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Cheap flights from Portland to Australia from $678

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 30/8. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — SYD
17 May — 24 May1
1 adult
1 adult, Economy, 0 bags

Cheap 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 17 April 2026.

Wed 13/515:30
PDX
-
BNE
1 stop22h 35m
Air Canada
Wed 27/510:00
BNE
-
PDX
1 stop26h 10m
Air Canada
Deal found 13/4$1,198
Mon 11/510:10
PDX
-
BNE
1 stop27h 55m
Air Canada
Tue 26/510:15
BNE
-
PDX
1 stop21h 30m
Air Canada
Deal found 12/4$1,200
Mon 27/409:50
PDX
-
BNE
1 stop28h 15m
Air Canada
Wed 13/510:00
BNE
-
PDX
1 stop16h 30m
Air Canada
Deal found 13/4$1,212
Thu 10/919:45
PDX
-
BNE
2 stops23h 20m
Multiple Airlines
Sun 27/910:00
BNE
-
PDX
1 stop26h 06m
Multiple Airlines
Deal found 13/4$1,237
Wed 13/510:10
PDX
-
BNE
1 stop27h 55m
Multiple Airlines
Wed 27/519:25
BNE
-
PDX
2 stops31h 05m
Multiple Airlines
Deal found 13/4$1,239
Mon 11/515:30
PDX
-
BNE
1 stop22h 35m
Multiple Airlines
Tue 26/520:40
BNE
-
PDX
2 stops29h 50m
Multiple Airlines
Deal found 12/4$1,241
Fri 25/919:45
PDX
-
BNE
2 stops23h 10m
Multiple Airlines
Sun 4/1010:00
BNE
-
PDX
1 stop21h 51m
Multiple Airlines
Deal found 12/4$1,252
Fri 8/519:45
PDX
-
MEL
2 stops22h 35m
Multiple Airlines
Thu 21/521:05
MEL
-
PDX
2 stops29h 25m
Multiple Airlines
Deal found 13/4$1,256
Fri 29/519:45
PDX
-
MEL
2 stops22h 35m
Multiple Airlines
Fri 5/606:00
MEL
-
PDX
2 stops20h 30m
Multiple Airlines
Deal found 13/4$1,258
Thu 28/515:30
PDX
-
MEL
2 stops26h 50m
Multiple Airlines
Thu 4/606:00
MEL
-
PDX
2 stops25h 45m
Multiple Airlines
Deal found 13/4$1,259
Mon 2/1119:10
PDX
-
BNE
2 stops24h 15m
Multiple Airlines
Mon 16/1106:10
BNE
-
PDX
2 stops21h 15m
Multiple Airlines
Deal found 12/4$1,262
Fri 19/619:45
PDX
-
BNE
2 stops23h 20m
Multiple Airlines
Fri 31/720:15
BNE
-
PDX
2 stops30h 16m
Multiple Airlines
Deal found 13/4$1,263

Find flight deals from Portland to Australia

Keep the following information in mind while searching for Portland to Australia flight deals. Data was last updated 17 April 2026.

Round-trip from

$1,198

One-way from

$678

Popular in

December

Cheapest in

September

Average price

$1,606
Air Canada
  • Air Canada
  • 13/5-27/5
  • 2 total stops
  • 48h 45m total
  • Portland to Australia
Search Deals
30/8
  • 30/8
  • 3 total stops
  • 39h 36m total
  • Portland to Australia
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($296 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($100 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
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 17 April 2026.
Use the filters below to find and compare flights from Portland to Australia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Fri 29/5

15:30-07:05

1 stop22h 35m

Brisbane

Fri 5/6

10:00-14:45

1 stop21h 45m

$1,304

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Sat 5/9

14:50-06:45

1 stop22h 55m

Melbourne

Sat 19/9

09:45-13:32

1 stop20h 47m

$1,548

PortlandMelbourne

PDX - AVV

PDXAVV

Portland

Sat 5/9

19:45-14:20

2 stops25h 35m

Melbourne Avalon

Sat 19/9

20:55-14:51

2 stops34h 56m

$1,550

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Fri 29/5

07:05-07:50

2 stops31h 45m

Melbourne

Fri 5/6

10:00-16:23

1 stop23h 23m

$1,580

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Thu 10/9

13:50-05:00

1 stop22h 10m

Brisbane

Sun 27/9

20:35-21:55

1 stop18h 20m

$1,620

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Sun 31/5

17:34-23:25

2 stops36h 51m

Brisbane

Sun 7/6

06:00-20:48

2 stops31h 48m

$1,669

PortlandPerth

PDX - PER

PDXPER

Portland

Mon 31/8

18:50-07:15

2 stops45h 25m

Perth

Mon 21/9

08:35-10:09

2 stops40h 34m

$1,673
Fastest return journey

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 15/5

08:00-18:50

1 stop17h 50m

Sydney Kingsford Smith

Tue 19/5

20:45-20:48

1 stop17h 03m

$1,681

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Tue 5/5

14:50-06:45

1 stop22h 55m

Melbourne

Sun 31/5

09:45-13:31

1 stop20h 46m

$1,687

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Sun 24/5

17:40-06:45

1 stop20h 05m

Melbourne

Sun 31/5

09:45-13:31

1 stop20h 46m

$1,687

Flights are sorted by cheapest return flights first.

Deals found on 16/4

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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, September is the cheapest month in which you can book a flight from Portland to Australia (average of $194). Flying from Portland to Australia in July is currently the most expensive (average of $1,147). 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.

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 17 April 2026.
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
9,602 reviews
Check prices

Crew

8.1

Food

6.6

Entertainment

7.1

Comfort

7.3

Overall

7.4

Boarding

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,602 reviews
United Airlines
7.4
Good
9,602 reviews
Check prices

Crew

8.1

Food

6.6

Entertainment

7.1

Comfort

7.3

Overall

7.4

Boarding

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

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 50m. Portland and Australia are separated by a distance of 12350 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, September is the cheapest month in which you can book a flight from Portland to Australia (average of $194). Flying from Portland to Australia in July is currently the most expensive (average of $1,147). 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

Browse thousands of different options on Cheapflights for your next trip

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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
Boise to Sydney flights
Portland to Brisbane 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 17 April 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$715Average$1,923FlexibilityNo 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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