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$360+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — SYD
Nov 19 — Nov 261
Wed 11/19
Wed 11/26
1 adult, Economy
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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 October 20, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 10/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/257:00 amPDX - MEL
1 stop29h 45mQantas Airways
Sat 11/812:00 pmMEL - PDX
1 stop20h 50mQantas Airways
Deal found 10/20$932
This Qantas Airways deal was found by Cheapflights users on 10/18. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/182:52 pmPDX - BNE
1 stop21h 33mMultiple Airlines
Sat 11/87:40 pmBNE - PDX
1 stop19h 10mMultiple Airlines
Deal found 10/18$954
This oojo deal was found by Cheapflights users on 10/18. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/269:45 pmPDX - MEL
1 stop40h 45mMultiple Airlines
Sat 1/1012:00 pmMEL - PDX
1 stop20h 41mMultiple Airlines
Deal found 10/18$970
This Cheapflightsfares deal was found by Cheapflights users on 10/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/235:55 pmPDX - SYD
1 stop18h 10mQantas Airways
Sat 10/256:10 pmSYD - PDX
2 stops23h 14mQantas Airways
Deal found 10/19$976
This SmartFares deal was found by Cheapflights users on 10/18. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1110:25 amPDX - SYD
1 stop38h 20mAlaska Airlines
Tue 11/189:40 pmSYD - PDX
1 stop26h 54mAlaska Airlines
Deal found 10/18$993
This Alaska Airlines deal was found by Cheapflights users on 10/19. 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.
Mon 11/107:09 amPDX - SYD
1 stop17h 36mAlaska Airlines
Fri 12/129:40 pmSYD - PDX
2 stops27h 20mAlaska Airlines
Deal found 10/19$998
This United Airlines deal was found by Cheapflights users on 10/20. 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.
Tue 12/303:54 pmPDX - MEL
1 stop23h 06mUnited Airlines
Wed 1/141:00 pmMEL - PDX
1 stop20h 48mUnited Airlines
Deal found 10/20$1,014
This Hawaiian Airlines deal was found by Cheapflights users on 10/18. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1110:25 amPDX - SYD
1 stop38h 20mHawaiian Airlines
Tue 11/189:40 pmSYD - PDX
1 stop26h 54mHawaiian Airlines
Deal found 10/18$1,015
This United Airlines deal was found by Cheapflights users on 10/20. 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 12/410:10 amPDX - MEL
1 stop28h 50mUnited Airlines
Thu 12/111:00 pmMEL - PDX
1 stop30h 37mUnited Airlines
Deal found 10/20$1,020
This Delta deal was found by Cheapflights users on 10/19. 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.
Wed 12/310:45 amPDX - MEL
1 stop26h 15mDelta
Wed 12/1010:10 amMEL - PDX
1 stop27h 49mDelta
Deal found 10/19$1,021
This Qantas Airways deal was found by Cheapflights users on 10/20. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/294:26 pmPDX - MEL
1 stop22h 04mQantas Airways
Sat 1/1712:00 pmMEL - PDX
1 stop23h 49mQantas Airways
Deal found 10/20$1,022
This United Airlines deal was found by Cheapflights users on 10/20. 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 12/2911:59 pmPDX - MEL
2 stops38h 31mUnited Airlines
Tue 1/131:00 pmMEL - PDX
1 stop24h 41mUnited Airlines
Deal found 10/20$1,035

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 October 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$950
(Air Canada)

One-way from

$360
(Flightnetwork)

Popular in

December

Cheapest in

September

Average price

$1,137
Provider with most accurate pricing for Portland-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Sydney Kingsford Smith flights.
Search Deals
From Portland to Australia
Search Deals
One-way flight from Portland to Australia
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($95 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 20, 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

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Fri 12/26

9:45 pm-9:30 am

1 stop40h 45m

Melbourne

Sat 1/10

12:00 pm-1:41 pm

1 stop20h 41m

$970

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Tue 12/30

7:45 pm-10:00 am

1 stop19h 15m

Melbourne

Tue 1/13

1:00 pm-6:41 pm

1 stop24h 41m

$1,014

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Sun 12/28

3:54 pm-10:00 am

1 stop23h 06m

Melbourne

Sat 1/17

1:00 pm-12:33 pm

1 stop18h 33m

$1,014

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Tue 12/30

3:54 pm-10:00 am

1 stop23h 06m

Melbourne

Thu 1/15

1:00 pm-6:48 pm

1 stop24h 48m

$1,014

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Tue 12/30

3:54 pm-10:00 am

1 stop23h 06m

Melbourne

Sat 1/17

1:00 pm-12:33 pm

1 stop18h 33m

$1,014

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Sun 12/28

3:54 pm-10:00 am

1 stop23h 06m

Melbourne

Wed 1/14

1:00 pm-12:33 pm

1 stop18h 33m

$1,014

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Tue 12/30

3:54 pm-10:00 am

1 stop23h 06m

Melbourne

Wed 1/14

1:00 pm-12:33 pm

1 stop18h 33m

$1,014

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Sun 12/28

3:54 pm-10:00 am

1 stop23h 06m

Melbourne

Fri 1/16

1:00 pm-6:10 pm

2 stops24h 10m

$1,018

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Sun 1/4

9:00 am-10:00 am

2 stops30h 00m

Melbourne

Sun 1/18

1:00 pm-6:10 pm

2 stops24h 10m

$1,018

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Tue 11/11

7:40 am-6:30 am

1 stop28h 50m

Brisbane

Tue 11/18

9:40 am-1:08 pm

1 stop21h 28m

$1,048

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/20

Showing 1-10 of 57 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, December is the cheapest month in which you can book a flight from Portland to Australia (average of $456). Flying from Portland to Australia in July is currently the most expensive (average of $956). 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 October 20, 2025.

It’s typically best to fly out from Portland to Australia in the evening. Doing so could potentially save you 5% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from Portland to Australia?

Use this chart to determine the cheapest time to fly round-trip from Portland to Australia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Portland to Australia flight should consider departing on Sunday mornings when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 20, 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
11,136 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Alaska Airlines
8.0
Very good
11,136 reviews
Alaska Airlines
8.0
Very good
11,136 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Delta
7.9
Good
7,978 reviews
Alaska Airlines
8.0
Very good
11,136 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Qantas Airways
7.5
Good
922 reviews
Alaska Airlines
8.0
Very good
11,136 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
United Airlines
7.4
Good
8,991 reviews
Alaska Airlines
8.0
Very good
11,136 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Air Canada
7.1
Good
10,335 reviews
Alaska Airlines
8.0
Very good
11,136 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.

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 $1,079, United Airlines can have you in Australia from Portland in 17h 36m. 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 ANA, which is currently one of the cheapest options available, starting at $360. Air Canada flights start at $505 while deals on Qantas Airways start at $557 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, December is the cheapest month in which you can book a flight from Portland to Australia (average of $456). Flying from Portland to Australia in July is currently the most expensive (average of $956). 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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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 October 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$456Average$1,119FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$550Average$1,161FlexibilityNo cancel feeOn-time85%
Air CanadaCheapest$840Average$1,220FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$872Average$1,243FlexibilityNo cancel feeOn-time69%
Qantas AirwaysCheapest$898Average$1,503FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$952Average$974FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$999Average$1,208FlexibilityNo cancel feeOn-time75%

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