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$539+ Cheap flights from Portland (PDX) to Sydney (SYD)

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 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to Sydney Kingsford Smith are usually found in September or August, booked 79 days in advance, depart on a Saturday or Sunday and return on a Wednesday

Cheap flight deals from Portland to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 17, 2025.

Round-trip from

$988
(Alaska Airlines)

One-way from

$539
(FlightHub)

Popular in

December

Cheapest in

September

Average price

$999
From Portland to Sydney Kingsford Smith
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One-way flight from Portland to Sydney Kingsford Smith
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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 Sydney

Cheapest flights from Portland to Sydney
Explore the most affordable flight options available from Portland to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This FlightHub 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 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 9/15$939
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.
Wed 9/178:31 amPDX - SYD
1 stop29h 34mAmerican Airlines
Wed 9/2412:10 pmSYD - PDX
1 stop26h 17mAmerican Airlines
Deal found 9/16$972
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 Alaska Airlines deal was found by Cheapflights users on 9/17. 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.
Wed 11/510:28 pmPDX - SYD
2 stops26h 17mAlaska Airlines
Tue 11/189:40 pmSYD - PDX
2 stops21h 29mAlaska Airlines
Deal found 9/17$988
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 9/238:31 amPDX - SYD
1 stop29h 34mAmerican Airlines
Tue 9/305:10 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.
Sun 9/2111:08 amPDX - SYD
2 stops26h 27mDelta
Wed 10/19:25 amSYD - PDX
2 stops22h 27mDelta
Deal found 9/15$992
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/175:01 pmPDX - SYD
1 stop20h 34mDelta
Wed 9/249:25 amSYD - PDX
2 stops31h 27mDelta
Deal found 9/16$993
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.
Sat 9/205:50 pmPDX - SYD
2 stops43h 45mDelta
Mon 9/299:25 amSYD - PDX
2 stops22h 27mDelta
Deal found 9/15$1,005
This Alaska Airlines deal was found by Cheapflights users on 9/17. 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.
Wed 11/510:28 pmPDX - SYD
2 stops26h 17mAlaska Airlines
Fri 11/219:40 pmSYD - PDX
2 stops31h 10mAlaska Airlines
Deal found 9/17$1,007
This Alaska Airlines deal was found by Cheapflights users on 9/17. 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.
Wed 11/510:28 pmPDX - SYD
2 stops26h 17mAlaska Airlines
Sat 11/229:40 pmSYD - PDX
2 stops31h 10mAlaska Airlines
Deal found 9/17$1,016

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to Sydney 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 17, 2025.
Use the filters below to find and compare flights from Portland to Sydney that are best for you.

