What is the cheapest airline that flies from Philadelphia to Sydney Kingsford Smith?

Qantas Airways is the most popular carrier operating from Philadelphia to Sydney Kingsford Smith

Which airlines fly to Sydney?

Qantas Airways, Air Canada and United Airlines are the top three most popular airlines that fly to Sydney from Philadelphia according to our data. Qantas Airways is the first choice among our users, with 46% of people opting to fly with this airline when travelling to Sydney. Keep in mind that there are 3 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Philadelphia Airport to Sydney Kingsford Smith Airport?

Prices for flights from Philadelphia Airport to Sydney Kingsford Smith Airport are updated daily.

How old do you have to be to fly from Philadelphia Airport to Sydney Kingsford Smith Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to Sydney Kingsford Smith Airport.

What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

The necessary travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$818 Cheap Flights from Philadelphia to Sydney in 2025/26

1 adult

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Find the cheapest flights from Philadelphia to Sydney

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17:39 - 17:40

PHL

SYD

32h 01m2 stops

11:20 - 19:48

SYD

PHL

24h 28m1 stop

$1,402Qantas Airways

Sun, 8 Feb - Sat, 14 Feb

14:30 - 09:10

PHL

SYD

50h 40m2 stops

11:20 - 07:01

SYD

PHL

35h 41m1 stop

$1,404Qantas Airways

Sat, 24 Jan - Mon, 9 Feb

14:16 - 10:05

PHL

SYD

51h 49m2 stops

21:25 - 08:08

SYD

PHL

26h 43m1 stop

$1,414Qantas Airways

Mon, 16 Feb - Tue, 24 Feb

14:30 - 09:10

PHL

SYD

50h 40m2 stops

11:20 - 07:01

SYD

PHL

35h 41m1 stop

$1,504Qantas Airways

Mon, 19 Jan - Wed, 11 Feb

08:15 - 06:10

PHL

SYD

29h 55m1 stop

19:15 - 19:48

SYD

PHL

40h 33m2 stops

$1,513Qantas Airways

Sun, 15 Feb - Wed, 25 Feb

14:30 - 09:10

PHL

SYD

50h 40m2 stops

11:20 - 19:48

SYD

PHL

24h 28m1 stop

$1,525Qantas Airways

Mon, 9 Feb - Sat, 14 Feb

15:44 - 06:10

PHL

SYD

23h 26m1 stop

09:10 - 18:54

SYD

PHL

23h 44m1 stop

$1,544Qantas Airways

Tue, 24 Mar - Fri, 10 Apr

14:30 - 09:00

PHL

SYD

26h 30m1 stop

11:20 - 19:48

SYD

PHL

24h 28m1 stop

$1,546Qantas Airways

Mon, 9 Feb - Sat, 14 Feb

10:43 - 06:55

PHL

SYD

28h 12m1 stop

11:20 - 19:48

SYD

PHL

24h 28m1 stop

$1,562Multiple Airlines

Sat, 31 Jan - Fri, 13 Feb

18:40 - 06:55

PHL

SYD

44h 15m1 stop

17:45 - 05:51

SYD

PHL

27h 06m1 stop

$1,583Qantas Airways

Mon, 2 Mar - Mon, 16 Mar

Air New Zealand flights from Philadelphia to Sydney

Our best Air New Zealand deals on Philadelphia to Sydney flight tickets

Air New Zealand

28 Feb

PHL08:35Philadelphia

32h 10m

2 stops

SYD08:45Sydney Kingsford Smith

8 Mar

SYD19:15Sydney Kingsford Smith

51h 00m

2 stops

PHL07:15Philadelphia

$2,008

Find similar

Air New Zealand

8 Jan

PHL08:35Philadelphia

32h 40m

1 stop

SYD09:15Sydney Kingsford Smith

26 Jan

SYD09:55Sydney Kingsford Smith

27h 57m

2 stops

PHL21:52Philadelphia

$3,181

Find similar

Air New Zealand

10 Jan

PHL08:35Philadelphia

32h 40m

1 stop

SYD09:15Sydney Kingsford Smith

18 Jan

SYD11:45Sydney Kingsford Smith

27h 14m

2 stops

PHL22:59Philadelphia

$3,223

Find similar

Qantas Airways flights from Philadelphia to Sydney

Our best Qantas Airways deals on Philadelphia to Sydney flight tickets

Qantas Airways

24 Jan

PHL14:30Philadelphia

50h 40m

2 stops

SYD09:10Sydney Kingsford Smith

9 Feb

SYD11:20Sydney Kingsford Smith

35h 41m

1 stop

PHL07:01Philadelphia

$1,404

Find similar

Qantas Airways

16 Feb

PHL14:16Philadelphia

51h 49m

2 stops

SYD10:05Sydney Kingsford Smith

24 Feb

SYD21:25Sydney Kingsford Smith

26h 43m

1 stop

PHL08:08Philadelphia

$1,414

Find similar

Qantas Airways

19 Jan

PHL14:30Philadelphia

50h 40m

2 stops

SYD09:10Sydney Kingsford Smith

11 Feb

SYD11:20Sydney Kingsford Smith

35h 41m

1 stop

PHL07:01Philadelphia

$1,504

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 8/2

17:39-17:40

2 stops32h 01m

Sydney Kingsford Smith

Sat 14/2

11:20-19:48

1 stop24h 28m

$1,402

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 24/1

14:30-09:10

2 stops50h 40m

Sydney Kingsford Smith

Mon 9/2

11:20-07:01

1 stop35h 41m

$1,404

