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Cheap flights from Portland to Sydney from $780

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.
1 adult

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Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
16:26 - 09:20
PDX
-
SYD
21h 54m2 stops
Multiple Airlines Logo
11:20 - 13:41
SYD
-
PDX
21h 21m1 stop
$1,841Multiple Airlines
Thu, 1 Jan - Sat, 17 Jan
Air Canada Logo
09:50 - 09:35
PDX
-
SYD
28h 45m1 stop
Air Canada Logo
15:00 - 09:15
SYD
-
PDX
37h 15m2 stops
$1,843Air Canada
Sun, 1 Feb - Sat, 7 Feb
Multiple Airlines Logo
17:31 - 19:45
PDX
-
SYD
31h 14m2 stops
Multiple Airlines Logo
21:40 - 09:33
SYD
-
PDX
30h 53m2 stops
$1,844Multiple Airlines
Tue, 3 Feb - Fri, 6 Feb
Multiple Airlines Logo
14:57 - 07:25
PDX
-
SYD
21h 28m1 stop
Multiple Airlines Logo
14:00 - 16:50
SYD
-
PDX
21h 50m2 stops
$1,847Multiple Airlines
Mon, 2 Feb - Fri, 6 Feb
Multiple Airlines Logo
14:57 - 07:25
PDX
-
SYD
21h 28m1 stop
Multiple Airlines Logo
17:00 - 20:34
SYD
-
PDX
22h 34m2 stops
$1,850Multiple Airlines
Thu, 5 Feb - Mon, 9 Feb
Air Canada Logo
19:00 - 14:40
PDX
-
SYD
24h 40m2 stops
Air Canada Logo
09:00 - 09:15
SYD
-
PDX
19h 15m2 stops
$1,853Air Canada
Mon, 12 Jan - Fri, 23 Jan
Air Canada Logo
19:00 - 09:35
PDX
-
SYD
19h 35m1 stop
Air Canada Logo
11:20 - 14:40
SYD
-
PDX
22h 20m1 stop
$1,855Air Canada
Sat, 31 Jan - Tue, 3 Feb
Multiple Airlines Logo
17:50 - 19:45
PDX
-
SYD
30h 55m2 stops
Multiple Airlines Logo
21:40 - 23:32
SYD
-
PDX
20h 52m2 stops
$1,856Multiple Airlines
Wed, 4 Feb - Tue, 10 Feb
Qantas Airways Logo
14:57 - 13:55
PDX
-
SYD
27h 58m2 stops
Qantas Airways Logo
08:45 - 17:52
SYD
-
PDX
28h 07m2 stops
$1,858Qantas Airways
Thu, 8 Jan - Thu, 22 Jan
Multiple Airlines Logo
12:13 - 07:25
PDX
-
SYD
24h 12m1 stop
Multiple Airlines Logo
17:45 - 20:34
SYD
-
PDX
21h 49m1 stop
$1,862Multiple Airlines
Mon, 2 Feb - Sat, 7 Feb

Air Canada flights from Portland to Sydney

Our best Air Canada deals on Portland to Sydney flight tickets
Air Canada
1 Feb
PDX09:50Portland
28h 45m
1 stop
SYD09:35Sydney Kingsford Smith
7 Feb
SYD15:00Sydney Kingsford Smith
37h 15m
2 stops
PDX09:15Portland
$1,843
Find similar
Air Canada
12 Jan
PDX19:00Portland
24h 40m
2 stops
SYD14:40Sydney Kingsford Smith
23 Jan
SYD09:00Sydney Kingsford Smith
19h 15m
2 stops
PDX09:15Portland
$1,853
Find similar
Air Canada
31 Jan
PDX19:00Portland
19h 35m
1 stop
SYD09:35Sydney Kingsford Smith
3 Feb
SYD11:20Sydney Kingsford Smith
22h 20m
1 stop
PDX14:40Portland
$1,855
Find similar

Qantas Airways flights from Portland to Sydney

Our best Qantas Airways deals on Portland to Sydney flight tickets
Qantas Airways
8 Jan
PDX14:57Portland
27h 58m
2 stops
SYD13:55Sydney Kingsford Smith
22 Jan
SYD08:45Sydney Kingsford Smith
28h 07m
2 stops
PDX17:52Portland
$1,858
Find similar
Qantas Airways
29 Dec
PDX06:20Portland
31h 40m
1 stop
SYD09:00Sydney Kingsford Smith
13 Jan
SYD17:45Sydney Kingsford Smith
38h 50m
1 stop
PDX13:35Portland
$1,869
Find similar
Qantas Airways
5 Feb
PDX14:57Portland
26h 33m
2 stops
SYD12:30Sydney Kingsford Smith
12 Feb
SYD08:30Sydney Kingsford Smith
23h 55m
2 stops
PDX13:25Portland
$1,876
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 21 December 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

Thu 1/1

16:26-09:20

2 stops21h 54m

Sydney Kingsford Smith

Sat 17/1

11:20-13:41

1 stop21h 21m

$1,841

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 1/2

09:50-09:35

1 stop28h 45m

Sydney Kingsford Smith

Sat 7/2

15:00-09:15

2 stops37h 15m

$1,843

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 3/2

17:31-19:45

2 stops31h 14m

Sydney Kingsford Smith

Fri 6/2

21:40-09:33

2 stops30h 53m

$1,844

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 2/2

14:57-07:25

1 stop21h 28m

Sydney Kingsford Smith

Fri 6/2

14:00-16:50

2 stops21h 50m

$1,847

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 5/2

14:57-07:25

1 stop21h 28m

Sydney Kingsford Smith

Mon 9/2

17:00-20:34

2 stops22h 34m

$1,850

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 12/1

19:00-14:40

2 stops24h 40m

Sydney Kingsford Smith

Fri 23/1

09:00-09:15

2 stops19h 15m

$1,853

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sat 31/1

19:00-09:35

1 stop19h 35m

Sydney Kingsford Smith

Tue 3/2

11:20-14:40

1 stop22h 20m

$1,855

PortlandSydney

PDX - SYD

PDXSYD

Portland

Wed 4/2

17:50-19:45

2 stops30h 55m

Sydney Kingsford Smith

Tue 10/2

21:40-23:32

2 stops20h 52m

$1,856

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 8/1

14:57-13:55

2 stops27h 58m

Sydney Kingsford Smith

Thu 22/1

08:45-17:52

2 stops28h 07m

$1,858

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 2/2

12:13-07:25

1 stop24h 12m

Sydney Kingsford Smith

Sat 7/2

17:45-20:34

1 stop21h 49m

$1,862

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 $1,506. 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 $1,507.

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 $1,223. The most expensive day to fly to Sydney is Sunday, with ticket prices averaging around $1,987.

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 $1,373. 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 $1,781 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 $1,771 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 $1,356 on momondo.

Can stopping save me money on Portland to Sydney flights?

You could potentially save up to 15% 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 December 2025, prices for Portland to Sydney flights are approximately 44% 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

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

  • 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 $1,362Free cancellationRating
7.4
9,099 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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