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Portugal

$330+ 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 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LIS
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
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 March 10, 2026.

This Finnair deal was found by Cheapflights users on 3/5. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/72:08 pm
ONT
-
LIS
2 stops25h 17m
Multiple Airlines
Tue 4/146:35 am
LIS
-
ONT
2 stops35h 34m
Multiple Airlines
Deal found 3/5$583
This oojo deal was found by Cheapflights users on 3/5. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2712:55 pm
ONT
-
LIS
2 stops21h 00m
British Airways
Sat 12/127:00 am
LIS
-
ONT
2 stops23h 19m
British Airways
Deal found 3/5$625
This United Airlines deal was found by Cheapflights users on 3/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/46:00 am
ONT
-
LIS
2 stops20h 15m
United Airlines
Tue 12/86:10 am
LIS
-
ONT
2 stops38h 10m
United Airlines
Deal found 3/5$652
This Delta deal was found by Cheapflights users on 3/8. 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.
Wed 4/222:20 pm
ONT
-
OPO
2 stops23h 40m
Delta
Wed 4/295:00 am
OPO
-
ONT
2 stops20h 15m
Delta
Deal found 3/8$657
This Ovago deal was found by Cheapflights users on 3/5. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/811:59 pm
ONT
-
LIS
2 stops25h 11m
Multiple Airlines
Mon 3/1610:15 am
LIS
-
ONT
2 stops19h 03m
Multiple Airlines
Deal found 3/5$660
This United Airlines deal was found by Cheapflights users on 3/8. 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.
Sun 8/95:45 am
ONT
-
OPO
2 stops17h 10m
United Airlines
Fri 8/219:00 am
OPO
-
ONT
2 stops19h 52m
United Airlines
Deal found 3/8$665
This United Airlines deal was found by Cheapflights users on 3/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/65:45 am
ONT
-
LIS
2 stops20h 45m
United Airlines
Thu 8/2011:25 am
LIS
-
ONT
2 stops38h 54m
United Airlines
Deal found 3/5$667
This United Airlines deal was found by Cheapflights users on 3/8. 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.
Wed 12/26:02 am
ONT
-
LIS
2 stops18h 08m
United Airlines
Tue 12/86:10 am
LIS
-
ONT
2 stops19h 37m
United Airlines
Deal found 3/8$682
This United Airlines deal was found by Cheapflights users on 3/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/226:30 am
ONT
-
LIS
2 stops20h 00m
United Airlines
Tue 7/2811:25 am
LIS
-
ONT
2 stops43h 21m
United Airlines
Deal found 3/5$702
This Delta deal was found by Cheapflights users on 3/9. 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 4/195:05 pm
ONT
-
OPO
2 stops21h 10m
Delta
Sun 4/265:00 am
OPO
-
ONT
2 stops26h 44m
Delta
Deal found 3/9$703
This United Airlines deal was found by Cheapflights users on 3/7. 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.
Sat 8/157:00 am
ONT
-
LIS
2 stops17h 20m
United Airlines
Sat 8/2211:25 am
LIS
-
ONT
2 stops41h 27m
United Airlines
Deal found 3/7$711
This United Airlines deal was found by Cheapflights users on 3/9. 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 8/185:45 am
ONT
-
OPO
2 stops20h 00m
United Airlines
Wed 8/269:00 am
OPO
-
ONT
2 stops21h 58m
United Airlines
Deal found 3/9$715

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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$583
(Finnair)

One-way from

$301
(United Airlines)

Popular in

April

Cheapest in

March

Average price

$638
Provider with most accurate pricing for Ontario-Lisbon Humberto Delgado flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-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. 1% potential increase in price ($13 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 10, 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
Quickest round-trip

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 8/9

5:45 am-6:55 am

2 stops17h 10m

Porto

Fri 8/21

9:00 am-8:52 pm

2 stops19h 52m

$665

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Thu 8/6

5:45 am-10:30 am

2 stops20h 45m

Lisbon Humberto Delgado

Thu 8/20

11:25 am-6:19 pm

2 stops38h 54m

$667

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 4/19

5:05 pm-10:15 pm

2 stops21h 10m

Porto

Sun 4/26

5:00 am-11:44 pm

2 stops26h 44m

$703

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sat 8/15

7:00 am-8:20 am

2 stops17h 20m

Lisbon Humberto Delgado

Sat 8/22

11:25 am-8:52 pm

2 stops41h 27m

$711

OntarioFaro

ONT - FAO

ONTFAO

Ontario

Sun 4/19

10:15 pm-7:25 pm

2 stops37h 10m

Faro

Sun 4/26

8:00 pm-10:37 pm

2 stops34h 37m

$725

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Tue 4/7

1:27 pm-11:05 am

2 stops37h 38m

Lisbon Humberto Delgado

Tue 4/14

11:25 am-10:31 pm

2 stops43h 06m

$728

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sat 7/18

6:30 am-10:35 am

2 stops20h 05m

Lisbon Humberto Delgado

Thu 8/13

12:20 pm-10:58 pm

2 stops18h 38m

$790

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Sat 7/18

6:30 am-10:35 am

2 stops20h 05m

Lisbon Humberto Delgado

Wed 8/12

12:20 pm-10:58 pm

2 stops18h 38m

$790

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Thu 7/23

6:30 am-10:30 am

2 stops20h 00m

Lisbon Humberto Delgado

Wed 8/12

12:20 pm-10:58 pm

2 stops18h 38m

$790

OntarioLisbon

ONT - LIS

ONTLIS

Ontario

Thu 7/23

6:30 am-10:30 am

2 stops20h 00m

Lisbon Humberto Delgado

Thu 8/13

12:20 pm-10:58 pm

2 stops18h 38m

$790

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/9

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

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 March 10, 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
8,276 reviews

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.1

Entertainment

7.8

Food

7.2

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
8,276 reviews
Delta
7.9
Good
8,276 reviews

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.1

Entertainment

7.8

Food

7.2

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
9,409 reviews
Delta
7.9
Good
8,276 reviews

Crew

8.5

Comfort

7.9

Overall

7.9

Boarding

8.1

Entertainment

7.8

Food

7.2

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 10m. United Airlines provides one of the quickest options available for as low as $665. 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.

  • 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

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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 March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$515Average$727FlexibilityNo cancel feeOn-time69%
DeltaCheapest$582Average$844FlexibilityNo cancel feeOn-timeN/A

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