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 16/2

14:16-10:05

2 stops51h 49m

Sydney Kingsford Smith

Tue 24/2

21:25-08:08

1 stop26h 43m

$1,414

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 19/1

14:30-09:10

2 stops50h 40m

Sydney Kingsford Smith

Wed 11/2

11:20-07:01

1 stop35h 41m

$1,504

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sun 15/2

08:15-06:10

1 stop29h 55m

Sydney Kingsford Smith

Wed 25/2

19:15-19:48

2 stops40h 33m

$1,513

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 9/2

14:30-09:10

2 stops50h 40m

Sydney Kingsford Smith

Sat 14/2

11:20-19:48

1 stop24h 28m

$1,525

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

Mon 9/2

14:30-09:00

1 stop26h 30m

Sydney Kingsford Smith

Sat 14/2

11:20-19:48

1 stop24h 28m

$1,546

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 31/1

10:43-06:55

1 stop28h 12m

Sydney Kingsford Smith

Fri 13/2

11:20-19:48

1 stop24h 28m

$1,562

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 2/3

18:40-06:55

1 stop44h 15m

Sydney Kingsford Smith

Mon 16/3

17:45-05:51

1 stop27h 06m

$1,583

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Philadelphia to Sydney

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Sydney?

The month of February is, on average, the cheapest month to fly to Sydney from Philadelphia, with most prices found around $1,580. If you aren’t able to travel to Sydney during the month of February, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $1,637.

How far in advance should I book a flight to Sydney?

You are more likely to see cheaper flights to Sydney from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $2,126 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Philadelphia for as low as $1,567 on momondo.

Can stopping save me money on Philadelphia to Sydney flights?

You could potentially save up to 63% on your flight if you consider stops on a Philadelphia to Sydney flight.

How have Philadelphia to Sydney flight prices changed over time?

As of December 2025, prices for Philadelphia to Sydney flights are approximately 13% more expensive when compared to flights at the same time last year.

When to book flights from Philadelphia to Sydney

Are you open to changing your travel dates? Check out the ideal times to fly from Philadelphia to Sydney according to our flight data. Find out which month and days have the cheapest flights.

Estimated return price

Cheap Philadelphia to Sydney (PHL to SYD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Philadelphia to Sydney

Fastest flight time	22h 50m
Direct flights	None

The fastest flight from Philadelphia to Sydney takes 22h 50m

There are no direct flights from Philadelphia to Sydney. There are no popular flight routes from Philadelphia to Sydney.

Search flight deals

How far is Philadelphia to Sydney Kingsford Smith by plane?
The straight-line distance from Philadelphia to Sydney Kingsford Smith is 15874.2 km. In terms of flight time, this usually takes a little over 22h 50m.
When did momondo last update prices for flights from Philadelphia Airport to Sydney Kingsford Smith Airport?
Prices for flights from Philadelphia Airport to Sydney Kingsford Smith Airport are updated daily.
How old do you have to be to fly from Philadelphia Airport to Sydney Kingsford Smith Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to Sydney Kingsford Smith Airport.
What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?
The necessary travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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Why use momondo?

Why should I use momondo to find a flight deal from Philadelphia to Sydney?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Philadelphia to Sydney for you.

Can I find flights from Philadelphia to Sydney with flexible booking policies on momondo?

Yes. All flights to Sydney from Philadelphia on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Philadelphia to Sydney?

momondo provides multiple filters to help you find the best flight to Sydney from Philadelphia. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Philadelphia to Sydney right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Sydney from Philadelphia. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.