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Portugal

$346+ 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 10/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LIS
Jun 20 — Jun 271
Sat 6/20
Sat 6/27
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 May 21, 2026.

This United Airlines deal was found by Cheapflights users on 5/16. 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.
Mon 11/97:00 am
ONT
-
OPO
2 stops18h 30m
United Airlines
Thu 11/1212:30 pm
OPO
-
ONT
2 stops18h 36m
United Airlines
Deal found 5/16$746
This Delta deal was found by Cheapflights users on 5/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/315:05 pm
ONT
-
OPO
2 stops33h 00m
Delta
Wed 12/211:15 am
OPO
-
ONT
2 stops36h 57m
Delta
Deal found 5/20$748
This United Airlines deal was found by Cheapflights users on 5/17. 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 12/15:00 am
ONT
-
OPO
2 stops20h 30m
United Airlines
Fri 12/412:35 pm
OPO
-
ONT
2 stops31h 58m
United Airlines
Deal found 5/17$755
This Delta deal was found by Cheapflights users on 5/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/25:05 pm
ONT
-
OPO
2 stops45h 25m
Delta
Wed 12/211:15 am
OPO
-
ONT
2 stops44h 33m
Delta
Deal found 5/20$757
This Delta deal was found by Cheapflights users on 5/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/305:05 pm
ONT
-
OPO
2 stops57h 00m
Delta
Wed 12/211:15 am
OPO
-
ONT
2 stops36h 57m
Delta
Deal found 5/20$759
This Delta deal was found by Cheapflights users on 5/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/305:05 pm
ONT
-
OPO
2 stops57h 00m
Delta
Thu 12/311:00 am
OPO
-
ONT
2 stops32h 27m
Delta
Deal found 5/20$766
This Delta deal was found by Cheapflights users on 5/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/17:00 am
ONT
-
OPO
2 stops18h 05m
Delta
Tue 12/15:00 am
OPO
-
ONT
2 stops26h 48m
Delta
Deal found 5/20$778
This KLM deal was found by Cheapflights users on 5/17. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/17:00 am
ONT
-
OPO
2 stops18h 05m
Multiple Airlines
Tue 12/15:40 am
OPO
-
ONT
2 stops18h 32m
Multiple Airlines
Deal found 5/17$785
This Delta deal was found by Cheapflights users on 5/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/25:05 pm
ONT
-
OPO
2 stops38h 20m
Delta
Tue 12/111:15 am
OPO
-
ONT
2 stops44h 33m
Delta
Deal found 5/20$787
This Delta deal was found by Cheapflights users on 5/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/305:05 pm
ONT
-
OPO
2 stops57h 00m
Delta
Tue 12/111:15 am
OPO
-
ONT
2 stops44h 33m
Delta
Deal found 5/20$789
This Delta deal was found by Cheapflights users on 5/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/299:55 am
ONT
-
OPO
2 stops41h 35m
Delta
Wed 12/211:15 am
OPO
-
ONT
2 stops36h 57m
Delta
Deal found 5/20$802
This Delta deal was found by Cheapflights users on 5/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2910:59 pm
ONT
-
OPO
2 stops26h 06m
Delta
Thu 12/311:00 am
OPO
-
ONT
2 stops19h 14m
Delta
Deal found 5/20$805

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 May 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$746
(United Airlines)

One-way from

$346
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$1,025
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. 25% potential increase in price ($264 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 21, 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

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 11/15

7:00 am-9:30 am

2 stops18h 30m

Porto

Thu 11/19

6:00 am-11:06 pm

2 stops25h 06m

$746

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 11/9

7:00 am-9:30 am

2 stops18h 30m

Porto

Thu 11/12

12:30 pm-11:06 pm

2 stops18h 36m

$746

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 11/8

7:00 am-9:05 am

2 stops18h 05m

Porto

Wed 11/11

5:00 am-11:48 pm

2 stops26h 48m

$748

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 11/1

7:00 am-9:05 am

2 stops18h 05m

Porto

Tue 12/1

5:00 am-4:12 pm

2 stops19h 12m

$778

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 11/1

7:00 am-9:05 am

2 stops18h 05m

Porto

Tue 12/1

5:40 am-4:12 pm

2 stops18h 32m

$785

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 11/3

6:02 am-8:10 am

2 stops18h 08m

Lisbon Humberto Delgado

Tue 12/1

6:10 am-5:47 pm

2 stops19h 37m

$878

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Fri 11/6

6:02 am-8:10 am

2 stops18h 08m

Lisbon Humberto Delgado

Wed 11/18

10:15 am-9:21 pm

2 stops19h 06m

$893

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 7/14

6:10 am-6:15 am

2 stops16h 05m

Porto

Thu 7/23

11:50 am-10:51 pm

2 stops43h 01m

$912

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Wed 8/19

1:18 pm-10:45 pm

2 stops25h 27m

Lisbon Humberto Delgado

Wed 8/26

11:25 am-7:57 pm

2 stops40h 32m

$916

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Mon 8/17

5:00 am-10:30 am

2 stops21h 30m

Lisbon Humberto Delgado

Fri 8/28

10:25 am-7:57 pm

2 stops17h 32m

$933

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/16

Showing 1-10 of 60 resultsSorted by cheapest first
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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
No data available for this route at this time. Please check back soon.

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 May 21, 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
8,452 reviews

Food

7.2

Entertainment

7.8

Overall

7.9

Boarding

8.1

Comfort

7.8

Crew

8.5

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
8,452 reviews
Delta
7.9
Good
8,452 reviews

Food

7.2

Entertainment

7.8

Overall

7.9

Boarding

8.1

Comfort

7.8

Crew

8.5

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
9,748 reviews
Delta
7.9
Good
8,452 reviews

Food

7.2

Entertainment

7.8

Overall

7.9

Boarding

8.1

Comfort

7.8

Crew

8.5

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 05m. United Airlines provides one of the quickest options available for as low as $748. 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 - Ponta Delgada Nordela 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.

See more FAQs

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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 May 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$515Average$727FlexibilityNo cancel feeOn-time69%
DeltaCheapest$582Average$1,282FlexibilityNo cancel feeOn-timeN/A

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