$264 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 3/16. 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, 0 bags

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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$493
Porto
Porto2 stops$493
Lisbon
Lisbon2 stops$493
Porto
Porto2 stops$493

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, Jan 28 - Wed, Feb 4
United Airlines Logo
1:53 pm - 9:20 am
ONT
-
LIS
35h 27m2 stops
United Airlines Logo
11:20 am - 9:58 pm
LIS
-
ONT
42h 38m2 stops
$493United Airlines
Tue, Feb 3 - Wed, Mar 4
Delta Logo
6:00 am - 10:30 am
ONT
-
OPO
20h 30m2 stops
Delta Logo
5:00 am - 9:05 pm
OPO
-
ONT
24h 05m2 stops
$493Delta
Wed, Jan 28 - Wed, Feb 4
KLM Logo
7:30 am - 7:20 pm
ONT
-
OPO
27h 50m2 stops
KLM Logo
5:00 am - 9:05 pm
OPO
-
ONT
24h 05m2 stops
$498KLM
Sat, Mar 7 - Sun, Mar 15
Multiple Airlines Logo
6:15 am - 9:05 am
ONT
-
LIS
18h 50m2 stops
Multiple Airlines Logo
11:05 am - 10:30 pm
LIS
-
ONT
18h 25m2 stops
$498Multiple Airlines
Thu, Feb 26 - Tue, Mar 3
British Airways Logo
2:44 pm - 6:00 pm
ONT
-
LIS
19h 16m2 stops
British Airways Logo
7:05 am - 10:49 pm
LIS
-
ONT
23h 44m2 stops
$507British Airways
Wed, Feb 11 - Mon, Feb 16
KLM Logo
12:41 pm - 7:20 pm
ONT
-
OPO
22h 39m2 stops
KLM Logo
11:15 am - 4:02 pm
OPO
-
ONT
36h 47m2 stops
$598KLM
Fri, Jan 16 - Tue, Jan 20
Iberia Logo
10:58 am - 4:00 pm
ONT
-
OPO
21h 02m2 stops
Iberia Logo
8:40 pm - 2:18 pm
OPO
-
ONT
49h 38m2 stops
$955Iberia
Thu, Feb 12 - Tue, Feb 17
Iberia Logo
7:10 am - 7:40 am
ONT
-
OPO
16h 30m2 stops
Iberia Logo
8:40 pm - 10:49 pm
OPO
-
ONT
34h 09m2 stops
$990Iberia
Sun, Jan 11 - Thu, Jan 22
British Airways Logo
10:58 am - 5:00 pm
ONT
-
FAO
22h 02m2 stops
British Airways Logo
7:00 pm - 6:45 pm
FAO
-
ONT
31h 45m2 stops
$3,546British Airways
Fri, Jan 30 - Fri, Feb 27
Multiple Airlines Logo
10:58 am - 6:00 pm
ONT
-
FAO
23h 02m2 stops
Multiple Airlines Logo
9:50 am - 11:58 pm
FAO
-
ONT
22h 08m2 stops
$3,830Multiple Airlines
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 seasonNovember
Cheapest flight$264
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly and prices are also 19% lower on average.
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 9092 reviews
7.3Comfort
7.7Boarding
8.1Crew
6.6Food
7.1Entertainment
Airline reviews

from SFO-> FRA flight, AVML meal was significantly less compared to regular meal, especially no Desert, no Bread, no sides.

10.0 ExcellentAnonymous, Nov 2025
SFO - FRA
Read more United Airlines reviews

from SFO-> FRA flight, AVML meal was significantly less compared to regular meal, especially no Desert, no Bread, no sides.

This was an older airplane. The cabin was constantly warm to hot throughout the 10 hour flight and there were no vents to personalize air flow. Also since it was an older plane, the material and comfort of the chairs were very uncomfortable. I left my flight with major soreness on my tailbone.

Older aircraft, no meal, only food was for purchase. Not impressed United.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

My experience on this United Airlines flight was highly uncomfortable, primarily due to two issues: Cabin Temperature: The temperature on the Boeing 737 MAX 8 was unacceptably high, feeling consistently around 80 degrees throughout the flight. This made sleeping impossible and significantly detracted from the experience. Seating Arrangement: Being stuck in a middle seat for a six-and-a-half-hour overnight flight compounded the discomfort. Moving forward, I will always purchase a seat assignment to avoid this situation.

Premium Plus is a really good idea for longer flights

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

We were in business class. the angled seats in that class do not have a real window view & the placement of the controls are bad. But we knew that. But the food options were mediocre. The taste was fine, but the size was for a child. It’s just really feels like United is skimping on everything. Even when we were in the Polaris lounge they did not have diet sodas. They said they were out no Coke zero no Diet Coke, etc. I do not think the portion of nuts they serve on the plane could get any smaller. Really a minimal service and offer for what you’re paying for in business.

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

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

Information on your arrival and departure airports