HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Adelaide

$1,046+ Cheap flights from Seattle (SEA) to Adelaide (ADL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ADL
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Adelaide with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 September 17, 2025.

Round-trip from

$1,059
(Trip.com)

Popular in

January

Cheapest in

September

Average price

$1,088
From Seattle/Tacoma Intl to Adelaide
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($300 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($79 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Seattle to Adelaide

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 September 17, 2025.

This Priceline deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/244:59 pmSEA - ADL
2 stops26h 36mQantas Airways
Wed 10/1512:45 pmADL - SEA
2 stops24h 52mQantas Airways
Deal found 9/15$1,046
This Trip.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/247:44 amSEA - ADL
2 stops31h 31mMultiple Airlines
Sat 11/227:45 amADL - SEA
2 stops34h 02mMultiple Airlines
Deal found 9/17$1,059
This FlightHub deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/249:15 pmSEA - ADL
2 stops45h 50mMultiple Airlines
Mon 11/241:15 pmADL - SEA
2 stops23h 13mMultiple Airlines
Deal found 9/17$1,085
This oojo deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/17:40 amSEA - ADL
2 stops33h 45mQantas Airways
Sat 11/811:40 amADL - SEA
2 stops25h 01mQantas Airways
Deal found 9/17$1,089
This Jetabroad deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/225:59 pmSEA - ADL
2 stops25h 36mMultiple Airlines
Mon 9/2912:45 pmADL - SEA
2 stops24h 09mMultiple Airlines
Deal found 9/14$1,144
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/131:05 pmSEA - ADL
1 stop25h 55mUnited Airlines
Mon 1/52:55 pmADL - SEA
1 stop24h 42mUnited Airlines
Deal found 9/15$1,210
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2411:10 pmSEA - ADL
2 stops42h 15mUnited Airlines
Mon 11/246:00 amADL - SEA
3 stops33h 21mUnited Airlines
Deal found 9/17$1,285
This Mytrip deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/311:10 amSEA - ADL
2 stops35h 35mMultiple Airlines
Sat 11/86:10 amADL - SEA
2 stops21h 51mMultiple Airlines
Deal found 9/17$1,554
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1211:59 pmSEA - ADL
2 stops39h 01mUnited Airlines
Mon 1/52:55 pmADL - SEA
1 stop28h 34mUnited Airlines
Deal found 9/15$1,565
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/113:25 pmSEA - ADL
2 stops28h 15mUnited Airlines
Mon 1/52:55 pmADL - SEA
1 stop28h 34mUnited Airlines
Deal found 9/15$1,588

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated September 17, 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

Wed 9/24

4:59 pm-12:05 pm

2 stops26h 36m

Adelaide

Wed 10/15

12:45 pm-8:07 pm

2 stops24h 52m

$1,046

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Fri 10/24

7:44 am-8:45 am

2 stops31h 31m

Adelaide

Sat 11/22

7:45 am-11:17 pm

2 stops34h 02m

$1,059

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 11/1

7:40 am-10:55 am

2 stops33h 45m

Adelaide

Sat 11/8

11:40 am-6:11 pm

2 stops25h 01m

$1,089

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Mon 12/15

7:29 pm-9:30 am

1 stop19h 31m

Adelaide

Mon 1/5

2:55 pm-4:52 pm

1 stop20h 27m

$1,210

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 12/13

1:05 pm-9:30 am

1 stop25h 55m

Adelaide

Mon 1/5

2:55 pm-9:07 pm

1 stop24h 42m

$1,210

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 12/14

11:59 pm-9:30 am

2 stops39h 01m

Adelaide

Mon 1/5

2:55 pm-12:59 am

1 stop28h 34m

$1,215

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Fri 10/24

11:10 pm-10:55 am

2 stops42h 15m

Adelaide

Sat 11/22

6:00 am-9:13 pm

3 stops33h 43m

$1,285

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Fri 10/24

11:10 pm-10:55 am

2 stops42h 15m

Adelaide

Mon 11/24

6:00 am-8:51 pm

3 stops33h 21m

$1,285

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Fri 12/12

11:59 pm-9:30 am

2 stops39h 01m

Adelaide

Mon 1/5

2:55 pm-12:59 am

1 stop28h 34m

$1,565

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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 round-trip 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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Adelaide

What is the cheapest time of day to fly from SEA to ADL?

Find hourly flight availability from Seattle to Adelaide. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Adelaide in the morning. If you’re flexible enough to do this you can expect to save up to 26% on your trip compared to booking a flight at noon.

Reviews of airlines servicing Adelaide

Get insights into the airlines that provide service to Adelaide. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Adelaide. Reviews last updated September 17, 2025.
Read through reviews of airlines operating flights from Seattle to Adelaide, such as Qantas Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
907 reviews

Comfort

7.5

Entertainment

7.2

Food

7.0

Boarding

7.7

Crew

8.2

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

SYD - BNE

Great. Except I haven’t claimed my free lounge passes since 2022 on my Qantas credit card. That’s lots of flights I would have booked if you’d reminded me
Qantas Airways
7.5
Good
907 reviews
Qantas Airways
7.5
Good
907 reviews

Comfort

7.5

Entertainment

7.2

Food

7.0

Boarding

7.7

Crew

8.2

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

SYD - BNE

Great. Except I haven’t claimed my free lounge passes since 2022 on my Qantas credit card. That’s lots of flights I would have booked if you’d reminded me

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?

    For as low as $1,210, Qantas Airways can have you in Adelaide from Seattle in 19h 31m. Seattle and Adelaide are separated by a distance of 8332 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What is the cheapest airline to fly from Seattle to Adelaide round-trip?

    Qantas Airways, at $1,088, was found to be the cheapest airline from Seattle to Adelaide.. This flight start at 21% lower than the current average price 3 months from now.

  • 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 vacation 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.

  • What is the cheapest month to book a flight from Seattle to Adelaide?

    Currently, August is the cheapest month in which you can book a flight from Seattle to Adelaide (average of $1,214). Flying from Seattle to Adelaide in December is currently the most expensive (average of $2,057). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Adelaide?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top airline flying from Seattle to Adelaide

Discover the top airline that operate flights from Seattle to Adelaide. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,088Average$1,164FlexibilityNo cancel feeOn-time74%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.