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Cheap flights from Philadelphia to Sydney from $708

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
29 Dec — 5 Jan1
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 29 November 2025.

Round-trip from

$1,485

One-way from

$928

Popular in

December

Cheapest in

February

Average price

$1,926
Qantas Airways
  • Qantas Airways
  • 24/1-9/2
  • 3 total stops
  • 61h 48m total
  • Philadelphia to Sydney
Search Deals
22/1
  • 22/1
  • 3 total stops
  • 49h 46m total
  • Philadelphia to Sydney
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($605 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($114 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 29 November 2025.

Tue 9/1215:30PHL - SYD
2 stops26h 05mAir Canada
Sun 18/111:20SYD - PHL
2 stops27h 26mAir Canada
Deal found 27/11$1,603
Tue 30/1218:25PHL - SYD
1 stop22h 50mUnited Airlines
Mon 12/111:50SYD - PHL
1 stop27h 09mUnited Airlines
Deal found 28/11$1,623
Mon 29/1217:50PHL - SYD
1 stop45h 10mUnited Airlines
Mon 12/111:50SYD - PHL
1 stop27h 09mUnited Airlines
Deal found 28/11$1,635
Mon 29/1217:49PHL - SYD
2 stops45h 01mDelta
Mon 12/110:40SYD - PHL
2 stops29h 16mDelta
Deal found 28/11$1,655
Tue 9/1215:13PHL - SYD
3 stops34h 27mMultiple Airlines
Sun 18/111:45SYD - PHL
2 stops27h 14mMultiple Airlines
Deal found 27/11$1,667
Mon 1/1215:45PHL - SYD
1 stop25h 15mQantas Airways
Sun 7/1211:20SYD - PHL
1 stop28h 29mQantas Airways
Deal found 27/11$1,684
Sun 30/1108:30PHL - SYD
1 stop30h 25mAmerican Airlines
Sun 7/1211:20SYD - PHL
1 stop28h 29mAmerican Airlines
Deal found 29/11$1,733
Mon 1/1215:56PHL - SYD
2 stops25h 04mAmerican Airlines
Sun 7/1211:20SYD - PHL
2 stops22h 29mAmerican Airlines
Deal found 27/11$1,737

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 29 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

15:30-09:35

2 stops26h 05m

Sydney Kingsford Smith

Tue 24/2

11:20-15:24

1 stop44h 04m

$1,514

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 31/3

15:30-08:20

3 stops49h 50m

Sydney Kingsford Smith

Mon 20/4

09:20-14:46

2 stops43h 26m

$1,516

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 24/1

15:35-06:55

1 stop23h 20m

Sydney Kingsford Smith

Mon 9/2

14:05-19:06

1 stop21h 01m

$1,560

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 15/3

18:59-09:00

1 stop23h 01m

Sydney Kingsford Smith

Wed 25/3

17:45-23:50

1 stop21h 05m

$1,560

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 17/5

09:15-07:20

2 stops32h 05m

Sydney Kingsford Smith

Sun 24/5

09:20-21:37

2 stops26h 17m

$1,601

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 31/3

17:17-06:55

1 stop22h 38m

Sydney Kingsford Smith

Mon 20/4

09:10-17:55

1 stop22h 45m

$1,615

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 30/12

18:25-09:15

1 stop22h 50m

Sydney Kingsford Smith

Mon 12/1

11:50-22:59

1 stop27h 09m

$1,623

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Thu 22/1

12:24-06:10

3 stops49h 46m

$928

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Fri 6/2

14:30-09:00

1 stop26h 30m

$930

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 7/2

05:30-07:25

2 stops33h 55m

$942

Flights are sorted by cheapest return flights first.

Deals found on 28/11

Showing 1-10 of 16 results
1
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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 21 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 $616). Flying from Philadelphia to Sydney in January is currently the most expensive (average of $1,451). 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 23h 01m. Fly via Air Canada or Qantas Airways 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 $616). Flying from Philadelphia to Sydney in January is currently the most expensive (average of $1,451). 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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Can Cheapflights find flights from Philadelphia to Sydney with no change fees?

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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Of course! You can now track prices for flights from Philadelphia to Sydney and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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