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

United Airlines, Fiji Airways, and Qantas Airways are the most popular carriers 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 45% of people opting to fly with this airline when travelling to Sydney. Keep in mind that there are 4 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.

$680 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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18:20 - 09:15PHL-SYD

22h 55m1 stop

11:20 - 23:30SYD-PHL

28h 10m2 stops

$1,338United Airlines

Find Deal

Mon, 16 Feb - Mon, 2 Mar

08:03 - 09:05PHL-SYD

34h 02m2 stops

09:30 - 00:32SYD-PHL

29h 02m2 stops

$1,341United Airlines

Find Deal

Tue, 24 Mar - Fri, 10 Apr

18:35 - 12:30PHL-SYD

26h 55m2 stops

14:10 - 22:46SYD-PHL

23h 36m2 stops

$1,869Fiji Airways

Find Deal

Sat, 14 Mar - Sat, 28 Mar

17:37 - 12:30PHL-SYD

26h 53m2 stops

14:10 - 21:09SYD-PHL

22h 59m2 stops

$1,923Fiji Airways

Find Deal

Thu, 5 Feb - Thu, 19 Feb

15:55 - 09:00PHL-SYD

25h 05m1 stop

06:20 - 19:04SYD-PHL

28h 44m2 stops

$1,966Qantas Airways

Find Deal

Tue, 11 Nov - Tue, 18 Nov

14:30 - 17:40PHL-SYD

35h 10m2 stops

11:20 - 19:24SYD-PHL

24h 04m1 stop

$1,967Qantas Airways

Find Deal

Thu, 5 Feb - Thu, 19 Feb

10:27 - 09:00PHL-SYD

30h 33m1 stop

11:20 - 23:46SYD-PHL

28h 26m1 stop

$2,064American Airlines

Find Deal

Mon, 10 Nov - Sun, 16 Nov

15:36 - 09:00PHL-SYD

25h 24m2 stops

11:20 - 20:03SYD-PHL

24h 43m1 stop

$2,070American Airlines

Find Deal

Tue, 11 Nov - Tue, 18 Nov

16:35 - 09:35PHL-SYD

49h 00m2 stops

11:20 - 22:56SYD-PHL

27h 36m2 stops

$2,087Air Canada

Find Deal

Sat, 24 Jan - Mon, 9 Feb

16:35 - 09:35PHL-SYD

49h 00m2 stops

11:20 - 14:47SYD-PHL

43h 27m3 stops

$2,090Air Canada

Find Deal

Sat, 24 Jan - Mon, 9 Feb

United Airlines flights from Philadelphia to Sydney

Our best United Airlines deals on Philadelphia to Sydney flight tickets

United Airlines

16 Feb

PHL18:20Philadelphia

22h 55m

1 stop

SYD09:15Sydney Kingsford Smith

2 Mar

SYD11:20Sydney Kingsford Smith

28h 10m

2 stops

PHL23:30Philadelphia

$1,338

Find similar

United Airlines

24 Mar

PHL08:03Philadelphia

34h 02m

2 stops

SYD09:05Sydney Kingsford Smith

10 Apr

SYD09:30Sydney Kingsford Smith

29h 02m

2 stops

PHL00:32Philadelphia

$1,341

Find similar

United Airlines

21 Mar

PHL12:45Philadelphia

27h 15m

1 stop

SYD07:00Sydney Kingsford Smith

25 Mar

SYD10:20Sydney Kingsford Smith

27h 35m

2 stops

PHL22:55Philadelphia

$1,342

Find similar

Qantas Airways flights from Philadelphia to Sydney

Our best Qantas Airways deals on Philadelphia to Sydney flight tickets

Qantas Airways

11 Nov

PHL15:55Philadelphia

25h 05m

1 stop

SYD09:00Sydney Kingsford Smith

18 Nov

SYD06:20Sydney Kingsford Smith

28h 44m

2 stops

PHL19:04Philadelphia

$1,966

Find similar

Qantas Airways

5 Feb

PHL14:30Philadelphia

35h 10m

2 stops

SYD17:40Sydney Kingsford Smith

19 Feb

SYD11:20Sydney Kingsford Smith

24h 04m

1 stop

PHL19:24Philadelphia

$1,967

Find similar

Qantas Airways

3 Dec

PHL16:03Philadelphia

36h 47m

2 stops

SYD20:50Sydney Kingsford Smith

14 Jan

SYD11:20Sydney Kingsford Smith

24h 56m

1 stop

PHL20:16Philadelphia

$1,973

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 16/2

18:20-09:15

1 stop22h 55m

Sydney Kingsford Smith

Mon 2/3

11:20-23:30

2 stops28h 10m

$1,338

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 24/3

08:03-09:05

2 stops34h 02m

Sydney Kingsford Smith

Fri 10/4

09:30-00:32

2 stops29h 02m

$1,341

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 14/3

18:35-12:30

2 stops26h 55m

Sydney Kingsford Smith

Sat 28/3

14:10-22:46

2 stops23h 36m

$1,869

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Thu 5/2

17:37-12:30

2 stops26h 53m

Sydney Kingsford Smith

Thu 19/2

14:10-21:09

2 stops22h 59m

$1,923

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 11/11

15:55-09:00

1 stop25h 05m

Sydney Kingsford Smith

Tue 18/11

06:20-19:04

2 stops28h 44m

$1,966

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Thu 5/2

14:30-17:40

2 stops35h 10m

Sydney Kingsford Smith

Thu 19/2

11:20-19:24

1 stop24h 04m

$1,967

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Mon 10/11

10:27-09:00

1 stop30h 33m

Sydney Kingsford Smith

Sun 16/11

11:20-23:46

1 stop28h 26m

$2,064

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Tue 11/11

15:36-09:00

2 stops25h 24m

Sydney Kingsford Smith

Tue 18/11

11:20-20:03

1 stop24h 43m

$2,070

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 24/1

16:35-09:35

2 stops49h 00m

Sydney Kingsford Smith

Mon 9/2

11:20-22:56

2 stops27h 36m

$2,087

PhiladelphiaSydney

PHL - SYD

PHLSYD

Philadelphia

Sat 24/1

16:35-09:35

2 stops49h 00m

Sydney Kingsford Smith

Mon 9/2

11:20-14:47

3 stops43h 27m

$2,090

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 September is, on average, the cheapest month to fly to Sydney from Philadelphia, with most prices found around $1,731. If you aren’t able to travel to Sydney during the month of September, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $1,926.

What is the cheapest day to depart on your flight to Sydney?

Our data shows that Tuesday is the least expensive day to fly to Sydney. Tickets to fly out on this day can be as low as $2,077. The most expensive day to fly to Sydney is Wednesday, with ticket prices averaging around $3,840.

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 $2,344 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 $1,764 on momondo.

Can stopping save me money on Philadelphia to Sydney flights?

You could potentially save up to 61% 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 October 2025, prices for Philadelphia to Sydney flights are approximately 30% cheaper 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

Direct flights	None

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

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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 52m.
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.