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Cheap flights from Portland to Australia from $358

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Australia departing on 3/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
5:30 am - 5:00 amPDX-MEL
28h 30m1 stop
American Airlines Logo
12:00 pm - 10:25 pmMEL-PDX
29h 25m1 stop
$936American Airlines
Find Deal
Fri, Nov 7 - Sat, Nov 22
Qantas Airways Logo
2:40 pm - 9:30 amPDX-MEL
23h 50m1 stop
Qantas Airways Logo
12:00 pm - 8:35 pmMEL-PDX
27h 35m1 stop
$952Qantas Airways
Find Deal
Tue, Feb 24 - Sat, Mar 7
Air Canada Logo
7:00 pm - 3:35 pmPDX-MEL
25h 35m2 stops
Air Canada Logo
7:10 am - 9:15 amMEL-PDX
20h 05m2 stops
$960Air Canada
Find Deal
Fri, Mar 6 - Sun, Mar 15
United Airlines Logo
7:45 pm - 10:00 amPDX-MEL
19h 15m1 stop
United Airlines Logo
1:00 pm - 12:33 pmMEL-PDX
18h 33m1 stop
$975United Airlines
Find Deal
Sat, Dec 27 - Sat, Jan 17
United Airlines Logo
7:30 pm - 7:30 amPDX-BNE
18h 00m1 stop
United Airlines Logo
10:40 am - 2:52 pmBNE-PDX
21h 12m1 stop
$978United Airlines
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Thu, Mar 5 - Thu, Mar 19
Alaska Airlines Logo
7:09 am - 7:45 pmPDX-SYD
17h 36m1 stop
Alaska Airlines Logo
9:40 pm - 5:34 amSYD-PDX
26h 54m1 stop
$979Alaska Airlines
Find Deal
Thu, Nov 13 - Tue, Nov 18
Alaska Airlines Logo
7:09 am - 7:45 pmPDX-SYD
17h 36m1 stop
Alaska Airlines Logo
9:40 pm - 6:00 amSYD-PDX
27h 20m2 stops
$989Alaska Airlines
Find Deal
Thu, Nov 13 - Tue, Nov 18
Delta Logo
5:05 pm - 8:00 amPDX-MEL
43h 55m2 stops
Delta Logo
10:00 am - 4:33 pmMEL-PDX
23h 33m2 stops
$1,025Delta
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Tue, Feb 24 - Sun, Jun 14
Delta Logo
7:55 pm - 8:00 amPDX-MEL
41h 05m1 stop
Delta Logo
10:00 am - 12:13 pmMEL-PDX
19h 13m1 stop
$1,026Delta
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Tue, Feb 24 - Sun, Jun 14
Air Canada Logo
9:50 am - 3:15 pmPDX-MEL
34h 25m2 stops
Air Canada Logo
7:10 am - 9:15 amMEL-PDX
21h 05m2 stops
$1,042Air Canada
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Sat, Feb 28 - Wed, Mar 4

Alaska Airlines flights from Portland to Australia

Our best Alaska Airlines deals on Portland to Australia flight tickets
Alaska Airlines
Nov 13
PDX7:09 amPortland
17h 36m
1 stop
SYD7:45 pmSydney Kingsford Smith
Nov 18
SYD9:40 pmSydney Kingsford Smith
26h 54m
1 stop
PDX5:34 amPortland
$979
Find similar
Alaska Airlines
Nov 13
PDX7:09 amPortland
17h 36m
1 stop
SYD7:45 pmSydney Kingsford Smith
Nov 18
SYD9:40 pmSydney Kingsford Smith
27h 20m
2 stops
PDX6:00 amPortland
$989
Find similar
Alaska Airlines
Oct 18
PDX7:50 amPortland
17h 55m
1 stop
SYD7:45 pmSydney Kingsford Smith
Oct 26
SYD9:40 pmSydney Kingsford Smith
18h 34m
1 stop
PDX10:14 pmPortland
$993
Find similar

Hawaiian Airlines flights from Portland to Australia

Our best Hawaiian Airlines deals on Portland to Australia flight tickets
Hawaiian Airlines
Nov 27
PDX5:41 pmPortland
31h 04m
1 stop
SYD7:45 pmSydney Kingsford Smith
Dec 4
SYD9:40 pmSydney Kingsford Smith
18h 10m
1 stop
PDX8:50 pmPortland
$983
Find similar
Hawaiian Airlines
Nov 12
PDX7:09 amPortland
17h 36m
1 stop
SYD7:45 pmSydney Kingsford Smith
Nov 20
SYD9:40 pmSydney Kingsford Smith
26h 45m
1 stop
PDX5:25 amPortland
$994
Find similar
Hawaiian Airlines
Nov 27
PDX5:41 pmPortland
31h 04m
1 stop
SYD7:45 pmSydney Kingsford Smith
Dec 4
SYD9:40 pmSydney Kingsford Smith
32h 10m
2 stops
PDX10:50 amPortland
$1,002
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated October 14, 2025.
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

