Find flights
When to book
FAQs

Cheap flights from Philadelphia to Sydney from $781

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 29/4. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
27 Mar — 3 Apr1
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 25 February 2026.

Wed 6/512:29
PHL
-
SYD
2 stops28h 21m
Delta
Wed 20/509:15
SYD
-
PHL
2 stops26h 57m
Delta
Deal found 23/2$1,438
Mon 9/314:18
PHL
-
SYD
1 stop27h 42m
Qantas Airways
Mon 23/311:20
SYD
-
PHL
1 stop23h 22m
Qantas Airways
Deal found 21/2$1,475
Mon 9/317:17
PHL
-
SYD
2 stops24h 43m
American Airlines
Mon 23/311:20
SYD
-
PHL
2 stops23h 28m
American Airlines
Deal found 22/2$1,479
Tue 17/312:26
PHL
-
SYD
2 stops26h 39m
Delta
Tue 24/313:15
SYD
-
PHL
2 stops26h 42m
Delta
Deal found 24/2$1,480
Sun 8/319:00
PHL
-
SYD
1 stop23h 00m
Qantas Airways
Wed 18/311:20
SYD
-
PHL
1 stop23h 22m
Qantas Airways
Deal found 21/2$1,487
Tue 17/309:28
PHL
-
SYD
1 stop32h 32m
American Airlines
Tue 24/311:20
SYD
-
PHL
1 stop23h 22m
American Airlines
Deal found 24/2$1,490
Sat 9/512:36
PHL
-
SYD
2 stops28h 14m
Delta
Wed 20/509:15
SYD
-
PHL
2 stops25h 34m
Delta
Deal found 24/2$1,495
Sun 8/317:17
PHL
-
SYD
2 stops24h 43m
American Airlines
Wed 18/311:20
SYD
-
PHL
2 stops23h 26m
American Airlines
Deal found 21/2$1,497
Thu 10/1207:05
PHL
-
SYD
2 stops33h 25m
Delta
Sun 20/1210:40
SYD
-
PHL
2 stops29h 41m
Delta
Deal found 24/2$1,509
Sun 29/314:18
PHL
-
SYD
1 stop26h 47m
Qantas Airways
Sun 12/409:10
SYD
-
PHL
1 stop34h 42m
Qantas Airways
Deal found 22/2$1,512
Sun 8/312:45
PHL
-
SYD
1 stop27h 15m
United Airlines
Wed 18/311:50
SYD
-
PHL
1 stop21h 03m
United Airlines
Deal found 22/2$1,516

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 25 February 2026.

Round-trip from

$1,438

One-way from

$781

Popular in

December

Cheapest in

April

Average price

$1,517
Delta
  • Delta
  • 3/8-24/8
  • 4 total stops
  • 52h 48m total
  • Philadelphia to Sydney
Search Deals
29/4
  • 29/4
  • 2 total stops
  • 35h 25m total
  • Philadelphia to Sydney
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($410 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($94 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 25 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

Sun 8/3

12:45-07:00

1 stop27h 15m

Sydney Kingsford Smith

Wed 18/3

11:50-17:53

1 stop21h 03m

$1,516

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Fri 19/6

16:14-07:00

2 stops24h 46m

Sydney Kingsford Smith

Fri 3/7

10:20-10:26

2 stops38h 06m

$1,520

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 24/3

06:54-06:05

2 stops32h 11m

Sydney Kingsford Smith

Fri 10/4

09:15-23:00

2 stops27h 45m

$1,551

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 27/6

05:30-06:50

2 stops35h 20m

Sydney Kingsford Smith

Fri 10/7

09:15-06:05

2 stops34h 50m

$1,580

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Fri 20/3

19:45-06:20

2 stops67h 35m

Sydney Kingsford Smith

Fri 27/3

14:00-21:31

1 stop22h 31m

$1,653

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Fri 3/4

06:05-07:50

2 stops34h 45m

Sydney Kingsford Smith

Thu 9/4

09:15-23:11

2 stops27h 56m

$1,886

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 11/4

06:54-06:50

2 stops33h 56m

$895

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Fri 20/3

20:25-07:25

2 stops44h 00m

$900

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 3/3

14:08-10:05

3 stops51h 57m

$982

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Fri 20/3

15:44-06:10

1 stop23h 26m

$1,038

Flights are sorted by cheapest return flights first.

Deals found on 24/2

Showing 1-10 of 12 results
1
2

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 20 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 $531). Flying from Philadelphia to Sydney in January is currently the most expensive (average of $1,381). 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 27h 29m. Fly via Delta or United 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 $531). Flying from Philadelphia to Sydney in January is currently the most expensive (average of $1,381). 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
Katoomba
Manly
Terrigal
Lithgow
Bondi Beach
Leura
Coogee
Cronulla
Randwick

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.