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$499+ Cheap flights from Philadelphia (PHL) to Sydney (SYD)

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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SYD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to Sydney Kingsford Smith are usually found in February or September, booked 27 days in advance, depart on a Sunday or Wednesday and return on a Monday

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 September 11, 2025.

Round-trip from

$1,177
(Alaska Airlines)

One-way from

$499
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$1,158
From Philadelphia to Sydney Kingsford Smith
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One-way flight from Philadelphia to Sydney Kingsford Smith
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Highest demand for flights based on searches. 16% potential increase in price ($290 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($50 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Philadelphia to Sydney

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 September 11, 2025.

This oojo deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/123:55 pmPHL - SYD
2 stops36h 00mMultiple Airlines
Tue 11/189:45 amSYD - PHL
2 stops27h 55mMultiple Airlines
Deal found 9/10$1,239
This Kiwi.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:10 pmPHL - SYD
2 stops54h 30mMultiple Airlines
Mon 9/225:45 pmSYD - PHL
1 stop26h 10mMultiple Airlines
Deal found 9/11$1,244
This oojo deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/410:27 amPHL - SYD
2 stops34h 03mFiji Airways
Thu 11/136:00 amSYD - PHL
2 stops31h 35mFiji Airways
Deal found 9/10$1,249
This oojo deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1110:27 amPHL - SYD
2 stops43h 23mFiji Airways
Tue 11/182:10 pmSYD - PHL
2 stops23h 30mFiji Airways
Deal found 9/11$1,251
This oojo deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/113:55 pmPHL - SYD
1 stop25h 05mQantas Airways
Tue 11/186:20 amSYD - PHL
2 stops30h 10mQantas Airways
Deal found 9/10$1,254
This oojo deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/261:40 pmPHL - SYD
2 stops33h 10mQantas Airways
Mon 12/152:05 pmSYD - PHL
1 stop22h 02mQantas Airways
Deal found 9/11$1,261
This oojo deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/103:55 pmPHL - SYD
1 stop25h 05mQantas Airways
Mon 11/175:50 pmSYD - PHL
2 stops36h 48mQantas Airways
Deal found 9/11$1,277
This oojo deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/245:20 pmPHL - SYD
2 stops37h 50mFiji Airways
Sat 11/152:30 pmSYD - PHL
2 stops23h 10mFiji Airways
Deal found 9/10$1,292
This Mytrip deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/216:19 amPHL - SYD
3 stops35h 41mMultiple Airlines
Thu 11/272:00 pmSYD - PHL
3 stops35h 45mMultiple Airlines
Deal found 9/11$1,297
This Ovago deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/306:44 pmPHL - SYD
2 stops27h 01mFiji Airways
Tue 10/282:15 pmSYD - PHL
2 stops23h 44mFiji Airways
Deal found 9/10$1,313

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated September 11, 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 11/10

3:55 pm-9:00 am

1 stop25h 05m

Sydney Kingsford Smith

Mon 11/17

5:50 pm-2:38 pm

2 stops36h 48m

$1,277

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 11/26

3:45 pm-9:50 pm

2 stops38h 05m

Sydney Kingsford Smith

Mon 12/15

2:00 pm-11:49 pm

2 stops25h 49m

$1,385

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 11/10

3:30 pm-9:35 am

3 stops50h 05m

Sydney Kingsford Smith

Mon 11/17

11:20 am-2:47 pm

2 stops43h 27m

$1,425

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 11/11

3:30 pm-9:35 am

2 stops26h 05m

Sydney Kingsford Smith

Tue 11/18

11:20 am-2:47 pm

3 stops43h 27m

$1,425

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 9/24

4:30 pm-11:45 am

2 stops29h 15m

Sydney Kingsford Smith

Sat 10/11

2:45 pm-1:09 am

2 stops25h 24m

$1,428

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 10/25

6:43 pm-12:45 pm

2 stops27h 02m

Sydney Kingsford Smith

Sun 11/2

2:00 pm-8:24 am

2 stops33h 24m

$1,443

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 10/21

6:43 pm-12:45 pm

2 stops27h 02m

Sydney Kingsford Smith

Thu 11/27

2:00 pm-3:43 pm

2 stops41h 43m

$1,460

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 12/3

6:15 am-10:30 am

2 stops36h 15m

Sydney Kingsford Smith

Wed 1/14

1:55 pm-12:07 pm

3 stops38h 12m

$1,467

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Wed 11/26

6:25 am-8:45 am

2 stops34h 20m

Sydney Kingsford Smith

Mon 12/15

1:55 pm-12:07 pm

3 stops38h 12m

$1,467

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 10/26

5:20 am-9:00 am

2 stops36h 40m

$567

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 18 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 round-trip 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 round-trip flight from Philadelphia to Sydney. Price data was last updated on August 29, 2025.

To ensure you get the cheapest price possible for a flight from Philadelphia to Sydney, you should look to book at least 27 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, February is the cheapest month in which you can book a flight from Philadelphia to Sydney (average of $1,035). Flying from Philadelphia to Sydney in December is currently the most expensive (average of $1,626). 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.

What is the cheapest time of day to fly from PHL to SYD?

Find hourly flight availability from Philadelphia to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

It’s typically best to fly out from Philadelphia to Sydney in the morning. Doing so could potentially save you 30% on the flight price compared to flying in the evening, which is usually more expensive.

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sydney. Reviews last updated September 11, 2025.
Peruse reviews from past customers who have flown with Fiji Airways, Qantas Airways, and United Airlines from Philadelphia to Sydney to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.5

Food

7.5

Entertainment

7.4

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!
Fiji Airways
8.0
Very good
205 reviews
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.5

Food

7.5

Entertainment

7.4

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!
Qantas Airways
7.5
Good
905 reviews
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.5

Food

7.5

Entertainment

7.4

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!
United Airlines
7.4
Good
8,937 reviews
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.5

Food

7.5

Entertainment

7.4

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!
American Airlines
7.2
Good
10,000 reviews
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.5

Food

7.5

Entertainment

7.4

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!
Air Canada
7.1
Good
10,000 reviews
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.5

Food

7.5

Entertainment

7.4

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!

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?

    Departing from Philadelphia to Sydney will take you 25h 05m. There are 9862 mi between Philadelphia and Sydney. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Philadelphia to Sydney round-trip?

    According to our current data, Delta ($833), United Airlines ($860), and Air Canada ($941) offers the cheapest pricing from Philadelphia to Sydney. Delta is priced at 44% lower than the current average price of a flight leaving 3 months from now.

  • 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 vacation 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, February is the cheapest month in which you can book a flight from Philadelphia to Sydney (average of $1,035). Flying from Philadelphia to Sydney in December is currently the most expensive (average of $1,626). 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

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Manly
Coogee

Browse thousands of different options on Cheapflights for your next trip

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Top 7 airlines flying from Philadelphia to Sydney

Discover the top 7 airlines that operate flights from Philadelphia to Sydney. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$833Average$879FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$860Average$906FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$941Average$1,304FlexibilityNo cancel feeOn-time67%
Air New ZealandCheapest$1,220Average$1,548FlexibilityNo cancel feeOn-time78%
Qantas AirwaysCheapest$1,294Average$1,983FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$1,351Average$1,795FlexibilityNo cancel feeOn-time71%
Fiji AirwaysCheapest$1,355Average$1,556FlexibilityNo cancel feeOn-time74%

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