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$564+ Cheap flights from Ontario (ONT) to Porto (OPO)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — OPO
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Ontario to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Porto (OPO). 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 September 17, 2025.

Round-trip from

$564
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$928
From Ontario to Porto
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High demand for flights, 2% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Ontario to Porto

Cheapest flights from Ontario to Porto
Explore the most affordable flight options available from Ontario to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/105:05 amONT - OPO
2 stops20h 25mUnited Airlines
Wed 11/2612:30 pmOPO - ONT
2 stops18h 21mUnited Airlines
Deal found 9/16$564
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/107:00 amONT - OPO
2 stops18h 30mUnited Airlines
Thu 11/2712:30 pmOPO - ONT
2 stops32h 07mUnited Airlines
Deal found 9/17$570
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/151:29 pmONT - OPO
2 stops36h 01mUnited Airlines
Tue 11/2512:30 pmOPO - ONT
2 stops18h 21mUnited Airlines
Deal found 9/16$576
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1010:25 pmONT - OPO
2 stops28h 05mDelta
Mon 11/246:30 amOPO - ONT
2 stops49h 22mDelta
Deal found 9/16$611
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1211:45 amONT - OPO
2 stops38h 40mDelta
Mon 11/246:30 amOPO - ONT
2 stops49h 22mDelta
Deal found 9/16$612
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1610:25 pmONT - OPO
2 stops52h 05mDelta
Mon 11/246:30 amOPO - ONT
2 stops49h 22mDelta
Deal found 9/16$619
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/135:05 amONT - OPO
2 stops20h 25mUnited Airlines
Thu 11/2712:30 pmOPO - ONT
2 stops32h 07mUnited Airlines
Deal found 9/17$620
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2910:42 amONT - OPO
2 stops20h 13mUnited Airlines
Thu 1/86:00 amOPO - ONT
2 stops24h 53mUnited Airlines
Deal found 9/16$632
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/301:15 pmONT - OPO
2 stops19h 10mDelta
Sun 11/211:15 amOPO - ONT
2 stops42h 05mDelta
Deal found 9/15$817
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/297:00 amONT - OPO
2 stops19h 30mUnited Airlines
Sun 11/25:00 amOPO - ONT
2 stops22h 44mUnited Airlines
Deal found 9/15$889

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Porto 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 2,558,603 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from Ontario to Porto that are best for you.

Fly from

Ontario

Fly to

Porto

Route

Depart

Return

Price

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 11/11

7:00 am-9:30 am

2 stops18h 30m

Porto

Tue 11/25

12:30 pm-10:51 pm

2 stops18h 21m

$564

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 11/12

5:05 am-9:30 am

2 stops20h 25m

Porto

Tue 11/25

12:30 pm-10:51 pm

2 stops18h 21m

$564

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 11/10

5:05 am-9:30 am

2 stops20h 25m

Porto

Wed 11/26

12:30 pm-10:51 pm

2 stops18h 21m

$564

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 11/12

7:00 am-9:30 am

2 stops18h 30m

Porto

Wed 11/26

12:30 pm-10:51 pm

2 stops18h 21m

$565

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 11/10

7:00 am-9:30 am

2 stops18h 30m

Porto

Tue 11/25

12:30 pm-10:51 pm

2 stops18h 21m

$565

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 11/16

5:05 am-9:30 am

2 stops20h 25m

Porto

Tue 11/25

12:30 pm-10:51 pm

2 stops18h 21m

$565

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 11/16

7:00 am-9:30 am

2 stops18h 30m

Porto

Wed 11/26

12:30 pm-10:51 pm

2 stops18h 21m

$565

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 11/16

7:00 am-9:30 am

2 stops18h 30m

Porto

Thu 11/27

12:30 pm-7:41 pm

2 stops39h 11m

$570

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 11/12

5:05 am-9:30 am

2 stops20h 25m

Porto

Thu 11/27

12:30 pm-7:41 pm

2 stops39h 11m

$570

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 11/10

7:00 am-9:30 am

2 stops18h 30m

Porto

Thu 11/27

12:30 pm-12:37 pm

2 stops32h 07m

$570

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 20 results
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Best time to book a flight from Ontario to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Ontario with our price prediction graph.
Estimated round-trip 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 Ontario to Porto

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Porto (average of $523). Flying from Ontario to Porto in June is currently the most expensive (average of $1,028). 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 ONT to OPO?

Find hourly flight availability from Ontario to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Porto as you normally would.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Porto. 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 Ontario to Porto?

    United Airlines can get you from Ontario to Porto in just under 18h 30m. Your travel time can differ by up to . The distance from Ontario to Porto is about 5549 mi.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Ontario to Porto (average of $523). Flying from Ontario to Porto in June is currently the most expensive (average of $1,028). 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

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Aveiro
Arcos de Valdevez
Coimbra

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