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Cheap flights from Philadelphia to Australia from $741

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 7/2. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
27 Dec — 3 Jan1
1 adult
1 adult, Economy, 0 bags

Find 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 November 2025.

Wed 31/1208:15PHL - SYD
1 stop30h 05mUnited Airlines
Tue 20/114:00SYD - PHL
1 stop23h 52mUnited Airlines
Deal found 25/11$1,630
Wed 31/1218:25PHL - SYD
1 stop22h 50mUnited Airlines
Sun 18/111:20SYD - PHL
2 stops26h 16mUnited Airlines
Deal found 25/11$1,637
Wed 31/1206:17PHL - SYD
1 stop32h 03mUnited Airlines
Sat 17/114:00SYD - PHL
1 stop23h 52mUnited Airlines
Deal found 25/11$1,745
Wed 31/1213:47PHL - SYD
2 stops26h 43mDelta
Sat 17/114:15SYD - PHL
2 stops24h 58mDelta
Deal found 25/11$1,753
Mon 29/1217:50PHL - SYD
1 stop45h 10mUnited Airlines
Thu 15/111:50SYD - PHL
1 stop27h 09mUnited Airlines
Deal found 25/11$1,757
Thu 4/1205:30PHL - SYD
2 stops33h 55mMultiple Airlines
Mon 8/1211:20SYD - PHL
2 stops38h 27mMultiple Airlines
Deal found 25/11$1,816
Tue 30/1210:39PHL - SYD
2 stops27h 41mUnited Airlines
Sun 11/112:10SYD - PHL
2 stops39h 57mUnited Airlines
Deal found 26/11$1,857
Mon 29/1217:50PHL - SYD
1 stop45h 10mUnited Airlines
Sun 11/112:10SYD - PHL
2 stops39h 57mUnited Airlines
Deal found 26/11$1,870
Wed 31/1209:45PHL - SYD
2 stops31h 20mUnited Airlines
Fri 9/111:50SYD - PHL
1 stop27h 09mUnited Airlines
Deal found 26/11$1,937
Mon 29/1218:34PHL - SYD
2 stops44h 26mUnited Airlines
Fri 9/111:50SYD - PHL
1 stop20h 46mUnited Airlines
Deal found 26/11$1,945
Sat 29/1113:40PHL - MEL
2 stops33h 55mQantas Airways
Mon 8/1206:45MEL - PHL
2 stops26h 33mQantas Airways
Deal found 25/11$2,105
Sat 29/1117:12PHL - ADL
2 stops34h 08mQantas Airways
Sat 6/1208:45ADL - PHL
2 stops50h 53mQantas Airways
Deal found 26/11$2,252

Cheap 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 November 2025.

Round-trip from

$1,487

One-way from

$741

Popular in

December

Cheapest in

February

Average price

$1,936
Qantas Airways
  • Qantas Airways
  • 9/2-15/2
  • 3 total stops
  • 63h 54m total
  • Philadelphia to Australia
Search Deals
7/2
  • 7/2
  • 3 total stops
  • 39h 05m total
  • Philadelphia to Australia
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($610 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($115 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
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 November 2025.
Use the filters below to find and compare flights from Philadelphia to Australia that are best for you.

Fly from

Philadelphia

Fly to

Australia

Route

Depart

Return

Price

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Mon 16/2

14:14-17:10

2 stops35h 56m

Brisbane

Mon 2/3

19:40-06:55

1 stop26h 15m

$1,487

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 16/2

14:14-10:05

2 stops51h 51m

Sydney Kingsford Smith

Tue 24/2

17:45-23:41

1 stop21h 56m

$1,504

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 24/3

18:45-09:00

1 stop23h 15m

Sydney Kingsford Smith

Fri 10/4

12:00-18:51

1 stop20h 51m

$1,567

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 20/1

08:36-06:10

1 stop29h 34m

Sydney Kingsford Smith

Tue 10/2

11:20-20:16

1 stop24h 56m

$1,567

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 31/12

18:25-09:15

1 stop22h 50m

Sydney Kingsford Smith

Wed 14/1

14:00-21:52

1 stop23h 52m

$1,630

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 31/12

08:15-09:15

1 stop33h 00m

Sydney Kingsford Smith

Sun 18/1

14:00-21:52

1 stop23h 52m

$1,630

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 20/1

10:30-06:50

2 stops28h 20m

Sydney Kingsford Smith

Sun 8/2

10:40-20:40

2 stops26h 00m

$1,637

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 20/1

12:16-06:50

2 stops26h 34m

Sydney Kingsford Smith

Mon 9/2

10:40-23:53

2 stops29h 13m

$1,637

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 20/1

12:16-06:50

2 stops26h 34m

Sydney Kingsford Smith

Tue 10/2

14:15-23:13

2 stops24h 58m

$1,637

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 18/1

07:00-06:50

2 stops31h 50m

Sydney Kingsford Smith

Sun 8/2

10:40-20:40

2 stops26h 00m

$1,637

Flights are sorted by cheapest return flights first.

Deals found on 23/11

Showing 1-10 of 60 results
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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 $258). Flying from Philadelphia to Australia in July is currently the most expensive (average of $1,362). 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.

What is the cheapest time of day to fly from PHL to AU?

Find hourly flight availability from Philadelphia to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 27 November 2025.

It’s typically best to fly out from Philadelphia to Australia in the morning. Doing so could potentially save you 30% on the flight price compared to flying in the evening, which is usually more expensive.

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?

    Qantas Airways, United Airlines, and Air Canada can get you from Philadelphia to Australia in just under 22h 50m. Your travel time can differ by up to 13h 06m. 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 cheapest airlines to fly from Philadelphia to Australia one-way?

    The cheapest airline one-way is Qantas Airways, with whom users have recently found tickets for as low as $935. However, be on the lookout for offers from American Airlines and Etihad Airways, as they are both options that can get you from Philadelphia to Australia for a low price.

  • 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, September is the cheapest month in which you can book a flight from Philadelphia to Australia (average of $258). Flying from Philadelphia to Australia in July is currently the most expensive (average of $1,362). 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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Alternative routes for Philadelphia to Australia

See prices for flight routes from nearby airports that may be better suited for you.
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How does Cheapflights help users find flights from Philadelphia to Australia?

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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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