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Cheap flights from Philadelphia to Australia from $850

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 6/8. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
9 Aug — 16 Aug1
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 10 July 2026.

Tue 20/1021:30
PHL
-
ADL
1 stop28h 00m
Qatar Airways
Tue 3/1122:00
ADL
-
PHL
1 stop32h 10m
Qatar Airways
Deal found 8/7$1,693
Sat 22/817:48
PHL
-
MEL
2 stops35h 32m
Multiple Airlines
Sat 29/807:30
MEL
-
PHL
2 stops29h 21m
Multiple Airlines
Deal found 10/7$1,704
Tue 20/1021:30
PHL
-
ADL
1 stop28h 00m
Multiple Airlines
Tue 3/1117:50
ADL
-
PHL
2 stops36h 20m
Multiple Airlines
Deal found 8/7$1,725
Wed 4/1120:30
PHL
-
MEL
1 stop34h 50m
Qatar Airways
Wed 18/1123:40
MEL
-
PHL
1 stop31h 00m
Qatar Airways
Deal found 7/7$1,735
Mon 2/1120:30
PHL
-
MEL
1 stop29h 20m
Qatar Airways
Wed 11/1123:40
MEL
-
PHL
1 stop31h 00m
Qatar Airways
Deal found 8/7$1,748
Wed 18/1120:30
PHL
-
MEL
1 stop34h 50m
Qatar Airways
Mon 23/1123:40
MEL
-
PHL
1 stop31h 00m
Qatar Airways
Deal found 6/7$1,752
Sun 8/1120:30
PHL
-
SYD
1 stop42h 20m
Qatar Airways
Wed 18/1115:50
SYD
-
PHL
1 stop38h 50m
Qatar Airways
Deal found 9/7$1,785
Wed 12/810:05
PHL
-
BNE
2 stops31h 00m
Air Canada
Tue 25/810:15
BNE
-
PHL
2 stops42h 34m
Air Canada
Deal found 10/7$1,796
Thu 20/817:48
PHL
-
MEL
2 stops35h 32m
Multiple Airlines
Sat 5/907:30
MEL
-
PHL
2 stops29h 21m
Multiple Airlines
Deal found 8/7$1,802
Tue 28/710:05
PHL
-
BNE
2 stops31h 00m
Air Canada
Tue 4/810:15
BNE
-
PHL
2 stops49h 19m
Air Canada
Deal found 8/7$1,811
Wed 28/1021:30
PHL
-
MEL
1 stop29h 20m
Qatar Airways
Sun 1/1123:40
MEL
-
PHL
1 stop31h 00m
Qatar Airways
Deal found 7/7$1,820
Sun 8/1116:05
PHL
-
SYD
1 stop22h 20m
Qantas Airways
Wed 18/1110:20
SYD
-
PHL
2 stops25h 43m
Qantas Airways
Deal found 6/7$1,832

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 10 July 2026.

Round-trip from

$1,693

One-way from

$850

Popular in

December

Cheapest in

February

Average price

$2,307
Qatar Airways
  • Qatar Airways
  • 20/10-3/11
  • 2 total stops
  • 60h 10m total
  • Philadelphia to Australia
Search Deals
6/8
  • 6/8
  • 3 total stops
  • 50h 01m total
  • Philadelphia to Australia
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($440 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($106 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 10 July 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

PhiladelphiaAdelaide

PHL - ADL

PHLADL

Philadelphia

Tue 20/10

21:30-16:00

1 stop28h 00m

Adelaide

Tue 3/11

22:00-14:40

1 stop32h 10m

$1,726
Fastest return journey

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 8/11

16:05-06:25

1 stop22h 20m

Sydney Kingsford Smith

Wed 18/11

10:20-20:03

2 stops25h 43m

$1,832

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 8/11

16:05-06:25

1 stop22h 20m

Sydney Kingsford Smith

Wed 18/11

10:20-20:03

2 stops25h 43m

$1,834

PhiladelphiaMelbourne

PHL - AVV

PHLAVV

Philadelphia

Mon 2/11

09:15-23:15

3 stops46h 00m

Melbourne Avalon

Wed 11/11

06:00-16:21

3 stops50h 21m

$1,848

PhiladelphiaMelbourne

PHL - AVV

PHLAVV

Philadelphia

Wed 21/10

10:50-16:05

3 stops38h 15m

Melbourne Avalon

Sun 25/10

06:00-22:56

3 stops31h 56m

$1,848

PhiladelphiaMelbourne

PHL - AVV

PHLAVV

Philadelphia

Wed 4/11

09:15-20:20

3 stops43h 05m

Melbourne Avalon

Wed 18/11

06:00-22:56

3 stops32h 56m

$1,848

PhiladelphiaMelbourne

PHL - AVV

PHLAVV

Philadelphia

Wed 18/11

09:15-23:15

3 stops46h 00m

Melbourne Avalon

Mon 23/11

20:55-22:56

3 stops42h 01m

$1,851

PhiladelphiaMelbourne

PHL - MEL

PHLMEL

Philadelphia

Mon 2/11

20:30-21:40

2 stops33h 10m

Melbourne

Wed 11/11

23:40-14:40

1 stop31h 00m

$1,868

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 14/9

21:30-18:50

2 stops31h 20m

Sydney Kingsford Smith

Sun 27/9

20:45-14:30

1 stop31h 45m

$1,877

PhiladelphiaAdelaide

PHL - ADL

PHLADL

Philadelphia

Tue 20/10

07:00-13:55

3 stops40h 25m

Adelaide

Tue 3/11

19:40-22:56

3 stops42h 46m

$1,886

Flights are sorted by cheapest return flights first.

Deals found on 6/7

Showing 1-10 of 54 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, August is the cheapest month in which you can book a flight from Philadelphia to Australia (average of $360). Flying from Philadelphia to Australia in June is currently the most expensive (average of $1,877). 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.

How far ahead should I book a flight from Philadelphia to Australia?

The best time to book flights from Philadelphia to Australia is 38 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.

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?

    Qatar Airways, Qantas Airways, and Air Canada can get you from Philadelphia to Australia in just under 22h 20m. Your travel time can differ by up to 29h 05m. Philadelphia and Australia are separated by a distance of 15871 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, August is the cheapest month in which you can book a flight from Philadelphia to Australia (average of $360). Flying from Philadelphia to Australia in June is currently the most expensive (average of $1,877). 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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Can Cheapflights find flights from Philadelphia to Australia with no change fees?

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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