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Portugal

$286+ Cheap flights from Ontario (ONT) to Portugal

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 12/6. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LIS
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap flight deals from Ontario to Portugal

Keep the following information in mind while searching for Ontario to Portugal flight deals. Data was last updated September 16, 2025.

Round-trip from

$485
(Delta)

One-way from

$286
(Air Canada)

Popular in

December

Cheapest in

February

Average price

$823
From Ontario to Portugal
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One-way flight from Ontario to Portugal
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Highest demand for flights based on searches. 8% potential increase in price ($86 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($28 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 Portugal

Cheapest flights from Ontario to Portugal
Explore the most affordable flight options available from Ontario to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This United Airlines deal was found by Cheapflights users on 9/14. 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 12/36:00 amONT - LIS
2 stops18h 10mUnited Airlines
Wed 12/1711:00 amLIS - ONT
2 stops42h 52mUnited Airlines
Deal found 9/14$494
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.
Sun 11/27:35 amONT - LIS
2 stops23h 35mDelta
Thu 11/135:30 amLIS - ONT
2 stops26h 22mDelta
Deal found 9/15$510
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.
Tue 11/117:00 amONT - LIS
2 stops17h 10mUnited Airlines
Thu 11/2010:15 amLIS - ONT
2 stops18h 29mUnited Airlines
Deal found 9/15$511
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.
Mon 12/86:00 amONT - LIS
2 stops18h 10mUnited Airlines
Mon 12/1510:15 amLIS - ONT
2 stops18h 27mUnited Airlines
Deal found 9/15$561
This United Airlines deal was found by Cheapflights users on 9/14. 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 12/86:00 amONT - LIS
2 stops18h 10mUnited Airlines
Mon 12/2211:55 amLIS - ONT
2 stops18h 30mUnited Airlines
Deal found 9/14$592
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.
Sat 11/226:00 amONT - LIS
2 stops18h 55mUnited Airlines
Sat 11/2911:20 amLIS - ONT
2 stops43h 11mUnited Airlines
Deal found 9/15$623
This United Airlines deal was found by Cheapflights users on 9/14. 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 10/216:00 amONT - LIS
2 stops18h 20mUnited Airlines
Tue 10/285:00 amLIS - ONT
2 stops19h 34mUnited Airlines
Deal found 9/14$632
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.
Sun 11/21:29 pmONT - LIS
2 stops26h 01mUnited Airlines
Thu 11/1310:15 amLIS - ONT
3 stops44h 36mUnited Airlines
Deal found 9/15$634
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.
Tue 10/79:50 amONT - LIS
2 stops24h 00mDelta
Fri 10/245:00 amLIS - ONT
2 stops25h 41mDelta
Deal found 9/15$635
This United Airlines deal was found by Cheapflights users on 9/14. 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 11/235:05 amONT - LIS
2 stops19h 05mUnited Airlines
Mon 12/810:15 amLIS - ONT
2 stops18h 27mUnited Airlines
Deal found 9/14$644
This United Airlines deal was found by Cheapflights users on 9/14. 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 12/136:00 amONT - LIS
2 stops18h 10mUnited Airlines
Mon 12/2211:55 amLIS - ONT
2 stops18h 30mUnited Airlines
Deal found 9/14$672
This KLM 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3011:48 amONT - FAO
2 stops37h 47mKLM
Thu 11/67:05 pmFAO - ONT
2 stops32h 14mKLM
Deal found 9/15$720

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Portugal 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 16, 2025.
Use the filters below to find and compare flights from Ontario to Portugal that are best for you.

Fly from

Ontario

Fly to

Portugal

Route

Depart

Return

Price

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Wed 1/7

7:00 am-8:10 am

2 stops17h 10m

Lisbon Humberto Delgado

Wed 1/21

11:20 am-10:26 pm

2 stops43h 06m

$494

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Wed 2/25

6:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

Fri 3/6

5:00 am-8:17 pm

2 stops23h 17m

$504

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sun 11/2

7:35 am-3:10 pm

2 stops23h 35m

Lisbon Humberto Delgado

Thu 11/13

5:30 am-11:04 pm

2 stops25h 34m

$510

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 11/18

7:00 am-9:20 am

2 stops18h 20m

Lisbon Humberto Delgado

Thu 11/27

6:10 am-5:34 pm

2 stops19h 24m

$510

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 11/11

7:00 am-8:10 am

2 stops17h 10m

Lisbon Humberto Delgado

Thu 11/20

10:15 am-10:31 pm

2 stops20h 16m

$511

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Wed 12/3

6:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

Wed 12/17

10:15 am-9:49 pm

2 stops19h 34m

$511

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Wed 3/11

1:00 pm-1:20 pm

2 stops17h 20m

Lisbon Humberto Delgado

Fri 3/20

11:55 am-6:00 pm

2 stops37h 05m

$540

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Mon 3/2

6:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

Sun 3/8

5:00 am-7:17 pm

2 stops22h 17m

$554

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sun 3/1

6:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

Sun 3/8

5:00 am-7:17 pm

2 stops22h 17m

$554

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Mon 12/8

6:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

Mon 12/15

10:15 am-8:42 pm

2 stops18h 27m

$561

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 40 results
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Best time to book a flight from Ontario to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal 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 Portugal

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Portugal (average of $612). Flying from Ontario to Portugal in June is currently the most expensive (average of $1,127). 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 PT?

Find hourly flight availability from Ontario to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

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

Reviews of airlines servicing Portugal

Get insights into the airlines that provide service to Portugal. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Portugal. Reviews last updated September 16, 2025.
See what other customers who have flown with United Airlines from Ontario to Portugal have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,929 reviews

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,929 reviews
United Airlines
7.4
Good
8,929 reviews

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Ontario to Portugal. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Portugal?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Portugal from Ontario.

  • How long is the flight from Ontario to Portugal?

    A quick flight from Ontario to Portugal can take about 17h 03m. United Airlines provides one of the quickest options available for as low as $578. Airlines will cover a distance of 5549 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Ontario to Portugal?

    When deciding which route to take from Ontario to Portugal consider Ontario - Lisbon Humberto Delgado, Ontario - Porto or Ontario - Faro as they are the most popular.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Ontario to Portugal (average of $612). Flying from Ontario to Portugal in June is currently the most expensive (average of $1,127). 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

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Top airline flying from Ontario to Portugal

Discover the top airline that operate flights from Ontario to Portugal. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$568Average$1,023FlexibilityNo cancel feeOn-time69%

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