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Cheap flights from Portland to Sydney from $840

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 18/11. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — SYD
27 Aug — 3 Sep1
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
Explore the most affordable flight options available from Portland to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 July 2026.

Sun 9/815:30
PDX
-
SYD
1 stop22h 50m
Air Canada
Sun 23/809:20
SYD
-
PDX
1 stop17h 11m
Air Canada
Deal found 25/7$1,458
Tue 6/1019:45
PDX
-
SYD
1 stop18h 35m
Air Canada
Mon 19/1010:20
SYD
-
PDX
1 stop17h 11m
Air Canada
Deal found 26/7$1,499
Mon 12/1019:45
PDX
-
SYD
1 stop18h 35m
Air Canada
Tue 27/1010:20
SYD
-
PDX
1 stop17h 06m
Air Canada
Deal found 25/7$1,506
Sun 6/913:53
PDX
-
SYD
1 stop24h 12m
Qantas Airways
Sun 13/909:10
SYD
-
PDX
1 stop21h 15m
Qantas Airways
Deal found 24/7$1,524
Mon 3/817:08
PDX
-
SYD
1 stop20h 57m
Qantas Airways
Mon 17/817:50
SYD
-
PDX
1 stop23h 06m
Qantas Airways
Deal found 23/7$1,525
Sun 9/815:30
PDX
-
SYD
1 stop22h 50m
Multiple Airlines
Sun 23/806:00
SYD
-
PDX
2 stops20h 31m
Multiple Airlines
Deal found 25/7$1,526
Mon 10/819:45
PDX
-
SYD
1 stop18h 35m
Multiple Airlines
Wed 19/806:00
SYD
-
PDX
2 stops20h 31m
Multiple Airlines
Deal found 23/7$1,529
Mon 24/808:00
PDX
-
SYD
1 stop17h 50m
Multiple Airlines
Fri 28/813:15
SYD
-
PDX
2 stops39h 20m
Multiple Airlines
Deal found 23/7$1,532
Tue 29/915:30
PDX
-
SYD
1 stop22h 50m
Air Canada
Mon 2/1109:00
SYD
-
PDX
2 stops19h 26m
Air Canada
Deal found 24/7$1,535
Sat 21/1110:00
PDX
-
SYD
2 stops33h 40m
Air Canada
Sun 29/1111:20
SYD
-
PDX
1 stop17h 06m
Air Canada
Deal found 26/7$1,536
Mon 31/815:30
PDX
-
SYD
2 stops35h 10m
Air Canada
Sun 13/909:20
SYD
-
PDX
1 stop17h 11m
Air Canada
Deal found 23/7$1,538

Find flight deals from Portland to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 28 July 2026.

Round-trip from

$1,458

One-way from

$840

Popular in

December

Cheapest in

September

Average price

$1,922
Air Canada
  • Air Canada
  • 9/8-23/8
  • 2 total stops
  • 40h 01m total
  • Portland to Sydney
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 26/8
  • 1 total stop
  • 17h 50m total
  • Portland to Sydney
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($324 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($105 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights 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, Cheapflights users made 647,157 searches. Data last updated 28 July 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 return flight

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 6/10

19:45-15:55

2 stops26h 10m

Sydney Kingsford Smith

Mon 19/10

07:30-14:51

2 stops25h 21m

$1,559
Fastest return journey

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 23/11

19:26-09:20

1 stop18h 54m

Sydney Kingsford Smith

Mon 7/12

11:50-14:27

1 stop21h 37m

$1,565

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 31/8

12:45-07:00

2 stops25h 15m

Sydney Kingsford Smith

Sun 13/9

09:30-22:53

2 stops30h 23m

$1,572

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 22/11

09:00-09:05

2 stops29h 05m

Sydney Kingsford Smith

Sun 6/12

09:15-12:13

1 stop21h 58m

$1,572

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 3/9

10:50-07:00

2 stops27h 10m

Sydney Kingsford Smith

Sun 20/9

09:30-22:53

2 stops30h 23m

$1,642

PortlandSydney

PDX - SYD

PDXSYD

Portland

Wed 12/8

12:25-06:50

2 stops25h 25m

Sydney Kingsford Smith

Thu 3/9

09:15-19:44

2 stops27h 29m

$1,644

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 1/10

05:00-07:00

2 stops33h 00m

Sydney Kingsford Smith

Thu 8/10

10:30-18:31

3 stops26h 01m

$1,714

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 23/8

17:35-18:50

1 stop32h 15m

Sydney Kingsford Smith

Thu 3/9

20:45-13:10

2 stops33h 25m

$1,837

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 14/1

19:49-06:20

1 stop39h 31m

Sydney Kingsford Smith

Fri 12/2

13:20-12:25

1 stop18h 05m

$1,935

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 23/10

12:45-08:00

2 stops25h 15m

Sydney Kingsford Smith

Fri 30/10

09:15-18:24

3 stops27h 09m

$2,017

Flights are sorted by cheapest return flights first.

Deals found on 27/7

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

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
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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 54 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 $1,528). Flying from Portland to Sydney in December is currently the most expensive (average of $2,554). 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 $1,651 and $1,807 in August.
The cheapest return price found within the last 5 days was $1,458 on Air Canada (9 Aug–23 Aug).

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sydney. Reviews last updated 28 July 2026.
Read reviews from past customers who have flown with United Airlines 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.
United Airlines
7.4
Good
10,041 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
6.0
Good

ROHIT,June 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
United Airlines
7.4
Good
10,041 reviews
United Airlines
7.4
Good
10,041 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
6.0
Good

ROHIT,June 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this

Related info for your journey

Find useful and relevant information for your journey from Portland to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Portland to Sydney?

    Airlines like United Airlines fly from Portland to Sydney in about 18h 54m. The time it takes to get you to your destination can typically vary by up to . The distance from Portland to Sydney is about 12350 km.

  • What is the cheapest airline to fly from Portland to Sydney round-trip?

    Cheapflights users have booked flights from Portland to Sydney round-trip from $2,407.

  • 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 $1,528). Flying from Portland to Sydney in December is currently the most expensive (average of $2,554). 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
Katoomba
Manly
Lithgow
Cronulla
Terrigal
Randwick
Leura
Bondi Beach
Coogee

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Portland to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Boise to Sydney flights
Eugene to Sydney flights
Portland to Coolangatta flights

Top airline flying from Portland to Sydney

Discover the top airline that operate flights from Portland to Sydney. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 28 July 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$2,407Average$2,630FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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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