$628 Cheap Flights from Washington (IAD) to Adelaide (ADL)

View $628 flight on Sat, Feb 21, 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Adelaide, SA Airport (ADL)

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Cheap Flights from Washington to Adelaide (IAD-ADL)

Prices were available within the past 7 days and start at $628 for one-way flights and $808 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Tue, Aug 18 - Tue, Sep 8
IAD
Washington
ADL
Adelaide
$808 Roundtrip, found 5 days ago
$808
Roundtrip
found 5 days ago
Select Air Canada flight, departing Tue, Aug 18 from Washington to Adelaide, returning Tue, Sep 8, priced at $808 found 5 days ago
Air Canada
Tue, May 12 - Sun, May 24
IAD
Washington
ADL
Adelaide
$809 Roundtrip, found 2 days ago
$809
Roundtrip
found 2 days ago
Select Air Canada flight, departing Tue, May 12 from Washington to Adelaide, returning Sun, May 24, priced at $809 found 2 days ago
Air Canada
Tue, Aug 18 - Tue, Sep 8
IAD
Washington
ADL
Adelaide
$813 Roundtrip, found 5 days ago
$813
Roundtrip
found 5 days ago
Select Air Canada flight, departing Tue, Aug 18 from Washington to Adelaide, returning Tue, Sep 8, priced at $813 found 5 days ago
Air Canada
Tue, May 12 - Sun, May 24
IAD
Washington
ADL
Adelaide
$814 Roundtrip, found 2 days ago
$814
Roundtrip
found 2 days ago
Select Air Canada flight, departing Tue, May 12 from Washington to Adelaide, returning Sun, May 24, priced at $814 found 2 days ago
Air Canada
Tue, Apr 14 - Mon, May 4
IAD
Washington
ADL
Adelaide
$815 Roundtrip, found 4 days ago
$815
Roundtrip
found 4 days ago
Select Air Canada flight, departing Tue, Apr 14 from Washington to Adelaide, returning Mon, May 4, priced at $815 found 4 days ago
Air Canada
Tue, Jun 16 - Tue, Jul 7
IAD
Washington
ADL
Adelaide
$818 Roundtrip, found 4 days ago
$818
Roundtrip
found 4 days ago
Select Air Canada flight, departing Tue, Jun 16 from Washington to Adelaide, returning Tue, Jul 7, priced at $818 found 4 days ago
United
Mon, Feb 2 - Mon, Feb 23
IAD
Washington
ADL
Adelaide
$1,312 Roundtrip, found 9 hours ago
$1,312
Roundtrip
found 9 hours ago
Select United flight, departing Mon, Feb 2 from Washington to Adelaide, returning Mon, Feb 23, priced at $1,312 found 9 hours ago
Air New Zealand
Wed, Feb 18 - Wed, Mar 4
IAD
Washington
ADL
Adelaide
$1,567 Roundtrip, found 5 days ago
$1,567
Roundtrip
found 5 days ago
Select Air New Zealand flight, departing Wed, Feb 18 from Washington to Adelaide, returning Wed, Mar 4, priced at $1,567 found 5 days ago
Qantas Airways
Wed, Feb 4 - Tue, Feb 17
IAD
Washington
ADL
Adelaide
$1,609 Roundtrip, found 5 days ago
$1,609
Roundtrip
found 5 days ago
Select Qantas Airways flight, departing Wed, Feb 4 from Washington to Adelaide, returning Tue, Feb 17, priced at $1,609 found 5 days ago
American Airlines
Wed, Feb 18 - Wed, Mar 4
IAD
Washington
ADL
Adelaide
$1,672 Roundtrip, found 5 days ago
$1,672
Roundtrip
found 5 days ago
Select American Airlines flight, departing Wed, Feb 18 from Washington to Adelaide, returning Wed, Mar 4, priced at $1,672 found 5 days 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 $1,702
ADL
Adelaide, SA Airport
CheapestClosest
Average driving time to city center11 min
Flights from $1,702

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Adelaide Airport (ADL) cost?
Grab a cheap one-way flight from $628 or cheap return flight from $808 from Washington Dulles Intl. Airport (IAD) to Adelaide Airport (ADL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Adelaide Airport (ADL)?
The cheapest month to fly from IAD to ADL is August, when there's less demand. Off-peak months are often when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Adelaide Airport (ADL)?
To find the cheapest airline flying from IAD to ADL, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Adelaide Airport (ADL)?
There are no daily nonstop flights departing from Washington Dulles Intl. Airport (IAD) to Adelaide Airport (ADL). But you can book flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be on your way in no time at all.
What day of the week has the most flights from IAD to ADL?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Adelaide Airport (ADL)?
To reach Adelaide Airport (ADL) on time, opt for a flight that leaves Washington Dulles Intl. Airport (IAD) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Washington Dulles Intl. Airport (IAD) to Adelaide Airport (ADL) last-minute?
Holding off until just before your departure to book a ticket from IAD to ADL often results in higher prices. Although you may find some last-minute discounts, there's no guarantee. Be flexible with your travel plans to maximize your chances of landing a bargain.
Is it cheaper to book an IAD to ADL flight and hotel package?
Compared with arranging hotels and flights separately, booking an IAD to ADL flight and hotel package with Expedia could result in significant savings. What's more, having everything in one place will take the hassle out of travel planning. Simply pick your flights and select from our wide range of stays, then personalize your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Adelaide Airport (ADL)?
Generally, it's possible to reschedule or cancel your IAD to ADL flight. However, for bookings made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Adelaide
Airlines serving
Air Canada, Air New Zealand, All Nippon Airways, American Airlines, Emirates, JetBlue Airways, Lufthansa, Malaysia Airlines, Qantas Airways, Qatar Airways, Swiss International Air Lines, United
Roundtrip price
$807
Distance
10443 mi

Book with confidence

Washington to Adelaide Flights

The cheapest times to fly from Washington 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 Washington to Adelaide are during the month of August. You can find some of the cheapest flights from Washington to Adelaide with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Adelaide

Sunday is one of the best days to book for cheap flights from Washington 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 Washington 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 Washington to Adelaide in 2025. You can also book with separate airlines for your outbound and return journeys, from $628 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 Washington 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 Washington 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.

 

Washington to Adelaide Flights

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*Available to One Key members.