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$539+ Cheap flights from Portland (PDX) to Australia

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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — SYD
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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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 September 16, 2025.

Round-trip from

$973
(United Airlines)

One-way from

$539
(FlightHub)

Popular in

December

Cheapest in

September

Average price

$999
From Portland to Australia
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One-way flight from Portland to Australia
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Highest demand for flights based on searches. 8% potential increase in price ($105 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($26 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Portland to Australia

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 September 16, 2025.

This FlightHub deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/232:50 pmPDX - SYD
1 stop23h 15mQantas Airways
Tue 9/309:10 amSYD - PDX
1 stop21h 14mQantas Airways
Deal found 9/14$939
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:30 amPDX - BNE
1 stop30h 00mUnited Airlines
Sat 1/1711:40 amBNE - PDX
1 stop29h 26mUnited Airlines
Deal found 9/14$973
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/158:31 amPDX - SYD
1 stop29h 34mAmerican Airlines
Mon 9/299:10 amSYD - PDX
1 stop29h 06mAmerican Airlines
Deal found 9/14$973
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/316:00 amPDX - MEL
2 stops32h 30mUnited Airlines
Fri 11/71:00 pmMEL - PDX
1 stop24h 36mUnited Airlines
Deal found 9/16$976
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/235:15 pmPDX - BNE
1 stop20h 15mUnited Airlines
Fri 10/3110:40 amBNE - PDX
1 stop26h 58mUnited Airlines
Deal found 9/13$978
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/311:00 pmPDX - BNE
1 stop24h 30mUnited Airlines
Fri 11/711:40 amBNE - PDX
1 stop21h 06mUnited Airlines
Deal found 9/16$979
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/57:10 pmPDX - MEL
2 stops43h 50mUnited Airlines
Fri 11/1411:30 amMEL - PDX
2 stops28h 56mUnited Airlines
Deal found 9/16$981
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/221:01 pmPDX - SYD
2 stops24h 59mUnited Airlines
Mon 9/299:30 amSYD - PDX
2 stops22h 35mUnited Airlines
Deal found 9/15$981
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/151:01 pmPDX - SYD
2 stops24h 59mUnited Airlines
Mon 9/2910:20 amSYD - PDX
1 stop29h 25mUnited Airlines
Deal found 9/14$982
This Alaska Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1610:40 amPDX - SYD
1 stop40h 05mAlaska Airlines
Tue 9/239:40 pmSYD - PDX
2 stops25h 18mAlaska Airlines
Deal found 9/15$990
This American Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/168:31 amPDX - SYD
1 stop29h 34mAmerican Airlines
Tue 9/235:10 pmSYD - PDX
2 stops21h 06mAmerican Airlines
Deal found 9/16$991
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2311:08 amPDX - SYD
2 stops26h 27mDelta
Tue 9/309:25 amSYD - PDX
2 stops25h 38mDelta
Deal found 9/15$992

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated September 16, 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 12/25

7:30 am-7:30 am

1 stop30h 00m

Brisbane

Fri 1/16

11:40 am-12:43 am

1 stop31h 03m

$973

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Thu 12/25

5:00 am-7:30 am

2 stops32h 30m

Brisbane

Sat 1/17

11:40 am-12:43 am

1 stop31h 03m

$973

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Thu 3/5

5:45 am-9:30 am

2 stops32h 45m

Melbourne

Sat 3/14

10:30 am-12:19 am

2 stops31h 49m

$976

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Thu 3/5

7:30 pm-10:00 am

1 stop19h 30m

Melbourne

Fri 3/13

12:00 pm-8:05 pm

1 stop26h 05m

$976

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Fri 3/6

7:30 pm-10:00 am

1 stop19h 30m

Melbourne

Sat 3/14

10:30 am-12:19 am

2 stops31h 49m

$976

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Fri 3/13

3:41 pm-9:00 am

1 stop23h 19m

Melbourne

Thu 3/26

12:00 pm-2:42 pm

1 stop20h 42m

$976

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Sat 1/17

7:51 pm-10:00 am

1 stop19h 09m

Melbourne

Sat 1/24

1:00 pm-2:46 pm

1 stop20h 46m

$976

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Sat 2/21

3:50 pm-7:30 am

1 stop21h 40m

Brisbane

Sat 3/14

10:40 am-8:05 pm

1 stop26h 25m

$978

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Sat 2/14

1:32 pm-7:30 am

1 stop23h 58m

Brisbane

Sat 2/21

11:40 am-6:47 pm

1 stop25h 07m

$978

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Thu 10/23

3:50 pm-6:30 am

1 stop21h 40m

Brisbane

Fri 10/31

10:40 am-8:38 pm

1 stop26h 58m

$978

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

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 round-trip 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, March is the cheapest month in which you can book a flight from Portland to Australia (average of $1,032). Flying from Portland to Australia in December is currently the most expensive (average of $1,627). 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 September 16, 2025.

When flying from Portland to Australia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 September 16, 2025.
See what other customers who have flown with Alaska Airlines, Delta, and Qantas Airways from Portland to Australia have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Delta
8.0
Very good
7,957 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Qantas Airways
7.5
Good
907 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,924 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Air Canada
7.1
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

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?

    For a flight from Portland to Australia, you will be flying from Portland. Portland (PDX) is just 6.0 mi from the center of the city.

  • How long is the flight from Portland to Australia?

    For as low as $1,131, United Airlines can have you in Australia from Portland in 20h 49m. Airlines will cover a distance of 7674 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    To fly one-way, consider booking your trip with Qantas Airways, which is currently one of the cheapest options available, starting at $539. Delta flights start at $570 while deals on United Airlines start at $707 one-way.

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

    The most popular flight routes from Portland to Australia are Portland - Melbourne, Portland - Sydney Kingsford Smith and Portland - Melbourne Avalon.

  • 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 vacation 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, March is the cheapest month in which you can book a flight from Portland to Australia (average of $1,032). Flying from Portland to Australia in December is currently the most expensive (average of $1,627). 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.
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Portland to Majuro flights

Top 7 airlines flying from Portland to Australia

Discover the top 7 airlines 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 2,558,603 searches. Data last updated September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$456Average$1,128FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$550Average$1,167FlexibilityNo cancel feeOn-time85%
Air CanadaCheapest$841Average$1,279FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$872Average$1,265FlexibilityNo cancel feeOn-time69%
Qantas AirwaysCheapest$898Average$1,534FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$954Average$1,052FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$1,099Average$1,235FlexibilityNo cancel feeOn-time75%

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