Find flights
When to book
Airlines
FAQs

Cheap flights from Portland to Sydney from $543

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 2/12. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — SYD
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Portland to Sydney Kingsford Smith are usually found in September or August, booked 39 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

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 30 October 2025.

Round-trip from

$1,513

One-way from

$543

Popular in

December

Cheapest in

September

Average price

$1,724
Alaska Airlines
  • Alaska Airlines
  • 26/2-10/3
  • 2 total stops
  • 35h 45m total
  • Portland to Sydney
Search Deals
ANA
  • ANA
  • 29/11
  • 2 total stops
  • 39h 25m total
  • Portland to Sydney
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($218 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($56 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find flight deals from Portland to Sydney

Enter your travel dates to find the best prices.

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 30 October 2025.

Tue 25/1110:30PDX - SYD
1 stop38h 15mAlaska Airlines
Tue 2/1221:40SYD - PDX
2 stops27h 20mAlaska Airlines
Deal found 26/10$1,539
Tue 18/1119:00PDX - SYD
1 stop19h 35mAir Canada
Tue 25/1111:20SYD - PDX
1 stop22h 20mAir Canada
Deal found 28/10$1,566
Wed 26/1119:00PDX - SYD
1 stop19h 35mAir Canada
Wed 3/1208:30SYD - PDX
2 stops19h 45mAir Canada
Deal found 29/10$1,589
Fri 14/1119:00PDX - SYD
1 stop19h 35mAir Canada
Thu 27/1111:20SYD - PDX
1 stop26h 10mAir Canada
Deal found 28/10$1,701
Tue 25/1109:50PDX - SYD
2 stops39h 25mMultiple Airlines
Tue 2/1211:20SYD - PDX
1 stop16h 55mMultiple Airlines
Deal found 28/10$1,703
Wed 26/1119:00PDX - SYD
1 stop19h 35mAir Canada
Mon 15/1219:15SYD - PDX
2 stops38h 25mAir Canada
Deal found 27/10$1,712
Tue 25/1114:50PDX - SYD
2 stops33h 55mHawaiian Airlines
Tue 2/1221:40SYD - PDX
2 stops27h 20mHawaiian Airlines
Deal found 26/10$1,713
Mon 17/1113:21PDX - SYD
1 stop23h 04mMultiple Airlines
Tue 2/1217:45SYD - PDX
1 stop21h 36mMultiple Airlines
Deal found 27/10$1,725
Sun 23/1122:30PDX - SYD
2 stops50h 45mMultiple Airlines
Sat 6/1221:40SYD - PDX
1 stop37h 42mMultiple Airlines
Deal found 27/10$1,728

Cheapflights Fare Finder

 
Customise 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 647,157 searches. Data last updated 30 October 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

Thu 26/2

07:10-19:45

1 stop17h 35m

Sydney Kingsford Smith

Tue 17/3

21:40-21:50

1 stop18h 10m

$1,513

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 26/2

07:10-19:45

1 stop17h 35m

Sydney Kingsford Smith

Tue 10/3

21:40-21:50

1 stop18h 10m

$1,513

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 25/11

10:30-19:45

1 stop38h 15m

Sydney Kingsford Smith

Tue 2/12

21:40-06:00

2 stops27h 20m

$1,539

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sat 28/2

07:10-19:45

1 stop17h 35m

Sydney Kingsford Smith

Tue 17/3

21:40-21:50

1 stop18h 10m

$1,636

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 10/11

07:09-19:45

1 stop17h 36m

Sydney Kingsford Smith

Fri 12/12

21:40-05:25

1 stop26h 45m

$1,757

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 17/11

07:09-19:45

1 stop17h 36m

Sydney Kingsford Smith

Thu 4/12

21:40-05:25

1 stop26h 45m

$1,757

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 10/11

07:09-19:45

1 stop17h 36m

Sydney Kingsford Smith

Fri 12/12

21:40-20:50

1 stop18h 10m

$1,759

PortlandSydney

PDX - SYD

PDXSYD

Portland

Wed 26/11

06:00-09:05

2 stops32h 05m

Sydney Kingsford Smith

Mon 15/12

11:50-22:52

2 stops30h 02m

$1,839

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 8/12

19:43-09:15

1 stop18h 32m

Sydney Kingsford Smith

Mon 15/12

11:50-22:57

1 stop30h 07m

$1,839

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 17/11

06:00-09:05

2 stops32h 05m

Sydney Kingsford Smith

Thu 4/12

11:50-18:41

2 stops25h 51m

$1,866

Flights are sorted by cheapest return flights first.

Deals found on 27/10

Showing 1-10 of 22 results
1
2
3

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 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 Sydney

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

Use this chart to determine the optimal time to book a return flight from Portland to Sydney. Price data was last updated on 24 October 2025.

The best time to book flights from Portland to Sydney is 39 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, February is the cheapest month in which you can book a flight from Portland to Sydney (average of $822). Flying from Portland to Sydney in July is currently the most expensive (average of $1,449). 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 30 October 2025.

One of the essential ways to save on airfare from Portland to Sydney is to remain as flexible as possible. Flights that are at midday tend to be the most expensive. A flight in the morning could potentially save you up to 30% on airfare.

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 30 October 2025.
Read reviews from past customers who have flown with United Airlines from Portland to Sydney. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,999 reviews
Check prices

Boarding

7.7

Crew

8.1

Comfort

7.3

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
8,999 reviews
United Airlines
7.4
Good
8,999 reviews
Check prices

Boarding

7.7

Crew

8.1

Comfort

7.3

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

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?

    Airlines like Alaska Airlines fly from Portland to Sydney in about 17h 35m. The time it takes to get you to your destination can typically vary by up to . The distance from Portland to Sydney is about 12350 km.

  • What is the cheapest airline to fly from Portland to Sydney round-trip?

    Cheapflights users have booked flights from Portland to Sydney round-trip from $1,260. You may be able to fly from Portland to Sydney for 25% less than the average price by searching for this airline.

  • What are the cheapest airlines to fly from Portland to Sydney one-way?

    One-way options have recently been found by users for as low as $543 on ANA. Other airlines that offer cheap prices include Air Canada from $810 and Qantas Airways from $846 one-way.

  • 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 holiday 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, February is the cheapest month in which you can book a flight from Portland to Sydney (average of $822). Flying from Portland to Sydney in July is currently the most expensive (average of $1,449). 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

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Katoomba
Penrith
Manly
Terrigal
Randwick
Lithgow
Coogee
Leura
Bondi Beach
Cronulla

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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
Eugene to Sydney flights
Portland to Coolangatta flights

Top airline flying from Portland to Sydney

Discover the top airline 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 647,157 searches. Data last updated 30 October 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,260Average$1,946FlexibilityNo 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 Sydney?

Deals for Portland to Sydney flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Portland to Sydney?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Portland to Sydney.

Can Cheapflights find flights from Portland to Sydney with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Portland to Sydney flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Portland to Sydney become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Sydney from Portland today and book when prices fit your budget.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.