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Cheap flights from Philadelphia to Australia from $709

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 23/5. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
23 Apr — 30 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Philadelphia to Australia

Enter your travel dates to find the best prices.

Cheapest flights from Philadelphia to Australia
Explore the most affordable flight options available from Philadelphia to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 24 March 2026.

Tue 26/509:25
PHL
-
SYD
1 stop31h 30m
United Airlines
Thu 20/810:20
SYD
-
PHL
1 stop24h 42m
United Airlines
Deal found 19/3$1,614
Wed 27/516:14
PHL
-
SYD
2 stops24h 46m
United Airlines
Fri 21/809:30
SYD
-
PHL
2 stops25h 32m
United Airlines
Deal found 19/3$1,620
Tue 26/509:25
PHL
-
SYD
1 stop31h 30m
United Airlines
Sat 22/810:20
SYD
-
PHL
1 stop35h 29m
United Airlines
Deal found 19/3$1,630
Sat 18/417:00
PHL
-
SYD
2 stops48h 00m
United Airlines
Sat 25/409:30
SYD
-
PHL
2 stops36h 45m
United Airlines
Deal found 19/3$1,644
Tue 8/918:37
PHL
-
SYD
1 stop22h 18m
Air New Zealand
Tue 15/910:20
SYD
-
PHL
1 stop21h 10m
Air New Zealand
Deal found 19/3$1,684
Mon 14/918:37
PHL
-
SYD
1 stop22h 18m
Air New Zealand
Sun 27/910:20
SYD
-
PHL
1 stop35h 25m
Air New Zealand
Deal found 19/3$1,701
Tue 3/1110:46
PHL
-
SYD
1 stop28h 09m
Qantas Airways
Tue 10/1110:20
SYD
-
PHL
2 stops37h 04m
Qantas Airways
Deal found 22/3$1,713
Tue 29/1214:37
PHL
-
SYD
2 stops24h 23m
United Airlines
Tue 19/111:20
SYD
-
PHL
2 stops23h 20m
United Airlines
Deal found 19/3$1,717
Thu 3/1215:13
PHL
-
SYD
2 stops27h 07m
Qantas Airways
Sun 13/1221:25
SYD
-
PHL
1 stop26h 15m
Qantas Airways
Deal found 23/3$1,758
Sun 3/512:47
PHL
-
SYD
2 stops28h 18m
Multiple Airlines
Tue 19/509:10
SYD
-
PHL
2 stops44h 06m
Multiple Airlines
Deal found 20/3$1,773
Sun 1/1115:55
PHL
-
MEL
2 stops27h 45m
Qantas Airways
Sun 15/1112:00
MEL
-
PHL
1 stop23h 05m
Qantas Airways
Deal found 19/3$1,777
Mon 4/517:37
PHL
-
SYD
1 stop23h 28m
Qantas Airways
Mon 11/509:10
SYD
-
PHL
1 stop23h 44m
Qantas Airways
Deal found 20/3$1,791

Find flight deals from Philadelphia to Australia

Keep the following information in mind while searching for Philadelphia to Australia flight deals. Data was last updated 24 March 2026.

Round-trip from

$1,614

One-way from

$709

Popular in

December

Cheapest in

April

Average price

$2,170
United Airlines
  • United Airlines
  • 26/5-20/8
  • 2 total stops
  • 56h 12m total
  • Philadelphia to Australia
Search Deals
23/5
  • 23/5
  • 3 total stops
  • 49h 15m total
  • Philadelphia to Australia
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($333 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($76 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Philadelphia to Australia 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 24 March 2026.
Use the filters below to find and compare flights from Philadelphia to Australia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 16/9

18:37-06:55

1 stop22h 18m

Sydney Kingsford Smith

Wed 30/9

10:20-16:58

1 stop20h 38m

$1,614

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Fri 29/5

18:23-06:55

1 stop22h 32m

Sydney Kingsford Smith

Thu 20/8

10:20-21:02

1 stop24h 42m

$1,614

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 1/7

15:10-07:00

2 stops25h 50m

Sydney Kingsford Smith

Mon 13/7

09:30-22:29

2 stops26h 59m

$1,620

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Wed 13/5

17:37-05:00

1 stop21h 23m

Brisbane

Sun 24/5

20:35-07:00

1 stop24h 25m

$1,846

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Wed 13/5

11:15-05:00

1 stop27h 45m

Brisbane

Sun 24/5

20:35-07:00

1 stop24h 25m

$1,847

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Wed 13/5

12:53-05:00

2 stops26h 07m

Brisbane

Sun 24/5

20:35-08:06

1 stop25h 31m

$1,854

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Tue 5/5

14:20-05:00

2 stops24h 40m

Brisbane

Tue 12/5

20:35-05:38

2 stops23h 03m

$1,854

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Fri 19/6

15:29-05:00

1 stop23h 31m

Brisbane

Sun 5/7

20:35-07:14

2 stops24h 39m

$1,926

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 15/6

14:33-06:50

2 stops26h 17m

Sydney Kingsford Smith

Mon 6/7

09:15-06:08

2 stops34h 53m

$1,949

PhiladelphiaMelbourne

PHL - MEL

PHLMEL

Philadelphia

Sat 2/5

15:21-05:00

1 stop23h 39m

Melbourne

Sat 9/5

18:45-05:52

2 stops49h 07m

$1,991

Flights are sorted by cheapest return flights first.

Deals found on 19/3

Showing 1-10 of 48 resultsSorted by cheapest first
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Best time to book a flight from Philadelphia to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia from Philadelphia 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 Philadelphia to Australia

What is the cheapest month to book a flight from Philadelphia to Australia?

Currently, September is the cheapest month in which you can book a flight from Philadelphia to Australia (average of $237). Flying from Philadelphia to Australia in January is currently the most expensive (average of $1,392). 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.

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Australia. 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 from for flights from Philadelphia to Australia?

    Philadelphia (PHL) is the airport you will fly out of if you book a flight from Philadelphia to Australia. It is only a 11.2 km journey to Philadelphia (PHL) from Philadelphia’s city centre.

  • How long is the flight from Philadelphia to Australia?

    United Airlines, Qantas Airways, and American Airlines can get you from Philadelphia to Australia in just under 21h 23m. Your travel time can differ by up to 4h 44m. Philadelphia and Australia are separated by a distance of 15377 km. Both multi-stop and direct flights can be found to your destination and back.

  • What are the most popular routes from Philadelphia to Australia?

    The most popular route from Philadelphia to Australia is Philadelphia - Sydney Kingsford Smith. You may also consider Philadelphia - Melbourne or Philadelphia - Melbourne Avalon.

  • Can I find deals for flights from Philadelphia to Australia that include hotel bookings?

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

  • How can I find direct flights from Philadelphia to Australia?

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

  • Can I find deals for business class flights from Philadelphia to Australia?

    Yes. Cheapflights offers flight deals from Philadelphia to Australia 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 Philadelphia to Australia?

    Currently, September is the cheapest month in which you can book a flight from Philadelphia to Australia (average of $237). Flying from Philadelphia to Australia in January is currently the most expensive (average of $1,392). 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

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