HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portugal

$266+ 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 7/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LIS
Mar 20 — Mar 271
Fri 3/20
Fri 3/27
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Portugal with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 February 18, 2026.

This United Airlines deal was found by Cheapflights users on 2/17. 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 4/217:00 am
ONT
-
OPO
2 stops18h 45m
United Airlines
Tue 4/286:00 am
OPO
-
ONT
2 stops24h 26m
United Airlines
Deal found 2/17$492
This United Airlines deal was found by Cheapflights users on 2/14. 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 10/276:00 am
ONT
-
LIS
2 stops20h 20m
United Airlines
Tue 11/106:10 am
LIS
-
ONT
2 stops19h 37m
United Airlines
Deal found 2/14$501
This United Airlines deal was found by Cheapflights users on 2/16. 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 3/38:00 am
ONT
-
LIS
2 stops16h 10m
United Airlines
Wed 3/116:10 am
LIS
-
ONT
2 stops23h 08m
United Airlines
Deal found 2/16$502
This oojo deal was found by Cheapflights users on 2/17. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/184:52 pm
ONT
-
LIS
2 stops33h 13m
British Airways
Sat 5/26:55 pm
LIS
-
ONT
2 stops35h 04m
British Airways
Deal found 2/17$509
This United Airlines deal was found by Cheapflights users on 2/15. 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 4/216:05 am
ONT
-
OPO
2 stops19h 40m
United Airlines
Wed 4/2912:35 pm
OPO
-
ONT
2 stops41h 23m
United Airlines
Deal found 2/15$511
This United Airlines deal was found by Cheapflights users on 2/17. 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 4/216:05 am
ONT
-
LIS
2 stops18h 15m
United Airlines
Tue 4/2810:25 am
LIS
-
ONT
2 stops20h 01m
United Airlines
Deal found 2/17$513
This United Airlines deal was found by Cheapflights users on 2/14. 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 4/146:05 am
ONT
-
LIS
2 stops18h 15m
United Airlines
Mon 4/2011:25 am
LIS
-
ONT
2 stops33h 13m
United Airlines
Deal found 2/14$521
This United Airlines deal was found by Cheapflights users on 2/14. 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 4/147:00 am
ONT
-
LIS
2 stops17h 20m
United Airlines
Tue 5/1211:25 am
LIS
-
ONT
2 stops43h 05m
United Airlines
Deal found 2/14$523
This United Airlines deal was found by Cheapflights users on 2/15. 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 2/178:00 am
ONT
-
LIS
2 stops16h 10m
United Airlines
Sat 3/711:55 am
LIS
-
ONT
2 stops18h 56m
United Airlines
Deal found 2/15$537
This oojo deal was found by Cheapflights users on 2/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/65:02 pm
ONT
-
LIS
2 stops33h 03m
British Airways
Mon 4/137:10 am
LIS
-
ONT
2 stops41h 12m
British Airways
Deal found 2/14$545
This KLM deal was found by Cheapflights users on 2/16. 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.
Tue 3/31:15 pm
ONT
-
FAO
2 stops20h 50m
KLM
Wed 3/116:55 pm
FAO
-
ONT
2 stops28h 33m
KLM
Deal found 2/16$549
This Delta deal was found by Cheapflights users on 2/15. 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.
Thu 2/196:00 am
ONT
-
LIS
2 stops18h 55m
Delta
Thu 3/55:30 am
LIS
-
ONT
2 stops18h 32m
Delta
Deal found 2/15$559

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 February 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$492
(United Airlines)

One-way from

$266
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$609
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. 22% potential increase in price ($225 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 18, 2026.
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 4/21

