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Cheap flights from Portland to Sydney from $766

PDX — SYD
10 Oct — 17 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portland to Sydney

Enter your travel dates to find the best prices.

Cheapest flights from Portland to Sydney

Sun 15/1111:06 -
1 stop24h 19m
Mon 23/1114:00 -
2 stops39h 28m
Deal found 8/9$1,332
Tue 20/1014:30 -
1 stop23h 00m
Tue 27/1014:00 -
2 stops38h 44m
Deal found 5/9$1,448
Fri 20/1115:15 -
1 stop23h 20m
Sun 29/1111:20 -
1 stop26h 11m
Deal found 7/9$1,452
Thu 22/1011:06 -
1 stop26h 24m
Mon 26/1014:00 -
2 stops24h 33m
Deal found 5/9$1,461
Sun 15/1111:06 -
1 stop24h 19m
Sun 22/1114:00 -
2 stops24h 19m
Deal found 8/9$1,473
Mon 9/1115:15 -
1 stop23h 20m
Sat 28/1118:25 -
2 stops34h 01m
Deal found 6/9$1,474
Sat 14/1114:48 -
1 stop20h 37m
Mon 23/1114:00 -
2 stops39h 28m
Deal found 8/9$1,487
Sun 15/1111:06 -
1 stop24h 19m
Sat 21/1114:00 -
2 stops26h 20m
Deal found 8/9$1,491
Tue 17/1119:10 -
1 stop19h 25m
Tue 24/1111:20 -
1 stop17h 06m
Deal found 8/9$1,494
Tue 20/1019:45 -
1 stop18h 35m
Tue 27/1010:20 -
1 stop22h 21m
Deal found 5/9$1,497
Mon 26/1018:18 -
1 stop42h 07m
Mon 2/1114:00 -
2 stops23h 43m
Deal found 7/9$1,503

Find flight deals from Portland to Sydney

Round-trip from

$1,332

One-way from

$766

Popular in

December

Cheapest in

September

Average price

$1,481
15/11-23/11
  • 15/11-23/11
  • 3 total stops
  • 63h 47m total
  • Portland to Sydney
Search Deals
3/12-31/12
  • 3/12-31/12
  • 1 total stop
  • 23h 47m total
  • Portland to Sydney
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($373 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($103 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
Search Deals

Cheapflights Fare Finder

 
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 return flight

PortlandSydney

PDX Portland - SYD Sydney Kingsford Smith

PDXSYD

Portland

Wed 2/12

10:30-06:25

2 stops24h 55m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$818
Fastest return journey

PortlandSydney

PDX Portland - SYD Sydney Kingsford Smith

PDXSYD

Portland

Sun 1/11

19:15-09:35

1 stop19h 20m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$850

PortlandSydney

PDX Portland - SYD Sydney Kingsford Smith

PDXSYD

Portland

Thu 10/12

10:30-06:25

1 stop24h 55m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$940

PortlandSydney

PDX Portland - SYD Sydney Kingsford Smith

PDXSYD

Portland

Tue 15/9

13:53-07:05

1 stop24h 12m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$954

PortlandSydney

PDX Portland - SYD Sydney Kingsford Smith

PDXSYD

Portland

Wed 16/9

15:33-07:30

1 stop22h 57m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$954

PortlandSydney

PDX Portland - SYD Sydney Kingsford Smith

PDXSYD

Portland

Thu 31/12

14:30-06:25

1 stop20h 55m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$955

PortlandSydney

PDX Portland - SYD Sydney Kingsford Smith

PDXSYD

Portland

Tue 15/9

08:05-07:00

2 stops29h 55m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$975

PortlandSydney

PDX Portland - SYD Sydney Kingsford Smith

PDXSYD

Portland

Wed 16/9

05:00-07:00

2 stops33h 00m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$975

PortlandSydney

PDX Portland - SYD Sydney Kingsford Smith

PDXSYD

Portland

Thu 31/12

08:02-06:25

2 stops27h 23m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$1,015

PortlandSydney

PDX Portland - SYD Sydney Kingsford Smith

PDXSYD

Portland

Sat 23/1

19:49-06:20

1 stop39h 31m

Sydney Kingsford Smith

Mon 8/2

11:50-12:26

1 stop19h 36m

$1,807

Flights are sorted by cheapest return flights first.

Deals found on 8/9

Showing 1-10 of 21 resultsSorted by cheapest first
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2
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Best time to book a flight from Portland to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Portland with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from Portland to Sydney

How far ahead should I book a flight from Portland to Sydney?

The best time to book flights from Portland to Sydney is 74 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Portland to Sydney?

Currently, September is the cheapest month in which you can book a flight from Portland to Sydney (average of $1,481). Flying from Portland to Sydney in December is currently the most expensive (average of $2,535). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from Portland to Sydney?

Airfare is below average for this route at the moment.

Portland to Sydney flights typically cost between $1,343 and $1,722 in November.
The cheapest return price found within the last 5 days was $1,332 on Multiple Airlines (15 Nov–23 Nov).

