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Cheap flights from Philadelphia to Australia from $638

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 20/1. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
22 Nov — 29 Nov1
1 adult
1 adult, Economy

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 23 October 2025.

Tue 11/1108:15PHL - SYD
1 stop30h 45mUnited Airlines
Tue 18/1111:50SYD - PHL
1 stop20h 51mUnited Airlines
Deal found 22/10$1,280
Sat 25/1013:00PHL - SYD
1 stop27h 00mUnited Airlines
Sun 2/1111:50SYD - PHL
1 stop26h 56mUnited Airlines
Deal found 22/10$1,284
Mon 8/1215:05PHL - SYD
2 stops26h 00mUnited Airlines
Sun 21/1211:50SYD - PHL
2 stops28h 55mUnited Airlines
Deal found 22/10$1,286
Sat 22/1115:45PHL - SYD
1 stop25h 15mQantas Airways
Sun 7/1221:25SYD - PHL
1 stop26h 15mQantas Airways
Deal found 22/10$1,287
Fri 24/1018:29PHL - SYD
1 stop22h 26mUnited Airlines
Sat 15/1111:50SYD - PHL
1 stop20h 51mUnited Airlines
Deal found 22/10$1,289
Sat 22/1108:08PHL - SYD
2 stops32h 57mUnited Airlines
Sun 7/1214:00SYD - PHL
1 stop21h 41mUnited Airlines
Deal found 22/10$1,291
Sat 1/1119:00PHL - SYD
1 stop23h 00mQantas Airways
Sat 15/1117:45SYD - PHL
1 stop29h 39mQantas Airways
Deal found 22/10$1,292
Wed 26/1118:45PHL - SYD
1 stop22h 15mAmerican Airlines
Mon 15/1211:20SYD - PHL
1 stop28h 29mAmerican Airlines
Deal found 22/10$1,300
Mon 29/1217:50PHL - SYD
1 stop45h 10mUnited Airlines
Thu 15/111:20SYD - PHL
2 stops26h 31mUnited Airlines
Deal found 22/10$1,301
Mon 29/1215:41PHL - SYD
1 stop25h 19mQantas Airways
Thu 15/111:20SYD - PHL
1 stop24h 56mQantas Airways
Deal found 22/10$1,304
Wed 12/1115:55PHL - MCY
2 stops27h 35mQantas Airways
Tue 18/1106:00MCY - PHL
2 stops26h 18mQantas Airways
Deal found 22/10$1,572
Tue 11/1115:55PHL - MCY
2 stops27h 35mQantas Airways
Mon 17/1106:00MCY - PHL
2 stops26h 18mQantas Airways
Deal found 22/10$1,592

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 23 October 2025.

Round-trip from

$1,272

One-way from

$638

Popular in

December

Cheapest in

September

Average price

$2,233
Qantas Airways
  • Qantas Airways
  • 31/3-20/4
  • 2 total stops
  • 46h 31m total
  • Philadelphia to Australia
Search Deals
United Airlines
  • United Airlines
  • 20/1
  • 1 total stop
  • 32h 40m total
  • Philadelphia to Australia
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($724 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 October 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 23 October 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

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 23/2

12:44-07:00

1 stop26h 16m

Sydney Kingsford Smith

Tue 3/3

11:20-23:30

2 stops28h 10m

$1,280

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 11/11

08:15-09:15

2 stops33h 00m

Sydney Kingsford Smith

Tue 18/11

11:50-22:46

1 stop26h 56m

$1,280

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 31/3

18:16-07:55

1 stop22h 39m

Sydney Kingsford Smith

Mon 20/4

09:30-22:41

2 stops27h 11m

$1,280

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 21/3

12:45-07:00

1 stop27h 15m

Sydney Kingsford Smith

Wed 25/3

12:10-21:38

1 stop24h 28m

$1,284

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 17/11

15:48-09:05

2 stops25h 17m

Sydney Kingsford Smith

Mon 24/11

11:50-21:21

2 stops25h 31m

$1,286

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 16/2

08:35-09:05

2 stops32h 30m

Sydney Kingsford Smith

Tue 24/2

11:20-21:33

2 stops26h 13m

$1,286

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 31/1

19:45-09:05

2 stops45h 20m

Sydney Kingsford Smith

Sun 8/2

11:50-12:07

2 stops40h 17m

$1,286

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 8/12

13:15-09:05

3 stops27h 50m

Sydney Kingsford Smith

Sun 21/12

11:50-00:45

2 stops28h 55m

$1,286

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 11/2

08:35-09:05

2 stops32h 30m

Sydney Kingsford Smith

Sun 22/2

14:00-21:33

1 stop23h 33m

$1,286

PhiladelphiaMaroochydore

PHL - MCY

PHLMCY

Philadelphia

Wed 12/11

15:55-10:30

2 stops27h 35m

Maroochydore Sunshine Coast

Tue 18/11

06:00-17:18

2 stops26h 18m

$1,572

Flights are sorted by cheapest return flights first.

Deals found on 22/10

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 $259). Flying from Philadelphia to Australia in July is currently the most expensive (average of $1,364). 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 23 October 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?

    United Airlines, Qantas Airways, and Air Canada can get you from Philadelphia to Australia in just under 26h 15m. Your travel time can differ by up to 1h 20m. 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 cheapest airlines to fly from Philadelphia to Australia one-way?

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $638. However, be on the lookout for offers from Qantas Airways and American Airlines, 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 $259). Flying from Philadelphia to Australia in July is currently the most expensive (average of $1,364). 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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