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 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — SYD
11 Jan — 18 Jan1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Portland to Sydney Kingsford Smith are usually found in September or June, booked 67 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday
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 12 December 2025.
Mon 29/1216:26PDX - SYD
1 stop19h 59mQantas Airways
Tue 13/119:15SYD - PDX
2 stops37h 20mQantas Airways
Deal found 10/12$1,520
Sat 27/1219:45PDX - SYD
1 stop18h 30mUnited Airlines
Wed 4/311:50SYD - PDX
2 stops26h 05mUnited Airlines
Deal found 11/12$1,909
Sat 27/1205:30PDX - SYD
2 stops32h 00mDelta
Wed 4/310:40SYD - PDX
2 stops29h 15mDelta
Deal found 12/12$1,916
Fri 26/1219:45PDX - SYD
1 stop39h 35mUnited Airlines
Mon 12/114:00SYD - PDX
1 stop19h 46mUnited Airlines
Deal found 10/12$1,919
Tue 23/1219:55PDX - SYD
1 stop41h 35mDelta
Mon 12/114:15SYD - PDX
1 stop25h 20mDelta
Deal found 10/12$1,921
Thu 25/1213:30PDX - SYD
1 stop22h 20mDelta
Mon 12/114:15SYD - PDX
2 stops49h 44mDelta
Deal found 10/12$1,937
Best flights from Portland to Sydney
Discover carefully curated flight deals from Portland to Sydney that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 December 2025.
Fri 6/216:51PDX - SYD
1 stop18h 19mQantas Airways
Tue 10/208:45SYD - PDX
2 stops23h 56mQantas Airways
Deal found 11/12$1,573
Wed 4/319:05PDX - SYD
1 stop19h 30mAir Canada
Thu 19/307:30SYD - PDX
2 stops29h 00mAir Canada
Deal found 11/12$1,597
Wed 29/417:30PDX - SYD
1 stop21h 00mMultiple Airlines
Fri 15/517:50SYD - PDX
1 stop21h 41mMultiple Airlines
Deal found 11/12$1,648
Wed 4/319:57PDX - SYD
1 stop18h 18mUnited Airlines
Wed 18/312:10SYD - PDX
1 stop18h 23mUnited Airlines
Deal found 11/12$1,672
Mon 8/613:00PDX - SYD
1 stop24h 35mDelta
Mon 22/609:25SYD - PDX
1 stop19h 48mDelta
Deal found 10/12$1,672
Mon 19/107:00PDX - SYD
1 stop17h 45mAlaska Airlines
Mon 26/121:40SYD - PDX
1 stop26h 51mAlaska Airlines
Deal found 9/12$1,744
Sun 1/305:05PDX - SYD
2 stops33h 00mUnited Airlines
Sun 22/312:10SYD - PDX
1 stop18h 23mUnited Airlines
Deal found 11/12$1,678
Sat 28/206:40PDX - SYD
1 stop31h 20mQantas Airways
Sat 21/317:45SYD - PDX
1 stop22h 23mQantas Airways
Deal found 11/12$1,738
Mon 1/607:20PDX - SYD
1 stop18h 30mAlaska Airlines
Sun 14/620:45SYD - PDX
1 stop19h 05mAlaska Airlines
Deal found 10/12$1,744
Thu 29/106:25PDX - SYD
1 stop29h 25mDelta
Sun 15/210:40SYD - PDX
1 stop24h 30mDelta
Deal found 9/12$1,747
Wed 4/310:56PDX - SYD
2 stops27h 19mUnited Airlines
Tue 17/312:10SYD - PDX
2 stops23h 41mUnited Airlines
Deal found 11/12$1,678
Sat 28/206:40PDX - SYD
1 stop31h 20mQantas Airways
Sun 22/317:45SYD - PDX
1 stop22h 23mQantas Airways
Deal found 11/12$1,738
Last-minute flights from Portland to Sydney
Discover last-minute flight deals from Portland to Sydney. Data last updated 12 December 2025 and is based on user searches.
Tue 16/1214:58PDX - SYD
2 stops26h 32mQantas Airways
Wed 7/121:55SYD - PDX
2 stops34h 46mQantas Airways
Deal found 11/12$3,677
Wed 17/1207:00PDX - SYD
1 stop17h 45mAlaska Airlines
Tue 30/1221:40SYD - PDX
1 stop26h 45mAlaska Airlines
Deal found 9/12$3,175
Wed 17/1210:30PDX - SYD
1 stop25h 55mMultiple Airlines
Tue 30/1208:20SYD - PDX
2 stops27h 51mMultiple Airlines
Deal found 9/12$3,228
Wed 17/1210:20PDX - SYD
1 stop38h 25mAlaska Airlines
Tue 30/1221:40SYD - PDX
1 stop26h 45mAlaska Airlines
Deal found 11/12$3,277
Sat 20/1213:30PDX - SYD
1 stop24h 00mDelta
Mon 12/114:15SYD - PDX
1 stop18h 20mDelta
Deal found 10/12$3,330
Sat 20/1213:30PDX - SYD
1 stop22h 20mDelta
Sun 11/110:40SYD - PDX
1 stop21h 55mDelta
Deal found 10/12$3,402
Sat 20/1212:17PDX - SYD
1 stop23h 33mDelta
Fri 9/110:40SYD - PDX
1 stop21h 55mDelta
Deal found 10/12$3,430
Sat 20/1213:30PDX - SYD
1 stop22h 20mDelta
Sat 10/110:40SYD - PDX
1 stop21h 55mDelta
Deal found 10/12$3,713
Sun 21/1219:30PDX - SYD
2 stops64h 20mDelta
Tue 6/110:40SYD - PDX
2 stops29h 19mDelta
Deal found 10/12$3,528
One-way flights from Portland to Sydney
Search for one-way flight options from Portland to Sydney. Find affordable one-way fares based on user searches. Data last updated 12 December 2025.
