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Cheap flights from Portland to Sydney from $554

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 4/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult

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Cheap return flights

Enter your travel dates to find the best prices.
Hawaiian Airlines Logo
07:00 - 19:45PDX-SYD
17h 45m1 stop
Hawaiian Airlines Logo
21:40 - 21:50SYD-PDX
19h 10m1 stop
$1,529Hawaiian Airlines
Find Deal
Fri, 30 Jan - Sat, 14 Feb
Alaska Airlines Logo
07:10 - 19:45PDX-SYD
17h 35m1 stop
Alaska Airlines Logo
21:40 - 06:00SYD-PDX
26h 20m1 stop
$1,536Alaska Airlines
Find Deal
Thu, 26 Feb - Tue, 10 Mar
Hawaiian Airlines Logo
07:00 - 19:45PDX-SYD
17h 45m1 stop
Hawaiian Airlines Logo
21:40 - 15:45SYD-PDX
37h 05m1 stop
$1,555Hawaiian Airlines
Find Deal
Thu, 5 Feb - Thu, 5 Mar
Alaska Airlines Logo
10:40 - 19:45PDX-SYD
39h 05m1 stop
Alaska Airlines Logo
21:40 - 22:50SYD-PDX
19h 10m1 stop
$1,563Alaska Airlines
Find Deal
Tue, 17 Mar - Tue, 24 Mar
Multiple Airlines Logo
09:50 - 20:15PDX-SYD
39h 25m2 stops
Multiple Airlines Logo
16:00 - 18:30SYD-PDX
21h 30m1 stop
$1,595Multiple Airlines
Find Deal
Thu, 4 Dec - Thu, 11 Dec
Qantas Airways Logo
17:50 - 12:30PDX-SYD
23h 40m2 stops
Qantas Airways Logo
21:25 - 20:50SYD-PDX
18h 25m1 stop
$1,609Qantas Airways
Find Deal
Sun, 11 Jan - Tue, 27 Jan
Multiple Airlines Logo
17:32 - 09:00PDX-SYD
20h 28m1 stop
Multiple Airlines Logo
11:20 - 11:37SYD-PDX
19h 17m1 stop
$1,640Multiple Airlines
Find Deal
Thu, 11 Dec - Thu, 18 Dec
Air Canada Logo
09:50 - 09:35PDX-SYD
28h 45m1 stop
Air Canada Logo
11:20 - 14:40SYD-PDX
22h 20m1 stop
$1,652Air Canada
Find Deal
Tue, 18 Nov - Tue, 25 Nov
Air Canada Logo
15:15 - 14:40PDX-SYD
28h 25m2 stops
Air Canada Logo
11:20 - 09:15SYD-PDX
16h 55m1 stop
$1,681Air Canada
Find Deal
Sun, 30 Nov - Sun, 21 Dec
Qantas Airways Logo
14:50 - 09:00PDX-SYD
23h 10m1 stop
Qantas Airways Logo
11:20 - 17:12SYD-PDX
24h 52m1 stop
$1,814Qantas Airways
Find Deal
Tue, 4 Nov - Thu, 20 Nov

Alaska Airlines flights from Portland to Sydney

Our best Alaska Airlines deals on Portland to Sydney flight tickets
Alaska Airlines
26 Feb
PDX07:10Portland
17h 35m
1 stop
SYD19:45Sydney Kingsford Smith
10 Mar
SYD21:40Sydney Kingsford Smith
26h 20m
1 stop
PDX06:00Portland
$1,536
Find similar
Alaska Airlines
28 Oct
PDX10:35Portland
39h 10m
1 stop
SYD19:45Sydney Kingsford Smith
8 Nov
SYD21:40Sydney Kingsford Smith
37h 38m
1 stop
PDX16:18Portland
$1,555
Find similar
Alaska Airlines
23 Oct
PDX17:55Portland
31h 50m
1 stop
SYD19:45Sydney Kingsford Smith
6 Nov
SYD21:40Sydney Kingsford Smith
37h 38m
1 stop
PDX16:18Portland
$1,560
Find similar

Air Canada flights from Portland to Sydney

Our best Air Canada deals on Portland to Sydney flight tickets
Air Canada
18 Nov
PDX09:50Portland
28h 45m
1 stop
SYD09:35Sydney Kingsford Smith
25 Nov
SYD11:20Sydney Kingsford Smith
22h 20m
1 stop
PDX14:40Portland
$1,652
Find similar
Air Canada
30 Nov
PDX15:15Portland
28h 25m
2 stops
SYD14:40Sydney Kingsford Smith
21 Dec
SYD11:20Sydney Kingsford Smith
16h 55m
1 stop
PDX09:15Portland
$1,681
Find similar
Air Canada
10 Feb
PDX15:15Portland
23h 20m
1 stop
SYD09:35Sydney Kingsford Smith
24 Feb
SYD08:30Sydney Kingsford Smith
19h 45m
2 stops
PDX09:15Portland
$1,684
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 22 October 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

Fri 30/1

07:00-19:45

1 stop17h 45m

Sydney Kingsford Smith

Sat 14/2

21:40-21:50

1 stop19h 10m

$1,529

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 26/2

07:10-19:45

1 stop17h 35m

Sydney Kingsford Smith

Tue 10/3

21:40-06:00

1 stop26h 20m

$1,536

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 5/2

07:00-19:45

1 stop17h 45m

Sydney Kingsford Smith

Thu 5/3

21:40-15:45

1 stop37h 05m

$1,555

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 17/3

10:40-19:45

1 stop39h 05m

Sydney Kingsford Smith

Tue 24/3

21:40-22:50

1 stop19h 10m

$1,563

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 4/12

09:50-20:15

2 stops39h 25m

Sydney Kingsford Smith

Thu 11/12

16:00-18:30

1 stop21h 30m

$1,595

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 11/1

17:50-12:30

2 stops23h 40m

Sydney Kingsford Smith

Tue 27/1

21:25-20:50

1 stop18h 25m

$1,609

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 11/12

17:32-09:00

1 stop20h 28m

Sydney Kingsford Smith

Thu 18/12

11:20-11:37

1 stop19h 17m

$1,640

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 18/11

09:50-09:35

1 stop28h 45m

Sydney Kingsford Smith

Tue 25/11

11:20-14:40

1 stop22h 20m

$1,652

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 30/11

15:15-14:40

2 stops28h 25m

Sydney Kingsford Smith

Sun 21/12

11:20-09:15

1 stop16h 55m

$1,681

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 4/11

14:50-09:00

1 stop23h 10m

Sydney Kingsford Smith

Thu 20/11

11:20-17:12

1 stop24h 52m

$1,814

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 $1,529. If you aren’t able to travel to Sydney during the month of September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $1,543.

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 $1,246. The most expensive day to fly to Sydney is Sunday, with ticket prices averaging around $2,023.

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 $1,399. 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 $1,814 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 $1,711 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 $1,566 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 October 2025, prices for Portland to Sydney flights are approximately 26% 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.
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  • 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 35m.

  • 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 $1,279Free cancellationRating
7.4
8,988 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
Randwick
Cronulla
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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