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Cheap flights from Portland to Sydney from $679

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 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — SYD
27 Feb — 6 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap 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 28 January 2026.

Mon 23/217:39
PDX
-
SYD
2 stops44h 31m
Qantas Airways
Mon 2/311:20
SYD
-
PDX
1 stop24h 53m
Qantas Airways
Deal found 26/1$1,403
Thu 26/206:25
PDX
-
SYD
1 stop30h 00m
Qantas Airways
Tue 10/319:15
SYD
-
PDX
2 stops44h 47m
Qantas Airways
Deal found 27/1$1,426
Sun 22/221:30
PDX
-
SYD
1 stop38h 55m
Multiple Airlines
Sun 8/314:00
SYD
-
PDX
2 stops39h 52m
Multiple Airlines
Deal found 27/1$1,431
Mon 23/214:30
PDX
-
SYD
2 stops27h 05m
Multiple Airlines
Mon 2/306:00
SYD
-
PDX
2 stops33h 53m
Multiple Airlines
Deal found 27/1$1,432
Tue 5/514:50
PDX
-
SYD
1 stop22h 35m
Qantas Airways
Tue 12/506:25
SYD
-
PDX
2 stops24h 01m
Qantas Airways
Deal found 26/1$1,445
Sun 8/214:57
PDX
-
SYD
2 stops31h 43m
Qantas Airways
Wed 4/311:20
SYD
-
PDX
1 stop24h 53m
Qantas Airways
Deal found 27/1$1,455
Tue 10/216:51
PDX
-
SYD
1 stop18h 19m
Qantas Airways
Fri 13/207:45
SYD
-
PDX
2 stops28h 28m
Qantas Airways
Deal found 27/1$1,464
Fri 30/106:01
PDX
-
SYD
1 stop30h 24m
Qantas Airways
Sat 14/217:50
SYD
-
PDX
2 stops42h 23m
Qantas Airways
Deal found 26/1$1,474
Thu 23/409:53
PDX
-
SYD
1 stop28h 37m
Multiple Airlines
Sun 10/513:15
SYD
-
PDX
2 stops39h 42m
Multiple Airlines
Deal found 27/1$1,478

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 28 January 2026.

Round-trip from

$1,403

One-way from

$679

Popular in

December

Cheapest in

June

Average price

$1,671
Qantas Airways
  • Qantas Airways
  • 23/2-2/3
  • 3 total stops
  • 69h 24m total
  • Portland to Sydney
Search Deals
2/3
  • 2/3
  • 2 total stops
  • 46h 19m total
  • Portland to Sydney
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($387 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($115 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 28 January 2026.
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

Mon 23/2

17:39-09:10

2 stops44h 31m

Sydney Kingsford Smith

Mon 2/3

11:20-17:13

1 stop24h 53m

$1,424

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 22/2

21:30-07:25

1 stop38h 55m

Sydney Kingsford Smith

Sun 8/3

14:00-10:52

2 stops39h 52m

$1,431

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 5/5

14:50-06:25

1 stop22h 35m

Sydney Kingsford Smith

Tue 12/5

06:25-13:26

2 stops24h 01m

$1,445

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 19/4

17:45-11:45

2 stops25h 00m

Sydney Kingsford Smith

Sun 26/4

13:15-20:35

2 stops24h 20m

$1,580

PortlandSydney

PDX - SYD

PDXSYD

Portland

Wed 25/2

17:50-12:35

2 stops23h 45m

Sydney Kingsford Smith

Wed 4/3

14:00-16:41

2 stops21h 41m

$1,622

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 5/5

19:45-07:20

1 stop18h 35m

Sydney Kingsford Smith

Tue 12/5

09:20-09:30

1 stop17h 10m

$1,632

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 17/3

19:05-08:35

1 stop19h 30m

Sydney Kingsford Smith

Tue 24/3

10:20-09:15

1 stop16h 55m

$1,671

PortlandSydney

PDX - SYD

PDXSYD

Portland

Fri 6/2

14:30-06:10

1 stop20h 40m

Sydney Kingsford Smith

Mon 23/2

08:45-17:13

2 stops27h 28m

$1,677

PortlandSydney

PDX - SYD

PDXSYD

Portland

Tue 17/3

10:30-19:45

1 stop39h 15m

Sydney Kingsford Smith

Tue 24/3

21:40-20:47

1 stop17h 07m

$1,701

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 6/7

07:41-18:50

1 stop18h 09m

Sydney Kingsford Smith

Sun 26/7

20:45-16:17

1 stop36h 32m

$1,703

Flights are sorted by cheapest return flights first.

Deals found on 26/1

Showing 1-10 of 21 results
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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 23 January 2026.

The best time to book flights from Portland to Sydney is 34 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 $725). Flying from Portland to Sydney in December is currently the most expensive (average of $1,649). 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.

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 28 January 2026.
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
9,209 reviews
Check prices

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,209 reviews
United Airlines
7.4
Good
9,209 reviews
Check prices

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 Qantas Airways fly from Portland to Sydney in about 44h 31m. 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 $1,321. You may be able to fly from Portland to Sydney for 21% less than the average price by searching for this airline.

  • 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 $725). Flying from Portland to Sydney in December is currently the most expensive (average of $1,649). 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
Penrith
Manly
Katoomba
Terrigal
Lithgow
Leura
Coogee
Cronulla
Randwick
Bondi Beach

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
Portland to Coolangatta flights
Eugene to Sydney 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 28 January 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,321Average$2,564FlexibilityNo 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.

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