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Portugal

$371+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LIS
Jul 8 — Jul 151
Wed 7/8
Wed 7/15
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 June 8, 2026.

This United Airlines deal was found by Cheapflights users on 6/7. 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 10/135:00 am
ONT
-
OPO
2 stops18h 00m
United Airlines
Tue 11/176:00 am
OPO
-
ONT
2 stops22h 20m
United Airlines
Deal found 6/7$745
This United Airlines deal was found by Cheapflights users on 6/6. 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 11/157:00 am
ONT
-
OPO
2 stops18h 30m
United Airlines
Thu 12/312:35 pm
OPO
-
ONT
2 stops18h 31m
United Airlines
Deal found 6/6$746
This Delta deal was found by Cheapflights users on 6/7. 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 10/1210:59 pm
ONT
-
OPO
2 stops32h 26m
Delta
Tue 11/1711:15 am
OPO
-
ONT
2 stops38h 02m
Delta
Deal found 6/7$747
This Delta deal was found by Cheapflights users on 6/7. 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 10/117:00 am
ONT
-
OPO
2 stops19h 25m
Delta
Fri 11/205:00 am
OPO
-
ONT
2 stops19h 12m
Delta
Deal found 6/7$778
This Delta deal was found by Cheapflights users on 6/6. 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 12/137:00 am
ONT
-
OPO
2 stops18h 05m
Delta
Thu 12/3111:00 am
OPO
-
ONT
2 stops19h 14m
Delta
Deal found 6/6$785
This Delta deal was found by Cheapflights users on 6/7. 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 10/105:05 pm
ONT
-
OPO
2 stops33h 20m
Delta
Fri 11/205:00 am
OPO
-
ONT
2 stops19h 12m
Delta
Deal found 6/7$789
This United Airlines deal was found by Cheapflights users on 6/3. 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.
Fri 10/235:00 am
ONT
-
OPO
2 stops18h 10m
United Airlines
Fri 11/206:00 am
OPO
-
ONT
2 stops25h 06m
United Airlines
Deal found 6/3$795
This Delta deal was found by Cheapflights users on 6/7. 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 10/1610:59 pm
ONT
-
OPO
2 stops27h 21m
Delta
Wed 11/185:00 am
OPO
-
ONT
2 stops19h 12m
Delta
Deal found 6/7$798
This Delta deal was found by Cheapflights users on 6/7. 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 10/1612:00 pm
ONT
-
OPO
2 stops22h 10m
Delta
Mon 11/1611:15 am
OPO
-
ONT
2 stops42h 59m
Delta
Deal found 6/7$802
This United Airlines deal was found by Cheapflights users on 6/6. 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 12/146:02 am
ONT
-
OPO
2 stops19h 28m
United Airlines
Tue 12/296:00 am
OPO
-
ONT
2 stops25h 06m
United Airlines
Deal found 6/6$807
This Delta deal was found by Cheapflights users on 6/7. 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 10/1510:59 pm
ONT
-
OPO
2 stops35h 11m
Delta
Fri 11/205:00 am
OPO
-
ONT
2 stops25h 14m
Delta
Deal found 6/7$809
This United Airlines deal was found by Cheapflights users on 6/7. 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 10/145:00 am
ONT
-
OPO
2 stops20h 45m
United Airlines
Sat 11/1412:35 pm
OPO
-
ONT
2 stops31h 58m
United Airlines
Deal found 6/7$818

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 June 8, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$745
(United Airlines)

One-way from

$371
(oojo)

Popular in

June

Cheapest in

January

Average price

$1,149
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 ($265 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 June 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 June 8, 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

Wed 11/18

7:00 am-9:30 am

2 stops18h 30m

Porto

Fri 11/27

12:35 pm-11:06 pm

2 stops18h 31m

$746

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 11/15

7:00 am-9:30 am

2 stops18h 30m

Porto

Thu 12/3

12:35 pm-11:06 pm

2 stops18h 31m

$746

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 10/12

10:59 pm-3:25 pm

2 stops32h 26m

Porto

Thu 11/19

11:15 am-4:12 pm

2 stops36h 57m

$747

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Thu 10/15

10:59 pm-6:10 pm

2 stops35h 11m

Porto

Mon 11/16

11:15 am-10:14 pm

2 stops42h 59m

$809

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 10/12

5:00 am-9:45 am

2 stops44h 45m

Porto

Sat 11/14

12:35 pm-12:33 pm

2 stops31h 58m

$829

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Mon 11/2

6:02 am-8:10 am

2 stops18h 08m

Lisbon Humberto Delgado

Tue 12/1

6:10 am-5:47 pm

2 stops19h 37m

$877

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 8/30

5:05 pm-7:05 pm

2 stops18h 00m

Porto

Fri 9/11

5:00 am-4:14 pm

2 stops19h 14m

$929

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 8/31

7:00 am-7:00 am

2 stops16h 00m

Porto

Tue 9/8

9:00 am-8:01 pm

2 stops19h 01m

$935

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Mon 9/7

7:05 am-8:50 am

2 stops17h 45m

Lisbon Humberto Delgado

Tue 9/15

5:35 am-4:33 pm

2 stops18h 58m

$962

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 8/31

7:00 am-7:00 am

2 stops16h 00m

Porto

Sat 9/12

12:20 pm-8:53 pm

2 stops40h 33m

$971

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/5

Showing 1-10 of 57 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
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 June 8, 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
8,396 reviews

Comfort

7.8

Food

7.2

Overall

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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
8,396 reviews
Delta
7.9
Good
8,396 reviews

Comfort

7.8

Food

7.2

Overall

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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
9,780 reviews
Delta
7.9
Good
8,396 reviews

Comfort

7.8

Food

7.2

Overall

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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 30m. United Airlines provides one of the quickest options available for as low as $746. 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.

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 June 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$515Average$1,177FlexibilityNo cancel feeOn-time69%
DeltaCheapest$582Average$1,282FlexibilityNo cancel feeOn-timeN/A

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