Find flights
When to book
FAQs

Cheap flights from Philadelphia to Australia from $854

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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
31 May — 7 Jun1
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 1 May 2026.

Wed 1/705:15
PHL
-
SYD
2 stops35h 35m
Delta
Mon 13/709:15
SYD
-
PHL
2 stops34h 14m
Delta
Deal found 30/4$1,756
Sun 8/1119:50
PHL
-
SYD
1 stop31h 00m
Qatar Airways
Wed 18/1121:40
SYD
-
PHL
1 stop51h 20m
Qatar Airways
Deal found 30/4$1,778
Sun 8/1110:46
PHL
-
SYD
1 stop28h 09m
Qantas Airways
Wed 18/1106:00
SYD
-
PHL
2 stops24h 37m
Qantas Airways
Deal found 27/4$1,801
Wed 20/512:07
PHL
-
MEL
2 stops29h 43m
Delta
Wed 3/610:00
MEL
-
PHL
2 stops23h 27m
Delta
Deal found 29/4$1,812
Wed 27/514:23
PHL
-
SYD
2 stops26h 27m
Delta
Tue 9/609:15
SYD
-
PHL
2 stops26h 04m
Delta
Deal found 29/4$1,812
Fri 19/608:05
PHL
-
SYD
2 stops32h 45m
Delta
Wed 8/709:15
SYD
-
PHL
2 stops34h 14m
Delta
Deal found 29/4$1,826
Thu 5/1119:50
PHL
-
SYD
1 stop31h 00m
Qatar Airways
Sun 15/1121:40
SYD
-
PHL
1 stop51h 20m
Qatar Airways
Deal found 30/4$1,834
Tue 14/717:39
PHL
-
MEL
2 stops35h 41m
Multiple Airlines
Sat 25/707:30
MEL
-
PHL
2 stops29h 27m
Multiple Airlines
Deal found 29/4$1,837
Fri 25/916:05
PHL
-
SYD
2 stops24h 45m
Delta
Sun 4/1010:15
SYD
-
PHL
2 stops23h 12m
Delta
Deal found 29/4$1,840
Thu 3/1215:13
PHL
-
SYD
2 stops27h 42m
Qantas Airways
Sun 13/1221:25
SYD
-
PHL
1 stop24h 29m
Qantas Airways
Deal found 27/4$1,859
Sat 14/1115:55
PHL
-
BNE
1 stop22h 55m
Qantas Airways
Sat 5/1218:40
BNE
-
PHL
2 stops40h 28m
Qantas Airways
Deal found 26/4$1,865
Sun 1/1113:00
PHL
-
MEL
1 stop24h 00m
Qantas Airways
Sun 15/1106:00
MEL
-
PHL
2 stops24h 37m
Qantas Airways
Deal found 26/4$1,865

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 1 May 2026.

Round-trip from

$1,756

One-way from

$854

Popular in

December

Cheapest in

February

Average price

$2,030
Delta
  • Delta
  • 14/9-27/9
  • 4 total stops
  • 57h 53m total
  • Philadelphia to Australia
Search Deals
7/9
  • 7/9
  • 3 total stops
  • 51h 08m total
  • Philadelphia to Australia
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($386 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($94 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 1 May 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

PhiladelphiaMelbourne

PHL - MEL

PHLMEL

Philadelphia

Wed 20/5

12:07-07:50

2 stops29h 43m

Melbourne

Wed 3/6

10:00-19:27

2 stops23h 27m

$1,812

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 27/5

12:38-06:50

2 stops28h 12m

Sydney Kingsford Smith

Mon 8/6

09:15-06:08

2 stops34h 53m

$1,812

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Fri 25/9

16:05-06:50

2 stops24h 45m

Sydney Kingsford Smith

Sun 4/10

10:15-18:27

2 stops23h 12m

$1,840

PhiladelphiaMelbourne

PHL - MEL

PHLMEL

Philadelphia

Fri 15/5

07:25-07:50

2 stops34h 25m

Melbourne

Wed 27/5

10:00-23:07

2 stops27h 07m

$1,868

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Tue 19/5

15:42-05:00

1 stop23h 18m

Brisbane

Tue 2/6

20:35-07:00

1 stop24h 25m

$1,896
Fastest return journey

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

$1,896

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Wed 13/5

13:42-05:00

2 stops25h 18m

Brisbane

Sun 24/5

20:35-06:19

2 stops23h 44m

$1,956

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Tue 19/5

12:53-05:00

2 stops26h 07m

Brisbane

Tue 2/6

20:35-09:41

2 stops27h 06m

$1,956

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Wed 10/6

16:22-09:20

2 stops26h 58m

Brisbane

Wed 17/6

20:35-07:05

1 stop24h 30m

$1,964

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Tue 11/8

17:43-11:30

2 stops27h 47m

Brisbane

Mon 24/8

07:40-18:48

2 stops25h 08m

$2,042

Flights are sorted by cheapest return flights first.

Deals found on 26/4

Showing 1-10 of 56 resultsSorted by cheapest first
1
2
3
...
6

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

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

The best time to book flights from Philadelphia to Australia is 86 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 Philadelphia to Australia?

Currently, August is the cheapest month in which you can book a flight from Philadelphia to Australia (average of $349). Flying from Philadelphia to Australia in October is currently the most expensive (average of $1,489). 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 American Airlines can get you from Philadelphia to Australia in just under 23h 18m. Your travel time can differ by up to 4h 54m. 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 $349). Flying from Philadelphia to Australia in October is currently the most expensive (average of $1,489). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Philadelphia to Australia?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Philadelphia to Australia. 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 Philadelphia to Australia?

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.

Can Cheapflights notify me if prices for flights from Philadelphia to Australia become cheaper?

Not ready to book yet? You can track prices for flights from Philadelphia to Australia on Cheapflights with our Price Alert feature and get notified when better prices are available.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.