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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 7/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LIS
May 9 — May 161
Sat 5/9
Sat 5/16
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 April 9, 2026.

This Delta deal was found by Cheapflights users on 4/4. 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 11/197:00 am
ONT
-
LIS
2 stops18h 00m
Delta
Tue 11/2411:25 am
LIS
-
ONT
2 stops42h 49m
Delta
Deal found 4/4$720
This Delta deal was found by Cheapflights users on 4/4. 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 11/197:00 am
ONT
-
LIS
2 stops18h 00m
Delta
Thu 11/265:00 am
LIS
-
ONT
2 stops21h 18m
Delta
Deal found 4/4$721
This Delta deal was found by Cheapflights users on 4/4. 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 11/197:00 am
ONT
-
LIS
2 stops18h 00m
Delta
Fri 11/275:30 am
LIS
-
ONT
2 stops18h 42m
Delta
Deal found 4/4$728
This Delta deal was found by Cheapflights users on 4/5. 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 5/511:53 am
ONT
-
LIS
2 stops21h 57m
Delta
Tue 5/125:00 am
LIS
-
ONT
2 stops24h 48m
Delta
Deal found 4/5$750
This United Airlines deal was found by Cheapflights users on 4/8. 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 10/297:00 am
ONT
-
LIS
2 stops20h 15m
United Airlines
Tue 11/101:00 pm
LIS
-
ONT
2 stops41h 26m
United Airlines
Deal found 4/8$766
This KLM deal was found by Cheapflights users on 4/8. 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.
Sat 10/317:00 am
ONT
-
LIS
2 stops18h 00m
KLM
Tue 11/105:00 am
LIS
-
ONT
2 stops25h 14m
KLM
Deal found 4/8$770
This KLM deal was found by Cheapflights users on 4/8. 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.
Sat 10/317:00 am
ONT
-
LIS
2 stops18h 00m
KLM
Mon 11/95:00 am
LIS
-
ONT
2 stops21h 18m
KLM
Deal found 4/8$771
This oojo deal was found by Cheapflights users on 4/8. 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.
Sun 10/181:31 pm
ONT
-
LIS
2 stops36h 34m
British Airways
Sat 10/313:55 pm
LIS
-
ONT
2 stops38h 04m
British Airways
Deal found 4/8$774
This United Airlines deal was found by Cheapflights users on 4/4. 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 10/176:30 pm
ONT
-
OPO
2 stops31h 15m
United Airlines
Thu 10/2211:50 am
OPO
-
ONT
2 stops43h 16m
United Airlines
Deal found 4/4$776
This Delta deal was found by Cheapflights users on 4/8. 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 10/299:55 am
ONT
-
LIS
2 stops22h 15m
Delta
Mon 11/95:30 am
LIS
-
ONT
2 stops18h 42m
Delta
Deal found 4/8$777
This Delta deal was found by Cheapflights users on 4/8. 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.
Fri 10/3010:59 pm
ONT
-
LIS
2 stops27h 01m
Delta
Tue 11/105:30 am
LIS
-
ONT
2 stops18h 42m
Delta
Deal found 4/8$778
This Delta deal was found by Cheapflights users on 4/8. 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.
Fri 10/3010:59 pm
ONT
-
LIS
2 stops27h 01m
Delta
Fri 11/1311:15 am
LIS
-
ONT
2 stops18h 59m
Delta
Deal found 4/8$781

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 9, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$750
(Delta)

One-way from

$376
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$711
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 ($227 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($26 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 9, 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 8/12

5:45 am-8:20 am

2 stops18h 35m

Lisbon Humberto Delgado

Wed 8/19

12:20 pm-10:58 pm

2 stops18h 38m

$791

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 8/19

5:45 am-9:45 am

2 stops20h 00m

Porto

Wed 8/26

9:00 am-10:58 pm

2 stops21h 58m

$865

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sat 8/15

5:45 am-8:20 am

2 stops18h 35m

Lisbon Humberto Delgado

Tue 8/25

10:25 am-10:58 pm

2 stops20h 33m

$886

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Thu 9/17

2:22 pm-8:30 pm

2 stops22h 08m

Porto

Mon 10/12

9:25 pm-6:57 pm

2 stops29h 32m

$923

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 9/14

12:35 pm-8:05 pm

2 stops23h 30m

Porto

Mon 10/5

8:40 pm-6:57 pm

2 stops30h 17m

$952

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sat 6/6

1:29 pm-10:45 am

2 stops37h 16m

Lisbon Humberto Delgado

Thu 6/25

5:00 am-5:19 pm

2 stops20h 19m

$961

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sat 6/6

1:29 pm-10:45 am

2 stops37h 16m

Lisbon Humberto Delgado

Fri 6/26

5:00 am-10:41 pm

2 stops25h 41m

$1,016

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sun 6/7

1:00 pm-10:45 am

2 stops37h 45m

Lisbon Humberto Delgado

Thu 6/25

5:00 am-10:41 pm

2 stops25h 41m

$1,018

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Wed 7/29

11:50 pm-3:35 pm

2 stops55h 45m

Lisbon Humberto Delgado

Tue 8/4

5:55 am-11:11 pm

2 stops25h 16m

$1,023

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sat 7/18

1:18 pm-9:45 am

2 stops36h 27m

Porto

Sat 8/1

11:20 am-10:51 pm

2 stops43h 31m

$1,033

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/4

Showing 1-10 of 60 resultsSorted by cheapest first
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2
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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 $714). 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 9, 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
9,554 reviews

Crew

8.1

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Comfort

7.3

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
9,554 reviews
United Airlines
7.4
Good
9,554 reviews

Crew

8.1

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Comfort

7.3

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 35m. United Airlines provides one of the quickest options available for as low as $791. 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 $714). 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 April 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$515Average$727FlexibilityNo cancel feeOn-time69%

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