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Cheap flights from Philadelphia to Australia from $869

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 20/8. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
5 Sep — 12 Sep1
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 6 August 2026.

Mon 14/906:00 -
3 stops39h 50m
Mon 21/913:15 -
3 stops34h 15m
Deal found 3/8$1,595
Tue 15/915:25 -
2 stops25h 40m
Tue 22/910:15 -
2 stops42h 32m
Deal found 4/8$1,668
Sun 1/1120:30 -
1 stop28h 30m
Fri 13/1122:00 -
1 stop32h 10m
Deal found 31/7$1,696
Sun 30/810:05 -
2 stops31h 15m
Tue 15/909:20 -
2 stops26h 12m
Deal found 1/8$1,702
Sun 30/821:30 -
2 stops31h 20m
Tue 15/914:50 -
1 stop37h 40m
Deal found 1/8$1,714
Sun 27/910:05 -
2 stops31h 00m
Sun 11/1019:40 -
3 stops41h 06m
Deal found 4/8$1,717
Sun 13/921:30 -
2 stops34h 55m
Sun 20/922:45 -
1 stop27h 45m
Deal found 5/8$1,719
Tue 18/815:25 -
2 stops25h 55m
Mon 7/909:20 -
2 stops43h 27m
Deal found 4/8$1,723
Mon 24/821:30 -
1 stop30h 00m
Fri 25/922:10 -
1 stop30h 20m
Deal found 5/8$1,726
Sat 31/1017:05 -
2 stops49h 30m
Mon 30/1111:20 -
2 stops43h 24m
Deal found 4/8$1,730
Sun 1/1120:30 -
1 stop28h 30m
Sat 14/1122:00 -
1 stop32h 10m
Deal found 31/7$1,733
Sun 25/1021:30 -
1 stop28h 30m
Sun 8/1122:00 -
1 stop32h 10m
Deal found 4/8$1,736

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 6 August 2026.

Round-trip from

$1,595

One-way from

$869

Popular in

December

Cheapest in

February

Average price

$2,195
14/9-21/9
  • 14/9-21/9
  • 6 total stops
  • 74h 05m total
  • Philadelphia to Australia
Search Deals
20/8
  • 20/8
  • 3 total stops
  • 57h 15m total
  • Philadelphia to Australia
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($290 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($50 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 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 6 August 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 Philadelphia - ADL Adelaide

PHLADL

Philadelphia

Thu 14/1

20:40-17:05

1 stop28h 55m

Adelaide

Fri 30/4

21:40-15:05

1 stop30h 55m

$1,699

PhiladelphiaBrisbane

PHL Philadelphia - BNE Brisbane

PHLBNE

Philadelphia

Wed 27/1

10:43-06:30

1 stop28h 47m

Brisbane

Thu 4/2

13:10-20:16

1 stop22h 06m

$1,757

PhiladelphiaBrisbane

PHL Philadelphia - BNE Brisbane

PHLBNE

Philadelphia

Tue 18/8

15:25-07:05

2 stops49h 40m

Brisbane

Tue 25/8

10:15-21:34

2 stops25h 19m

$1,773

PhiladelphiaAdelaide

PHL Philadelphia - ADL Adelaide

PHLADL

Philadelphia

Mon 2/11

20:30-16:30

1 stop28h 30m

Adelaide

Thu 12/11

08:40-14:40

2 stops45h 30m

$1,819

PhiladelphiaBrisbane

PHL Philadelphia - BNE Brisbane

PHLBNE

Philadelphia

Fri 29/1

18:51-07:30

3 stops69h 39m

Brisbane

Sun 7/2

11:40-21:20

1 stop24h 40m

$1,822

PhiladelphiaBrisbane

PHL Philadelphia - BNE Brisbane

PHLBNE

Philadelphia

Sat 12/9

10:05-07:05

2 stops31h 00m

Brisbane

Sun 20/9

10:00-14:47

2 stops42h 47m

$1,826

PhiladelphiaBrisbane

PHL Philadelphia - BNE Brisbane

PHLBNE

Philadelphia

Mon 24/8

21:30-17:30

1 stop30h 00m

Brisbane

Fri 25/9

06:35-14:30

2 stops45h 55m

$1,839

PhiladelphiaMelbourne

PHL Philadelphia - AVV Melbourne Avalon

PHLAVV

Philadelphia

Mon 2/11

09:15-23:15

3 stops46h 00m

Melbourne Avalon

Wed 11/11

06:00-16:21

3 stops50h 21m

$1,839

PhiladelphiaMelbourne

PHL Philadelphia - MEL Melbourne

PHLMEL

Philadelphia

Mon 26/10

21:30-23:20

1 stop34h 50m

Melbourne

Mon 2/11

18:20-14:40

2 stops36h 20m

$1,839

PhiladelphiaMelbourne

PHL Philadelphia - AVV Melbourne Avalon

PHLAVV

Philadelphia

Mon 26/10

09:15-23:15

3 stops47h 00m

Melbourne Avalon

Mon 2/11

06:00-16:21

3 stops50h 21m

$1,841

Flights are sorted by cheapest return flights first.

Deals found on 1/8

Showing 1-10 of 59 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, February is the cheapest month in which you can book a flight from Philadelphia to Australia (average of $1,550). Flying from Philadelphia to Australia in April is currently the most expensive (average of $2,572). 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 28h 47m. Your travel time can differ by up to 20h 53m. 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, February is the cheapest month in which you can book a flight from Philadelphia to Australia (average of $1,550). Flying from Philadelphia to Australia in April is currently the most expensive (average of $2,572). 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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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.

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