$384 Find Cheap Flights from Ontario to Portugal - Compare and Save

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Cheap Flights from Ontario to Portugal

Cheapest round-trip prices found by our users on KAYAK in the last 5 days
Sort by: Cheapest
Lisbon
Lisbon
15h 30m4 stops
from $620per person
Porto
Porto
17h 05m4 stops
from $633per person
Faro
Faro
19h 50m4 stops
from $1,091per person
Ponta Delgada
Ponta Delgada
24h 40m2 stops
from $1,401per person
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Book Cheap Ontario to Portugal Plane Tickets

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Portugal

Tue, Oct 27 - Tue, Nov 3
Delta Logo
7:07 am - 9:00 amONT  Ontario-LIS Lisbon Humberto Delgado
18h 53m2 stops Atlanta Hartsfield-Jackson Boston Logan Intl
Delta Logo
11:15 am - 10:11 pmLIS  Lisbon Humberto Delgado-ONT Ontario
18h 56m2 stops Boston Logan Intl Salt Lake City
$620Delta
Mon, Oct 26 - Wed, Nov 4
Delta Logo
6:00 am - 8:00 amONT  Ontario-LIS Lisbon Humberto Delgado
19h 00m2 stops Salt Lake City New York John F Kennedy Intl
Delta Logo
11:15 am - 10:11 pmLIS  Lisbon Humberto Delgado-ONT Ontario
18h 56m2 stops Boston Logan Intl Salt Lake City
$620Delta
Tue, Oct 27 - Wed, Nov 4
Delta Logo
7:07 am - 9:00 amONT  Ontario-LIS Lisbon Humberto Delgado
18h 53m2 stops Atlanta Hartsfield-Jackson Boston Logan Intl
Delta Logo
11:15 am - 10:11 pmLIS  Lisbon Humberto Delgado-ONT Ontario
18h 56m2 stops Boston Logan Intl Salt Lake City
$620Delta
Mon, Oct 26 - Tue, Nov 3
Delta Logo
6:00 am - 8:00 amONT  Ontario-LIS Lisbon Humberto Delgado
19h 00m2 stops Salt Lake City New York John F Kennedy Intl
Delta Logo
11:15 am - 10:11 pmLIS  Lisbon Humberto Delgado-ONT Ontario
18h 56m2 stops Boston Logan Intl Salt Lake City
$620Delta
Tue, Oct 27 - Tue, Nov 3
Delta Logo
12:16 pm - 10:00 pmONT  Ontario-OPO Porto
26h 44m2 stops Atlanta Hartsfield-Jackson Paris Charles de Gaulle
Delta Logo
5:00 am - 10:11 pmOPO  Porto-ONT Ontario
25h 11m2 stops Amsterdam Schiphol Salt Lake City
$633Delta
Tue, Oct 13 - Tue, Oct 20
Delta Logo
9:45 am - 3:25 pmONT  Ontario-OPO Porto
21h 40m2 stops Salt Lake City Paris Charles de Gaulle
Delta Logo
6:15 am - 10:43 pmOPO  Porto-ONT Ontario
24h 28m2 stops Paris Charles de Gaulle Seattle/Tacoma Intl
$663Delta
Thu, Oct 29 - Thu, Nov 5
Delta Logo
11:56 am - 10:00 pmONT  Ontario-OPO Porto
27h 04m2 stops Seattle/Tacoma Intl Paris Charles de Gaulle
Delta Logo
5:00 am - 5:12 pmOPO  Porto-ONT Ontario
20h 12m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$683Delta
Mon, Sep 28 - Thu, Oct 8
Delta Logo
9:52 am - 3:25 pmONT  Ontario-OPO Porto
21h 33m2 stops Salt Lake City Paris Charles de Gaulle
Delta Logo
5:55 am - 11:55 pmOPO  Porto-ONT Ontario
26h 00m2 stops Paris Charles de Gaulle Salt Lake City
$693Delta
Wed, Nov 18 - Wed, Nov 25
United Airlines Logo
9:25 am - 10:20 amONT  Ontario-LIS Lisbon Humberto Delgado
16h 55m2 stops San Francisco Washington, D.C. Dulles Intl
United Airlines Logo
10:15 am - 8:51 pmLIS  Lisbon Humberto Delgado-ONT Ontario
18h 36m2 stops Newark Denver Intl
$771United Airlines
Mon, Sep 28 - Sat, Oct 10
United Airlines Logo
6:00 am - 8:20 amONT  Ontario-LIS Lisbon Humberto Delgado
18h 20m2 stops Houston George Bush Intcntl Newark
United Airlines Logo
12:20 pm - 10:51 pmLIS  Lisbon Humberto Delgado-ONT Ontario
18h 31m2 stops Washington, D.C. Dulles Intl San Francisco
$805United 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 is the cheapest month to fly from Ontario to Portugal?

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 April and August, when the average cost of round-trip tickets is $1,494 and $1,339 respectively.

Find deals

Good to know

Low season

November

Cheapest flight

$384
Best time to beat the crowds with an average 31% drop in price.
Most popular time to fly and prices are also 26% 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 10209 reviews
7.7Boarding
7.1Entertainment
8.1Crew
6.7Food
7.3Comfort
Airline reviews

Food was very bad Crew was not so welcoming. Chairs was so uncomfortable

2.0 MediocreAnonymous, Sep 2026
Read more United Airlines reviews

Food was very bad Crew was not so welcoming. Chairs was so uncomfortable

Flight was on time, clean, etc. Despite connecting to your wi fi I was unable to use your app to watch entertainment.

The business class had to wait to board last. Unacceptable

The air hostess was excellent. I have taken so many flight domestic and international, this is the first time the air hostess was so caring. She was a delight

Return Premium Economy section to the smaller section with comfortable seats. Add internet, upgrade the meals, and upgrade/update the Movies and Music onboard.

We paid extra to check our bags ($90*2=$180) but our luggage remained in Frankfurt. VERY DISAPPOINTED as we were promised that our luggage would go to our destination. We had to pay 90€ to take a taxi back to the airport in Split the next day to get our bags so we would not miss our next step on our trip. We think we should be reimbursed for our checked bags. How can we coordinate this?

Boarding, time to take off, in flight offerings, and staff were all great. I recommend using UA for this short flight.

This was an auto-rebook due to being delayed from an earlier UA connecting flight. The boarding was fine, but they sat me in a middle seat when my original booking was a window seat. Overall, the flight was fine as it still got me to my final destination.

The flight out of Fresno boarded 1.5 hour past scheduled and made me miss my connecting flight from SFO to SEA.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

More options for your flight from Ontario to Portugal

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