Wed 4/309:50PDX - SYD
1 stop28h 45mAir Canada
Deal found 11/12$775
Sun 29/319:00PDX - SYD
2 stops25h 40mMultiple Airlines
Deal found 11/12$799
Thu 5/219:05PDX - SYD
1 stop19h 30mAir Canada
Deal found 11/12$838
Thu 5/214:50PDX - SYD
2 stops23h 10mAmerican Airlines
Deal found 11/12$862
Wed 8/412:09PDX - SYD
1 stop26h 21mAmerican Airlines
Deal found 10/12$864
Thu 1/107:00PDX - SYD
2 stops28h 20mUnited Airlines
Deal found 10/12$876
Wed 8/407:40PDX - SYD
3 stops30h 50mMultiple Airlines
Deal found 10/12$921
Mon 5/116:26PDX - SYD
2 stops25h 04mQantas Airways
Deal found 11/12$952
Mon 5/107:00PDX - SYD
1 stop17h 45mAlaska Airlines
Deal found 11/12$1,047
Tue 12/507:40PDX - SYD
3 stops29h 45mMultiple Airlines
Deal found 10/12$1,078
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 12 December 2025.
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 12 December 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
Fri 6/2
16:51-06:10
1 stop18h 19m
Sydney Kingsford Smith
Tue 10/2
08:45-13:41
2 stops23h 56m
$1,573
PortlandSydney
PDX - SYD
PDXSYD
Portland
Wed 4/3
19:05-09:35
1 stop19h 30m
Sydney Kingsford Smith
Thu 19/3
07:30-18:30
2 stops29h 00m
$1,597
PortlandSydney
PDX - SYD
PDXSYD
Portland
Wed 29/4
17:30-07:30
1 stop21h 00m
Sydney Kingsford Smith
Fri 15/5
17:50-22:31
1 stop21h 41m
$1,648
PortlandSydney
PDX - SYD
PDXSYD
Portland
Wed 4/3
19:57-09:15
1 stop18h 18m
Sydney Kingsford Smith
Wed 18/3
12:10-12:33
1 stop18h 23m
$1,672
PortlandSydney
PDX - SYD
PDXSYD
Portland
Mon 8/6
13:00-06:35
1 stop24h 35m
Sydney Kingsford Smith
Mon 22/6
09:25-12:13
1 stop19h 48m
$1,672
PortlandSydney
PDX - SYD
PDXSYD
Portland
Sun 1/3
05:05-09:05
2 stops33h 00m
Sydney Kingsford Smith
Sun 22/3
12:10-12:33
1 stop18h 23m
$1,678
PortlandSydney
PDX - SYD
PDXSYD
Portland
Wed 4/3
10:56-09:15
2 stops27h 19m
Sydney Kingsford Smith
Tue 17/3
12:10-17:51
2 stops23h 41m
$1,678
PortlandSydney
PDX - SYD
PDXSYD
Portland
Sat 28/2
06:40-09:00
1 stop31h 20m
Sydney Kingsford Smith
Sat 21/3
17:45-22:08
1 stop22h 23m
$1,738
PortlandSydney
PDX - SYD
PDXSYD
Portland
Sat 28/2
06:40-09:00
1 stop31h 20m
Sydney Kingsford Smith
Sun 22/3
17:45-22:08
1 stop22h 23m
$1,738
PortlandSydney
PDX - SYD
PDXSYD
Portland
Mon 19/1
07:00-19:45
1 stop17h 45m
Sydney Kingsford Smith
Mon 26/1
21:40-05:31
1 stop26h 51m
$1,744
Flights are sorted by cheapest return flights first.
Deals found on 9/12
Showing 1-10 of 22 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
Prices
More
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 5 December 2025.
The best time to book flights from Portland to Sydney is 67 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 $757). Flying from Portland to Sydney in December is currently the most expensive (average of $1,613). 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 12 December 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.
How much does it cost for a return flight from Portland to Sydney?
What’s the top stopover airport for flights from Portland to Sydney?
Share of one-stop return flights from Portland to Sydney chosen by Cheapflights users in the past 12 months, using the same stopover each way.
San Francisco (SFO) – chosen by Cheapflights users on 67% of one-stop itineraries from Portland to Sydney on Cheapflights.
What’s the cheapest stopover airport for flights from Portland to Sydney?
Average return fare for one-stop flights from Portland to Sydney, chosen by Cheapflights users in the past 12 months, with the same stopover each way.
San Francisco (SFO) is the most affordable one-stop option, with an average return flight price of $1,262.
What’s the fastest stopover option from Portland to Sydney?
Shortest average travel time for one-stop one-way flights from Portland to Sydney, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.
Flights via Vancouver (YVR) have the shortest average one-way travel time for one-stop routes: 18h 40m.
Which airport typically offers the quickest stopover for flights from Portland to Sydney?
Average stopover duration for one-stop one-way flights from Portland to Sydney, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Vancouver (YVR) offer the fastest connection on this route, with an average stopover time of 1h 37m.
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 12 December 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.
Smooth flight from Austin to Newark. The crew was friendly.
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, Air Canada, and United Airlines fly from Portland to Sydney in about 18h 18m. The time it takes to get you to your destination can typically vary by up to 1h 12m. 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 $1,248. You may be able to fly from Portland to Sydney for 29% less than the average price by searching for this airline.
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 $757). Flying from Portland to Sydney in December is currently the most expensive (average of $1,613). 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.
Explore flights to Sydney departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 12 December 2025.
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 12 December 2025.
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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