Cheap flights from Washington, D.C. Dulles Intl Airport to Sydney from $798

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SYD
1 Sep — 8 Sep1
1 adult

Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Sydney Kingsford Smith are usually found in April or February, booked 65 days in advance, depart on a Tuesday or Saturday and return on a Friday

Cheap flight deals from Dulles Intl to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Sydney (SYD). 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 27 August 2025.

Round-trip from

$1,666

One-way from

$798

Popular in

December

Cheapest in

April

Average price

$1,552
20/9-3/10
  • 20/9-3/10
  • 4 total stops
  • 59h 34m total
  • Washington, D.C. to Sydney
15/9
  • 15/9
  • 2 total stops
  • 34h 55m total
  • Washington, D.C. to Sydney
Highest demand for flights based on searches. 18% potential increase in price ($689 potential increase over avg. return price).
Cheapest flight prices on average. 3% potential price decrease ($107 potential savings vs. average return price).
Average for round-trip flights in August 2025

Find flight deals from Dulles Intl to Sydney

Cheapest flights from Dulles Intl to Sydney
Explore the most affordable flight options available from Dulles Intl to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 August 2025.

Sat 20/907:00IAD - SYD
2 stops34h 05mMultiple Airlines
Fri 3/1012:10SYD - IAD
2 stops25h 29mMultiple Airlines
Deal found 26/8$1,666
Mon 8/906:10IAD - SYD
2 stops34h 55mMultiple Airlines
Mon 15/912:10SYD - IAD
2 stops26h 05mMultiple Airlines
Deal found 25/8$1,691
Sun 31/806:10IAD - SYD
2 stops34h 45mMultiple Airlines
Sun 14/912:10SYD - IAD
2 stops26h 05mMultiple Airlines
Deal found 26/8$1,734
Wed 1/1007:00IAD - SYD
2 stops34h 30mMultiple Airlines
Wed 15/1010:10SYD - IAD
2 stops29h 13mMultiple Airlines
Deal found 25/8$1,754
Sat 30/806:10IAD - SYD
2 stops34h 45mMultiple Airlines
Mon 15/912:10SYD - IAD
2 stops26h 05mMultiple Airlines
Deal found 25/8$1,763
Sat 25/1007:15IAD - SYD
2 stops34h 45mMultiple Airlines
Sun 2/1114:05SYD - IAD
2 stops26h 06mMultiple Airlines
Deal found 26/8$1,765
Mon 10/1107:43IAD - SYD
2 stops31h 42mMultiple Airlines
Sun 23/1117:45SYD - IAD
2 stops28h 33mMultiple Airlines
Deal found 25/8$1,856
Tue 28/1017:37IAD - SYD
2 stops28h 08mMultiple Airlines
Thu 6/1114:00SYD - IAD
2 stops24h 18mMultiple Airlines
Deal found 26/8$1,857
Thu 9/1006:25IAD - SYD
2 stops34h 05mMultiple Airlines
Thu 16/1010:10SYD - IAD
2 stops29h 13mMultiple Airlines
Deal found 24/8$1,859
Tue 9/917:40IAD - SYD
2 stops38h 30mMultiple Airlines
Tue 28/1014:15SYD - IAD
2 stops23h 36mMultiple Airlines
Deal found 26/8$1,885
Tue 21/1008:50IAD - SYD
2 stops32h 55mAir New Zealand
Tue 11/1111:45SYD - IAD
2 stops25h 41mAir New Zealand
Deal found 25/8$1,904

Cheapflights Fare Finder

 
Customise your flight search to find flights from Dulles Intl to Sydney 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 27 August 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Sydney that are best for you.