Fly from

Portland

Fly to

Sydney

Route

Depart

Return

Price

PortlandSydney

PDX - SYD

PDXSYD

Portland

Wed 9/24

1:01 pm-7:00 am

2 stops24h 59m

Sydney Kingsford Smith

Tue 9/30

9:30 am-3:05 pm

2 stops22h 35m

$981

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 9/22

1:01 pm-7:00 am

2 stops24h 59m

Sydney Kingsford Smith

Tue 9/30

9:30 am-5:21 pm

2 stops24h 51m

$981

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 9/22

7:35 pm-6:55 am

1 stop18h 20m

Sydney Kingsford Smith

Mon 9/29

10:20 am-10:14 am

1 stop16h 54m

$981

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 9/21

3:44 pm-6:55 am

1 stop22h 11m

Sydney Kingsford Smith

Mon 9/29

10:20 am-2:42 pm

1 stop21h 22m

$981

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 9/23

11:08 am-6:35 am

2 stops26h 27m

Sydney Kingsford Smith

Tue 9/30

9:25 am-6:03 pm

2 stops25h 38m

$992

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 9/23

1:01 pm-7:00 am

2 stops24h 59m

Sydney Kingsford Smith

Tue 9/30

9:30 am-9:06 pm

2 stops28h 36m

$992

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sat 9/20

5:50 pm-6:35 am

2 stops43h 45m

Sydney Kingsford Smith

Wed 10/1

9:25 am-11:45 am

1 stop19h 20m

$1,005

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 9/25

1:40 pm-6:35 am

2 stops23h 55m

Sydney Kingsford Smith

Tue 9/30

9:25 am-11:45 am

1 stop19h 20m

$1,032

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 9/23

1:45 pm-6:55 am

1 stop24h 10m

Sydney Kingsford Smith

Thu 10/2

10:20 am-12:42 pm

1 stop19h 22m

$1,032

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 9/21

7:35 pm-6:55 am

1 stop18h 20m

Sydney Kingsford Smith

Thu 10/2

10:20 am-12:42 pm

1 stop19h 22m

$1,032

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 16 results
1
2

Best time to book a flight from Portland to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney 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 Sydney

How far ahead should I book a flight from Portland to Sydney?

Use this chart to determine the optimal time to book a round-trip flight from Portland to Sydney. Price data was last updated on September 12, 2025.

Booking 79 days in advance of your planned departure date is, on average, the best time to get cheap flights from Portland to Sydney. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Portland to Sydney?

Currently, March is the cheapest month in which you can book a flight from Portland to Sydney (average of $1,032). Flying from Portland to Sydney 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 SYD?

Find hourly flight availability from Portland to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

A simple way to save on the total cost of your ticket is to fly from Portland to Sydney in the morning. If you’re flexible enough to do this you can expect to save up to 7% on your trip compared to booking a flight at noon.

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

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

Travelers seeking maximum savings on their Portland to Sydney flight should consider departing on Saturday 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.

How much does it cost to fly round-trip from Portland to Sydney?

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. 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 Sydney. Reviews last updated September 17, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and Hawaiian Airlines from Portland to Sydney 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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
8.0
Very good
7,961 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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.
Hawaiian Airlines
7.8
Good
2,729 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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
8,926 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Comfort

7.8

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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 Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Portland to Sydney?

    For as low as $981, United Airlines can have you in Sydney from Portland in 24h 59m. There are 7674 mi between Portland and Sydney. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Portland to Sydney round-trip?

    Hawaiian Airlines, at $550, was found to be the cheapest airline from Portland to Sydney.Alternate airlines to your destination round-trip include Delta and Air Canada. Hawaiian Airlines is 51% cheaper than the average price of flights available within the next 90 days to this destination.

  • Where are the most common layover locations when flying from Portland to Sydney?

    The most popular layover on flights from Portland to Sydney is San Francisco.

  • What are some popular things to do or see while on a layover in San Francisco?

    If you're on a layover in San Francisco and looking for things to do, consider visiting Fisherman's Wharf, Union Square, or Bill Graham Civic Auditorium. Fisherman's Wharf, Union Square, and Bill Graham Civic Auditorium can be accessed by traveling approximately 13.0 mi, 11.6 mi, and 11.1 mi, respectively from San Francisco. Travelers can rent a car at San Francisco for an average daily rate of $56 to make sightseeing during their layover a little easier.

  • Where are the least popular layover locations for Portland to Sydney flights?

    Portland to Sydney flights that have layovers will least frequently stop in Los Angeles.

  • Can I find deals for flights from Portland to Sydney that include hotel bookings?

    Yes. In addition to deals on Portland to Sydney flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Sydney.

  • Can I find deals for business class flights from Portland to Sydney?

    Yes. Cheapflights offers flight deals from Portland to Sydney 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 Sydney?

    Currently, March is the cheapest month in which you can book a flight from Portland to Sydney (average of $1,032). Flying from Portland to Sydney 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

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Manly
Coogee

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Alternative routes for Portland to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Boise to Sydney flights
Medford to Sydney flights
Portland to Coolangatta flights
Eugene to Sydney flights
Redmond to Sydney flights

Top 7 airlines flying from Portland to Sydney

Discover the top 7 airlines that operate flights from Portland to Sydney. 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 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$550Average$1,167FlexibilityNo cancel feeOn-time85%
DeltaCheapest$610Average$1,068FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$841Average$1,073FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$898Average$1,345FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$912Average$1,078FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$954Average$1,052FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$1,099Average$1,235FlexibilityNo cancel feeOn-time75%

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