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Cheap flights from Philadelphia to Sydney from $738

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 14/4. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
16 Mar — 23 Mar1
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 14 February 2026.

Tue 3/314:16
PHL
-
SYD
1 stop26h 44m
Qantas Airways
Wed 11/317:50
SYD
-
PHL
2 stops35h 47m
Qantas Airways
Deal found 10/2$1,350
Mon 2/314:16
PHL
-
SYD
2 stops38h 34m
Qantas Airways
Tue 17/311:20
SYD
-
PHL
1 stop23h 22m
Qantas Airways
Deal found 10/2$1,376
Mon 2/314:16
PHL
-
SYD
2 stops38h 34m
Qantas Airways
Mon 16/311:20
SYD
-
PHL
1 stop23h 22m
Qantas Airways
Deal found 11/2$1,377
Sun 1/314:16
PHL
-
SYD
2 stops49h 19m
Qantas Airways
Fri 6/321:25
SYD
-
PHL
1 stop26h 37m
Qantas Airways
Deal found 10/2$1,387
Thu 19/214:16
PHL
-
SYD
2 stops38h 34m
Qantas Airways
Wed 1/410:10
SYD
-
PHL
1 stop34h 41m
Qantas Airways
Deal found 11/2$1,393
Sun 1/314:16
PHL
-
SYD
2 stops49h 19m
Qantas Airways
Tue 24/311:20
SYD
-
PHL
1 stop23h 22m
Qantas Airways
Deal found 11/2$1,429
Sun 1/314:16
PHL
-
SYD
1 stop26h 44m
Qantas Airways
Mon 16/311:20
SYD
-
PHL
1 stop23h 22m
Qantas Airways
Deal found 12/2$1,444
Sun 1/317:20
PHL
-
SYD
2 stops23h 40m
American Airlines
Mon 16/311:20
SYD
-
PHL
1 stop23h 22m
American Airlines
Deal found 12/2$1,475
Sun 1/314:16
PHL
-
SYD
1 stop26h 44m
Qantas Airways
Sun 8/311:20
SYD
-
PHL
1 stop23h 22m
Qantas Airways
Deal found 10/2$1,483
Sun 1/314:16
PHL
-
SYD
1 stop26h 44m
American Airlines
Sun 8/311:20
SYD
-
PHL
1 stop26h 39m
American Airlines
Deal found 11/2$1,487

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 14 February 2026.

Round-trip from

$1,350

One-way from

$738

Popular in

December

Cheapest in

April

Average price

$1,490
Qantas Airways
  • Qantas Airways
  • 3/3-11/3
  • 3 total stops
  • 62h 31m total
  • Philadelphia to Sydney
Search Deals
14/4
  • 14/4
  • 3 total stops
  • 37h 20m total
  • Philadelphia to Sydney
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($384 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($84 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
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 14 February 2026.
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 2/3

14:16-20:50

2 stops38h 34m

Sydney Kingsford Smith

Mon 16/3

11:20-19:42

1 stop23h 22m

$1,377

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 1/3

14:16-07:35

2 stops49h 19m

Sydney Kingsford Smith

Tue 24/3

11:20-19:42

1 stop23h 22m

$1,429

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 10/3

10:45-09:00

1 stop31h 15m

Sydney Kingsford Smith

Tue 17/3

11:20-20:00

2 stops23h 40m

$1,493

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 1/3

16:00-09:00

2 stops25h 00m

Sydney Kingsford Smith

Tue 24/3

11:20-20:00

2 stops23h 40m

$1,494

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 1/3

11:27-08:30

2 stops29h 03m

Sydney Kingsford Smith

Sun 8/3

10:40-19:52

2 stops25h 12m

$1,520

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 4/3

06:05-08:30

2 stops34h 25m

Sydney Kingsford Smith

Tue 17/3

13:15-23:00

2 stops24h 45m

$1,521

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 3/3

07:00-06:50

2 stops31h 50m

Sydney Kingsford Smith

Mon 16/3

13:15-00:57

2 stops26h 42m

$1,521

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 1/3

06:55-08:30

2 stops33h 35m

Sydney Kingsford Smith

Wed 18/3

09:40-17:28

2 stops22h 48m

$1,521

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 7/3

17:22-06:05

2 stops44h 43m

Sydney Kingsford Smith

Wed 18/3

09:40-17:28

2 stops22h 48m

$1,544

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 18/3

19:00-09:00

1 stop23h 00m

Sydney Kingsford Smith

Mon 27/4

09:10-18:54

1 stop23h 44m

$1,564

Flights are sorted by cheapest return flights first.

Deals found on 11/2

Showing 1-10 of 17 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 6 February 2026.

Booking 13 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 $530). Flying from Philadelphia to Sydney in January is currently the most expensive (average of $1,377). 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 31h 15m. Fly via Qantas Airways or American Airlines 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 $530). Flying from Philadelphia to Sydney in January is currently the most expensive (average of $1,377). 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
Penrith
Manly
Katoomba
Terrigal
Lithgow
Leura
Coogee
Cronulla
Randwick
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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