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$236+ 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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — OPO
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
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 January 8, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$461
(American Airlines)

One-way from

$271
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$671
Provider with most accurate pricing for Ontario-Porto flight deals.
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Provider most trusted by Cheapflights users for Ontario-Porto flights.
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From Ontario to Porto
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One-way flight from Ontario to Porto
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High demand for flights, 4% 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 January 2026
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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 January 8, 2026.

This American Airlines deal was found by Cheapflights users on 1/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/36:00 amONT - OPO
2 stops21h 45mAmerican Airlines
Wed 3/48:40 pmOPO - ONT
2 stops21h 26mAmerican Airlines
Deal found 1/8$461
This British Airways deal was found by Cheapflights users on 1/7. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/310:58 amONT - OPO
2 stops21h 02mMultiple Airlines
Wed 3/48:40 pmOPO - ONT
2 stops32h 44mMultiple Airlines
Deal found 1/7$472
This United Airlines deal was found by Cheapflights users on 1/6. 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 2/216:00 amONT - OPO
2 stops19h 30mUnited Airlines
Sat 2/2812:30 pmOPO - ONT
2 stops32h 08mUnited Airlines
Deal found 1/6$492
This United Airlines deal was found by Cheapflights users on 1/8. 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 2/225:00 amONT - OPO
2 stops26h 15mUnited Airlines
Sun 3/112:30 pmOPO - ONT
2 stops18h 27mUnited Airlines
Deal found 1/8$507
This Iberia deal was found by Cheapflights users on 1/6. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/257:16 amONT - OPO
2 stops16h 24mIberia
Mon 2/28:40 pmOPO - ONT
2 stops21h 28mIberia
Deal found 1/6$524
This United Airlines deal was found by Cheapflights users on 1/8. 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 4/246:00 amONT - OPO
2 stops19h 45mUnited Airlines
Sun 5/36:00 amOPO - ONT
2 stops24h 26mUnited Airlines
Deal found 1/8$687
This United Airlines deal was found by Cheapflights users on 1/8. 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 2/286:00 amONT - OPO
2 stops19h 30mUnited Airlines
Sun 3/812:35 pmOPO - ONT
2 stops41h 01mUnited Airlines
Deal found 1/8$714
This oojo deal was found by Cheapflights users on 1/7. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/2110:58 amONT - OPO
2 stops16h 47mIberia
Sun 1/2512:25 pmOPO - ONT
2 stops42h 23mIberia
Deal found 1/7$716
This Iberia deal was found by Cheapflights users on 1/6. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/296:00 amONT - OPO
2 stops26h 00mIberia
Mon 2/28:40 pmOPO - ONT
2 stops34h 08mIberia
Deal found 1/6$750
This oojo deal was found by Cheapflights users on 1/6. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/1910:58 amONT - OPO
2 stops16h 47mIberia
Mon 1/2612:25 pmOPO - ONT
2 stops42h 23mIberia
Deal found 1/6$894
This United Airlines deal was found by Cheapflights users on 1/8. 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 5/227:00 amONT - OPO
2 stops39h 55mUnited Airlines
Mon 6/812:00 pmOPO - ONT
2 stops43h 06mUnited Airlines
Deal found 1/8$1,072
This United Airlines deal was found by Cheapflights users on 1/8. 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 4/111:34 pmONT - OPO
2 stops36h 11mUnited Airlines
Sun 4/196:00 amOPO - ONT
2 stops23h 50mUnited Airlines
Deal found 1/8$1,169

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 January 8, 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 2/3

6:00 am-11:45 am

2 stops21h 45m

Porto

Wed 3/4

8:40 pm-10:06 am

2 stops21h 26m

$461

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 2/3

10:58 am-4:00 pm

2 stops21h 02m

Porto

Wed 3/4

8:40 pm-9:24 pm

2 stops32h 44m

$472

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sat 2/21

6:00 am-9:30 am

2 stops19h 30m

Porto

Sat 2/28

12:30 pm-12:38 pm

2 stops32h 08m

$492

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 2/22

5:00 am-3:15 pm

2 stops26h 15m

Porto

Sun 3/1

12:30 pm-10:57 pm

2 stops18h 27m

$507

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 1/25

7:16 am-7:40 am

2 stops16h 24m

Porto

Mon 2/2

8:40 pm-10:08 am

2 stops21h 28m

$524

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sat 2/28

6:00 am-9:30 am

2 stops19h 30m

Porto

Sun 3/8

12:35 pm-10:36 pm

2 stops41h 01m

$714

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 1/21

10:58 am-11:45 am

2 stops16h 47m

Porto

Sun 1/25

12:25 pm-10:48 pm

2 stops42h 23m

$716

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Thu 1/29

6:00 am-4:00 pm

2 stops26h 00m

Porto

Mon 2/2

8:40 pm-10:48 pm

2 stops34h 08m

$750

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 1/19

10:58 am-11:45 am

2 stops16h 47m

Porto

Mon 1/26

12:25 pm-10:48 pm

2 stops42h 23m

$894

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Fri 5/22

7:00 am-6:55 am

2 stops39h 55m

Porto

Mon 6/8

12:00 pm-11:06 pm

2 stops43h 06m

$1,072

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

Showing 1-10 of 24 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 January.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Porto flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 $402). Flying from Ontario to Porto in June is currently the most expensive (average of $826). 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?

    American Airlines and United Airlines can get you from Ontario to Porto in just under 19h 30m. Your travel time can differ by up to 2h 15m. 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 $402). Flying from Ontario to Porto in June is currently the most expensive (average of $826). 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
Vila Nova de Gaia

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