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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 8/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — OPO
Mar 6 — Mar 131
Fri 3/6
Fri 3/13
1 adult, Economy
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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 4, 2026.

This United Airlines deal was found by Cheapflights users on 2/2. 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 3/38:00 am
ONT
-
OPO
2 stops17h 30m
United Airlines
Tue 3/106:00 am
OPO
-
ONT
2 stops21h 50m
United Airlines
Deal found 2/2$493
This Delta deal was found by Cheapflights users on 2/2. 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 3/26:00 am
ONT
-
OPO
2 stops20h 30m
Delta
Fri 3/135:00 am
OPO
-
ONT
2 stops19h 12m
Delta
Deal found 2/2$495
This United Airlines deal was found by Cheapflights users on 2/3. 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 3/46:09 am
ONT
-
OPO
2 stops19h 21m
United Airlines
Wed 3/116:00 am
OPO
-
ONT
2 stops23h 18m
United Airlines
Deal found 2/3$591
This Trip.com deal was found by Cheapflights users on 2/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/26:00 am
ONT
-
OPO
2 stops20h 30m
Multiple Airlines
Mon 3/164:10 pm
OPO
-
ONT
2 stops31h 18m
Multiple Airlines
Deal found 2/2$598
This United Airlines deal was found by Cheapflights users on 2/2. 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 4/286:05 am
ONT
-
OPO
2 stops19h 40m
United Airlines
Thu 5/146:00 am
OPO
-
ONT
2 stops24h 59m
United Airlines
Deal found 2/2$656
This United Airlines deal was found by Cheapflights users on 2/1. 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 8/195:00 am
ONT
-
OPO
2 stops17h 55m
United Airlines
Tue 8/259:00 am
OPO
-
ONT
2 stops19h 20m
United Airlines
Deal found 2/1$682
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Sun 2/226:00 am
ONT
-
OPO
2 stops19h 30m
United Airlines
Wed 3/412:30 pm
OPO
-
ONT
2 stops18h 27m
United Airlines
Deal found 2/3$689
This United Airlines deal was found by Cheapflights users on 2/4. 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
Sat 3/146:00 am
OPO
-
ONT
2 stops23h 57m
United Airlines
Deal found 2/4$690
This United Airlines deal was found by Cheapflights users on 2/3. 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 3/26:00 am
ONT
-
OPO
2 stops19h 30m
United Airlines
Mon 3/166:00 am
OPO
-
ONT
2 stops23h 18m
United Airlines
Deal found 2/3$691
This Delta deal was found by Cheapflights users on 2/3. 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.
Tue 2/36:00 am
ONT
-
OPO
2 stops20h 30m
Delta
Wed 3/45:00 am
OPO
-
ONT
2 stops25h 37m
Delta
Deal found 2/3$692
This Delta deal was found by Cheapflights users on 2/3. 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 2/117:30 am
ONT
-
OPO
2 stops23h 55m
Delta
Wed 3/45:00 am
OPO
-
ONT
2 stops25h 37m
Delta
Deal found 2/3$698
This Delta deal was found by Cheapflights users on 2/1. 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.
Tue 2/176:00 am
ONT
-
OPO
2 stops25h 25m
Delta
Fri 2/275:00 am
OPO
-
ONT
2 stops25h 37m
Delta
Deal found 2/1$699

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 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$493
(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, 3% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($25 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 4, 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 3/3

8:00 am-9:30 am

2 stops17h 30m

Porto

Tue 3/10

6:00 am-8:50 pm

2 stops21h 50m

$493

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 3/3

8:00 am-9:30 am

2 stops17h 30m

Porto

Thu 3/12

6:00 am-10:18 pm

2 stops23h 18m

$493

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 3/3

8:00 am-9:30 am

2 stops17h 30m

Porto

Wed 3/11

6:00 am-10:18 pm

2 stops23h 18m

$493

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 3/2

6:00 am-10:30 am

2 stops20h 30m

Porto

Wed 3/11

5:00 am-10:33 pm

2 stops24h 33m

$495

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 3/2

6:00 am-10:30 am

2 stops20h 30m

Porto

Fri 3/13

5:00 am-5:12 pm

2 stops19h 12m

$495

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 3/4

6:09 am-9:30 am

2 stops19h 21m

Porto

Wed 3/11

6:00 am-10:18 pm

2 stops23h 18m

$591

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 4/28

6:05 am-9:45 am

2 stops19h 40m

Porto

Tue 5/19

6:00 am-10:59 pm

2 stops24h 59m

$656

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 2/22

6:00 am-9:30 am

2 stops19h 30m

Porto

Fri 3/6

6:00 am-10:18 pm

2 stops24h 18m

$689

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 2/22

6:00 am-9:30 am

2 stops19h 30m

Porto

Thu 3/5

12:30 pm-10:57 pm

2 stops18h 27m

$689

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Thu 3/5

5:15 am-9:30 am

2 stops20h 15m

Porto

Sat 3/14

6:00 am-10:57 pm

2 stops23h 57m

$690

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

Showing 1-10 of 22 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*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 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 $407). Flying from Ontario to Porto in June is currently the most expensive (average of $825). 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 and Delta can get you from Ontario to Porto in just under 17h 30m. Your travel time can differ by up to 3h. The distance from Ontario to Porto is about 5549 mi. This flight may include one or multiple stops.

  • 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 $407). Flying from Ontario to Porto in June is currently the most expensive (average of $825). 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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