HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portugal

$376+ 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 7/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LIS
May 2 — May 91
Sat 5/2
Sat 5/9
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 April 2, 2026.

This American Airlines deal was found by Cheapflights users on 3/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:19 pm
ONT
-
LIS
2 stops19h 26m
American Airlines
Wed 4/298:55 am
LIS
-
ONT
2 stops21h 41m
American Airlines
Deal found 3/30$705
This United Airlines deal was found by Cheapflights users on 3/31. 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 12/66:02 am
ONT
-
LIS
2 stops18h 08m
United Airlines
Sat 12/1911:20 am
LIS
-
ONT
2 stops43h 06m
United Airlines
Deal found 3/31$711
This United Airlines deal was found by Cheapflights users on 3/31. 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 11/237:00 am
ONT
-
OPO
2 stops18h 30m
United Airlines
Thu 12/312:30 pm
OPO
-
ONT
2 stops18h 36m
United Airlines
Deal found 3/31$746
This Delta deal was found by Cheapflights users on 3/29. 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 5/611:53 am
ONT
-
LIS
2 stops21h 57m
Delta
Wed 5/135:00 am
LIS
-
ONT
2 stops25h 34m
Delta
Deal found 3/29$750
This Delta deal was found by Cheapflights users on 3/29. 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 5/71:35 pm
ONT
-
LIS
2 stops35h 15m
Delta
Tue 5/125:00 am
LIS
-
ONT
2 stops25h 34m
Delta
Deal found 3/29$752
This oojo deal was found by Cheapflights users on 3/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/294:45 pm
ONT
-
LIS
2 stops21h 00m
British Airways
Tue 1/57:40 pm
LIS
-
ONT
2 stops34h 21m
British Airways
Deal found 3/30$760
This United Airlines deal was found by Cheapflights users on 3/29. 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.
Thu 4/165:10 am
ONT
-
LIS
2 stops33h 35m
United Airlines
Mon 5/41:00 pm
LIS
-
ONT
2 stops39h 36m
United Airlines
Deal found 3/29$766
This oojo deal was found by Cheapflights users on 3/28. 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.
Tue 10/272:22 pm
ONT
-
LIS
2 stops20h 18m
British Airways
Fri 11/67:05 am
LIS
-
ONT
2 stops22h 54m
British Airways
Deal found 3/28$775
This KLM deal was found by Cheapflights users on 3/29. 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.
Wed 5/131:35 pm
ONT
-
LIS
2 stops21h 10m
KLM
Wed 5/205:00 am
LIS
-
ONT
2 stops19h 17m
KLM
Deal found 3/29$785
This KAYAK deal was found by Cheapflights users on 3/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:00 am
ONT
-
LIS
2 stops22h 40m
Lufthansa
Tue 5/512:20 pm
LIS
-
ONT
2 stops18h 15m
Lufthansa
Deal found 3/29$788
This Trip.com deal was found by Cheapflights users on 4/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/410:25 pm
ONT
-
LIS
2 stops25h 35m
Multiple Airlines
Fri 4/1710:00 am
LIS
-
ONT
2 stops19h 00m
Multiple Airlines
Deal found 4/1$789
This Trip.com deal was found by Cheapflights users on 4/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/410:25 pm
ONT
-
LIS
2 stops25h 35m
KLM
Fri 4/1710:00 am
LIS
-
ONT
2 stops19h 00m
KLM
Deal found 4/1$797

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 April 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$705
(American Airlines)

One-way from

$376
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$735
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 ($222 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 2, 2026.
Use the filters below to find and compare flights from Ontario to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Wed 5/13

1:35 pm-6:45 pm

2 stops21h 10m

Lisbon Humberto Delgado

Wed 5/20

5:00 am-4:17 pm

2 stops19h 17m

$785

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sun 9/13

7:00 am-5:50 pm

2 stops26h 50m

Lisbon Humberto Delgado

Tue 9/22

11:55 am-5:16 pm

2 stops37h 21m

$865

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sat 9/5

5:45 am-6:55 am

2 stops41h 10m

Porto

Tue 10/13

12:15 pm-10:26 pm

2 stops42h 11m

$898

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 8/30

5:45 am-6:55 am

2 stops17h 10m

Porto

Thu 9/17

9:00 am-8:52 pm

2 stops19h 52m

$906

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sat 5/30

10:00 pm-10:45 am

2 stops52h 45m

Lisbon Humberto Delgado

Mon 6/8

11:55 am-4:42 pm

2 stops36h 47m

$961

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sun 5/31

9:50 am-10:45 am

2 stops40h 55m

Lisbon Humberto Delgado

Mon 6/8

11:55 am-4:42 pm

2 stops36h 47m

$961

OntarioFaro

ONT - FAO

ONTFAO

Ontario

Sat 4/18

7:30 am-6:05 pm

2 stops26h 35m

Faro

Fri 5/1

7:40 pm-6:37 pm

2 stops30h 57m

$998

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Fri 9/4

11:50 pm-9:50 am

2 stops50h 00m

Lisbon Humberto Delgado

Sat 9/19

5:55 am-11:16 am

2 stops37h 21m

$1,023

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Thu 4/16

5:10 am-9:20 am

3 stops44h 10m

Lisbon Humberto Delgado

Mon 5/4

1:00 pm-8:36 pm

2 stops39h 36m

$1,033

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 5/26

7:05 am-10:45 am

2 stops19h 40m

Lisbon Humberto Delgado

Tue 6/9

5:35 am-4:42 pm

2 stops19h 07m

$1,037

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/29

Showing 1-10 of 53 resultsSorted by cheapest first
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, January is the cheapest month in which you can book a flight from Ontario to Portugal (average of $431). 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 April 2, 2026.
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
9,529 reviews

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

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
9,529 reviews
United Airlines
7.4
Good
9,529 reviews

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

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 21h 10m. KLM provides one of the quickest options available for as low as $785. 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 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 $431). 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
Los Angeles to Charles de Gaulle flights
Los Angeles to Leonardo da Vinci/Fiumicino flights
San Francisco to Heathrow flights
San Francisco to Charles de Gaulle flights
San Francisco to Leonardo da Vinci/Fiumicino flights
San Francisco to Barcelona-El Prat flights
Los Angeles to Barcelona-El Prat flights
Los Angeles to Madrid flights
Los Angeles to Istanbul flights
Los Angeles to Stansted flights
Los Angeles to Gatwick flights
Los Angeles to Frankfurt flights
Los Angeles to London City flights
San Francisco to Gatwick flights
San Francisco to Dublin flights
Los Angeles to Amsterdam flights
Los Angeles to Dublin flights
San Francisco to Stansted flights
San Francisco to London City flights
San Francisco to Lisbon flights
San Francisco to Istanbul flights
San Francisco to Frankfurt flights
Los Angeles to Athens flights
Los Angeles to Lisbon flights
San Francisco to Amsterdam flights
Ontario to Heathrow flights
San Francisco to Athens flights
Los Angeles to Zurich flights
Los Angeles to Luton flights
San Francisco to Malpensa flights
San Diego to Heathrow flights
San Francisco to Madrid flights
San Francisco to Zurich flights
Los Angeles to Copenhagen flights
Los Angeles to Malpensa flights
Los Angeles to Orly flights
San Francisco to Linate flights
San Francisco to Copenhagen flights
San Francisco to Munich flights
Los Angeles to Munich flights
Los Angeles to Frederic Chopin flights
Ontario to Leonardo da Vinci/Fiumicino flights

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 April 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$515Average$727FlexibilityNo cancel feeOn-time69%

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.