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Fri 11/7

5:30 am-5:00 am

1 stop28h 30m

Melbourne

Sat 11/22

12:00 pm-10:25 pm

1 stop29h 25m

$936

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Tue 2/24

2:40 pm-9:30 am

1 stop23h 50m

Melbourne

Sat 3/7

12:00 pm-8:35 pm

1 stop27h 35m

$952

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Fri 3/6

7:00 pm-3:35 pm

2 stops25h 35m

Melbourne

Sun 3/15

7:10 am-9:15 am

2 stops20h 05m

$960

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Sat 12/27

7:45 pm-10:00 am

1 stop19h 15m

Melbourne

Sat 1/17

1:00 pm-12:33 pm

1 stop18h 33m

$975

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Thu 3/5

7:30 pm-7:30 am

1 stop18h 00m

Brisbane

Thu 3/19

10:40 am-2:52 pm

1 stop21h 12m

$978

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 11/13

7:09 am-7:45 pm

1 stop17h 36m

Sydney Kingsford Smith

Tue 11/18

9:40 pm-5:34 am

1 stop26h 54m

$979

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 11/13

7:09 am-7:45 pm

1 stop17h 36m

Sydney Kingsford Smith

Tue 11/18

9:40 pm-6:00 am

2 stops27h 20m

$989

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Tue 2/24

5:05 pm-8:00 am

2 stops43h 55m

Melbourne

Sun 6/14

10:00 am-4:33 pm

2 stops23h 33m

$1,025

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Tue 2/24

7:55 pm-8:00 am

1 stop41h 05m

Melbourne

Sun 6/14

10:00 am-12:13 pm

1 stop19h 13m

$1,026

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Sat 2/28

9:50 am-3:15 pm

2 stops34h 25m

Melbourne

Wed 3/4

7:10 am-9:15 am

2 stops21h 05m

$1,042

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Australia from

How to get the cheapest flight ticket from Portland to Australia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Australia?

The month of September is, on average, the cheapest month to fly to Australia from Portland, with most prices found around $993. If you aren’t able to travel during the month of September, then book flights to Australia from Portland during August instead. Flights to Australia in August, while not as cheap as those in September, still average around $1,002.

What is the cheapest day to depart on your flight to Australia?

The cheapest day to depart from Portland to Australia is on a Saturday. Travelers who choose to depart for Australia on a Saturday will often find tickets for as low as $1,040. On the other hand, Thursday is the most expensive day to depart from Portland because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,146.

What is the cheapest time of day to depart on your flight to Australia?

Flying to Australia from Portland in the morning is the least expensive time of day to depart. momondo users have found prices as low as $1,060 when looking at flights departing in the morning. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,135 on average. Flights to Australia from Portland at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Australia?

You are more likely to see cheaper flights to Australia from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to Australia for around $1,113 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Australia from Portland for as low as $1,018 on momondo.

Can stopping save me money on Portland to Australia flights?

You could potentially save up to 4% on your flight if you consider stops on a Portland to Australia flight.

Cheap Portland to Australia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to Australia

Direct flights

None
There are no direct flights from Portland to Australia. There are no popular flight routes from Portland to Australia.
Search flight deals

  • When did momondo last update prices for flights from Portland Airport to Australia?

    Prices for flights from Portland Airport to Australia refresh daily.

  • How many operators does momondo search for flights from Portland Airport to Australia?

  • How old do you have to be to fly from Portland Airport to Australia?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Portland Airport to Australia.

  • What documentation or ID do you need to fly to Australia?

    The necessary travel and health documents for your Australia trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Portland to Australia

Compare and see reviews for airlines that fly from Portland to Australia with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $456Free CancellationRating
7.9
7,972 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $550Free CancellationRating
7.8
2,779 reviews
Search Hawaiian Airlines flights
Air CanadaPriceFrom $840Free CancellationRating
7.1
10,294 reviews
Search Air Canada flights
United AirlinesPriceFrom $872Free CancellationRating
7.4
8,975 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $898Free CancellationRating
7.5
920 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $952Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $1,016Free CancellationRating
8.0
11,078 reviews
Search Alaska Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Portland to Australia?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Australia from Portland.

Can I find flights from Portland to Australia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Australia from Portland with this policy.

How can momondo help me find flights from Portland to Australia?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Australia from Portland.

I’m not ready to book a flight from Portland to Australia right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Portland to Australia flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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