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Cheap flights from Philadelphia to Australia from $707

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 15/4. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
1 Apr — 8 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 2 March 2026.

Mon 2/1110:21
PHL
-
BNE
2 stops30h 59m
Delta
Wed 11/1110:40
BNE
-
PHL
2 stops28h 41m
Delta
Deal found 27/2$1,407
Wed 7/1014:12
PHL
-
SYD
2 stops26h 38m
Delta
Sun 18/1010:15
SYD
-
PHL
2 stops29h 06m
Delta
Deal found 26/2$1,413
Mon 17/816:05
PHL
-
MEL
2 stops25h 45m
Delta
Sun 23/810:00
MEL
-
PHL
2 stops29h 01m
Delta
Deal found 27/2$1,414
Tue 28/413:20
PHL
-
SYD
2 stops27h 30m
Delta
Mon 4/509:15
SYD
-
PHL
2 stops27h 35m
Delta
Deal found 27/2$1,414
Sun 8/1114:12
PHL
-
MEL
2 stops27h 38m
Delta
Wed 11/1112:00
MEL
-
PHL
2 stops26h 56m
Delta
Deal found 26/2$1,427
Wed 4/1114:12
PHL
-
SYD
2 stops26h 18m
Delta
Tue 10/1110:40
SYD
-
PHL
2 stops29h 41m
Delta
Deal found 26/2$1,427
Tue 3/1119:59
PHL
-
BNE
2 stops45h 21m
Delta
Wed 11/1110:40
BNE
-
PHL
2 stops22h 39m
Delta
Deal found 27/2$1,428
Sun 16/819:59
PHL
-
MEL
2 stops45h 51m
Delta
Wed 26/810:00
MEL
-
PHL
2 stops23h 22m
Delta
Deal found 27/2$1,435
Sat 10/1018:30
PHL
-
SYD
2 stops46h 20m
Delta
Sun 18/1010:15
SYD
-
PHL
2 stops28h 25m
Delta
Deal found 26/2$1,435
Sat 7/1117:15
PHL
-
MEL
2 stops48h 35m
Delta
Wed 11/1112:00
MEL
-
PHL
2 stops23h 24m
Delta
Deal found 26/2$1,448
Sat 7/1117:15
PHL
-
SYD
2 stops47h 15m
Delta
Wed 11/1110:40
SYD
-
PHL
2 stops23h 39m
Delta
Deal found 26/2$1,449
Tue 3/1117:07
PHL
-
BNE
1 stop22h 23m
American Airlines
Wed 11/1119:40
BNE
-
PHL
1 stop26h 44m
American Airlines
Deal found 27/2$1,467

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 2 March 2026.

Round-trip from

$1,414

One-way from

$707

Popular in

December

Cheapest in

April

Average price

$2,127
Delta
  • Delta
  • 17/8-26/8
  • 4 total stops
  • 53h 43m total
  • Philadelphia to Australia
Search Deals
15/4
  • 15/4
  • 3 total stops
  • 40h 45m total
  • Philadelphia to Australia
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($395 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($89 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 2 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

PhiladelphiaMelbourne

PHL - MEL

PHLMEL

Philadelphia

Wed 19/8

14:27-07:50

2 stops27h 23m

Melbourne

Fri 28/8

10:00-22:20

2 stops26h 20m

$1,484

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 22/8

08:00-06:50

2 stops32h 50m

Sydney Kingsford Smith

Wed 26/8

09:15-01:01

2 stops29h 46m

$1,497

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Thu 27/8

16:05-06:50

2 stops24h 45m

Sydney Kingsford Smith

Mon 31/8

09:15-01:01

2 stops53h 46m

$1,519

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 22/8

06:45-06:50

2 stops34h 05m

Sydney Kingsford Smith

Sat 29/8

09:15-01:01

2 stops29h 46m

$1,567

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Fri 13/3

08:46-06:20

1 stop30h 34m

Sydney Kingsford Smith

Sun 22/3

14:00-00:16

2 stops25h 16m

$1,600

PhiladelphiaMelbourne

PHL - MEL

PHLMEL

Philadelphia

Tue 14/4

06:00-06:45

2 stops34h 45m

Melbourne

Tue 21/4

09:45-12:15

2 stops40h 30m

$1,760

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Wed 1/4

16:27-09:10

2 stops26h 43m

Brisbane

Sun 12/4

19:00-20:34

2 stops39h 34m

$1,777

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Mon 30/3

19:00-11:15

2 stops26h 15m

Brisbane

Wed 8/4

20:35-05:52

1 stop23h 17m

$1,845

PhiladelphiaMelbourne

PHL - MEL

PHLMEL

Philadelphia

Wed 15/4

15:43-06:45

1 stop25h 02m

Melbourne

Wed 22/4

13:35-00:11

1 stop24h 36m

$1,885

PhiladelphiaMelbourne

PHL - MEL

PHLMEL

Philadelphia

Wed 15/4

14:15-06:45

1 stop26h 30m

Melbourne

Wed 22/4

13:35-22:38

2 stops23h 03m

$1,890

Flights are sorted by cheapest return flights first.

Deals found on 2/3

Showing 1-10 of 55 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 $233). Flying from Philadelphia to Australia in January is currently the most expensive (average of $1,373). 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?

    Delta, Qantas Airways, and United Airlines can get you from Philadelphia to Australia in just under 27h 23m. Your travel time can differ by up to 3h 11m. Philadelphia and Australia are separated by a distance of 16549 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 - Brisbane.

  • 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 $233). Flying from Philadelphia to Australia in January is currently the most expensive (average of $1,373). 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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Users can book flights with no change fees policies with our dedicated filters. Book flights from Philadelphia to Australia flexibly with Cheapflights today.

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