$374 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 10/25. 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$891
Porto
Porto2 stops$818
Lisbon
Lisbon2 stops$891
Porto
Porto2 stops$818

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

Tue, Jul 28 - Thu, Aug 20
Multiple Airlines Logo
6:30 am - 7:00 am
ONT
-
OPO
16h 30m
2 stops
Multiple Airlines Logo
11:50 am - 9:59 pm
OPO
-
ONT
18h 09m
2 stops
$818Multiple Airlines
Tue, Aug 18 - Sat, Aug 29
Multiple Airlines Logo
7:00 am - 7:00 am
ONT
-
OPO
16h 00m
2 stops
Multiple Airlines Logo
11:20 am - 9:59 pm
OPO
-
ONT
18h 39m
2 stops
$878Multiple Airlines
Wed, Oct 14 - Tue, Nov 3
United Airlines Logo
6:05 am - 9:20 am
ONT
-
LIS
19h 15m
2 stops
United Airlines Logo
6:10 am - 8:20 pm
LIS
-
ONT
22h 10m
2 stops
$891United Airlines
Tue, Oct 20 - Sun, Nov 1
United Airlines Logo
6:00 am - 8:20 am
ONT
-
LIS
18h 20m
2 stops
United Airlines Logo
10:15 am - 8:20 pm
LIS
-
ONT
18h 05m
2 stops
$893United Airlines
Fri, Aug 14 - Thu, Aug 20
Multiple Airlines Logo
5:00 am - 7:10 am
ONT
-
OPO
18h 10m
2 stops
Multiple Airlines Logo
11:50 am - 9:59 pm
OPO
-
ONT
18h 09m
2 stops
$908Multiple Airlines
Fri, Oct 23 - Mon, Nov 2
British Airways Logo
1:31 pm - 11:10 pm
ONT
-
LIS
25h 39m
2 stops
British Airways Logo
3:50 pm - 9:59 pm
LIS
-
ONT
38h 09m
2 stops
$960British Airways
Sun, Oct 11 - Thu, Oct 15
Delta Logo
7:00 am - 7:10 pm
ONT
-
FAO
28h 10m
2 stops
Delta Logo
8:30 am - 10:43 pm
FAO
-
ONT
22h 13m
2 stops
$1,062Delta
Sun, Oct 11 - Wed, Oct 14
Delta Logo
7:00 am - 7:10 pm
ONT
-
FAO
28h 10m
2 stops
Delta Logo
8:50 am - 10:43 pm
FAO
-
ONT
21h 53m
2 stops
$1,110Delta
Fri, Oct 9 - Fri, Oct 16
British Airways Logo
2:22 pm - 5:50 pm
ONT
-
FAO
19h 28m
2 stops
British Airways Logo
7:40 pm - 5:47 pm
FAO
-
ONT
30h 07m
2 stops
$1,298British Airways
Mon, Jul 6 - Wed, Jul 15
Air Canada Logo
1:50 pm - 8:20 am
ONT
-
PDL
35h 30m
2 stops
Air Canada Logo
9:35 am - 12:47 pm
PDL
-
ONT
34h 12m
2 stops
$1,598Air Canada
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 is the cheapest month to fly from Ontario to Portugal?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Portugal, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Portugal is December, when tickets cost $0 (return) on average. On the other hand, the most expensive months are June and April, when the average cost of round-trip tickets is $1,078 and $1,049 respectively.

Find deals

Good to know

Low seasonMarch
Cheapest flight$374
Best time to beat the crowds with an average 5% drop in price.
Most popular time to fly and prices are also 17% 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.

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 9677 reviews
7.1Entertainment
7.7Boarding
8.1Crew
7.3Comfort
6.6Food
Airline reviews

Some crew were unfriendly or in some cases just straight up rude.

6.0 GoodAnonymous, Apr 2026
SFO - YVR
Read more United Airlines reviews

Some crew were unfriendly or in some cases just straight up rude.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

United Airline crews were very friendly and very attentive. 12 hours flight was gone like in a shorter one.

Food was surprisingly delicious. Space in the seat is horrible when the seating front is reclined. Movie offerings were terrible. Crew was friendly and helpful.

Flight itself excellent, but delayed so missed connection & got to destination 2 hrs later

Due to cancellation of connecting flight (Lufthansa) I didn’t fly with United

It was a red-eye, but the flight felt surprisingly quick. The seats were very comfortable, and that made resting much easier. I also want to thank the gentleman seated next to me, who graciously moved so my mom could sit beside me. We slept almost the entire way. The cabin crew was respectful in not disturbing us, while also being courteous and professional throughout. Thank you, United.

Boarding was again a "free for all". We were boarding group 4, and almost the entire plane was able to board before us. It's a shame that someone who follows the rules, gets the short end of the stick. Not fair.

It was perfect! I've never flown with United before, but I definitely will in the future

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

Information on your arrival and departure airports

Ontario (ONT)