7:00 am-9:45 am

2 stops18h 45m

Porto

Tue 4/28

6:00 am-10:26 pm

2 stops24h 26m

$492

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Wed 4/22

6:05 am-8:20 am

2 stops18h 15m

Lisbon Humberto Delgado

Wed 4/29

6:15 am-10:45 pm

2 stops24h 30m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 3/3

8:00 am-10:15 am

2 stops18h 15m

Lisbon Humberto Delgado

Wed 3/11

6:10 am-10:57 pm

2 stops23h 47m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 4/14

6:05 am-8:20 am

2 stops18h 15m

Lisbon Humberto Delgado

Wed 4/22

6:15 am-5:47 pm

2 stops19h 32m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Wed 4/15

6:05 am-8:20 am

2 stops18h 15m

Lisbon Humberto Delgado

Wed 4/29

6:15 am-10:45 pm

2 stops24h 30m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 4/14

6:05 am-8:20 am

2 stops18h 15m

Lisbon Humberto Delgado

Tue 4/21

6:15 am-12:20 pm

2 stops38h 05m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sat 4/18

4:52 pm-10:05 am

2 stops33h 13m

Lisbon Humberto Delgado

Fri 5/1

6:55 pm-6:37 pm

2 stops31h 42m

$509

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 4/21

6:05 am-9:45 am

2 stops19h 40m

Porto

Wed 4/29

12:35 pm-9:58 pm

2 stops41h 23m

$511

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 4/21

6:05 am-8:20 am

2 stops18h 15m

Lisbon Humberto Delgado

Tue 4/28

10:25 am-10:26 pm

2 stops20h 01m

$513

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 3/17

6:00 am-8:10 am

2 stops19h 10m

Lisbon Humberto Delgado

Tue 3/24

10:15 am-10:57 pm

2 stops19h 42m

$513

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/16

Showing 1-10 of 53 results
1
2
3
...
6

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 $404). Flying from Ontario to Portugal in June is currently the most expensive (average of $712). 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.

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 February 18, 2026.
See what other customers who have flown with Delta and 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.
Delta
7.9
Good
8,208 reviews

Crew

8.5

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Overall

7.9

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
7.9
Good
8,208 reviews
Delta
7.9
Good
8,208 reviews

Crew

8.5

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Overall

7.9

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
9,315 reviews
Delta
7.9
Good
8,208 reviews

Crew

8.5

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Overall

7.9

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 45m. United Airlines provides one of the quickest options available for as low as $492. 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 $404). Flying from Ontario to Portugal in June is currently the most expensive (average of $712). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Portugal

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Heathrow flights
San Francisco to Heathrow flights
Los Angeles to Charles de Gaulle flights
San Francisco to Charles de Gaulle flights
Los Angeles to Leonardo da Vinci/Fiumicino flights
San Francisco to Leonardo da Vinci/Fiumicino flights
Los Angeles to Istanbul flights
Los Angeles to Gatwick flights
Los Angeles to Madrid flights
San Francisco to Istanbul flights
Los Angeles to Frankfurt flights
Los Angeles to Stansted flights
San Francisco to Gatwick flights
Los Angeles to Amsterdam flights
Los Angeles to London City flights
San Francisco to Barcelona-El Prat flights
Los Angeles to Barcelona-El Prat flights
San Francisco to Amsterdam flights
Los Angeles to Orly flights
San Francisco to London City flights
San Francisco to Stansted flights
Los Angeles to Dublin flights
San Francisco to Orly flights
San Francisco to Dublin flights
Los Angeles to Athens flights
San Francisco to Lisbon flights
San Diego to Heathrow flights
San Francisco to Madrid flights
Ontario to Heathrow flights
Los Angeles to Malpensa flights
San Francisco to Athens flights
San Francisco to Frankfurt flights
Los Angeles to Lisbon flights
Ontario to Charles de Gaulle flights
San Francisco to Zurich flights
Los Angeles to Copenhagen flights
Los Angeles to Linate flights
Los Angeles to Zurich flights
Ontario to Leonardo da Vinci/Fiumicino flights
San Francisco to Malpensa flights
Los Angeles to Frederic Chopin flights
Burbank to Charles de Gaulle flights
San Francisco to Linate flights
San Francisco to Munich flights
Santa Ana to Leonardo da Vinci/Fiumicino flights
Santa Ana to Charles de Gaulle flights
Los Angeles to Luton flights
Los Angeles to Beauvais-Tille flights
Las Vegas to Heathrow flights
Los Angeles to Sabiha Gokcen flights

Top 2 airlines flying from Ontario to Portugal

Discover the top 2 airlines 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 February 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$515Average$727FlexibilityNo cancel feeOn-time69%
DeltaCheapest$582Average$844FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.