£312 Cheap Flights from Portland (PDX) to Sydney (SYD)

View £312 flight on Thu, 18 Sep 2025Opens in a new window

Popular airlines from Portland International Airport (PDX) to Sydney Airport (SYD)

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Cheap Flights from Portland (PDX) to Sydney (SYD)

Prices were available within the past 7 days and start at £312 for one-way flights and £623 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Tue, 9 Sep - Tue, 30 Sep
PDX
Portland
SYD
Sydney
£623 Return, just found
£623
Return
just found
Select Alaska Airlines flight, departing Tue, 9 Sep from Portland to Sydney, returning Tue, 30 Sep, priced at £623 just found
Qantas Airways
Tue, 9 Sep - Tue, 30 Sep
PDX
Portland
SYD
Sydney
£633 Return, just found
£633
Return
just found
Select Qantas Airways flight, departing Tue, 9 Sep from Portland to Sydney, returning Tue, 30 Sep, priced at £633 just found
Qantas Airways
Tue, 9 Sep - Tue, 30 Sep
PDX
Portland
SYD
Sydney
£633 Return, just found
£633
Return
just found
Select Qantas Airways flight, departing Tue, 9 Sep from Portland to Sydney, returning Tue, 30 Sep, priced at £633 just found
Qantas Airways
Tue, 9 Sep - Tue, 30 Sep
PDX
Portland
SYD
Sydney
£643 Return, just found
£643
Return
just found
Select Qantas Airways flight, departing Tue, 9 Sep from Portland to Sydney, returning Tue, 30 Sep, priced at £643 just found
Alaska Airlines
Fri, 1 Aug - Thu, 14 Aug
PDX
Portland
SYD
Sydney
£845 Return, found 4 days ago
£845
Return
found 4 days ago
Select Alaska Airlines flight, departing Fri, 1 Aug from Portland to Sydney, returning Thu, 14 Aug, priced at £845 found 4 days ago
Alaska Airlines
Tue, 9 Sep - Tue, 30 Sep
PDX
Portland
SYD
Sydney
£851 Return, just found
£851
Return
just found
Select Alaska Airlines flight, departing Tue, 9 Sep from Portland to Sydney, returning Tue, 30 Sep, priced at £851 just found
Alaska Airlines
Tue, 9 Sep - Tue, 30 Sep
PDX
Portland
SYD
Sydney
£920 Return, just found
£920
Return
just found
Select Alaska Airlines flight, departing Tue, 9 Sep from Portland to Sydney, returning Tue, 30 Sep, priced at £920 just found
Hawaiian Airlines
Tue, 9 Sep - Tue, 30 Sep
PDX
Portland
SYD
Sydney
£1,080 Return, just found
£1,080
Return
just found
Select Hawaiian Airlines flight, departing Tue, 9 Sep from Portland to Sydney, returning Tue, 30 Sep, priced at £1,080 just found
All Nippon Airways
Tue, 9 Sep - Tue, 30 Sep
PDX
Portland
SYD
Sydney
£1,227 Return, just found
£1,227
Return
just found
Select All Nippon Airways flight, departing Tue, 9 Sep from Portland to Sydney, returning Tue, 30 Sep, priced at £1,227 just found
Air New Zealand
Thu, 25 Dec - Sat, 10 Jan
PDX
Portland
SYD
Sydney
£1,450 Return, found 4 days ago
£1,450
Return
found 4 days ago
Select Air New Zealand flight, departing Thu, 25 Dec from Portland to Sydney, returning Sat, 10 Jan, priced at £1,450 found 4 days ago

Find the cheapest month to fly from Portland (PDX) to Sydney (SYD)

September is typically the cheapest month to fly

From £581 - £1,300 per traveller.

Graph displaying average flight prices per month

Flight from Portland to Sydney route information
Origin airport
Portland Intl.
Destination airport
Kingsford Smith Intl.
Return price
£623
Distance
12286 km

Compare flights from Portland to Sydney easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Portland to Sydney. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Kingsford Smith Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Portland Intl. to Kingsford Smith Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Portland Intl. (PDX) to Kingsford Smith Intl. (SYD)

The easiest way to view the best deals on flights from Portland to Sydney today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Portland Intl. to Kingsford Smith Intl. start at just £623 and range up to £1,450.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Portland and Sydney
  • booking your flight during September, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Portland to Sydney flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Portland Intl. to Kingsford Smith Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Frequently asked questions

How much is a flight from PDX Airport to SYD?
Start packing your suitcase, because round-trip flights between Portland Intl. Airport (PDX) and Kingsford Smith Intl. Airport (SYD) start from £623. That's based on fares listed within the last 7 days on Expedia for flights departing within the next year. Prices can move quickly, so book today to nab the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from PDX Airport to Kingsford Smith Intl. Airport (SYD)?
The majority of flights can be cancelled online, but every airline has its own terms and conditions. If you do have to cancel your flight, go to our Customer Service Portal and follow the instructions.
How do I find cheap flights from Portland Intl. Airport (PDX) to SYD that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for PDX to Mascot Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Portland Intl. Airport (PDX) to SYD?
The distance is around 12,400 kilometres, so pack your carry-on bag with all the items you need to make your journey comfortable. Wondering what to take on board your Portland to Sydney flight? A neck pillow, earplugs and a sleep mask are among the essentials.
Which airlines fly direct from Portland Intl. Airport (PDX) to Sydney Airport?
You won't find any airlines operating directly between PDX Airport and Kingsford Smith Intl. Airport (SYD), so be prepared to make at least one stop on your journey. A layover, whether short or long, can be a nice way to break up a trip!
Are PDX Airport to Sydney Airport flight tickets cheaper when they're purchased at the last minute?
Booking last minute from PDX Airport to Sydney Airport can be hit-or-miss. You might be lucky and score a bargain, but then again, you could miss out altogether! If you'd rather start planning early on, Expedia compares flight deals up to a year in advance. Just remember that not all airlines release their prices so far in advance. Our top tip? Check back often as prices are updated regularly.

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