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Cheap flights from Philadelphia to Australia from $683

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 5/3. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
3 Jan — 10 Jan1
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 4 December 2025.

Tue 30/1214:02PHL - SYD
1 stop26h 58mAmerican Airlines
Mon 19/111:20SYD - PHL
1 stop28h 28mAmerican Airlines
Deal found 2/12$1,586
Sun 7/1213:15PHL - MEL
2 stops28h 45mUnited Airlines
Sun 14/1213:00MEL - PHL
1 stop22h 41mUnited Airlines
Deal found 2/12$1,735
Mon 29/1217:50PHL - SYD
1 stop45h 10mUnited Airlines
Thu 15/111:50SYD - PHL
1 stop20h 46mUnited Airlines
Deal found 2/12$1,738
Sat 6/1220:05PHL - SYD
2 stops42h 15mUnited Airlines
Wed 17/1212:10SYD - PHL
2 stops22h 58mUnited Airlines
Deal found 2/12$1,752
Thu 4/1207:50PHL - SYD
2 stops33h 45mAir Canada
Thu 11/1211:20SYD - PHL
2 stops43h 30mAir Canada
Deal found 3/12$1,856
Thu 4/1217:00PHL - SYD
1 stop24h 00mQantas Airways
Thu 11/1211:20SYD - PHL
1 stop21h 58mQantas Airways
Deal found 3/12$1,872
Thu 4/1215:40PHL - SYD
2 stops25h 20mAmerican Airlines
Thu 11/1211:20SYD - PHL
1 stop28h 29mAmerican Airlines
Deal found 3/12$1,878
Sun 7/1211:45PHL - MEL
1 stop25h 15mMultiple Airlines
Sun 14/1216:05MEL - PHL
1 stop22h 46mMultiple Airlines
Deal found 2/12$1,893
Wed 10/1206:55PHL - MEL
2 stops33h 05mDelta
Wed 4/310:10MEL - PHL
2 stops23h 46mDelta
Deal found 1/12$1,949
Sun 7/1210:27PHL - MEL
1 stop31h 03mAmerican Airlines
Sun 21/1212:00MEL - PHL
1 stop24h 00mAmerican Airlines
Deal found 1/12$2,010
Wed 31/1207:00PHL - MEL
2 stops33h 00mDelta
Wed 11/210:10MEL - PHL
2 stops23h 32mDelta
Deal found 3/12$2,011
Mon 29/1208:15PHL - ADL
1 stop33h 45mUnited Airlines
Wed 28/114:55ADL - PHL
1 stop22h 27mUnited Airlines
Deal found 3/12$2,066

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 4 December 2025.

Round-trip from

$1,471

One-way from

$683

Popular in

December

Cheapest in

February

Average price

$2,980
Qantas Airways
  • Qantas Airways
  • 17/1-24/1
  • 3 total stops
  • 67h 48m total
  • Philadelphia to Australia
Search Deals
5/3
  • 5/3
  • 3 total stops
  • 41h 33m total
  • Philadelphia to Australia
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($595 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($112 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 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 4 December 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

Sun 22/2

14:18-17:10

2 stops35h 52m

Brisbane

Sun 8/3

19:40-07:05

1 stop25h 25m

$1,471

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Fri 6/3

17:10-17:10

2 stops33h 00m

Brisbane

Mon 16/3

19:40-07:05

1 stop25h 25m

$1,484

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Sun 22/2

15:30-08:45

2 stops26h 15m

Brisbane

Sun 8/3

10:45-21:46

2 stops26h 01m

$1,524

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 24/1

14:30-09:10

2 stops50h 40m

Sydney Kingsford Smith

Mon 9/2

11:20-20:16

1 stop24h 56m

$1,528

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Mon 26/1

07:50-08:45

2 stops33h 55m

Brisbane

Tue 10/2

06:35-22:46

2 stops31h 11m

$1,565

PhiladelphiaBrisbane

PHL - BNE

PHLBNE

Philadelphia

Mon 26/1

16:35-08:45

2 stops25h 10m

Brisbane

Tue 10/2

06:35-15:24

3 stops47h 49m

$1,565

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 2/3

15:00-06:55

1 stop23h 55m

Sydney Kingsford Smith

Mon 16/3

11:20-20:00

1 stop23h 40m

$1,586

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 1/3

15:00-06:55

1 stop23h 55m

Sydney Kingsford Smith

Wed 18/3

11:20-20:00

1 stop23h 40m

$1,586

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 2/3

15:00-06:55

1 stop23h 55m

Sydney Kingsford Smith

Sun 15/3

17:45-23:50

1 stop21h 05m

$1,589

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 17/1

15:35-06:55

1 stop23h 20m

Sydney Kingsford Smith

Fri 30/1

11:20-20:16

1 stop24h 56m

$1,591

Flights are sorted by cheapest return flights first.

Deals found on 1/12

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 $255). Flying from Philadelphia to Australia in July is currently the most expensive (average of $1,345). 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 4 December 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.

Reviews of airlines servicing Australia

Get insights into the airlines that provide service to Australia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Australia. Reviews last updated 4 December 2025.
Check out reviews from past customers who have flown with United Airlines from Philadelphia to Australia to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,063 reviews
Check prices

Food

6.6

Crew

8.1

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
9,063 reviews
United Airlines
7.4
Good
9,063 reviews
Check prices

Food

6.6

Crew

8.1

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

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, Air Canada, and United Airlines can get you from Philadelphia to Australia in just under 24h 02m. Your travel time can differ by up to 11h 50m. Philadelphia and Australia are separated by a distance of 16549 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 - Adelaide.

  • 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 $255). Flying from Philadelphia to Australia in July is currently the most expensive (average of $1,345). 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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Top airline flying from Philadelphia to Australia

Discover the top airline that operate flights from Philadelphia to Australia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 4 December 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,304Average$1,362FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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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.

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