Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Portland to Sydney from $578

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Sydney departing on 6/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Portland to Sydney

Cheap return flights

United Airlines Logo
17:40 - 06:55PDX-SYD
20h 15m1 stop
United Airlines Logo
10:20 - 14:42SYD-PDX
21h 22m1 stop
$1,161United Airlines
Find Deal
Mon, 1 Sep - Mon, 15 Sep
Air Canada Logo
15:25 - 07:20PDX-SYD
22h 55m1 stop
Air Canada Logo
09:20 - 18:46SYD-PDX
26h 26m1 stop
$1,198Air Canada
Find Deal
Tue, 23 Sep - Tue, 30 Sep
Air Canada Logo
19:40 - 07:20PDX-SYD
18h 40m1 stop
Air Canada Logo
09:20 - 14:46SYD-PDX
22h 26m1 stop
$1,202Air Canada
Find Deal
Sat, 30 Aug - Fri, 26 Sep
Qantas Airways Logo
14:56 - 07:05PDX-SYD
23h 09m1 stop
Qantas Airways Logo
09:10 - 13:24SYD-PDX
21h 14m1 stop
$1,216Qantas Airways
Find Deal
Tue, 2 Sep - Tue, 23 Sep
Qantas Airways Logo
14:56 - 07:05PDX-SYD
23h 09m1 stop
Qantas Airways Logo
17:45 - 19:10SYD-PDX
18h 25m1 stop
$1,219Qantas Airways
Find Deal
Tue, 2 Sep - Tue, 23 Sep
Air Canada Logo
15:25 - 07:20PDX-SYD
22h 55m1 stop
Air Canada Logo
07:30 - 14:46SYD-PDX
24h 16m2 stops
$1,220Air Canada
Find Deal
Tue, 23 Sep - Tue, 30 Sep
American Airlines Logo
15:22 - 07:05PDX-SYD
22h 43m2 stops
American Airlines Logo
09:10 - 12:45SYD-PDX
20h 35m1 stop
$1,222American Airlines
Find Deal
Mon, 1 Sep - Mon, 15 Sep
American Airlines Logo
15:22 - 07:05PDX-SYD
22h 43m2 stops
American Airlines Logo
06:25 - 12:45SYD-PDX
23h 20m2 stops
$1,245American Airlines
Find Deal
Mon, 1 Sep - Mon, 15 Sep
Delta Logo
16:55 - 06:35PDX-SYD
20h 40m1 stop
Delta Logo
09:25 - 18:51SYD-PDX
26h 26m2 stops
$1,254Delta
Find Deal
Mon, 1 Sep - Tue, 23 Sep
United Airlines Logo
13:01 - 06:55PDX-SYD
24h 54m2 stops
United Airlines Logo
09:30 - 21:01SYD-PDX
28h 31m2 stops
$1,341United Airlines
Find Deal
Thu, 4 Sep - Sun, 7 Sep

United Airlines flights from Portland to Sydney

Our best United Airlines deals on Portland to Sydney flight tickets
United Airlines
1 Sept
PDX17:40Portland
20h 15m
1 stop
SYD06:55Sydney Kingsford Smith
15 Sept
SYD10:20Sydney Kingsford Smith
21h 22m
1 stop
PDX14:42Portland
$1,161
Find similar
United Airlines
4 Sept
PDX13:01Portland
24h 54m
2 stops
SYD06:55Sydney Kingsford Smith
7 Sept
SYD09:30Sydney Kingsford Smith
28h 31m
2 stops
PDX21:01Portland
$1,341
Find similar
United Airlines
31 July
PDX19:35Portland
18h 20m
1 stop
SYD06:55Sydney Kingsford Smith
29 Aug
SYD10:20Sydney Kingsford Smith
25h 12m
1 stop
PDX18:32Portland
$1,465
Find similar

