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Cheap flights from Portland to Sydney from $570

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 11/9. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Portland to Sydney

Cheap round-trip flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
8:00 am - 6:50 pm
PDX
-
SYD
17h 50m
1 stop
Alaska Airlines Logo
8:45 pm - 8:46 pm
SYD
-
PDX
17h 01m
1 stop
$1,081Alaska Airlines
Mon, Aug 24 - Sun, Aug 30
Alaska Airlines Logo
8:00 am - 6:50 pm
PDX
-
SYD
17h 50m
1 stop
Alaska Airlines Logo
8:45 pm - 8:46 pm
SYD
-
PDX
17h 01m
1 stop
$1,095Alaska Airlines
Mon, Aug 31 - Sun, Sep 13
Alaska Airlines Logo
8:00 am - 6:50 pm
PDX
-
SYD
17h 50m
1 stop
Alaska Airlines Logo
8:45 pm - 6:14 am
SYD
-
PDX
26h 29m
1 stop
$1,096Alaska Airlines
Mon, Aug 31 - Sun, Sep 13
Multiple Airlines Logo
5:50 pm - 7:45 pm
PDX
-
SYD
30h 55m
1 stop
Multiple Airlines Logo
9:40 pm - 6:05 am
SYD
-
PDX
27h 25m
1 stop
$1,108Multiple Airlines
Sun, Nov 1 - Sun, Nov 15
Alaska Airlines Logo
10:30 am - 6:50 pm
PDX
-
SYD
39h 20m
1 stop
Alaska Airlines Logo
8:45 pm - 6:11 am
SYD
-
PDX
26h 26m
1 stop
$1,112Alaska Airlines
Tue, Aug 4 - Tue, Aug 11
Multiple Airlines Logo
7:00 am - 7:45 pm
PDX
-
SYD
17h 45m
1 stop
Multiple Airlines Logo
9:40 pm - 8:49 pm
SYD
-
PDX
18h 09m
1 stop
$1,115Multiple Airlines
Mon, Nov 2 - Tue, Nov 10
Alaska Airlines Logo
7:46 am - 6:50 pm
PDX
-
SYD
18h 04m
1 stop
Alaska Airlines Logo
8:45 pm - 8:50 pm
SYD
-
PDX
17h 05m
1 stop
$1,116Alaska Airlines
Wed, Jul 29 - Tue, Aug 11
Alaska Airlines Logo
10:30 am - 6:50 pm
PDX
-
SYD
39h 20m
1 stop
Alaska Airlines Logo
8:45 pm - 8:46 pm
SYD
-
PDX
17h 01m
1 stop
$1,119Alaska Airlines
Tue, Sep 8 - Sun, Sep 13
Alaska Airlines Logo
8:00 am - 6:50 pm
PDX
-
SYD
17h 50m
1 stop
Alaska Airlines Logo
8:45 pm - 8:46 pm
SYD
-
PDX
17h 01m
1 stop
$1,128Alaska Airlines
Fri, Sep 4 - Sun, Sep 13
Alaska Airlines Logo
5:32 pm - 6:50 pm
PDX
-
SYD
32h 18m
1 stop
Alaska Airlines Logo
8:45 pm - 8:50 pm
SYD
-
PDX
17h 05m
1 stop
$1,133Alaska Airlines
Sun, Jul 26 - Tue, Aug 11

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Qantas Airways flights from Portland to Sydney

Our best Qantas Airways deals on Portland to Sydney flight tickets
Qantas Airways
Nov 9
PDX5:00 pmPortland
22h 20m
2 stops
SYD10:20 amSydney Kingsford Smith
Nov 18
SYD9:25 pmSydney Kingsford Smith
18h 25m
1 stop
PDX8:50 pmPortland
$1,137
Qantas Airways
Oct 6
PDX2:49 pmPortland
21h 36m
1 stop
SYD6:25 amSydney Kingsford Smith
Oct 19
SYD10:20 amSydney Kingsford Smith
30h 38m
2 stops
PDX10:58 pmPortland
$1,172
Qantas Airways
Oct 6
PDX2:49 pmPortland
21h 36m
1 stop
SYD6:25 amSydney Kingsford Smith
Oct 19
SYD5:10 pmSydney Kingsford Smith
23h 48m
2 stops
PDX10:58 pmPortland
$1,180

