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$531+ 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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — SYD
May 29 — Jun 51
Fri 5/29
Fri 6/5
1 adult, Economy
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Cheap 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 April 29, 2026.

This FlightHub deal was found by Cheapflights users on 4/27. 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.
Thu 9/245:35 pm
PDX
-
SYD
2 stops25h 15m
Multiple Airlines
Mon 10/52:15 pm
SYD
-
PDX
2 stops24h 16m
Multiple Airlines
Deal found 4/27$1,093
This lol.travel deal was found by Cheapflights users on 4/25. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/37:45 pm
PDX
-
SYD
1 stop18h 35m
Air Canada
Tue 5/199:20 am
SYD
-
PDX
1 stop26h 45m
Air Canada
Deal found 4/25$1,100
This BusinessClass deal was found by Cheapflights users on 4/29. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/41:50 pm
PDX
-
SYD
2 stops29h 00m
Multiple Airlines
Sun 9/131:15 pm
SYD
-
PDX
2 stops24h 21m
Multiple Airlines
Deal found 4/29$1,107
This KAYAK deal was found by Cheapflights users on 4/26. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/14:59 pm
PDX
-
SYD
2 stops24h 36m
Multiple Airlines
Wed 11/112:00 pm
SYD
-
PDX
2 stops25h 48m
Multiple Airlines
Deal found 4/26$1,116
This oojo deal was found by Cheapflights users on 4/26. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/275:49 pm
PDX
-
SYD
2 stops25h 01m
Multiple Airlines
Wed 5/61:15 pm
SYD
-
PDX
2 stops24h 20m
Multiple Airlines
Deal found 4/26$1,121
This oojo deal was found by Cheapflights users on 4/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/209:35 pm
PDX
-
SYD
2 stops45h 15m
Multiple Airlines
Mon 8/311:15 pm
SYD
-
PDX
2 stops24h 35m
Multiple Airlines
Deal found 4/29$1,130
This Kiwi.com deal was found by Cheapflights users on 4/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/710:35 am
PDX
-
SYD
1 stop39h 15m
Alaska Airlines
Sun 6/148:45 pm
SYD
-
PDX
1 stop26h 26m
Alaska Airlines
Deal found 4/24$1,141
This SmartFares deal was found by Cheapflights users on 4/29. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/210:35 am
PDX
-
SYD
1 stop39h 15m
Alaska Airlines
Sun 6/148:45 pm
SYD
-
PDX
1 stop17h 05m
Alaska Airlines
Deal found 4/29$1,143

Find 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 April 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,093
(FlightHub)

One-way from

$614
(Travelocity)

Popular in

December

Cheapest in

September

Average price

$1,152
Provider with most accurate pricing for Portland-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Sydney Kingsford Smith flights.
Search Deals
From Portland to Sydney Kingsford Smith
Search Deals
One-way flight from Portland to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($155 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($51 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

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 April 29, 2026.
Use the filters below to find and compare flights from Portland to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

PortlandSydney

PDX - SYD

PDXSYD

Portland

Wed 6/3

6:03 pm-6:55 am

1 stop19h 52m

Sydney Kingsford Smith

Wed 6/10

10:20 am-12:08 pm

1 stop18h 48m

$1,239

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 8/10

1:14 pm-6:55 am

1 stop24h 41m

Sydney Kingsford Smith

Mon 8/24

10:20 am-10:52 pm

2 stops29h 32m

$1,244

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sat 5/16

3:59 pm-7:00 am

2 stops46h 01m

Sydney Kingsford Smith

Sun 5/31

10:20 am-12:14 pm

1 stop18h 54m

$1,253

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 8/13

3:43 pm-6:55 am

1 stop22h 12m

Sydney Kingsford Smith

Mon 8/24

10:20 am-2:47 pm

1 stop21h 27m

$1,289

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 7/30

5:00 am-7:00 am

2 stops33h 00m

Sydney Kingsford Smith

Mon 8/10

10:20 am-10:20 am

1 stop17h 00m

$1,294

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 10/16

7:40 pm-7:50 am

2 stops66h 10m

Sydney Kingsford Smith

Mon 10/26

9:40 am-7:28 pm

1 stop27h 48m

$1,329

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 6/12

11:05 am-7:00 am

2 stops26h 55m

Sydney Kingsford Smith

Fri 6/19

9:30 am-10:55 pm

2 stops30h 25m

$1,344

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 8/3

7:46 am-6:50 pm

1 stop18h 04m

Sydney Kingsford Smith

Sat 8/8

8:45 pm-9:29 am

2 stops29h 44m

$1,357

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 9/3

9:35 pm-6:50 pm

2 stops28h 15m

Sydney Kingsford Smith

Sun 9/20

8:45 pm-6:14 am

1 stop26h 29m

$1,362

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 7/6

8:50 am-7:00 am

2 stops29h 10m

Sydney Kingsford Smith

Sun 7/26

9:30 am-11:03 pm

2 stops30h 33m

$1,414

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/25

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Portland to Sydney

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Sydney in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
BudgetAirPrice Accuracy2 starsTrust Score*3 stars
Trip.comPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Portland-Sydney flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-Sydney flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland-Sydney flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland-Sydney flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland-Sydney flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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?

Booking 10 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, September is the cheapest month in which you can book a flight from Portland to Sydney (average of $1,008). Flying from Portland to Sydney in December is currently the most expensive (average of $1,781). 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.

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 April 29, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Qantas Airways, andUnited 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
7.9
Good
12,319 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Alaska Airlines
7.9
Good
12,319 reviews
Alaska Airlines
7.9
Good
12,319 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Qantas Airways
7.5
Good
1,028 reviews
Alaska Airlines
7.9
Good
12,319 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
United Airlines
7.4
Good
9,677 reviews
Alaska Airlines
7.9
Good
12,319 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
American Airlines
7.1
Good
11,681 reviews
Alaska Airlines
7.9
Good
12,319 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Air Canada
7.1
Good
10,982 reviews
Alaska Airlines
7.9
Good
12,319 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well

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 $1,141, Alaska Airlines can have you in Sydney from Portland in 39h 15m. There are 7674 mi between Portland and Sydney.

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

    Delta, at $229, was found to be the cheapest airline from Portland to Sydney.Alternate airlines to your destination round-trip include Hawaiian Airlines and United Airlines. Delta is 81% cheaper than the average price of flights available within the next 90 days to this destination.

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

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $431. Users have also found prices from $457 and $569 on Air Canada and Qantas Airways, respectively.

  • 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 $60 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, September is the cheapest month in which you can book a flight from Portland to Sydney (average of $1,008). Flying from Portland to Sydney in December is currently the most expensive (average of $1,781). 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
Coogee
Manly

Browse thousands of different options on Cheapflights for your next trip

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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
Redmond to Sydney flights
Medford to Sydney flights

Top 8 airlines flying from Portland to Sydney

Discover the top 8 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 April 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$229Average$1,259FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$550Average$1,157FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$877Average$1,239FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$886Average$1,161FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$898Average$1,152FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$954Average$984FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$999Average$1,160FlexibilityNo cancel feeOn-time75%
Alaska AirlinesCheapest$1,140Average$1,236FlexibilityNo cancel feeOn-timeN/A

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