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$443+ 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — OPO
Nov 19 — Nov 261
Wed 11/19
Wed 11/26
1 adult, Economy
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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 October 20, 2025.

This Delta deal was found by Cheapflights users on 10/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/156:45 amONT - OPO
2 stops19h 45mDelta
Mon 11/246:30 amOPO - ONT
2 stops49h 22mDelta
Deal found 10/18$541
This Delta deal was found by Cheapflights users on 10/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/257:05 amONT - OPO
2 stops24h 20mDelta
Wed 12/311:15 amOPO - ONT
2 stops36h 54mDelta
Deal found 10/18$547
This United Airlines deal was found by Cheapflights users on 10/17. 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 12/25:05 amONT - OPO
2 stops25h 40mUnited Airlines
Tue 12/96:00 amOPO - ONT
3 stops24h 49mUnited Airlines
Deal found 10/17$552
This Delta deal was found by Cheapflights users on 10/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1911:44 amONT - OPO
2 stops26h 41mDelta
Mon 11/246:30 amOPO - ONT
2 stops49h 22mDelta
Deal found 10/18$572
This United Airlines deal was found by Cheapflights users on 10/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/147:00 amONT - OPO
2 stops18h 30mUnited Airlines
Tue 11/186:00 amOPO - ONT
2 stops20h 36mUnited Airlines
Deal found 10/19$737
This United Airlines deal was found by Cheapflights users on 10/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/86:05 amONT - OPO
2 stops19h 25mUnited Airlines
Sat 11/156:00 amOPO - ONT
2 stops22h 44mUnited Airlines
Deal found 10/19$837
This United Airlines deal was found by Cheapflights users on 10/19. 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 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 10/19$887
This United Airlines deal was found by Cheapflights users on 10/18. 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.
Sat 10/259:36 amONT - OPO
2 stops16h 54mUnited Airlines
Fri 11/76:00 amOPO - ONT
2 stops48h 31mUnited Airlines
Deal found 10/18$1,057
This United Airlines deal was found by Cheapflights users on 10/18. 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.
Mon 11/245:05 amONT - OPO
2 stops20h 25mUnited Airlines
Sun 11/3012:30 pmOPO - ONT
2 stops40h 14mUnited Airlines
Deal found 10/18$1,197
This Iberia deal was found by Cheapflights users on 10/19. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/87:00 amONT - OPO
2 stops16h 40mIberia
Sat 11/228:20 amOPO - ONT
2 stops22h 03mIberia
Deal found 10/19$1,233
This United Airlines deal was found by Cheapflights users on 10/18. 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.
Sun 10/199:36 amONT - OPO
2 stops16h 09mUnited Airlines
Sun 10/266:00 amOPO - ONT
2 stops21h 44mUnited Airlines
Deal found 10/18$1,297

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 October 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$541
(Delta)

One-way from

$443
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$742
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 ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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 October 20, 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 12/2

6:00 am-10:30 am

2 stops20h 30m

Porto

Tue 12/9

6:05 am-11:04 pm

2 stops24h 59m

$541

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sat 11/15

6:45 am-10:30 am

2 stops19h 45m

Porto

Mon 11/24

6:30 am-11:52 pm

2 stops49h 22m

$541

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 11/25

7:05 am-3:25 pm

2 stops24h 20m

Porto

Wed 12/3

11:15 am-4:09 pm

2 stops36h 54m

$547

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 12/2

5:05 am-2:45 pm

2 stops25h 40m

Porto

Tue 12/9

6:00 am-10:49 pm

3 stops24h 49m

$552

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sat 2/21

6:00 am-10:30 am

2 stops20h 30m

Porto

Mon 3/2

4:10 pm-4:19 pm

2 stops32h 09m

$566

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 2/23

6:00 am-10:30 am

2 stops20h 30m

Porto

Wed 3/4

4:10 pm-9:14 pm

2 stops37h 04m

$566

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 2/23

6:00 am-10:30 am

2 stops20h 30m

Porto

Tue 3/3

6:05 am-9:14 pm

2 stops23h 09m

$566

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 2/3

6:00 am-10:30 am

2 stops20h 30m

Porto

Wed 3/4

6:00 am-9:14 pm

2 stops23h 14m

$566

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 2/22

6:00 am-10:30 am

2 stops20h 30m

Porto

Tue 3/3

6:05 am-9:14 pm

2 stops23h 09m

$566

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 11/19

11:44 am-10:25 pm

2 stops26h 41m

Porto

Mon 11/24

6:30 am-11:52 pm

2 stops49h 22m

$572

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/19

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 October.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 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 $411). 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.

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 October 20, 2025.

One of the essential ways to save on airfare from Ontario to Porto is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 45% on airfare.

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?

    Delta and United Airlines can get you from Ontario to Porto in just under 20h 30m. Your travel time can differ by up to 5h 10m. 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 $411). 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
Aveiro
Arcos de Valdevez
Coimbra

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