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$266+ Cheap flights from Ontario (ONT) to Porto (OPO)

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.
ONT — OPO
Mar 23 — Mar 301
Mon 3/23
Mon 3/30
1 adult, Economy
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Find cheap flights from Ontario to Porto with Cheapflights

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Cheap 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 February 21, 2026.

This United Airlines deal was found by Cheapflights users on 2/17. 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.
Tue 4/217:00 am
ONT
-
OPO
2 stops18h 45m
United Airlines
Tue 4/286:00 am
OPO
-
ONT
2 stops24h 26m
United Airlines
Deal found 2/17$492
This United Airlines deal was found by Cheapflights users on 2/18. 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 4/156:05 am
ONT
-
OPO
2 stops19h 40m
United Airlines
Wed 4/226:00 am
OPO
-
ONT
2 stops24h 26m
United Airlines
Deal found 2/18$591
This United Airlines deal was found by Cheapflights users on 2/17. 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 9/216:53 pm
ONT
-
OPO
2 stops28h 07m
United Airlines
Thu 9/2411:50 am
OPO
-
ONT
2 stops56h 30m
United Airlines
Deal found 2/17$604
This United Airlines deal was found by Cheapflights users on 2/18. 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 10/16:30 pm
ONT
-
OPO
2 stops28h 40m
United Airlines
Thu 10/1511:50 am
OPO
-
ONT
2 stops37h 28m
United Airlines
Deal found 2/18$641
This Billigflug deal was found by Cheapflights users on 2/20. 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 Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/176:00 am
ONT
-
OPO
2 stops32h 15m
Multiple Airlines
Wed 4/225:00 am
OPO
-
ONT
2 stops26h 44m
Multiple Airlines
Deal found 2/20$683
This United Airlines deal was found by Cheapflights users on 2/18. 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.
Tue 4/147:00 am
ONT
-
OPO
2 stops18h 45m
United Airlines
Wed 4/2212:35 pm
OPO
-
ONT
2 stops18h 10m
United Airlines
Deal found 2/18$688
This Expedia deal was found by Cheapflights users on 2/19. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/57:00 am
ONT
-
OPO
2 stops40h 40m
Iberia
Sun 4/124:40 pm
OPO
-
ONT
2 stops39h 06m
Iberia
Deal found 2/19$704
This United Airlines deal was found by Cheapflights users on 2/17. 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.
Fri 8/217:00 am
ONT
-
OPO
2 stops15h 55m
United Airlines
Sat 9/129:00 am
OPO
-
ONT
2 stops19h 20m
United Airlines
Deal found 2/17$716
This United Airlines deal was found by Cheapflights users on 2/20. 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 3/55:15 am
ONT
-
OPO
2 stops20h 15m
United Airlines
Wed 3/116:00 am
OPO
-
ONT
2 stops23h 57m
United Airlines
Deal found 2/20$739
This United Airlines deal was found by Cheapflights users on 2/20. 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 4/151:34 pm
ONT
-
OPO
2 stops18h 06m
United Airlines
Tue 4/286:00 am
OPO
-
ONT
2 stops22h 36m
United Airlines
Deal found 2/20$743
This United Airlines deal was found by Cheapflights users on 2/18. 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 2/196:37 pm
ONT
-
OPO
2 stops36h 08m
United Airlines
Wed 2/256:00 am
OPO
-
ONT
2 stops22h 50m
United Airlines
Deal found 2/18$761

Find 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 February 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$492
(United Airlines)

One-way from

$266
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$625
Provider with most accurate pricing for Ontario-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Porto flights.
Search Deals
From Ontario to Porto
Search Deals
One-way flight from Ontario to Porto
Search Deals
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 21, 2026.
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 4/21

7:00 am-9:45 am

2 stops18h 45m

Porto

Tue 4/28

6:00 am-10:26 pm

2 stops24h 26m

$492

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 4/15

6:05 am-9:45 am

2 stops19h 40m

Porto

Wed 4/22

6:00 am-10:26 pm

2 stops24h 26m

$591

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Fri 4/17

6:00 am-10:15 pm

2 stops32h 15m

Porto

Wed 4/22

5:00 am-11:44 pm

2 stops26h 44m

$683

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 4/14

7:00 am-9:45 am

2 stops18h 45m

Porto

Wed 4/22

12:35 pm-10:45 pm

2 stops18h 10m

$688

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 4/6

5:10 am-3:40 pm

2 stops26h 30m

Porto

Mon 4/13

12:35 pm-9:50 pm

2 stops41h 15m

$767

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 6/7

5:00 am-6:50 am

2 stops17h 50m

Porto

Thu 7/2

9:00 am-10:46 pm

2 stops21h 46m

$781

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 6/7

5:00 am-6:50 am

2 stops17h 50m

Porto

Wed 7/8

9:00 am-8:42 pm

2 stops19h 42m

$781

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 6/7

5:00 am-6:50 am

2 stops17h 50m

Porto

Sat 7/4

9:00 am-8:42 pm

2 stops19h 42m

$851

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Fri 4/17

6:05 am-9:45 am

2 stops19h 40m

Porto

Thu 4/23

6:00 am-8:36 pm

2 stops22h 36m

$901

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Fri 4/3

6:00 am-11:45 am

2 stops21h 45m

Porto

Fri 4/10

8:20 am-11:46 pm

2 stops23h 26m

$940

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 21 results
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Compare providers for flights from Ontario to Porto

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Porto in February.
ProviderPrice AccuracyTrust Score*
AranGrantPrice Accuracy2 starsTrust Score*2 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Porto flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, May is the cheapest month in which you can book a flight from Ontario to Porto (average of $404). Flying from Ontario to Porto in June is currently the most expensive (average of $821). 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 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 45m. 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, May is the cheapest month in which you can book a flight from Ontario to Porto (average of $404). Flying from Ontario to Porto in June is currently the most expensive (average of $821). 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
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

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