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Portugal

$272+ 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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LIS
Jan 2 — Jan 91
Fri 1/2
Fri 1/9
1 adult, Economy
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Cheap 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 December 3, 2025.

This Delta deal was found by Cheapflights users on 11/30. 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 12/107:05 amONT - LIS
2 stops16h 55mDelta
Wed 12/1711:15 amLIS - ONT
2 stops19h 49mDelta
Deal found 11/30$460
This Delta deal was found by Cheapflights users on 11/30. 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 12/107:05 amONT - LIS
2 stops16h 55mDelta
Wed 12/245:30 amLIS - ONT
2 stops25h 03mDelta
Deal found 11/30$471
This United Airlines deal was found by Cheapflights users on 11/30. 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 12/18:38 pmONT - LIS
2 stops28h 42mUnited Airlines
Tue 12/166:10 amLIS - ONT
2 stops19h 27mUnited Airlines
Deal found 11/30$494
This United Airlines deal was found by Cheapflights users on 12/1. 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.
Tue 12/26:00 amONT - LIS
2 stops18h 10mUnited Airlines
Tue 12/95:00 amLIS - ONT
2 stops20h 37mUnited Airlines
Deal found 12/1$497
This United Airlines deal was found by Cheapflights users on 12/2. 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.
Wed 12/36:00 amONT - LIS
2 stops18h 10mUnited Airlines
Wed 12/106:10 amLIS - ONT
2 stops19h 27mUnited Airlines
Deal found 12/2$498
This Delta deal was found by Cheapflights users on 12/2. 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.
Wed 12/36:00 amONT - LIS
2 stops18h 00mDelta
Wed 12/245:30 amLIS - ONT
2 stops25h 03mDelta
Deal found 12/2$506
This United Airlines deal was found by Cheapflights users on 11/30. 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 12/18:38 pmONT - LIS
2 stops28h 42mUnited Airlines
Mon 12/811:20 amLIS - ONT
2 stops38h 17mUnited Airlines
Deal found 11/30$513
This United Airlines deal was found by Cheapflights users on 12/3. 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 12/36:00 amONT - LIS
2 stops18h 10mUnited Airlines
Mon 12/86:10 amLIS - ONT
2 stops19h 27mUnited Airlines
Deal found 12/3$523
This United Airlines deal was found by Cheapflights users on 12/2. 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.
Fri 12/56:00 amONT - LIS
2 stops18h 10mUnited Airlines
Thu 12/2511:55 amLIS - ONT
2 stops18h 30mUnited Airlines
Deal found 12/2$534
This Delta deal was found by Cheapflights users on 12/2. 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.
Thu 12/47:05 amONT - LIS
2 stops16h 55mDelta
Wed 12/245:30 amLIS - ONT
2 stops25h 03mDelta
Deal found 12/2$556
This Delta deal was found by Cheapflights users on 11/30. 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 12/146:00 amONT - LIS
2 stops18h 00mDelta
Wed 12/245:30 amLIS - ONT
2 stops25h 03mDelta
Deal found 11/30$672
This British Airways deal was found by Cheapflights users on 12/2. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:47 amONT - LIS
2 stops22h 53mBritish Airways
Sun 1/116:40 pmLIS - ONT
2 stops30h 42mBritish Airways
Deal found 12/2$701

Find flight deals from Ontario to Portugal

Keep the following information in mind while searching for Ontario to Portugal flight deals. Data was last updated December 3, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$451
(Iberia)

One-way from

$272
(oojo)

Popular in

June

Cheapest in

February

Average price

$1,122
Provider with most accurate pricing for Los Angeles-Lisbon Humberto Delgado flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Lisbon Humberto Delgado flights.
Search Deals
From Ontario to Portugal
Search Deals
One-way flight from Ontario to Portugal
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($176 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 3, 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

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 2/3

7:30 am-10:30 am

2 stops19h 00m

Porto

Wed 3/4

5:00 am-9:05 pm

2 stops24h 05m

$479

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 2/17

7:30 am-10:30 am

2 stops19h 00m

Porto

Tue 2/24

5:00 am-10:37 pm

2 stops25h 37m

$479

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Thu 1/15

6:00 am-2:35 pm

2 stops24h 35m

Lisbon Humberto Delgado

Thu 1/22

10:00 am-9:05 pm

2 stops19h 05m

$482

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Thu 1/15

5:05 am-9:20 am

2 stops20h 15m

Lisbon Humberto Delgado

Sat 1/24

12:20 pm-10:53 pm

2 stops18h 33m

$495

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Thu 1/29

6:00 am-10:30 am

2 stops44h 30m

Porto

Mon 2/2

11:15 am-12:16 pm

2 stops57h 01m

$495

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Thu 1/15

5:05 am-9:20 am

2 stops20h 15m

Lisbon Humberto Delgado

Mon 1/19

5:00 am-5:43 pm

2 stops20h 43m

$496

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Thu 2/12

6:00 am-2:45 pm

2 stops24h 45m

Porto

Thu 2/19

6:00 am-8:50 pm

2 stops22h 50m

$503

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 2/16

6:00 am-2:55 pm

2 stops24h 55m

Porto

Mon 2/23

12:30 pm-10:57 pm

2 stops18h 27m

$503

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Thu 2/12

6:00 am-2:45 pm

2 stops24h 45m

Porto

Wed 2/18

6:00 am-10:57 pm

2 stops24h 57m

$503

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Thu 2/12

6:00 am-2:45 pm

2 stops24h 45m

Porto

Mon 2/23

12:30 pm-10:57 pm

2 stops18h 27m

$503

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/30

Showing 1-10 of 58 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, May is the cheapest month in which you can book a flight from Ontario to Portugal (average of $412). Flying from Ontario to Portugal in June is currently the most expensive (average of $672). 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 December 3, 2025.

It’s optimal to fly from Ontario to Portugal in the evening. By choosing this option you can save up to 38% on the cost of your flight, compared to a flight at noon.

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 December 3, 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
9,063 reviews

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Boarding

7.7

Crew

8.1

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
9,063 reviews
United Airlines
7.4
Good
9,063 reviews

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Boarding

7.7

Crew

8.1

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 19h. Delta provides one of the quickest options available for as low as $479. 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, May is the cheapest month in which you can book a flight from Ontario to Portugal (average of $412). Flying from Ontario to Portugal in June is currently the most expensive (average of $672). 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 December 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$515Average$740FlexibilityNo cancel feeOn-time69%

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