$286 Find Cheap Flights from Ontario to Portugal

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Portugal departing on 12/6. 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

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Cheap Flights from Ontario to Portugal

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Lisbon
Lisbon2 stops$485
Porto
Porto2 stops$578
Lisbon
Lisbon2 stops$485
Porto
Porto2 stops$578

Book Cheap Ontario to Portugal Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Portugal 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 Ontario to Portugal

Wed, Feb 4 - Tue, Feb 10
Delta Logo
6:00 am - 8:00 amONT-LIS
18h 00m2 stops
Delta Logo
10:00 am - 9:14 pmLIS-ONT
19h 14m2 stops
$485Delta
Find Deal
Wed, Dec 3 - Wed, Dec 17
United Airlines Logo
6:00 am - 8:10 amONT-LIS
18h 10m2 stops
United Airlines Logo
11:00 am - 9:52 pmLIS-ONT
42h 52m2 stops
$494United Airlines
Find Deal
Thu, Jan 8 - Fri, Jan 16
Multiple Airlines Logo
7:00 am - 9:20 amONT-LIS
18h 20m2 stops
Multiple Airlines Logo
11:20 am - 10:26 pmLIS-ONT
19h 06m2 stops
$563Multiple Airlines
Find Deal
Tue, Feb 3 - Wed, Mar 4
American Airlines Logo
6:37 am - 7:40 amONT-OPO
17h 03m2 stops
American Airlines Logo
4:40 pm - 9:31 amOPO-ONT
24h 51m2 stops
$578American Airlines
Find Deal
Thu, Jan 8 - Mon, Jan 19
Multiple Airlines Logo
7:00 am - 9:20 amONT-LIS
18h 20m2 stops
Multiple Airlines Logo
11:20 am - 10:26 pmLIS-ONT
19h 06m2 stops
$613Multiple Airlines
Find Deal
Fri, Jan 9 - Wed, Jan 14
Iberia Logo
8:43 am - 8:00 pmONT-OPO
27h 17m2 stops
Iberia Logo
8:20 am - 10:02 pmOPO-ONT
21h 42m2 stops
$668Iberia
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Sun, Feb 15 - Sun, Mar 15
KLM Logo
6:00 am - 10:30 amONT-OPO
20h 30m2 stops
KLM Logo
11:25 am - 4:19 pmOPO-ONT
35h 54m2 stops
$715KLM
Find Deal
Fri, Jan 9 - Wed, Jan 14
American Airlines Logo
10:57 am - 8:00 pmONT-OPO
25h 03m2 stops
American Airlines Logo
8:40 pm - 5:53 pmOPO-ONT
29h 13m2 stops
$718American Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
KLM Logo
11:48 am - 8:35 amONT-FAO
37h 47m2 stops
KLM Logo
7:05 pm - 7:19 pmFAO-ONT
32h 14m2 stops
$720KLM
Find Deal
Wed, Jan 7 - Wed, Jan 21
Iberia Logo
10:57 am - 11:50 amONT-LIS
16h 53m2 stops
Iberia Logo
4:45 pm - 1:48 pmLIS-ONT
29h 03m2 stops
$733Iberia
Find Deal
Booking Insights

KAYAK's insights & trends for Ontario to Portugal flights

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

What’s the cheapest day of the week to fly from Ontario to Portugal?

The average price of all round-trip flights from Ontario to Portugal clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Portugal on a Tuesday and more expensive on a Saturday. On your return trip to Ontario, you should consider flying back on a Thursday, and avoid Tuesdays for better deals.

Good to know

Low seasonMarch
Cheapest flight$286
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly with an average 6% increase in price.
Flight from Ontario to Lisbon

FAQs - booking Portugal flights

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

    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 from Ontario to Portugal.

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

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

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

    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 from Ontario to Portugal 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 from Ontario to Portugal?

    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 from Ontario to Portugal 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 Portugal?

    The cheapest time of day to fly to Portugal is generally in the evening, when round-trip flights cost $1,054 on average. Morning departures are around 5% more expensive than evening flights, on average. The most expensive time of day to fly to Portugal is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $1,230.

Reviews of the top airline flying from Ontario to Portugal

 
Need help choosing which airline to fly with from Ontario to Portugal? 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.
7.4
United AirlinesOverall score based on 8929 reviews
7.1Entertainment
7.7Boarding
7.3Comfort
8.1Crew
6.6Food
Airline reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

2.0 MediocreAnonymous, Sep 2025SFO - MEX
Read more United Airlines reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

From the first moment you interact with United Airlines, you can expect nothing less but extreme frustration. The baggage handler at the bag drop seems completely unbothered by the presence of customers waiting in line. No help was extended to load the baggage whatsoever. And if any of your bags is overweight by 0.01 pound they will make you re-distribute everything in your suitcase just to play power trip. When it was time to board no help was extended to customers to locate their seats. Moreover. It was a chaotic mess at the gate when it was unclear who should board first and everyone just bunched up, trying to get on the plane. I am sure the crew was doing their best to perform their jobs while being paid their wages however it shouldn’t be that hard to smile once or twice when you’re in the business if serving customers. It is a shame for the United States of America to have a flagship carrier of such low caliber. Our flight was also delayed by about an hour and a half due to further delays prior to our inbound flight. Being someone who has travelled for both business and leisure in Asia, Europe, and South America I have never experienced such poor quality of service.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

The pilots were late and it made us 1 hour late. The meat was tough and bok choy was also tough.

Stuck on tarmac for two hours plus a 5.5 hour flight. Rude flight attendant. And no meals, not even for purchase!

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

The best airline I have ever travel , really good customer service, attention and service !!

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

Not a great experience. We paid for the upgrade for premium economy seats and seated ourselves in very comfortable seats. Someone came along with the same seat on their boarding pass. The aircraft had been changed and as a result we were booted out and sent further back to small uncomfortable seats. After complaining we were moved to emergency row seats, which gave us more leg room but the seats don’t recline. For people in our 70’s we found having to sit upright from California to NJ very uncomfortable. Not sure why they chose to move senior citizens instead of the two people that were allowed to take the more comfortable seats. Not happy.

Everything was great. Only thing that could’ve made it better was buy on board options for hot food, but the snacks were decent. The flight attendants were great. I had no complaints. I was able to make it to my destination safely

Everything you need to know for your flight from Ontario to Portugal

Information on your arrival and departure airports

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