Fly from

Dulles Intl

Fly to

Sydney

Route

Depart

Return

Price

Washington, D.C.Sydney

IAD - SYD

IADSYD

Washington, D.C. Dulles Intl

Sat 20/9

07:00-07:05

2 stops34h 05m

Sydney Kingsford Smith

Fri 3/10

12:10-23:39

2 stops25h 29m

$1,666

Washington, D.C.Sydney

IAD - SYD

IADSYD

Washington, D.C. Dulles Intl

Wed 22/10

12:45-08:45

2 stops29h 00m

Sydney Kingsford Smith

Mon 3/11

09:55-23:44

2 stops29h 49m

$1,905

Washington, D.C.Sydney

IAD - SYD

IADSYD

Washington, D.C. Dulles Intl

Tue 28/10

17:37-12:45

2 stops28h 08m

Sydney Kingsford Smith

Sat 8/11

06:00-22:18

2 stops32h 18m

$1,930

Washington, D.C.Sydney

IAD - SYD

IADSYD

Washington, D.C. Dulles Intl

Tue 4/11

17:27-12:30

2 stops27h 03m

Sydney Kingsford Smith

Sat 15/11

14:30-22:18

2 stops23h 48m

$1,934

Washington, D.C.Sydney

IAD - SYD

IADSYD

Washington, D.C. Dulles Intl

Tue 21/10

17:37-22:10

2 stops37h 33m

Sydney Kingsford Smith

Thu 13/11

06:00-22:18

2 stops32h 18m

$1,934

Washington, D.C.Sydney

IAD - SYD

IADSYD

Washington, D.C. Dulles Intl

Mon 3/11

08:30-08:45

2 stops32h 15m

Sydney Kingsford Smith

Sun 16/11

19:15-20:51

2 stops41h 36m

$1,937

Washington, D.C.Sydney

IAD - SYD

IADSYD

Washington, D.C. Dulles Intl

Wed 5/11

12:55-21:45

2 stops40h 50m

Sydney Kingsford Smith

Mon 17/11

11:45-23:44

2 stops27h 59m

$1,940

Washington, D.C.Sydney

IAD - SYD

IADSYD

Washington, D.C. Dulles Intl

Sat 1/11

22:10-08:45

2 stops43h 35m

Sydney Kingsford Smith

Sat 8/11

19:15-22:13

2 stops42h 58m

$1,956

Washington, D.C.Sydney

IAD - SYD

IADSYD

Washington, D.C. Dulles Intl

Tue 28/10

17:37-12:45

2 stops28h 08m

Sydney Kingsford Smith

Thu 6/11

14:00-22:18

2 stops24h 18m

$1,956

Washington, D.C.Sydney

IAD - SYD

IADSYD

Washington, D.C. Dulles Intl

Wed 29/10

12:55-08:45

2 stops28h 50m

Sydney Kingsford Smith

Thu 29/1

11:45-22:18

2 stops26h 33m

$1,979

Flights are sorted by cheapest return flights first.

Deals found on 26/8

Showing 1-10 of 22 results
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Best time to book a flight from Dulles Intl to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Dulles Intl 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.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Sydney

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Sydney?

Use this chart to determine the optimal time to book a return flight from Dulles Intl to Sydney. Price data was last updated on 22 August 2025.

The best time to book flights from Washington, D.C. Dulles Intl Airport to Sydney is 65 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Sydney?

Currently, May is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Sydney (average of $129). Flying from Washington, D.C. Dulles Intl Airport to Sydney in October is currently the most expensive (average of $171). 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.

What is the cheapest time of day to fly from IAD to SYD?

Find hourly flight availability from Dulles Intl to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 27 August 2025.

When flying from Washington, D.C. Dulles Intl Airport to Sydney, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 33% versus a flight in the afternoon.

How much does it cost for a return flight from Washington, D.C. Dulles Intl Airport to Sydney?

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. 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 Sydney. Reviews last updated 27 August 2025.
See what other customers who have flown with United Airlines from Washington, D.C. Dulles Intl Airport to Sydney have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Entertainment

7.1

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Entertainment

7.1

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airport do you fly into for flights to Sydney from Washington, D.C. Dulles Intl?

    If you book a flight to Sydney from Washington, D.C. Dulles Intl, you will be flying to Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 7.5 km from the centre of Sydney. There are 0 flights from Washington, D.C. Dulles Intl to Kingsford Smith per day from 1 airline.

  • How long is the flight from Washington, D.C. Dulles Intl Airport to Sydney?

    For as low as $1,905, Air New Zealand can have you in Sydney from Washington, D.C. Dulles Intl Airport in 29h. Airlines will cover a distance of 15670 km.

  • What is the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to Sydney round-trip?

    Currently priced at $2,256, United Airlines will fly you from Washington, D.C. Dulles Intl Airport to Sydney and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip.

  • Can I find deals for flights from Dulles Intl to Sydney that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Sydney?

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

  • Can I find deals for business class flights from Dulles Intl to Sydney?

    Yes. Cheapflights offers flight deals from Dulles Intl to Sydney 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 Washington, D.C. Dulles Intl Airport to Sydney?

    Currently, May is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Sydney (average of $129). Flying from Washington, D.C. Dulles Intl Airport to Sydney in October is currently the most expensive (average of $171). 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

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Katoomba
Penrith
Coogee
Terrigal
Cronulla
Manly
Lithgow
Randwick
Bondi Beach
Leura

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Alternative routes for Dulles Intl to Sydney

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Dulles Intl to Sydney

Discover the top airline that operate flights from Dulles Intl to Sydney. 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 647,157 searches. Data last updated 27 August 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$2,256Average$2,742FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Dulles Intl to Sydney?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Dulles Intl to Sydney. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Sydney?

Cheapflights simply makes it quick and affordable to book flights from Dulles Intl to Sydney by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Dulles Intl to Sydney with no change fees?

Certainly. Search results for flights to Sydney from Dulles Intl shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Dulles Intl to Sydney become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Sydney from Dulles Intl today and book when prices fit your budget.

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