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Cheap flights from Porto to Sydney from $819

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 16/9. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SYD
24 Aug — 31 Aug1
1 adult

Cheap flight deals from Porto to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Porto (OPO) 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 19 August 2025.

Round-trip from

$1,858

One-way from

$819

Popular in

April

Cheapest in

February

Average price

$2,667
3/10-10/10
  • 3/10-10/10
  • 6 total stops
  • 74h 25m total
  • Porto to Sydney
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16/9
  • 16/9
  • 3 total stops
  • 58h 35m total
  • Porto to Sydney
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($78 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease ($71 potential savings vs. average return price).
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Average for round-trip flights in August 2025
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Find flight deals from Porto to Sydney

Cheapest flights from Porto to Sydney
Explore the most affordable flight options available from Porto to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 August 2025.

Fri 3/1006:20OPO - SYD
3 stops28h 40mMultiple Airlines
Fri 10/1006:00SYD - OPO
3 stops45h 45mMultiple Airlines
Deal found 19/8$1,865
Thu 18/906:40OPO - SYD
3 stops42h 15mMultiple Airlines
Sat 4/1021:30SYD - OPO
2 stops33h 40mMultiple Airlines
Deal found 19/8$1,958
Fri 5/907:10OPO - SYD
3 stops39h 40mMultiple Airlines
Sun 21/919:40SYD - OPO
2 stops35h 55mMultiple Airlines
Deal found 18/8$1,967
Wed 1/1017:05OPO - SYD
3 stops29h 45mMultiple Airlines
Wed 8/1010:15SYD - OPO
3 stops45h 50mMultiple Airlines
Deal found 17/8$1,974
Sun 7/921:25OPO - SYD
2 stops46h 55mBritish Airways
Sun 21/914:40SYD - OPO
2 stops38h 40mBritish Airways
Deal found 19/8$1,984
Sun 7/921:25OPO - SYD
2 stops46h 55mBritish Airways
Mon 22/914:40SYD - OPO
2 stops38h 10mBritish Airways
Deal found 17/8$1,989
Wed 3/909:00OPO - SYD
2 stops42h 35mMultiple Airlines
Sun 7/920:30SYD - OPO
2 stops36h 10mMultiple Airlines
Deal found 18/8$2,011

Cheapflights Fare Finder

 
Customise your flight search to find flights from Porto 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 19 August 2025.
Use the filters below to find and compare flights from Porto to Sydney that are best for you.

Fly from

Porto

Fly to

Sydney

Route

Depart

Return

Price

PortoSydney

OPO - SYD

OPOSYD

Porto

Fri 3/10

06:20-20:00

3 stops28h 40m

Sydney Kingsford Smith

Fri 10/10

06:00-17:45

3 stops45h 45m

$1,858

PortoSydney

OPO - SYD

OPOSYD

Porto

Thu 18/9

06:40-09:55

3 stops42h 15m

Sydney Kingsford Smith

Sat 4/10

21:30-22:10

2 stops33h 40m

$1,958

PortoSydney

OPO - SYD

OPOSYD

Porto

Fri 5/9

07:10-07:50

3 stops39h 40m

Sydney Kingsford Smith

Sun 21/9

19:40-22:35

2 stops35h 55m

$1,967

PortoSydney

OPO - SYD

OPOSYD

Porto

Wed 1/10

17:05-07:50

3 stops29h 45m

Sydney Kingsford Smith

Wed 8/10

10:15-22:05

3 stops45h 50m

$1,974

PortoSydney

OPO - SYD

OPOSYD

Porto

Sun 7/9

21:25-05:20

2 stops46h 55m

Sydney Kingsford Smith

Sun 21/9

14:40-20:20

2 stops38h 40m

$1,984

PortoSydney

OPO - SYD

OPOSYD

Porto

Mon 8/9

11:45-05:20

2 stops32h 35m

Sydney Kingsford Smith

Mon 22/9

14:40-19:50

2 stops38h 10m

$1,989

PortoSydney

OPO - SYD

OPOSYD

Porto

Tue 16/9

22:50-18:25

3 stops58h 35m

$819

PortoSydney

OPO - SYD

OPOSYD

Porto

Thu 18/9

16:00-20:00

3 stops43h 00m

$942

PortoSydney

OPO - SYD

OPOSYD

Porto

Sat 20/9

11:10-19:30

3 stops47h 20m

$961

PortoSydney

OPO - SYD

OPOSYD

Porto

Fri 12/9

07:20-06:10

3 stops37h 50m

$973

Flights are sorted by cheapest return flights first.

Deals found on 17/8

Showing 1-10 of 13 results
1
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Best time to book a flight from Porto to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Porto 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 Porto to Sydney

What is the cheapest month to book a flight from Porto to Sydney?

Currently, May is the cheapest month in which you can book a flight from Porto to Sydney (average of $129). Flying from Porto to Sydney in October is currently the most expensive (average of $171). 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.

Related info for your journey

Find useful and relevant information for your journey from Porto to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find deals for flights from Porto to Sydney that include hotel bookings?

    Yes. In addition to deals on Porto to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Porto to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Porto to Sydney.

  • Can I find deals for business class flights from Porto to Sydney?

    Yes. Cheapflights offers flight deals from Porto 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 Porto to Sydney?

    Currently, May is the cheapest month in which you can book a flight from Porto to Sydney (average of $129). Flying from Porto to Sydney in October is currently the most expensive (average of $171). 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
Katoomba
Penrith
Coogee
Terrigal
Manly
Cronulla
Lithgow
Randwick
Bondi Beach
Leura

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Alternative routes for Porto to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Lisbon to Sydney flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Porto to Sydney?

Deals for Porto 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 Porto to Sydney?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Porto to Sydney for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Porto to Sydney with no change fees?

Need flexible booking options for your flight to Sydney from Porto? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Porto to Sydney become cheaper?

Yes, Cheapflights offers price alerts on Porto to Sydney flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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