Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Portland to Sydney from $732

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 9/12. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Portland to Sydney

Cheap return flights

Enter your travel dates to find the best prices.
Air Canada Logo
09:50 - 09:35PDX-SYD
28h 45m1 stop
Air Canada Logo
11:20 - 18:30SYD-PDX
26h 10m1 stop
$1,551Air Canada
Find Deal
Tue, 17 Feb - Tue, 3 Mar
Multiple Airlines Logo
19:00 - 08:35PDX-SYD
19h 35m1 stop
Multiple Airlines Logo
21:20 - 09:15SYD-PDX
29h 55m2 stops
$1,574Multiple Airlines
Find Deal
Tue, 17 Mar - Tue, 24 Mar
Air Canada Logo
19:00 - 16:40PDX-SYD
26h 40m2 stops
Air Canada Logo
11:20 - 09:15SYD-PDX
16h 55m1 stop
$1,580Air Canada
Find Deal
Tue, 17 Feb - Tue, 3 Mar
Qantas Airways Logo
16:51 - 06:10PDX-SYD
18h 19m1 stop
Qantas Airways Logo
07:15 - 17:11SYD-PDX
28h 56m2 stops
$1,591Qantas Airways
Find Deal
Fri, 6 Feb - Mon, 23 Feb
Multiple Airlines Logo
19:00 - 13:00PDX-SYD
23h 00m2 stops
Multiple Airlines Logo
11:20 - 09:15SYD-PDX
16h 55m1 stop
$1,592Multiple Airlines
Find Deal
Tue, 17 Feb - Tue, 3 Mar
Air Canada Logo
19:00 - 08:35PDX-SYD
19h 35m1 stop
Air Canada Logo
10:20 - 18:30SYD-PDX
26h 10m1 stop
$1,597Air Canada
Find Deal
Mon, 9 Mar - Tue, 24 Mar
Air Canada Logo
15:15 - 09:35PDX-SYD
23h 20m1 stop
Air Canada Logo
08:30 - 09:15SYD-PDX
19h 45m2 stops
$1,611Air Canada
Find Deal
Tue, 18 Nov - Wed, 3 Dec
Qantas Airways Logo
06:40 - 07:35PDX-SYD
53h 55m2 stops
Qantas Airways Logo
21:25 - 20:38SYD-PDX
17h 13m1 stop
$1,631Qantas Airways
Find Deal
Thu, 26 Feb - Tue, 10 Mar
Alaska Airlines Logo
07:10 - 19:45PDX-SYD
18h 35m1 stop
Alaska Airlines Logo
21:40 - 22:50SYD-PDX
19h 10m1 stop
$1,749Alaska Airlines
Find Deal
Mon, 9 Mar - Tue, 24 Mar
Alaska Airlines Logo
07:10 - 19:45PDX-SYD
18h 35m1 stop
Alaska Airlines Logo
21:40 - 06:11SYD-PDX
26h 31m2 stops
$1,765Alaska Airlines
Find Deal
Mon, 9 Mar - Tue, 24 Mar

Air Canada flights from Portland to Sydney

Our best Air Canada deals on Portland to Sydney flight tickets
Air Canada
17 Feb
PDX09:50Portland
28h 45m
1 stop
SYD09:35Sydney Kingsford Smith
3 Mar
SYD11:20Sydney Kingsford Smith
26h 10m
1 stop
PDX18:30Portland
$1,551
Find similar
Air Canada
17 Feb
PDX19:00Portland
26h 40m
2 stops
SYD16:40Sydney Kingsford Smith
3 Mar
SYD11:20Sydney Kingsford Smith
16h 55m
1 stop
PDX09:15Portland
$1,580
Find similar
Air Canada
9 Mar
PDX19:00Portland
19h 35m
1 stop
SYD08:35Sydney Kingsford Smith
24 Mar
SYD10:20Sydney Kingsford Smith
26h 10m
1 stop
PDX18:30Portland
$1,597
Find similar

Alaska Airlines flights from Portland to Sydney

Our best Alaska Airlines deals on Portland to Sydney flight tickets
Alaska Airlines
9 Mar
PDX07:10Portland
18h 35m
1 stop
SYD19:45Sydney Kingsford Smith
24 Mar
SYD21:40Sydney Kingsford Smith
19h 10m
1 stop
PDX22:50Portland
$1,749
Find similar
Alaska Airlines
9 Mar
PDX07:10Portland
18h 35m
1 stop
SYD19:45Sydney Kingsford Smith
24 Mar
SYD21:40Sydney Kingsford Smith
26h 31m
2 stops
PDX06:11Portland
$1,765
Find similar
Alaska Airlines
10 Nov
PDX07:09Portland
17h 36m
1 stop
SYD19:45Sydney Kingsford Smith
12 Dec
SYD21:40Sydney Kingsford Smith
18h 10m
1 stop
PDX20:50Portland
$1,783
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 5 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

Tue 17/2

09:50-09:35

1 stop28h 45m

Sydney Kingsford Smith

Tue 3/3

11:20-18:30

1 stop26h 10m

$1,551

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 17/3

19:00-08:35

1 stop19h 35m

Sydney Kingsford Smith

Tue 24/3

21:20-09:15

2 stops29h 55m

$1,574

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 17/2

19:00-16:40

2 stops26h 40m

Sydney Kingsford Smith

Tue 3/3

11:20-09:15

1 stop16h 55m

$1,580

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 6/2

16:51-06:10

1 stop18h 19m

Sydney Kingsford Smith

Mon 23/2

07:15-17:11

2 stops28h 56m

$1,591

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 17/2

19:00-13:00

2 stops23h 00m

Sydney Kingsford Smith

Tue 3/3

11:20-09:15

1 stop16h 55m

$1,592

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 9/3

19:00-08:35

1 stop19h 35m

Sydney Kingsford Smith

Tue 24/3

10:20-18:30

1 stop26h 10m

$1,597

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 18/11

15:15-09:35

1 stop23h 20m

Sydney Kingsford Smith

Wed 3/12

08:30-09:15

2 stops19h 45m

$1,611

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 26/2

06:40-07:35

2 stops53h 55m

Sydney Kingsford Smith

Tue 10/3

21:25-20:38

1 stop17h 13m

$1,631

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 9/3

07:10-19:45

1 stop18h 35m

Sydney Kingsford Smith

Tue 24/3

21:40-22:50

1 stop19h 10m

$1,749

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 9/3

07:10-19:45

1 stop18h 35m

Sydney Kingsford Smith

Tue 24/3

21:40-06:11

2 stops26h 31m

$1,765

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Sydney from

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 $1,526. 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 $1,545.

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 $1,244. The most expensive day to fly to Sydney is Sunday, with ticket prices averaging around $2,020.

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 $1,396. 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 $1,811 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 $1,715 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 $1,563 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 18h 19m.

  • 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 $1,277Free cancellationRating
7.4
9,002 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.

An easier way to manage your Sydney trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Fri 5/12
Fri 12/12
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Australia