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$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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LIS
dic. 20 — dic. 271
sáb. 12/20
sáb. 12/27
1 adult, Economy
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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 noviembre 20, 2025.

This United Airlines deal was found by Cheapflights users on 11/19. 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.
lun. 12/11:40 pmONT - LIS
2 stops35h 40mUnited Airlines
mar. 12/911:20 amLIS - ONT
3 stops43h 29mUnited Airlines
Deal found 11/19$483
This United Airlines deal was found by Cheapflights users on 11/20. 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.
mar. 12/26:00 amONT - LIS
2 stops18h 10mUnited Airlines
mar. 12/166:10 amLIS - ONT
2 stops22h 32mUnited Airlines
Deal found 11/20$498
This United Airlines deal was found by Cheapflights users on 11/18. 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.
mar. 11/256:05 amONT - LIS
2 stops18h 05mUnited Airlines
mar. 12/166:10 amLIS - ONT
2 stops19h 27mUnited Airlines
Deal found 11/18$499
This United Airlines deal was found by Cheapflights users on 11/19. 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.
dom. 12/75:05 amONT - LIS
2 stops19h 05mUnited Airlines
mié. 2/46:10 amLIS - ONT
2 stops22h 48mUnited Airlines
Deal found 11/19$500
This Gotogate deal was found by Cheapflights users on 11/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/276:00 amONT - LIS
2 stops19h 20mMultiple Airlines
jue. 12/46:10 amLIS - ONT
2 stops23h 39mMultiple Airlines
Deal found 11/20$509
This United Airlines deal was found by Cheapflights users on 11/18. 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.
jue. 11/277:00 amONT - LIS
2 stops18h 20mUnited Airlines
vie. 12/126:10 amLIS - ONT
2 stops19h 27mUnited Airlines
Deal found 11/18$518
This United Airlines deal was found by Cheapflights users on 11/20. 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.
jue. 12/46:00 amONT - LIS
2 stops18h 10mUnited Airlines
vie. 12/126:10 amLIS - ONT
2 stops19h 27mUnited Airlines
Deal found 11/20$522
This United Airlines deal was found by Cheapflights users on 11/20. 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.
mié. 12/106:00 amONT - LIS
2 stops18h 10mUnited Airlines
vie. 2/66:10 amLIS - ONT
2 stops24h 43mUnited Airlines
Deal found 11/20$600
This United Airlines deal was found by Cheapflights users on 11/19. 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.
sáb. 12/66:00 amONT - LIS
2 stops18h 55mUnited Airlines
sáb. 2/710:15 amLIS - ONT
2 stops19h 43mUnited Airlines
Deal found 11/19$617
This United Airlines deal was found by Cheapflights users on 11/19. 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.
mié. 12/106:00 amONT - LIS
2 stops18h 10mUnited Airlines
sáb. 3/710:15 amLIS - ONT
2 stops20h 10mUnited Airlines
Deal found 11/19$634
This United Airlines deal was found by Cheapflights users on 11/19. 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.
sáb. 11/296:00 amONT - LIS
2 stops18h 55mUnited Airlines
mié. 12/106:10 amLIS - ONT
2 stops19h 27mUnited Airlines
Deal found 11/19$672
This KLM deal was found by Cheapflights users on 11/18. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/106:00 amONT - FAO
2 stops42h 25mKLM
dom. 12/149:55 amFAO - ONT
2 stops38h 14mKLM
Deal found 11/18$711

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 noviembre 20, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$483
(United Airlines)

One-way from

$286
(Justfly.com)

Popular in

June

Cheapest in

February

Average price

$670
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 ($177 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($29 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 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 noviembre 20, 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

jue. 2/19

5:00 am-7:55 am

2 stops18h 55m

Lisbon Humberto Delgado

mar. 2/24

5:00 am-5:41 pm

2 stops20h 41m

$493

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

jue. 1/29

6:10 am-8:10 am

2 stops18h 00m

Lisbon Humberto Delgado

lun. 2/2

11:20 am-12:47 pm

2 stops33h 27m

$494

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

mar. 1/13

6:00 am-9:20 am

2 stops19h 20m

Lisbon Humberto Delgado

mié. 1/21

6:10 am-8:58 pm

2 stops22h 48m

$495

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

mar. 2/17

8:00 am-8:10 am

2 stops16h 10m

Lisbon Humberto Delgado

mar. 2/24

5:00 am-5:41 pm

2 stops20h 41m

$497

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

mar. 1/6

6:10 am-8:10 am

2 stops18h 00m

Lisbon Humberto Delgado

mar. 2/10

5:00 am-5:43 pm

2 stops20h 43m

$497

OntarioPorto

ONT - OPO

ONTOPO

Ontario

jue. 1/29

6:00 am-3:25 pm

2 stops25h 25m

Porto

lun. 2/2

6:30 am-12:16 pm

2 stops61h 46m

$498

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

mar. 12/2

6:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

mar. 12/16

6:10 am-8:42 pm

2 stops22h 32m

$498

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

mié. 1/14

5:05 am-8:10 am

2 stops19h 05m

Lisbon Humberto Delgado

lun. 1/26

6:10 am-8:58 pm

2 stops22h 48m

$500

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

mar. 1/6

6:10 am-8:10 am

2 stops18h 00m

Lisbon Humberto Delgado

jue. 1/15

6:10 am-10:53 pm

2 stops24h 43m

$500

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

vie. 1/23

5:05 am-8:10 am

2 stops19h 05m

Lisbon Humberto Delgado

vie. 1/30

6:10 am-5:43 pm

2 stops19h 33m

$500

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/18

Showing 1-10 of 48 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 $671). 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 noviembre 20, 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 noviembre 20, 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
9,029 reviews

Overall

7.4

Entertainment

7.1

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

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
9,029 reviews
United Airlines
7.4
Good
9,029 reviews

Overall

7.4

Entertainment

7.1

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

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 18h 55m. United Airlines provides one of the quickest options available for as low as $493. Airlines will cover a distance of 5634 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Ontario to Portugal one-way?

    $287 is the cheapest one-way deal found within the past few days, from Iberia. You may also be able to find cheap deals on British Airways and United Airlines, with prices starting from $289 and $292, respectively.

  • 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 $671). 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.

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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 noviembre 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$515Average$740FlexibilityNo cancel feeOn-time69%

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