$640 Find Cheap Flights from Portugal to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 11/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results for flights to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to Ontario, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Portugal to Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portugal to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Portugal to Ontario

mer., févr. 11 - ven., févr. 20
United Airlines Logo
5:00 am - 8:17 pmLIS-ONT
23h 17m2 stops
United Airlines Logo
6:02 am - 8:10 amONT-LIS
18h 08m2 stops
$838United Airlines
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ven., févr. 13 - mar., févr. 17
United Airlines Logo
6:10 am - 8:45 pmLIS-ONT
22h 35m2 stops
United Airlines Logo
6:00 am - 8:10 amONT-LIS
18h 10m2 stops
$849United Airlines
Find Deal
ven., févr. 13 - mar., févr. 17
United Airlines Logo
10:15 am - 12:33 pmLIS-ONT
34h 18m2 stops
United Airlines Logo
7:00 am - 8:10 amONT-LIS
17h 10m2 stops
$864United Airlines
Find Deal
mar., sept. 2 - sam., sept. 6
Delta Logo
5:40 am - 10:10 amLIS-ONT
36h 30m2 stops
Delta Logo
6:05 pm - 10:45 amONT-LIS
32h 40m2 stops
$922Delta
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lun., sept. 1 - ven., sept. 5
Delta Logo
12:10 pm - 4:08 pmLIS-ONT
35h 58m2 stops
Delta Logo
4:50 pm - 10:45 amONT-LIS
57h 55m2 stops
$934Delta
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jeu., déc. 4 - lun., déc. 8
KLM Logo
7:05 pm - 4:14 pmFAO-ONT
29h 09m2 stops
KLM Logo
10:59 pm - 9:30 amONT-FAO
26h 31m2 stops
$951KLM
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jeu., déc. 4 - lun., déc. 8
KLM Logo
7:05 pm - 4:14 pmFAO-ONT
29h 09m2 stops
KLM Logo
10:59 pm - 6:05 pmONT-FAO
35h 06m2 stops
$953KLM
Find Deal
lun., sept. 1 - ven., sept. 5
Logo
8:25 am - 12:07 amLIS-ONT
23h 42m2 stops
Logo
12:45 pm - 11:10 pmONT-LIS
26h 25m2 stops
$993
Find Deal
lun., sept. 1 - ven., sept. 5
Air France Logo
5:40 am - 7:11 pmLIS-ONT
21h 31m2 stops
Air France Logo
11:45 am - 2:50 pmONT-LIS
19h 05m2 stops
$1,008Air France
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jeu., oct. 2 - mar., oct. 7
Logo
7:40 pm - 10:33 pmFAO-ONT
34h 53m2 stops
Logo
2:51 pm - 7:10 pmONT-FAO
20h 19m2 stops
$1,042
Find Deal
Booking Insights

KAYAK's insights & trends for flights to Ontario

Get data-powered insights and trends for flights to Ontario to help you find the cheapest flights, the best time to fly and much more.

How long is the flight to Ontario?

The duration of your flight to Ontario depends on your departure and arrival airports. Obviously, any flights that include a layover will also be longer. The most popular routes to Ontario on KAYAK are from Lisbon, which takes 12h 25m, Porto, which takes 16h 05m, Ponta Delgada, which takes 16h 11m, and Faro, which takes 18h 30m.

How many direct flights to Ontario are there each day?

There are around 81 direct flights from within Portugal to Ontario every day. Most flights depart in the morning, with 8:00 am the most common departure time and 48% of flights departing in the morning.

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FAQs - booking Ontario flights

  • How far is Ontario Airport from central Ontario?

    Ontario Airport is 3 miles from the center of Ontario.

  • What is the name of Ontario’s airport?

    Ontario is served by Ontario Airport, also commonly referred to as Ontario or Ontario Intl. The airport code is ONT.

  • What is the cheapest day to fly to Ontario?

    Based on KAYAK data, the cheapest day to fly to Ontario is Thursday where round-trip tickets can be as cheap as $831. On the other hand, the most expensive day to fly is Tuesday, where round-trip prices are $848 on average.

  • How does KAYAK find such low prices on flights to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Ontario?

    The cheapest time of day to fly to Ontario is generally in the morning, when round-trip flights cost $886 on average. The most expensive time of day to fly to Ontario is generally in the morning, which is peak travel time and where the average cost of a ticket is $886.

  • How many direct flights to Ontario are there each week?

    Each week there are around 565 direct flights from within Portugal to Ontario. The most common day for departures is Sunday, with 16% of flights taking off on this day.

Top tips for finding cheap flights to Ontario

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Ontario flight deals.

Reviews of the top airline flying from Portugal to Ontario

 
See real verified KAYAK customer reviews for airlines flying to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Portugal to Ontario. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
KLMOverall score based on 1385 reviews
8.4Crew
7.3Food
7.8Boarding
7.7Comfort
7.1Entertainment
Airline reviews

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

8.0 ExcellentMark, Aug 2025BHX - AMS
Read more KLM reviews

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

The baggage drop-off in Stuttgart is bad: after online check-in you cannot use the automated baggage drop off as indicated on the website. You can use the terminals but have to cue to 1 of three open and slowly working counters to drop the bags. took about 45 minutes wait time.

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

The service was great. However the lounge only gets passing grade

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

You should not have to pay for WiFi in business class

Overall very positive. Boarding was quick and organized. Cabin was clean and seats were reasonably comfortable. Cabin crew was excellent and the meals provided were also of good quality

This fight left ahead of time which meant it arrived early which was great. Staff were very professional, but as with all these Short hop Flights the food was a disappointing snack There was no entertainment on this flight, but I did not expect any

I flew premium economy and this was a good option. Although the seats didn’t recline much, I was able to get some sleep with my head propped against the window. The food was good and the entertainment was wonderful The staff were very attentive and professional

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

Ontario (ONT)

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