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Cheap flights from Philadelphia to Sydney from $818

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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
29 Jan — 5 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap 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 30 December 2025.

Mon 29/1214:30PHL - SYD
2 stops29h 25mQantas Airways
Thu 15/114:35SYD - PHL
2 stops39h 58mQantas Airways
Deal found 28/12$2,054
Mon 29/1217:20PHL - SYD
2 stops35h 30mMultiple Airlines
Thu 15/122:20SYD - PHL
2 stops38h 03mMultiple Airlines
Deal found 29/12$3,072
Mon 29/1206:35PHL - SYD
3 stops35h 00mAir Canada
Thu 15/116:00SYD - PHL
2 stops62h 47mAir Canada
Deal found 28/12$3,779
Mon 29/1217:05PHL - SYD
2 stops46h 30mQantas Airways
Mon 5/119:15SYD - PHL
2 stops41h 01mQantas Airways
Deal found 28/12$3,800
Mon 29/1215:30PHL - SYD
2 stops26h 05mAir Canada
Sat 3/116:00SYD - PHL
2 stops39h 51mAir Canada
Deal found 28/12$4,450
Mon 29/1215:30PHL - SYD
2 stops26h 05mAir Canada
Mon 5/111:20SYD - PHL
3 stops43h 27mAir Canada
Deal found 28/12$4,602
Mon 29/1206:51PHL - SYD
1 stop32h 09mUnited Airlines
Mon 5/112:10SYD - PHL
1 stop21h 12mUnited Airlines
Deal found 28/12$4,720
Mon 29/1208:15PHL - SYD
1 stop30h 05mUnited Airlines
Thu 15/111:50SYD - PHL
1 stop20h 46mUnited Airlines
Deal found 29/12$4,795

Find 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 30 December 2025.

Round-trip from

$1,404

One-way from

$818

Popular in

December

Cheapest in

February

Average price

$2,878
Qantas Airways
  • Qantas Airways
  • 24/1-9/2
  • 3 total stops
  • 86h 21m total
  • Philadelphia to Sydney
Search Deals
7/4
  • 7/4
  • 2 total stops
  • 36h 00m total
  • Philadelphia to Sydney
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($440 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($103 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 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 30 December 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

Fri 30/1

17:39-06:55

1 stop45h 16m

Sydney Kingsford Smith

Fri 27/2

11:20-06:55

1 stop35h 35m

$1,544

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Thu 29/1

14:30-07:25

1 stop24h 55m

Sydney Kingsford Smith

Thu 5/2

11:20-07:01

1 stop35h 41m

$1,544

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 24/3

15:44-06:10

1 stop23h 26m

Sydney Kingsford Smith

Fri 10/4

09:10-18:54

1 stop23h 44m

$1,544

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 7/3

14:23-09:00

1 stop26h 37m

Sydney Kingsford Smith

Sat 14/3

17:45-23:50

1 stop21h 05m

$1,544

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 19/1

06:15-08:30

2 stops34h 15m

Sydney Kingsford Smith

Wed 11/2

10:40-17:57

2 stops23h 17m

$1,595

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 27/1

12:29-06:50

2 stops26h 21m

Sydney Kingsford Smith

Tue 3/2

14:15-00:21

2 stops26h 06m

$1,595

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 2/3

18:40-06:55

1 stop44h 15m

Sydney Kingsford Smith

Mon 16/3

11:20-20:00

1 stop23h 40m

$1,605

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 3/2

14:30-09:00

1 stop26h 30m

Sydney Kingsford Smith

Sun 15/2

11:20-23:50

1 stop28h 30m

$1,639

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 2/2

14:30-07:25

1 stop24h 55m

Sydney Kingsford Smith

Fri 13/2

11:20-23:50

1 stop28h 30m

$1,639

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 1/3

17:10-14:25

2 stops29h 15m

Sydney Kingsford Smith

Tue 24/3

11:20-20:00

1 stop23h 40m

$1,692

Flights are sorted by cheapest return flights first.

Deals found on 28/12

Showing 1-10 of 20 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 26 December 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 $643). Flying from Philadelphia to Sydney in January is currently the most expensive (average of $1,416). 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 34h 15m. 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 $643). Flying from Philadelphia to Sydney in January is currently the most expensive (average of $1,416). 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
Lithgow
Randwick
Coogee
Leura
Cronulla
Bondi Beach

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How does Cheapflights help users find flights from Philadelphia to Sydney?

Deals for Philadelphia to Sydney flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights simply makes it quick and affordable to book flights from Philadelphia to Sydney by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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.

Can Cheapflights notify me if prices for flights from Philadelphia to Sydney become cheaper?

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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