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Cheap flights from Philadelphia to Australia from $865

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 17/11. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
27 Jul — 3 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 27 June 2026.

Wed 11/1117:15
PHL
-
BNE
2 stops24h 05m
Delta
Wed 18/1110:40
BNE
-
PHL
2 stops28h 00m
Delta
Deal found 26/6$1,618
Wed 12/811:06
PHL
-
BNE
3 stops33h 29m
Multiple Airlines
Wed 26/811:35
BNE
-
PHL
3 stops38h 51m
Multiple Airlines
Deal found 26/6$1,677
Sun 9/811:06
PHL
-
SYD
3 stops34h 44m
Multiple Airlines
Tue 25/806:15
SYD
-
PHL
3 stops44h 11m
Multiple Airlines
Deal found 23/6$1,714
Thu 13/811:06
PHL
-
BNE
3 stops33h 34m
Multiple Airlines
Wed 26/811:35
BNE
-
PHL
3 stops38h 51m
Multiple Airlines
Deal found 22/6$1,731
Wed 11/1115:55
PHL
-
BNE
1 stop22h 55m
Qantas Airways
Wed 18/1113:10
BNE
-
PHL
1 stop21h 53m
Qantas Airways
Deal found 26/6$1,743
Mon 17/821:30
PHL
-
MEL
1 stop29h 20m
Qatar Airways
Wed 2/922:45
MEL
-
PHL
1 stop30h 20m
Qatar Airways
Deal found 24/6$1,751
Mon 2/1120:30
PHL
-
MEL
1 stop29h 20m
Qatar Airways
Wed 11/1123:40
MEL
-
PHL
1 stop31h 00m
Qatar Airways
Deal found 24/6$1,763
Thu 13/811:06
PHL
-
BNE
3 stops33h 34m
Multiple Airlines
Mon 24/811:55
BNE
-
PHL
3 stops38h 31m
Multiple Airlines
Deal found 23/6$1,782
Sun 8/1120:30
PHL
-
SYD
1 stop42h 20m
Qatar Airways
Wed 18/1115:50
SYD
-
PHL
1 stop38h 50m
Qatar Airways
Deal found 26/6$1,789
Wed 11/1120:30
PHL
-
SYD
1 stop30h 20m
Qatar Airways
Wed 18/1115:50
SYD
-
PHL
1 stop38h 50m
Qatar Airways
Deal found 26/6$1,805
Wed 11/1115:11
PHL
-
BNE
2 stops23h 39m
American Airlines
Wed 18/1113:10
BNE
-
PHL
1 stop21h 53m
American Airlines
Deal found 26/6$1,808
Wed 12/810:05
PHL
-
BNE
2 stops31h 00m
Air Canada
Wed 26/810:00
BNE
-
PHL
2 stops25h 34m
Air Canada
Deal found 25/6$1,811

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 27 June 2026.

Round-trip from

$1,618

One-way from

$865

Popular in

December

Cheapest in

February

Average price

$2,235
Delta
  • Delta
  • 11/11-18/11
  • 4 total stops
  • 52h 05m total
  • Philadelphia to Australia
Search Deals
17/11
  • 17/11
  • 3 total stops
  • 31h 52m total
  • Philadelphia to Australia
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($487 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($113 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 27 June 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

07:00-13:55

3 stops40h 25m

Adelaide

Tue 3/11

19:40-22:56

3 stops42h 46m

$1,899

PhiladelphiaAdelaide

PHL - ADL

PHLADL

Philadelphia

Tue 20/10

21:30-20:15

2 stops32h 15m

Adelaide

Tue 3/11

22:00-14:40

1 stop32h 10m

$1,921

PhiladelphiaMelbourne

PHL - MEL

PHLMEL

Philadelphia

Wed 28/10

21:30-17:50

1 stop29h 20m

Melbourne

Sun 1/11

23:40-14:40

1 stop31h 00m

$1,930

PhiladelphiaAdelaide

PHL - ADL

PHLADL

Philadelphia

Sat 8/8

21:30-21:10

2 stops34h 10m

Adelaide

Sat 15/8

22:00-15:05

1 stop30h 35m

$1,993
Fastest return journey

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Wed 12/8

18:36-06:30

1 stop21h 54m

Brisbane

Tue 25/8

10:30-19:15

1 stop22h 45m

$2,037

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Thu 13/8

13:06-11:05

2 stops31h 59m

Brisbane

Mon 24/8

12:20-22:31

2 stops24h 11m

$2,038

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Tue 3/11

18:51-07:30

3 stops45h 39m

Brisbane

Tue 8/12

11:40-09:24

2 stops36h 44m

$2,044

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Wed 12/8

18:36-06:30

1 stop21h 54m

Brisbane

Mon 24/8

06:55-20:55

2 stops28h 00m

$2,061

PhiladelphiaMelbourne

PHL - MEL

PHLMEL

Philadelphia

Wed 19/8

21:30-16:50

1 stop29h 20m

Melbourne

Sun 23/8

16:10-15:05

1 stop36h 55m

$2,069

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Thu 13/8

11:14-05:00

1 stop27h 46m

Brisbane

Mon 24/8

20:35-08:08

1 stop25h 33m

$2,093

Flights are sorted by cheapest return flights first.

Deals found on 23/6

Showing 1-10 of 60 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 $362). Flying from Philadelphia to Australia in July is currently the most expensive (average of $1,837). 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, United Airlines, and Air New Zealand can get you from Philadelphia to Australia in just under 21h 54m. Your travel time can differ by up to 10h 21m. 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, August is the cheapest month in which you can book a flight from Philadelphia to Australia (average of $362). Flying from Philadelphia to Australia in July is currently the most expensive (average of $1,837). 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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By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Australia from Philadelphia.

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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