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Cheap flights from Portland to Australia from $720

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 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — SYD
20 Dec — 27 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 20 November 2025.

Sun 23/1111:40PDX - BNE
2 stops23h 20mAmerican Airlines
Tue 25/1119:40BNE - PDX
1 stop20h 45mAmerican Airlines
Deal found 19/11$1,300
Mon 15/1205:00PDX - BNE
2 stops32h 30mUnited Airlines
Wed 24/1211:40BNE - PDX
2 stops40h 21mUnited Airlines
Deal found 17/11$1,345
Fri 5/1216:32PDX - SYD
1 stop18h 38mQantas Airways
Wed 10/1206:05SYD - PDX
2 stops33h 16mQantas Airways
Deal found 19/11$1,433
Sat 22/1110:05PDX - BNE
1 stop27h 25mUnited Airlines
Mon 24/1111:40BNE - PDX
1 stop24h 56mUnited Airlines
Deal found 18/11$1,464
Sun 23/1108:30PDX - BNE
2 stops29h 00mUnited Airlines
Tue 25/1111:40BNE - PDX
2 stops24h 12mUnited Airlines
Deal found 19/11$1,470
Thu 20/1107:00PDX - BNE
2 stops30h 30mUnited Airlines
Sat 22/1111:40BNE - PDX
1 stop26h 58mUnited Airlines
Deal found 16/11$1,472
Thu 20/1106:00PDX - MEL
1 stop32h 30mAmerican Airlines
Tue 2/1213:30MEL - PDX
2 stops22h 42mAmerican Airlines
Deal found 18/11$1,493
Fri 28/1117:42PDX - MEL
1 stop20h 48mAmerican Airlines
Wed 3/1212:30MEL - PDX
2 stops23h 58mAmerican Airlines
Deal found 18/11$1,512
Mon 8/1205:41PDX - SYD
1 stop30h 44mQantas Airways
Mon 12/119:15SYD - PDX
2 stops37h 26mQantas Airways
Deal found 19/11$1,553
Mon 29/1216:26PDX - SYD
2 stops21h 54mQantas Airways
Tue 13/121:25SYD - PDX
1 stop18h 23mQantas Airways
Deal found 19/11$1,559
Sun 30/1119:00PDX - SYD
1 stop19h 35mAir Canada
Sun 21/1211:20SYD - PDX
1 stop26h 10mAir Canada
Deal found 19/11$1,615
Wed 26/1109:50PDX - SYD
1 stop28h 45mAir Canada
Mon 15/1209:00SYD - PDX
2 stops19h 15mAir Canada
Deal found 18/11$1,638

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 20 November 2025.

Round-trip from

$1,151

One-way from

$720

Popular in

December

Cheapest in

September

Average price

$1,618
Air Canada
  • Air Canada
  • 5/3-19/3
  • 2 total stops
  • 40h 00m total
  • Portland to Australia
Search Deals
4/3
  • 4/3
  • 2 total stops
  • 23h 45m total
  • Portland to Australia
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($278 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($87 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 20 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

Thu 5/3

19:00-08:45

1 stop19h 45m

Brisbane

Thu 19/3

09:45-09:15

1 stop16h 30m

$1,188

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Thu 5/3

19:49-07:30

1 stop17h 41m

Brisbane

Sat 21/3

10:40-15:04

1 stop21h 24m

$1,323

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Mon 2/3

17:10-08:20

1 stop21h 10m

Brisbane

Fri 20/3

09:40-18:18

2 stops25h 38m

$1,323

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Mon 2/3

17:10-08:20

1 stop21h 10m

Brisbane

Sun 22/3

09:40-11:53

1 stop19h 13m

$1,323

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Mon 2/3

13:40-07:30

1 stop23h 50m

Brisbane

Mon 16/3

10:40-14:59

1 stop21h 19m

$1,323

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Wed 4/3

13:18-07:30

2 stops24h 12m

Brisbane

Mon 16/3

10:40-14:59

1 stop21h 19m

$1,323

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Fri 6/3

13:30-08:20

2 stops24h 50m

Brisbane

Sun 22/3

09:40-13:14

2 stops20h 34m

$1,323

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Mon 2/3

13:40-07:30

1 stop23h 50m

Brisbane

Tue 17/3

10:40-14:59

1 stop21h 19m

$1,323

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Wed 4/3

19:52-08:20

1 stop18h 28m

Brisbane

Sun 22/3

09:40-16:31

2 stops23h 51m

$1,323

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Sun 8/3

08:30-06:30

2 stops29h 00m

Brisbane

Sat 21/3

10:40-12:33

1 stop18h 53m

$1,323

Flights are sorted by cheapest return flights first.

Deals found on 17/11

Showing 1-10 of 48 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 $703). Flying from Portland to Australia in January 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 20 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 20 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
9,025 reviews
Check prices

Crew

8.1

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

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
9,025 reviews
United Airlines
7.4
Good
9,025 reviews
Check prices

Crew

8.1

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

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 17h 41m. Portland and Australia are separated by a distance of 11719 km. This flight may include one or multiple stops.

  • 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 - Brisbane, 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 $703). Flying from Portland to Australia in January 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
Portland to Perth flights
Boise to Sydney 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 20 November 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,282Average$1,980FlexibilityNo 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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