Alaska Airlines flights from Portland to Sydney

Our best Alaska Airlines deals on Portland to Sydney flight tickets
Alaska Airlines
Jun 29
PDX7:46 amPortland
18h 04m
1 stop
SYD6:50 pmSydney Kingsford Smith
Jul 12
SYD8:45 pmSydney Kingsford Smith
17h 05m
1 stop
PDX8:50 pmPortland
$1,053
Alaska Airlines
Aug 31
PDX8:00 amPortland
17h 50m
1 stop
SYD6:50 pmSydney Kingsford Smith
Sep 13
SYD8:45 pmSydney Kingsford Smith
17h 01m
1 stop
PDX8:46 pmPortland
$1,081
Alaska Airlines
Aug 31
PDX8:00 amPortland
17h 50m
1 stop
SYD6:50 pmSydney Kingsford Smith
Sep 13
SYD8:45 pmSydney Kingsford Smith
17h 01m
1 stop
PDX8:46 pmPortland
$1,095

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated June 23, 2026.
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

Cheapest round-trip
Quickest round-trip

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 8/24

8:00 am-6:50 pm

1 stop17h 50m

Sydney Kingsford Smith

Sun 8/30

8:45 pm-8:46 pm

1 stop17h 01m

$1,081

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 8/31

8:00 am-6:50 pm

1 stop17h 50m

Sydney Kingsford Smith

Sun 9/13

8:45 pm-8:46 pm

1 stop17h 01m

$1,095

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 8/31

8:00 am-6:50 pm

1 stop17h 50m

Sydney Kingsford Smith

Sun 9/13

8:45 pm-6:14 am

1 stop26h 29m

$1,096

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 11/1

5:50 pm-7:45 pm

1 stop30h 55m

Sydney Kingsford Smith

Sun 11/15

9:40 pm-6:05 am

1 stop27h 25m

$1,108

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 8/4

10:30 am-6:50 pm

1 stop39h 20m

Sydney Kingsford Smith

Tue 8/11

8:45 pm-6:11 am

1 stop26h 26m

$1,112

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 11/2

7:00 am-7:45 pm

1 stop17h 45m

Sydney Kingsford Smith

Tue 11/10

9:40 pm-8:49 pm

1 stop18h 09m

$1,115

PortlandSydney

PDX - SYD

PDXSYD

Portland

Wed 7/29

7:46 am-6:50 pm

1 stop18h 04m

Sydney Kingsford Smith

Tue 8/11

8:45 pm-8:50 pm

1 stop17h 05m

$1,116

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 9/8

10:30 am-6:50 pm

1 stop39h 20m

Sydney Kingsford Smith

Sun 9/13

8:45 pm-8:46 pm

1 stop17h 01m

$1,119

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 9/4

8:00 am-6:50 pm

1 stop17h 50m

Sydney Kingsford Smith

Sun 9/13

8:45 pm-8:46 pm

1 stop17h 01m

$1,128

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 7/26

5:32 pm-6:50 pm

1 stop32h 18m

Sydney Kingsford Smith

Tue 8/11

8:45 pm-8:50 pm

1 stop17h 05m

$1,133

Flights are sorted by cheapest round-trip 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?

In general, September is the cheapest month to fly from Portland to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $981. If you are unable to visit Sydney during the month of September, then departing from Portland during the month June is also very affordable. Most momondo users find prices during this month for around $1,117.

How far in advance should I book a flight from Portland 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 $1,206 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Portland for as low as $1,049 on momondo.

Can stopping save me money on Portland to Sydney flights?

You could potentially save up to 5% 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 June 2026, prices for Portland to Sydney flights are approximately 27% 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 round-trip 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

Fastest flight time

17h 45m

Direct flights

None
The fastest flight from Portland to Sydney takes 17h 45m
There are no direct flights from Portland to Sydney. There are no popular flight routes from Portland to Sydney.
Search flight deals

Frequently asked questions about flying from Portland to Sydney

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

    A flight from Portland to Sydney Kingsford Smith will travel around 7663.9 mi. A reasonable flight in good conditions will take 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 a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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 required for your trip to Sydney Kingsford Smith Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Sydney Kingsford Smith Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • 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
DeltaPriceFrom $497Free CancellationRating
7.8
8,425 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $550Free CancellationRating
7.8
2,826 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $830Free CancellationRating
7.4
9,875 reviews
Search United Airlines flights
Air CanadaPriceFrom $884Free CancellationRating
7.1
11,242 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $906Free CancellationRating
7.5
1,048 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $954Free CancellationRating
7.1
11,743 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $999Free CancellationRating
7.9
12,563 reviews
Search Alaska Airlines flights

Traveling to a place near Sydney?

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

Why use momondo?

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

Finding the right flight to Sydney from Portland is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Sydney quick and easy, saving you time and money.

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

Flights from Portland to Sydney with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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?

If you are not ready to book a flight from Portland to Sydney now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Sydney and let you know when they change.

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