19:16

2 stops30h 36m

$1,800

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Thu 25/12

13:55-09:30

2 stops25h 05m

Adelaide

Sat 3/1

14:55-00:59

1 stop28h 34m

$2,365

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 15/3

09:45-08:50

1 stop29h 35m

Adelaide

Thu 19/3

18:35-08:10

1 stop31h 05m

$2,791

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 14/12

06:25-13:05

2 stops36h 10m

Adelaide

Sun 21/12

06:00-18:43

2 stops31h 13m

$3,595

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 13/12

00:10-06:15

3 stops35h 35m

Adelaide

Sun 21/12

16:30-09:31

3 stops35h 31m

$3,903

Flights are sorted by cheapest return flights first.

Deals found on 28/10

Best time to book a flight from Seattle to Adelaide

Have a flexible travel schedule? Discover the best time to fly to Adelaide from Seattle with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Adelaide. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Adelaide?

    Air Canada and United Airlines can get you from Seattle to Adelaide in just under 24h 25m. Your travel time can differ by up to 40m. There are 13409 km between Seattle and Adelaide. Both multi-stop and direct flights can be found to your destination and back.

  • Can I find deals for flights from Seattle to Adelaide that include hotel bookings?

    Yes. In addition to deals on Seattle to Adelaide flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Adelaide?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Adelaide.

  • Can I find deals for business class flights from Seattle to Adelaide?

    Yes. Cheapflights offers flight deals from Seattle to Adelaide by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Travelling to a place near Adelaide?

Book flights to Adelaide if you plan to visit one of these locations
Glenelg

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Adelaide?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Adelaide from Seattle today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Seattle to Adelaide?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Seattle to Adelaide.

Can Cheapflights find flights from Seattle to Adelaide with no change fees?

Yes, we can. To see specific flights from Seattle to Adelaide with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Seattle to Adelaide become cheaper?

Yes, Cheapflights offers price alerts on Seattle to Adelaide flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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