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Cheap flights from Philadelphia to Sydney from $928

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 21/1. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
14 Dec — 21 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Philadelphia to Sydney Kingsford Smith are usually found in February or September, booked 42 days in advance, depart on a Tuesday or Thursday and return on a Thursday

Cheap flight deals from Philadelphia to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 14 November 2025.

Round-trip from

$1,482

One-way from

$928

Popular in

December

Cheapest in

February

Average price

$1,921
Qantas Airways
  • Qantas Airways
  • 31/3-20/4
  • 2 total stops
  • 46h 20m total
  • Philadelphia to Sydney
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Qantas Airways
  • Qantas Airways
  • 21/1
  • 1 total stop
  • 26h 30m total
  • Philadelphia to Sydney
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($617 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease ($117 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Find flight deals from Philadelphia to Sydney

Enter your travel dates to find the best prices.

Cheapest flights from Philadelphia to Sydney
Explore the most affordable flight options available from Philadelphia to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 November 2025.

Tue 2/1215:45PHL - SYD
1 stop25h 15mQantas Airways
Sat 6/1217:50SYD - PHL
2 stops36h 47mQantas Airways
Deal found 12/11$1,483
Wed 10/1216:03PHL - SYD
2 stops47h 32mQantas Airways
Mon 15/1211:20SYD - PHL
1 stop21h 58mQantas Airways
Deal found 11/11$1,529
Wed 26/1115:45PHL - SYD
1 stop25h 15mQantas Airways
Mon 15/1214:05SYD - PHL
1 stop23h 32mQantas Airways
Deal found 12/11$1,556
Tue 25/1118:45PHL - SYD
1 stop22h 15mAmerican Airlines
Wed 3/1211:20SYD - PHL
1 stop24h 45mAmerican Airlines
Deal found 11/11$1,593
Wed 26/1117:10PHL - SYD
2 stops23h 50mAmerican Airlines
Mon 15/1211:20SYD - PHL
2 stops22h 35mAmerican Airlines
Deal found 12/11$1,601
Wed 3/1213:15PHL - SYD
3 stops27h 50mUnited Airlines
Sun 21/1211:20SYD - PHL
2 stops29h 25mUnited Airlines
Deal found 10/11$1,625
Tue 9/1212:22PHL - SYD
2 stops28h 08mDelta
Tue 16/1210:40SYD - PHL
2 stops30h 11mDelta
Deal found 12/11$1,627
Sat 6/1215:13PHL - SYD
1 stop25h 47mQantas Airways
Fri 12/1217:45SYD - PHL
1 stop22h 04mQantas Airways
Deal found 12/11$1,642
Sat 6/1220:05PHL - SYD
2 stops42h 15mUnited Airlines
Tue 16/1211:20SYD - PHL
2 stops25h 50mUnited Airlines
Deal found 12/11$1,651

Cheapflights Fare Finder

 
Customise your flight search to find flights from Philadelphia to Sydney 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 14 November 2025.
Use the filters below to find and compare flights from Philadelphia to Sydney that are best for you.

Fly from

Philadelphia

Fly to

Sydney

Route

Depart

Return

Price

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 16/2

14:14-09:00

1 stop26h 46m

Sydney Kingsford Smith

Tue 24/2

14:05-20:35

1 stop22h 30m

$1,595

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 26/11

15:45-09:00

1 stop25h 15m

Sydney Kingsford Smith

Mon 15/12

14:05-20:07

1 stop22h 02m

$1,595

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 9/12

10:45-06:55

1 stop28h 10m

Sydney Kingsford Smith

Tue 16/12

11:20-17:18

1 stop21h 58m

$1,595

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 31/3

17:19-08:05

1 stop23h 46m

Sydney Kingsford Smith

Mon 20/4

12:10-23:01

1 stop24h 51m

$1,604

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 9/12

12:22-08:30

2 stops28h 08m

Sydney Kingsford Smith

Tue 16/12

10:40-00:51

2 stops30h 11m

$1,627

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Fri 27/2

14:14-09:00

1 stop26h 46m

Sydney Kingsford Smith

Sun 8/3

13:05-18:24

1 stop21h 19m

$1,674

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Thu 26/2

14:14-09:00

1 stop26h 46m

Sydney Kingsford Smith

Mon 9/3

13:05-19:24

1 stop21h 19m

$1,674

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 6/12

15:13-09:00

1 stop25h 47m

Sydney Kingsford Smith

Thu 11/12

11:20-23:49

1 stop28h 29m

$1,674

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 25/2

14:14-09:00

1 stop26h 46m

Sydney Kingsford Smith

Wed 11/3

13:05-19:24

1 stop21h 19m

$1,674

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Fri 27/2

14:14-09:00

1 stop26h 46m

Sydney Kingsford Smith

Wed 11/3

17:45-23:49

1 stop21h 04m

$1,674

Flights are sorted by cheapest return flights first.

Deals found on 11/11

Showing 1-10 of 18 results
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Best time to book a flight from Philadelphia to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney 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 Sydney

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

Use this chart to determine the optimal time to book a return flight from Philadelphia to Sydney. Price data was last updated on 7 November 2025.

Booking 27 days in advance of your planned departure date is, on average, the best time to get cheap flights from Philadelphia to Sydney. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Philadelphia to Sydney?

Currently, August is the cheapest month in which you can book a flight from Philadelphia to Sydney (average of $615). Flying from Philadelphia to Sydney in January is currently the most expensive (average of $1,448). 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 Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Philadelphia to Sydney?

    There are many flights that can get you from Philadelphia to Sydney in 26h 46m. Fly via Qantas Airways or Delta to get the fastest option. The distance between Philadelphia and Sydney is about 15871 km. Both multi-stop and direct flights can be found to your destination and back.

  • Can I find deals for flights from Philadelphia to Sydney that include hotel bookings?

    Yes. In addition to deals on Philadelphia to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to Sydney.

  • Can I find deals for business class flights from Philadelphia to Sydney?

    Yes. Cheapflights offers flight deals from Philadelphia to Sydney 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 Sydney?

    Currently, August is the cheapest month in which you can book a flight from Philadelphia to Sydney (average of $615). Flying from Philadelphia to Sydney in January is currently the most expensive (average of $1,448). 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

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Katoomba
Penrith
Terrigal
Manly
Randwick
Lithgow
Coogee
Leura
Bondi Beach
Cronulla

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Why should you use Cheapflights to find cheap flight tickets from Philadelphia to Sydney?

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Yes, we can. To see specific flights from Philadelphia to Sydney with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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