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Cheap flights from Portland to Australia from $733

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 9/12. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — SYD
6 Dec — 13 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Portland to Australia

Enter your travel dates to find the best prices.

Cheapest flights from Portland to Australia
Explore the most affordable flight options available from Portland to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 November 2025.

Fri 26/1216:26PDX - BNE
1 stop19h 19mQantas Airways
Sun 11/105:05BNE - PDX
2 stops26h 36mQantas Airways
Deal found 5/11$1,645
Fri 14/1106:00PDX - BNE
1 stop29h 00mAmerican Airlines
Sun 16/1119:40BNE - PDX
1 stop20h 45mAmerican Airlines
Deal found 4/11$1,660
Sat 15/1111:40PDX - MEL
2 stops26h 50mAmerican Airlines
Sat 29/1112:00MEL - PDX
1 stop24h 12mAmerican Airlines
Deal found 5/11$1,702
Mon 15/1210:45PDX - BNE
1 stop27h 35mDelta
Wed 24/1211:05BNE - PDX
1 stop25h 10mDelta
Deal found 5/11$1,720
Thu 4/1215:15PDX - SYD
1 stop23h 20mAir Canada
Thu 11/1216:00SYD - PDX
1 stop21h 30mAir Canada
Deal found 4/11$1,722
Wed 3/1219:00PDX - SYD
1 stop40h 55mMultiple Airlines
Wed 10/1207:05SYD - PDX
2 stops21h 10mMultiple Airlines
Deal found 3/11$1,734
Sat 15/1111:40PDX - MEL
2 stops26h 50mAmerican Airlines
Sat 6/1213:30MEL - PDX
2 stops22h 58mAmerican Airlines
Deal found 5/11$1,747
Wed 26/1119:00PDX - SYD
1 stop19h 35mAir Canada
Mon 15/1216:00SYD - PDX
1 stop21h 30mAir Canada
Deal found 5/11$1,770
Thu 20/1106:00PDX - MEL
1 stop32h 30mAmerican Airlines
Tue 2/1206:00MEL - PDX
2 stops25h 57mAmerican Airlines
Deal found 4/11$1,773
Mon 3/1119:38PDX - BNE
1 stop17h 52mUnited Airlines
Sat 8/1111:40BNE - PDX
1 stop24h 56mUnited Airlines
Deal found 3/11$1,782
Mon 10/1119:00PDX - SYD
2 stops26h 40mAir Canada
Fri 12/1211:20SYD - PDX
1 stop16h 55mAir Canada
Deal found 4/11$1,784
Wed 10/1210:10PDX - MEL
1 stop28h 50mUnited Airlines
Mon 22/1213:00MEL - PDX
1 stop20h 46mUnited Airlines
Deal found 3/11$1,785

Cheap flight deals from Portland to Australia

Keep the following information in mind while searching for Portland to Australia flight deals. Data was last updated 6 November 2025.

Round-trip from

$1,335

One-way from

$733

Popular in

December

Cheapest in

September

Average price

$1,676
Air Canada
  • Air Canada
  • 5/3-19/3
  • 2 total stops
  • 41h 40m total
  • Portland to Australia
Search Deals
9/12
  • 9/12
  • 2 total stops
  • 30h 40m total
  • Portland to Australia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($249 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($66 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portland to Australia 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 6 November 2025.
Use the filters below to find and compare flights from Portland to Australia that are best for you.

Fly from

Portland

Fly to

Australia

Route

Depart

Return

Price

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Mon 16/3

13:00-07:20

1 stop25h 20m

Brisbane

Fri 20/3

09:40-11:53

1 stop19h 13m

$1,335

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Thu 5/3

19:00-08:45

1 stop19h 45m

Brisbane

Thu 19/3

09:45-14:40

1 stop21h 55m

$1,335

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Wed 18/3

19:00-07:45

1 stop19h 45m

Brisbane

Fri 3/4

10:00-14:40

1 stop21h 40m

$1,335

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Thu 5/3

19:00-13:25

2 stops24h 25m

Brisbane

Thu 19/3

09:45-14:40

1 stop21h 55m

$1,363

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Sat 14/2

15:15-14:35

2 stops28h 20m

Melbourne

Sat 28/2

07:10-14:40

2 stops26h 30m

$1,466

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Wed 18/3

15:50-05:00

1 stop20h 10m

Brisbane

Fri 3/4

20:05-22:36

1 stop19h 31m

$1,471

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Sat 21/2

14:40-05:00

1 stop20h 20m

Brisbane

Sun 1/3

17:10-16:28

1 stop17h 18m

$1,471

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Thu 19/3

19:00-13:15

2 stops24h 15m

Melbourne

Tue 24/3

06:30-09:15

2 stops20h 45m

$1,474

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Fri 27/2

14:50-11:40

2 stops25h 50m

Melbourne

Sun 15/3

12:00-22:36

1 stop28h 36m

$1,492

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Fri 27/2

21:30-09:30

1 stop41h 00m

Melbourne

Sun 15/3

12:00-13:21

1 stop19h 21m

$1,494

Flights are sorted by cheapest return flights first.

Deals found on 4/11

Showing 1-10 of 60 results
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Best time to book a flight from Portland to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia 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 Australia

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

Currently, December is the cheapest month in which you can book a flight from Portland to Australia (average of $702). Flying from Portland to Australia in July is currently the most expensive (average of $1,472). 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.

What is the cheapest time of day to fly from PDX to AU?

Find hourly flight availability from Portland to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 6 November 2025.

It’s optimal to fly from Portland to Australia at midday. By choosing this option you can save up to 18% on the cost of your flight, compared to a flight in the afternoon.

Reviews of airlines servicing Australia

Get insights into the airlines that provide service to Australia. 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 Australia. Reviews last updated 6 November 2025.
Check out reviews from past customers who have flown with United Airlines from Portland to Australia to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,004 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
9,004 reviews
United Airlines
7.4
Good
9,004 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Related info for your journey

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

  • What airport do you fly from for flights from Portland to Australia?

    If you book a flight to Australia from Portland, you will be flying from Portland, which is the city’s only airport. Portland (PDX) is located 9.7 km from the centre of Portland.

  • How long is the flight from Portland to Australia?

    Departing from Portland to Australia will take you 19h 45m. Portland and Australia are separated by a distance of 11719 km. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Portland to Australia one-way?

    The cheapet airlines for a one-way flight from Portland to Australia are Air Canada ($786), American Airlines ($793), and United Airlines ($816).

  • What are the most popular routes from Portland to Australia?

    When deciding which route to take from Portland to Australia, consider Portland - Sydney Kingsford Smith, Portland - Melbourne or Portland - Melbourne Avalon, as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portland to Australia 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 Australia?

    Currently, December is the cheapest month in which you can book a flight from Portland to Australia (average of $702). Flying from Portland to Australia in July is currently the most expensive (average of $1,472). 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

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Alternative routes for Portland to Australia

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

Top airline flying from Portland to Australia

Discover the top airline that operate flights from Portland to Australia. 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 6 November 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,280Average$1,977FlexibilityNo 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 Australia?

Cheapflights helps you search for flights from Portland to Australia via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights helps you find that perfect flight to Australia from Portland by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Yes, we can. To see specific flights from Portland to Australia with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

Yes, Cheapflights offers price alerts on Portland to Australia flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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