American Airlines flights from Portland to Sydney

Our best American Airlines deals on Portland to Sydney flight tickets
American Airlines
1 Sept
PDX15:22Portland
22h 43m
2 stops
SYD07:05Sydney Kingsford Smith
15 Sept
SYD09:10Sydney Kingsford Smith
20h 35m
1 stop
PDX12:45Portland
$1,222
Find similar
American Airlines
1 Sept
PDX15:22Portland
22h 43m
2 stops
SYD07:05Sydney Kingsford Smith
15 Sept
SYD06:25Sydney Kingsford Smith
23h 20m
2 stops
PDX12:45Portland
$1,245
Find similar
American Airlines
9 Aug
PDX14:56Portland
23h 09m
1 stop
SYD07:05Sydney Kingsford Smith
23 Aug
SYD09:10Sydney Kingsford Smith
22h 11m
1 stop
PDX14:21Portland
$1,447
Find similar

See travel insights to Sydney from

How to get the cheapest flight ticket from Portland to Sydney

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Portland and Sydney?

What is the cheapest month to fly to Sydney?

The month of September is, on average, the cheapest month to fly to Sydney from Portland, with most prices found around $1,567. If you aren’t able to travel to Sydney during the month of September, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $1,579.

What is the cheapest day to depart on your flight to Sydney?

Our data shows that Wednesday is the least expensive day to fly to Sydney. Tickets to fly out on this day can be as low as $1,230. The most expensive day to fly to Sydney is Sunday, with ticket prices averaging around $1,997.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the morning. momondo users have found flights departing from Portland to Sydney in the morning for as low as $1,381. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $1,790 on average. Flights to Sydney from Portland in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

How far in advance should I book a flight to Sydney?

You are more likely to see cheaper flights to Sydney from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,764 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Portland for as low as $1,400 on momondo.

Can stopping save me money on Portland to Sydney flights?

You could potentially save up to 32% on your flight if you consider stops on a Portland to Sydney flight.

How have Portland to Sydney flight prices changed over time?

As of July 2025, prices for Portland to Sydney flights are approximately 34% cheaper when compared to flights at the same time last year.

When to book flights from Portland to Sydney

Are you open to changing your travel dates? Check out the ideal times to fly from Portland to Sydney according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Portland to Sydney (PDX to SYD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to Sydney

Best price found

$578

Fastest flight time

18h 20m

Direct flights

None

Airports in Sydney

1 airport
The best one-way flight to Sydney from Portland in the past 72 hours is $578. The best return flight deal from Portland to Sydney found on momondo in the last 72 hours is $1,161.
The fastest flight from Portland to Sydney takes 18h 20m
There are no direct flights from Portland to Sydney. Popular non-direct route for this connection is Portland Airport - Sydney Kingsford Smith Airport.
There is 1 airport near Sydney: Sydney Kingsford Smith (SYD)
Search flight deals

  • How far is Portland to Sydney Kingsford Smith by plane?

    There are 12333.8 km between Portland and Sydney Kingsford Smith. By plane, this route typically takes 18h 20m.

  • When did momondo last update prices for flights from Portland Airport to Sydney Kingsford Smith Airport?

    Prices for flights from Portland Airport to Sydney Kingsford Smith Airport are updated daily.

  • How many operators does momondo search for flights from Portland Airport to Sydney Kingsford Smith Airport?

  • How old do you have to be to fly from Portland Airport to Sydney Kingsford Smith Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and stopovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Portland Airport to Sydney Kingsford Smith Airport.

  • What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

    The travel and health documents you'll need for your trip to Sydney Kingsford Smith Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Sydney Kingsford Smith Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Portland to Sydney?

Best airlines flying from Portland to Sydney

Compare and see reviews for airlines that fly from Portland to Sydney with momondo
Airline
Rating
Free cancellation
Price
United AirlinesPriceFrom $1,292Free cancellationRating
7.4
8,856 reviews
Search United Airlines flights

Travelling to a place near Sydney?

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

Why use momondo?

Why should I use momondo to find a flight deal from Portland to Sydney?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Portland to Sydney . Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Portland to Sydney with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sydney from Portland with this policy.

How can momondo help me find flights from Portland to Sydney?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Sydney from Portland.

I’m not ready to book a flight from Portland to Sydney right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Portland to Sydney flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Sydney trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 19/7
Sat 26/7
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Australia