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Cheap flights from Portland to Sydney from $720

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Sydney departing on 4/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap return flights

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Multiple Airlines Logo
17:39 - 09:20PDX-SYD
21h 41m2 stops
Multiple Airlines Logo
21:25 - 20:38SYD-PDX
17h 13m1 stop
$1,317Multiple Airlines
Find Deal
Mon, 9 Mar - Tue, 24 Mar
Qantas Airways Logo
17:50 - 06:10PDX-SYD
18h 20m1 stop
Qantas Airways Logo
16:15 - 22:36SYD-PDX
24h 21m2 stops
$1,404Qantas Airways
Find Deal
Fri, 13 Mar - Fri, 20 Mar
Qantas Airways Logo
16:32 - 06:10PDX-SYD
18h 38m1 stop
Qantas Airways Logo
06:05 - 20:21SYD-PDX
33h 16m2 stops
$1,433Qantas Airways
Find Deal
Fri, 5 Dec - Wed, 10 Dec
Multiple Airlines Logo
17:39 - 09:20PDX-SYD
21h 41m2 stops
Multiple Airlines Logo
21:25 - 20:38SYD-PDX
17h 13m1 stop
$1,475Multiple Airlines
Find Deal
Tue, 17 Mar - Tue, 24 Mar
Qantas Airways Logo
16:51 - 06:10PDX-SYD
18h 19m1 stop
Qantas Airways Logo
07:05 - 17:11SYD-PDX
29h 06m2 stops
$1,476Qantas Airways
Find Deal
Fri, 30 Jan - Sat, 14 Feb
Qantas Airways Logo
06:40 - 20:50PDX-SYD
43h 10m2 stops
Qantas Airways Logo
21:25 - 20:34SYD-PDX
17h 09m1 stop
$1,522Qantas Airways
Find Deal
Thu, 26 Feb - Tue, 10 Mar
Qantas Airways Logo
06:40 - 20:50PDX-SYD
43h 10m2 stops
Qantas Airways Logo
21:25 - 20:34SYD-PDX
17h 09m1 stop
$1,524Qantas Airways
Find Deal
Thu, 26 Feb - Tue, 10 Mar
Qantas Airways Logo
06:40 - 09:00PDX-SYD
31h 20m1 stop
Qantas Airways Logo
17:50 - 17:11SYD-PDX
42h 21m2 stops
$1,543Qantas Airways
Find Deal
Sat, 14 Feb - Mon, 23 Feb
Qantas Airways Logo
05:41 - 07:25PDX-SYD
30h 44m1 stop
Qantas Airways Logo
19:15 - 13:41SYD-PDX
37h 26m2 stops
$1,553Qantas Airways
Find Deal
Mon, 8 Dec - Mon, 12 Jan
Qantas Airways Logo
16:26 - 09:20PDX-SYD
21h 54m2 stops
Qantas Airways Logo
21:25 - 20:48SYD-PDX
18h 23m1 stop
$1,559Qantas Airways
Find Deal
Mon, 29 Dec - Tue, 13 Jan

Qantas Airways flights from Portland to Sydney

Our best Qantas Airways deals on Portland to Sydney flight tickets
Qantas Airways
13 Mar
PDX17:50Portland
18h 20m
1 stop
SYD06:10Sydney Kingsford Smith
20 Mar
SYD16:15Sydney Kingsford Smith
24h 21m
2 stops
PDX22:36Portland
$1,404
Find similar
Qantas Airways
5 Dec
PDX16:32Portland
18h 38m
1 stop
SYD06:10Sydney Kingsford Smith
10 Dec
SYD06:05Sydney Kingsford Smith
33h 16m
2 stops
PDX20:21Portland
$1,433
Find similar
Qantas Airways
30 Jan
PDX16:51Portland
18h 19m
1 stop
SYD06:10Sydney Kingsford Smith
14 Feb
SYD07:05Sydney Kingsford Smith
29h 06m
2 stops
PDX17:11Portland
$1,476
Find similar

Air Canada flights from Portland to Sydney

Our best Air Canada deals on Portland to Sydney flight tickets
Air Canada
30 Nov
PDX19:00Portland
19h 35m
1 stop
SYD09:35Sydney Kingsford Smith
21 Dec
SYD11:20Sydney Kingsford Smith
26h 10m
1 stop
PDX18:30Portland
$1,615
Find similar
Air Canada
2 Feb
PDX19:00Portland
19h 35m
1 stop
SYD09:35Sydney Kingsford Smith
8 Feb
SYD09:00Sydney Kingsford Smith
24h 40m
2 stops
PDX14:40Portland
$1,638
Find similar
Air Canada
8 Dec
PDX15:15Portland
23h 20m
1 stop
SYD09:35Sydney Kingsford Smith
15 Dec
SYD11:20Sydney Kingsford Smith
16h 55m
1 stop
PDX09:15Portland
$1,657
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Portland 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, momondo users made 78,305 searches. Data last updated 20 November 2025.
Use the filters below to find and compare flights from Portland to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 9/3

