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Portugal

$250+ 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 5/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LIS
Feb 26 — Mar 51
Thu 2/26
Thu 3/5
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 January 27, 2026.

This United Airlines deal was found by Cheapflights users on 1/27. 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 3/26:00 am
ONT
-
OPO
2 stops19h 30m
United Airlines
Tue 3/106:00 am
OPO
-
ONT
2 stops23h 18m
United Airlines
Deal found 1/27$492
This United Airlines deal was found by Cheapflights users on 1/25. 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
Thu 3/126:10 am
LIS
-
ONT
2 stops23h 47m
United Airlines
Deal found 1/25$497
This United Airlines deal was found by Cheapflights users on 1/27. 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 2/38:00 am
ONT
-
LIS
2 stops16h 10m
United Airlines
Tue 2/105:00 am
LIS
-
ONT
2 stops20h 43m
United Airlines
Deal found 1/27$500
This United Airlines deal was found by Cheapflights users on 1/26. 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
Tue 4/286:15 am
LIS
-
ONT
2 stops19h 47m
United Airlines
Deal found 1/26$502
This oojo deal was found by Cheapflights users on 1/26. 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.
Thu 2/265:02 pm
ONT
-
LIS
2 stops16h 58m
British Airways
Tue 3/107:05 am
LIS
-
ONT
2 stops22h 02m
British Airways
Deal found 1/26$508
This oojo deal was found by Cheapflights users on 1/27. 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 11/167:00 am
ONT
-
LIS
2 stops23h 55m
British Airways
Wed 11/253:55 pm
LIS
-
ONT
2 stops38h 04m
British Airways
Deal found 1/27$509
This United Airlines deal was found by Cheapflights users on 1/25. 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 3/45:00 am
ONT
-
LIS
3 stops21h 15m
United Airlines
Sun 3/811:55 am
LIS
-
ONT
2 stops39h 55m
United Airlines
Deal found 1/25$517
This United Airlines deal was found by Cheapflights users on 1/25. 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 5/55:00 am
ONT
-
LIS
2 stops21h 30m
United Airlines
Tue 5/1911:25 am
LIS
-
ONT
2 stops38h 27m
United Airlines
Deal found 1/25$522
This United Airlines deal was found by Cheapflights users on 1/25. 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 1/296:00 am
ONT
-
LIS
2 stops19h 20m
United Airlines
Fri 2/276:10 am
LIS
-
ONT
2 stops24h 47m
United Airlines
Deal found 1/25$524
This United Airlines deal was found by Cheapflights users on 1/27. 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 11/167:00 am
ONT
-
OPO
2 stops18h 30m
United Airlines
Wed 11/2512:30 pm
OPO
-
ONT
2 stops18h 36m
United Airlines
Deal found 1/27$527
This oojo deal was found by Cheapflights users on 1/25. 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 4/2612:19 pm
ONT
-
LIS
2 stops37h 46m
British Airways
Tue 5/126:45 pm
LIS
-
ONT
2 stops31h 39m
British Airways
Deal found 1/25$538
This United Airlines deal was found by Cheapflights users on 1/27. 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 4/197:00 am
ONT
-
OPO
2 stops18h 45m
United Airlines
Wed 5/66:00 am
OPO
-
ONT
2 stops23h 58m
United Airlines
Deal found 1/27$578

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 January 27, 2026.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$492
(United Airlines)

One-way from

$264
(oojo)

Popular in

June

Cheapest in

January

Average price

$591
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 ($231 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 27, 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 3/3

8:00 am-9:30 am

2 stops17h 30m

Porto

Tue 3/10

6:00 am-10:18 pm

2 stops23h 18m

$492

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 3/2

6:00 am-9:30 am

2 stops19h 30m

Porto

Tue 3/10

6:00 am-10:18 pm

2 stops23h 18m

$492

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Mon 3/2

6:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

Sun 3/8

5:00 am-9:18 pm

2 stops24h 18m

$500

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 3/3

8:00 am-8:10 am

2 stops16h 10m

Lisbon Humberto Delgado

Tue 3/17

5:00 am-5:41 pm

2 stops19h 41m

$500

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 4/14

6:05 am-8:20 am

2 stops18h 15m

Lisbon Humberto Delgado

Tue 4/28

6:15 am-6:02 pm

2 stops19h 47m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 3/3

5:00 am-10:15 am

3 stops21h 15m

Lisbon Humberto Delgado

Thu 3/12

6:10 am-10:57 pm

2 stops23h 47m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sun 3/1

6:00 am-10:15 am

2 stops20h 15m

Lisbon Humberto Delgado

Mon 3/9

6:10 am-10:18 pm

2 stops23h 08m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Wed 2/25

8:00 am-8:10 am

2 stops16h 10m

Lisbon Humberto Delgado

Wed 3/4

6:10 am-5:41 pm

2 stops19h 31m

$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-6:02 pm

2 stops19h 47m

$502

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sun 4/19

12:19 pm-11:05 pm

2 stops26h 46m

Lisbon Humberto Delgado

Wed 4/29

7:20 am-10:35 pm

2 stops23h 15m

$508

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 57 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 $406). Flying from Ontario to Portugal in June is currently the most expensive (average of $713). 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 January 27, 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
8,119 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Comfort

7.9

Overall

7.9

Entertainment

7.8

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
8,119 reviews
Delta
7.9
Good
8,119 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Comfort

7.9

Overall

7.9

Entertainment

7.8

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
9,205 reviews
Delta
7.9
Good
8,119 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Comfort

7.9

Overall

7.9

Entertainment

7.8

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 17h 30m. United Airlines provides one of the quickest options available for as low as $492. Airlines will cover a distance of 5549 mi.

  • 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 $406). Flying from Ontario to Portugal in June is currently the most expensive (average of $713). 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 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 January 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$515Average$727FlexibilityNo cancel feeOn-time69%
DeltaCheapest$582Average$844FlexibilityNo cancel feeOn-timeN/A

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