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Cheap flights from Portland to Sydney from $740

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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — SYD
29 May — 5 Jun1
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 29 April 2026.

Thu 24/917:35
PDX
-
SYD
2 stops25h 15m
Multiple Airlines
Mon 5/1014:15
SYD
-
PDX
2 stops24h 16m
Multiple Airlines
Deal found 27/4$1,523
Fri 28/817:50
PDX
-
SYD
2 stops25h 00m
Multiple Airlines
Fri 4/913:15
SYD
-
PDX
2 stops24h 35m
Multiple Airlines
Deal found 29/4$1,524
Sun 3/519:45
PDX
-
SYD
1 stop18h 35m
Air Canada
Tue 19/509:20
SYD
-
PDX
1 stop26h 45m
Air Canada
Deal found 25/4$1,533
Fri 4/913:50
PDX
-
SYD
2 stops29h 00m
Multiple Airlines
Sun 13/913:15
SYD
-
PDX
2 stops24h 21m
Multiple Airlines
Deal found 29/4$1,542
Sun 1/1116:59
PDX
-
SYD
2 stops24h 36m
Multiple Airlines
Wed 11/1114:00
SYD
-
PDX
2 stops25h 48m
Multiple Airlines
Deal found 26/4$1,555
Mon 27/417:49
PDX
-
SYD
2 stops25h 01m
Multiple Airlines
Wed 6/513:15
SYD
-
PDX
2 stops24h 20m
Multiple Airlines
Deal found 26/4$1,562
Thu 20/821:35
PDX
-
SYD
2 stops45h 15m
Multiple Airlines
Mon 31/813:15
SYD
-
PDX
2 stops24h 35m
Multiple Airlines
Deal found 29/4$1,574
Sun 7/610:35
PDX
-
SYD
1 stop39h 15m
Alaska Airlines
Sun 14/620:45
SYD
-
PDX
1 stop26h 26m
Alaska Airlines
Deal found 24/4$1,590

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 29 April 2026.

Round-trip from

$1,523

One-way from

$740

Popular in

December

Cheapest in

September

Average price

$1,605
24/9-5/10
  • 24/9-5/10
  • 4 total stops
  • 49h 31m total
  • Portland to Sydney
Search Deals
8/9
  • 8/9
  • 2 total stops
  • 25h 15m total
  • Portland to Sydney
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($299 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($100 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 29 April 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 return flight
Fastest return journey

PortlandSydney

PDX - SYD

PDXSYD

Portland

Wed 20/5

08:00-18:50

1 stop17h 50m

Sydney Kingsford Smith

Sun 24/5

20:45-20:48

1 stop17h 03m

$1,612

PortlandSydney

PDX - SYD

PDXSYD

Portland

Wed 3/6

18:03-06:55

1 stop19h 52m

Sydney Kingsford Smith

Wed 10/6

10:20-12:08

1 stop18h 48m

$1,726

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 10/8

13:14-06:55

1 stop24h 41m

Sydney Kingsford Smith

Mon 24/8

10:20-10:12

1 stop16h 52m

$1,726

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 24/5

11:05-07:00

2 stops26h 55m

Sydney Kingsford Smith

Sun 31/5

09:30-15:13

2 stops22h 43m

$1,733

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sat 16/5

13:45-06:50

1 stop24h 05m

Sydney Kingsford Smith

Sun 31/5

09:15-16:23

1 stop24h 08m

$1,742

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sat 16/5

15:59-07:00

2 stops46h 01m

Sydney Kingsford Smith

Sun 31/5

10:20-12:14

1 stop18h 54m

$1,746

PortlandSydney

PDX - SYD

PDXSYD

Portland

Wed 14/10

10:40-18:50

1 stop38h 10m

Sydney Kingsford Smith

Tue 20/10

20:45-06:00

1 stop27h 15m

$1,793

PortlandSydney

PDX - SYD

PDXSYD

Portland

Sun 2/8

18:46-06:55

1 stop19h 09m

Sydney Kingsford Smith

Sat 15/8

09:30-15:05

2 stops22h 35m

$1,803

PortlandSydney

PDX - SYD

PDXSYD

Portland

Thu 30/7

08:35-07:00

3 stops29h 25m

Sydney Kingsford Smith

Mon 10/8

09:30-15:13

2 stops22h 43m

$1,803

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 12/10

15:50-07:50

2 stops22h 00m

Sydney Kingsford Smith

Sun 25/10

10:15-13:18

2 stops21h 03m

$1,831

Flights are sorted by cheapest return flights first.

Deals found on 25/4

Showing 1-10 of 19 resultsSorted by cheapest first
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 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?

The best time to book flights from Portland to Sydney is 10 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, September is the cheapest month in which you can book a flight from Portland to Sydney (average of $1,404). Flying from Portland to Sydney in December is currently the most expensive (average of $2,481). 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 for a return flight 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 29 April 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
9,680 reviews
Check prices

Boarding

7.7

Comfort

7.3

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,680 reviews
United Airlines
7.4
Good
9,680 reviews
Check prices

Boarding

7.7

Comfort

7.3

Overall

7.4

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

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 and United Airlines fly from Portland to Sydney in about 17h 50m. The time it takes to get you to your destination can typically vary by up to 2h 02m. The distance from Portland to Sydney is about 12350 km. Both multi-stop and direct flights can be found to your destination and back.

  • 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 $1,336. 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, September is the cheapest month in which you can book a flight from Portland to Sydney (average of $1,404). Flying from Portland to Sydney in December is currently the most expensive (average of $2,481). 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
Katoomba
Terrigal
Lithgow
Cronulla
Manly
Bondi Beach
Leura
Randwick
Coogee

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
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 29 April 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,336Average$2,482FlexibilityNo 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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