Reviews of airlines servicing Sydney

Read reviews from past customers who have flown with Qantas Airways,United Airlines, andAir Canada from Portland to Sydney. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
1,091 reviews
Check prices

Crew

8.1

Boarding

7.7

Food

7.0

Comfort

7.4

Entertainment

7.2

Overall

7.5

Reviews

1 / 20
4.0
Okay

Robyn,Aug 2026

LAX - SYD

I was flabbergasted when the crew completely missed me in the distribution of food and drinks in Business Class - even after they looked twice at my opened table. However - this has happened to me on my last longhaul QF flight and with the same hosty (older woman with curly bob). She obviously cannot handly the stress of initial boarding as both times she has come back to me with an apology. When compared to our usual Business/ First longhauls with Qatar or Emirates, Qantas leave ALOT to be desired. I would highly recommend going with another airline. BTW I'm a 4th gen Aussie and previous Qantas employee - I would love to love them if they provided service but they just dont.
Qantas Airways
7.5
Good
1,091 reviews
Qantas Airways
7.5
Good
1,091 reviews
Check prices

Crew

8.1

Boarding

7.7

Food

7.0

Comfort

7.4

Entertainment

7.2

Overall

7.5

Reviews

1 / 20
4.0
Okay

Robyn,Aug 2026

LAX - SYD

I was flabbergasted when the crew completely missed me in the distribution of food and drinks in Business Class - even after they looked twice at my opened table. However - this has happened to me on my last longhaul QF flight and with the same hosty (older woman with curly bob). She obviously cannot handly the stress of initial boarding as both times she has come back to me with an apology. When compared to our usual Business/ First longhauls with Qatar or Emirates, Qantas leave ALOT to be desired. I would highly recommend going with another airline. BTW I'm a 4th gen Aussie and previous Qantas employee - I would love to love them if they provided service but they just dont.
United Airlines
7.4
Good
10,189 reviews
Qantas Airways
7.5
Good
1,091 reviews
Check prices

Crew

8.1

Boarding

7.7

Food

7.0

Comfort

7.4

Entertainment

7.2

Overall

7.5

Reviews

1 / 20
4.0
Okay

Robyn,Aug 2026

LAX - SYD

I was flabbergasted when the crew completely missed me in the distribution of food and drinks in Business Class - even after they looked twice at my opened table. However - this has happened to me on my last longhaul QF flight and with the same hosty (older woman with curly bob). She obviously cannot handly the stress of initial boarding as both times she has come back to me with an apology. When compared to our usual Business/ First longhauls with Qatar or Emirates, Qantas leave ALOT to be desired. I would highly recommend going with another airline. BTW I'm a 4th gen Aussie and previous Qantas employee - I would love to love them if they provided service but they just dont.
Air Canada
7.1
Good
11,608 reviews
Qantas Airways
7.5
Good
1,091 reviews
Check prices

Crew

8.1

Boarding

7.7

Food

7.0

Comfort

7.4

Entertainment

7.2

Overall

7.5

Reviews

1 / 20
4.0
Okay

Robyn,Aug 2026

LAX - SYD

I was flabbergasted when the crew completely missed me in the distribution of food and drinks in Business Class - even after they looked twice at my opened table. However - this has happened to me on my last longhaul QF flight and with the same hosty (older woman with curly bob). She obviously cannot handly the stress of initial boarding as both times she has come back to me with an apology. When compared to our usual Business/ First longhauls with Qatar or Emirates, Qantas leave ALOT to be desired. I would highly recommend going with another airline. BTW I'm a 4th gen Aussie and previous Qantas employee - I would love to love them if they provided service but they just dont.

Related info for your journey

  • How long is the flight from Portland to Sydney?

    Airlines like United Airlines and Delta fly from Portland to Sydney in about 20h 20m. The time it takes to get you to your destination can typically vary by up to 19h 11m. The distance from Portland to Sydney is about 12350 km. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines flying from Portland to Sydney round-trip?

    Cheapflights users have booked flights from Portland to Sydney round-trip from $1,229. Other airlines that can offer you cheap pricing are Qantas Airways, from $1,231, and United Airlines, from $2,331. You may be able to fly from Portland to Sydney for 29% less than the average price by searching for these airlines.

  • Can I find deals for flights from Portland to Sydney that include hotel bookings?

    Yes. In addition to deals on Portland to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Portland to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Sydney.

  • Can I find deals for business class flights from Portland to Sydney?

    Yes. Cheapflights offers flight deals from Portland to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Portland to Sydney?

    Currently, September is the cheapest month in which you can book a flight from Portland to Sydney (average of $1,481). Flying from Portland to Sydney in December is currently the most expensive (average of $2,535). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Sydney?

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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Portland to Sydney

Boise to Sydney flights
Eugene to Sydney flights
Portland to Coolangatta flights

Top 3 airlines flying from Portland to Sydney

AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$1,229Average$1,229FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Qantas AirwaysCheapest$1,231Average$1,785FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
United AirlinesCheapest$2,331Average$2,548FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

How does Cheapflights help users find flights from Portland to Sydney?

Deals for Portland to Sydney flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Portland to Sydney?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Portland to Sydney.

Can Cheapflights find flights from Portland to Sydney with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Portland to Sydney flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Portland to Sydney become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Sydney from Portland today and book when prices fit your budget.

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