17:39-09:20

2 stops21h 41m

Sydney Kingsford Smith

Tue 24/3

21:25-20:38

1 stop17h 13m

$1,317

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 13/3

17:50-06:10

1 stop18h 20m

Sydney Kingsford Smith

Fri 20/3

16:15-22:36

2 stops24h 21m

$1,404

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 5/12

16:32-06:10

1 stop18h 38m

Sydney Kingsford Smith

Wed 10/12

06:05-20:21

2 stops33h 16m

$1,433

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 17/3

17:39-09:20

2 stops21h 41m

Sydney Kingsford Smith

Tue 24/3

21:25-20:38

1 stop17h 13m

$1,475

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 30/1

16:51-06:10

1 stop18h 19m

Sydney Kingsford Smith

Sat 14/2

07:05-17:11

2 stops29h 06m

$1,476

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 26/2

06:40-20:50

2 stops43h 10m

Sydney Kingsford Smith

Tue 10/3

21:25-20:34

1 stop17h 09m

$1,522

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 26/2

06:40-20:50

2 stops43h 10m

Sydney Kingsford Smith

Tue 10/3

21:25-20:34

1 stop17h 09m

$1,524

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sat 14/2

06:40-09:00

1 stop31h 20m

Sydney Kingsford Smith

Mon 23/2

17:50-17:11

2 stops42h 21m

$1,543

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 8/12

05:41-07:25

1 stop30h 44m

Sydney Kingsford Smith

Mon 12/1

19:15-13:41

2 stops37h 26m

$1,553

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 29/12

16:26-09:20

2 stops21h 54m

Sydney Kingsford Smith

Tue 13/1

21:25-20:48

1 stop18h 23m

$1,559

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Portland 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

What is the typical price of a round-trip flight between Portland and Sydney?

What is the cheapest month to fly to Sydney?

The month of September is, on average, the cheapest month to fly to Sydney from Portland, with most prices found around $1,532. If you aren’t able to travel to Sydney during the month of September, then flying in June is also cheap. Prices for this month can be found on momondo for an average of $1,533.

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

Our data shows that Wednesday is the least expensive day to fly to Sydney. Tickets to fly out on this day can be as low as $1,248. The most expensive day to fly to Sydney is Sunday, with ticket prices averaging around $2,027.

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

According to our data, the cheapest time of day to fly to Sydney is in the morning. momondo users have found flights departing from Portland to Sydney in the morning for as low as $1,401. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $1,817 on average. Flights to Sydney from Portland in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to Sydney from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,740 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 Portland for as low as $1,394 on momondo.

Can stopping save me money on Portland to Sydney flights?

You could potentially save up to 7% on your flight if you consider stops on a Portland to Sydney flight.

How have Portland to Sydney flight prices changed over time?

As of November 2025, prices for Portland to Sydney flights are approximately 32% cheaper when compared to flights at the same time last year.

When to book flights from Portland to Sydney

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

Cheap Portland to Sydney (PDX to SYD) flight deals and tips

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

Direct flights

None
There are no direct flights from Portland to Sydney. There are no popular flight routes from Portland to Sydney.
Search flight deals

  • How far is Portland to Sydney Kingsford Smith by plane?

    There are 12333.8 km between Portland and Sydney Kingsford Smith. By plane, this route typically takes 17h 45m.

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

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

  • How many operators does momondo search for flights from Portland Airport to Sydney Kingsford Smith Airport?

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and stopovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Portland Airport to Sydney Kingsford Smith Airport.

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

    The travel and health documents you'll need for your trip to Sydney Kingsford Smith Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Sydney Kingsford Smith Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Portland to Sydney?

Best airlines flying from Portland to Sydney

Compare and see reviews for airlines that fly from Portland to Sydney with momondo
Airline
Rating
Free cancellation
Price
United AirlinesPriceFrom $1,282Free cancellationRating
7.4
9,025 reviews
Search United Airlines flights

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Terrigal
Penrith
Katoomba
Lithgow
Leura
Manly
Bondi Beach
Coogee
Cronulla
Randwick
Charlestown
Newport
Swansea

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Portland to Sydney . Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo enables you to select and highlight flights to Sydney from Portland with this policy.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Sydney from Portland.

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

Yes. momondo can track prices for Portland to Sydney flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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