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Cheap flights from Portland to Sydney from $859

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 29/3. 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

Enter your travel dates to find the best prices.
Multiple Airlines Logo
17:30 - 09:20PDX-SYD
21h 50m2 stops
Multiple Airlines Logo
21:25 - 20:38SYD-PDX
17h 13m1 stop
$1,531Multiple Airlines
Find Deal
Mon, 9 Mar - Tue, 24 Mar
Qantas Airways Logo
16:26 - 09:20PDX-SYD
21h 54m2 stops
Qantas Airways Logo
21:25 - 20:50SYD-PDX
18h 25m1 stop
$1,559Qantas Airways
Find Deal
Mon, 29 Dec - Tue, 20 Jan
Qantas Airways Logo
14:30 - 06:10PDX-SYD
20h 40m1 stop
Qantas Airways Logo
08:00 - 17:11SYD-PDX
28h 11m2 stops
$1,565Qantas Airways
Find Deal
Fri, 6 Feb - Mon, 23 Feb
Qantas Airways Logo
14:50 - 06:10PDX-SYD
21h 20m1 stop
Qantas Airways Logo
17:30 - 22:36SYD-PDX
23h 06m2 stops
$1,571Qantas Airways
Find Deal
Tue, 17 Mar - Tue, 24 Mar
Qantas Airways Logo
16:51 - 06:10PDX-SYD
18h 19m1 stop
Qantas Airways Logo
22:00 - 12:21SYD-PDX
33h 21m2 stops
$1,573Qantas Airways
Find Deal
Fri, 6 Feb - Sat, 7 Mar
Air Canada Logo
19:00 - 09:35PDX-SYD
19h 35m1 stop
Air Canada Logo
11:20 - 14:40SYD-PDX
21h 20m1 stop
$1,716Air Canada
Find Deal
Wed, 25 Feb - Mon, 9 Mar
Air Canada Logo
15:15 - 07:20PDX-SYD
23h 05m1 stop
Air Canada Logo
06:00 - 09:15SYD-PDX
20h 15m2 stops
$1,740Air Canada
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Sun, 19 Apr - Sun, 26 Apr
Hawaiian Airlines Logo
07:00 - 19:45PDX-SYD
17h 45m1 stop
Hawaiian Airlines Logo
21:40 - 05:25SYD-PDX
26h 45m1 stop
$1,774Hawaiian Airlines
Find Deal
Fri, 28 Nov - Thu, 11 Dec
Alaska Airlines Logo
07:10 - 19:45PDX-SYD
17h 35m1 stop
Alaska Airlines Logo
21:40 - 04:20SYD-PDX
25h 40m2 stops
$1,787Alaska Airlines
Find Deal
Mon, 23 Feb - Sat, 7 Mar
Alaska Airlines Logo
17:45 - 19:45PDX-SYD
31h 00m2 stops
Alaska Airlines Logo
21:40 - 06:00SYD-PDX
27h 20m1 stop
$1,789Alaska Airlines
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Thu, 29 Jan - Sun, 15 Feb

Qantas Airways flights from Portland to Sydney

Our best Qantas Airways deals on Portland to Sydney flight tickets
Qantas Airways
29 Dec
PDX16:26Portland
21h 54m
2 stops
SYD09:20Sydney Kingsford Smith
20 Jan
SYD21:25Sydney Kingsford Smith
18h 25m
1 stop
PDX20:50Portland
$1,559
Find similar
Qantas Airways
6 Feb
PDX14:30Portland
20h 40m
1 stop
SYD06:10Sydney Kingsford Smith
23 Feb
SYD08:00Sydney Kingsford Smith
28h 11m
2 stops
PDX17:11Portland
$1,565
Find similar
Qantas Airways
17 Mar
PDX14:50Portland
21h 20m
1 stop
SYD06:10Sydney Kingsford Smith
24 Mar
SYD17:30Sydney Kingsford Smith
23h 06m
2 stops
PDX22:36Portland
$1,571
Find similar

Alaska Airlines flights from Portland to Sydney

Our best Alaska Airlines deals on Portland to Sydney flight tickets
Alaska Airlines
10 Nov
PDX07:09Portland
17h 36m
1 stop
SYD19:45Sydney Kingsford Smith
12 Dec
SYD21:40Sydney Kingsford Smith
27h 20m
2 stops
PDX06:00Portland
$1,787
Find similar
Alaska Airlines
29 Jan
PDX17:45Portland
31h 00m
2 stops
SYD19:45Sydney Kingsford Smith
15 Feb
SYD21:40Sydney Kingsford Smith
27h 20m
1 stop
PDX06:00Portland
$1,789
Find similar
Alaska Airlines
4 Jan
PDX17:40Portland
31h 05m
1 stop
SYD19:45Sydney Kingsford Smith
24 Jan
SYD21:40Sydney Kingsford Smith
26h 33m
2 stops
PDX05:13Portland
$1,814
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 8 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

17:30-09:20

2 stops21h 50m

Sydney Kingsford Smith

Tue 24/3

21:25-20:38

1 stop17h 13m

$1,531

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 29/12

16:26-09:20

2 stops21h 54m

Sydney Kingsford Smith

Tue 20/1

21:25-20:50

1 stop18h 25m

$1,559

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 6/2

14:30-06:10

1 stop20h 40m

Sydney Kingsford Smith

Mon 23/2

08:00-17:11

2 stops28h 11m

$1,565

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 17/3

14:50-06:10

1 stop21h 20m

Sydney Kingsford Smith

Tue 24/3

17:30-22:36

2 stops23h 06m

$1,571

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 6/2

16:51-06:10

1 stop18h 19m

Sydney Kingsford Smith

Sat 7/3

22:00-12:21

2 stops33h 21m

$1,573

PortlandSydney

PDX - SYD

PDXSYD

Portland

Wed 25/2

19:00-09:35

1 stop19h 35m

Sydney Kingsford Smith

Mon 9/3

11:20-14:40

1 stop21h 20m

$1,716

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 19/4

15:15-07:20

1 stop23h 05m

Sydney Kingsford Smith

Sun 26/4

06:00-09:15

2 stops20h 15m

$1,740

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 28/11

07:00-19:45

1 stop17h 45m

Sydney Kingsford Smith

Thu 11/12

21:40-05:25

1 stop26h 45m

$1,774

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 23/2

07:10-19:45

1 stop17h 35m

Sydney Kingsford Smith

Sat 7/3

21:40-04:20

2 stops25h 40m

$1,787

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 29/1

17:45-19:45

2 stops31h 00m

Sydney Kingsford Smith

Sun 15/2

21:40-06:00

1 stop27h 20m

$1,789

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 $1,531. 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 $1,550.

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 $2,026.

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 $1,720 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 $1,568 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.
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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 $1,281Free cancellationRating
7.4
9,012 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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