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Cheap flights from Ontario to Portugal from $379

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Portugal departing on 11/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Ontario to Portugal

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:45 am - 9:30 amONT  Ontario-OPO Porto
18h 45m2 stops Chicago O'Hare Intl Newark
United Airlines Logo
12:35 pm - 11:06 pmOPO  Porto-ONT Ontario
18h 31m2 stops Frankfurt am Main San Francisco
$746United Airlines
Tue, Dec 1 - Wed, Dec 9
United Airlines Logo
6:00 am - 9:30 amONT  Ontario-OPO Porto
19h 30m2 stops Houston George Bush Intcntl Newark
United Airlines Logo
12:35 pm - 11:06 pmOPO  Porto-ONT Ontario
18h 31m2 stops Frankfurt am Main San Francisco
$746United Airlines
Sun, Dec 6 - Thu, Dec 10
Delta Logo
7:00 am - 10:35 amONT  Ontario-OPO Porto
19h 35m2 stops Atlanta Hartsfield-Jackson Paris Charles de Gaulle
Delta Logo
5:00 am - 4:12 pmOPO  Porto-ONT Ontario
19h 12m2 stops Amsterdam Schiphol Salt Lake City
$747Delta
Wed, Feb 10 - Wed, Feb 17
United Airlines Logo
5:00 am - 6:55 amONT  Ontario-LIS Lisbon Humberto Delgado
17h 55m2 stops Denver Intl Montreal Pierre Elliott Trudeau Intl
United Airlines Logo
5:00 am - 5:47 pmLIS  Lisbon Humberto Delgado-ONT Ontario
20h 47m2 stops Frankfurt am Main San Francisco
$758United Airlines
Wed, Dec 9 - Wed, Jan 13
Multiple Airlines Logo
7:00 am - 8:00 amONT  Ontario-LIS Lisbon Humberto Delgado
17h 00m2 stops Atlanta Hartsfield-Jackson New York John F Kennedy Intl
Multiple Airlines Logo
11:15 am - 10:43 pmLIS  Lisbon Humberto Delgado-ONT Ontario
19h 28m2 stops New York John F Kennedy Intl Seattle/Tacoma Intl
$759Multiple Airlines
Tue, Feb 2 - Wed, Feb 10
Delta Logo
7:00 am - 8:00 amONT  Ontario-LIS Lisbon Humberto Delgado
17h 00m2 stops Atlanta Hartsfield-Jackson New York John F Kennedy Intl
Delta Logo
5:30 am - 11:00 pmLIS  Lisbon Humberto Delgado-ONT Ontario
25h 30m2 stops Paris Charles de Gaulle Seattle/Tacoma Intl
$798Delta
Tue, Nov 17 - Tue, Dec 1
United Airlines Logo
5:45 am - 8:10 amONT  Ontario-LIS Lisbon Humberto Delgado
18h 25m2 stops Houston George Bush Intcntl Newark
United Airlines Logo
10:15 am - 8:20 pmLIS  Lisbon Humberto Delgado-ONT Ontario
18h 05m2 stops Newark Denver Intl
$801United Airlines
Tue, Dec 29 - Thu, Jan 7
Delta Logo
11:54 am - 5:50 pmONT  Ontario-LIS Lisbon Humberto Delgado
21h 56m2 stops Seattle/Tacoma Intl Paris Charles de Gaulle
Delta Logo
5:00 am - 10:43 pmLIS  Lisbon Humberto Delgado-ONT Ontario
25h 43m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$820Delta
Wed, Sep 30 - Tue, Oct 6
United Airlines Logo
6:00 am - 8:10 amONT  Ontario-LIS Lisbon Humberto Delgado
18h 10m2 stops Houston George Bush Intcntl Newark
United Airlines Logo
12:20 pm - 11:06 pmLIS  Lisbon Humberto Delgado-ONT Ontario
18h 46m2 stops Washington, D.C. Dulles Intl San Francisco
$821United Airlines
Sun, Nov 15 - Sun, Dec 6
United Airlines Logo
6:45 am - 8:10 amONT  Ontario-LIS Lisbon Humberto Delgado
17h 25m2 stops Chicago O'Hare Intl Newark
United Airlines Logo
11:20 am - 6:44 pmLIS  Lisbon Humberto Delgado-ONT Ontario
39h 24m2 stops Montreal Pierre Elliott Trudeau Intl Chicago O'Hare Intl
$822United Airlines
Sun, Jan 17 - Thu, Jan 21

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American Airlines flights from Ontario to Portugal

Our best American Airlines deals on Ontario to Portugal flight tickets
American Airlines
Aug 21
ONT12:59 pmOntario
21h 01m
2 stops
LIS6:00 pmLisbon Humberto Delgado
Aug 29
LIS8:25 amLisbon Humberto Delgado
22h 34m
2 stops
ONT10:59 pmOntario
$1,187
American Airlines
Sep 1
ONT12:59 pmOntario
20h 56m
2 stops
LIS5:55 pmLisbon Humberto Delgado
Sep 8
LIS8:25 amLisbon Humberto Delgado
22h 34m
2 stops
ONT10:59 pmOntario
$1,188

United Airlines flights from Ontario to Portugal

Our best United Airlines deals on Ontario to Portugal flight tickets
United Airlines
Dec 6
ONT6:00 amOntario
19h 30m
2 stops
OPO9:30 amPorto
Dec 10
OPO12:35 pmPorto
18h 31m
2 stops
ONT11:06 pmOntario
$746
United Airlines
Dec 9
ONT5:00 amOntario
17h 55m
2 stops
LIS6:55 amLisbon Humberto Delgado
Jan 13
LIS5:00 amLisbon Humberto Delgado
20h 47m
2 stops
ONT5:47 pmOntario
$758
United Airlines
Dec 29
ONT5:45 amOntario
18h 25m
2 stops
LIS8:10 amLisbon Humberto Delgado
Jan 7
LIS10:15 amLisbon Humberto Delgado
18h 05m
2 stops
ONT8:20 pmOntario
$801

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Portugal that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 14, 2026.
Use the filters below to find and compare flights from Ontario to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioPorto

ONT Ontario - OPO Porto

ONTOPO

Ontario

Tue 12/1

6:45 am-9:30 am

2 stops18h 45m

Porto

Wed 12/9

12:35 pm-11:06 pm

2 stops18h 31m

$746

OntarioPorto

ONT Ontario - OPO Porto

ONTOPO

Ontario

Sun 12/6

6:00 am-9:30 am

2 stops19h 30m

Porto

Thu 12/10

12:35 pm-11:06 pm

2 stops18h 31m

$746

OntarioPorto

ONT Ontario - OPO Porto

ONTOPO

Ontario

Wed 2/10

7:00 am-10:35 am

2 stops19h 35m

Porto

Wed 2/17

5:00 am-4:12 pm

2 stops19h 12m

$747

OntarioLisbon

ONT Ontario - LIS Lisbon Humberto Delgado

ONTLIS

Ontario

Wed 12/9

5:00 am-6:55 am

2 stops17h 55m

Lisbon Humberto Delgado

Wed 1/13

5:00 am-5:47 pm

2 stops20h 47m

$758
Quickest round-trip

OntarioLisbon

ONT Ontario - LIS Lisbon Humberto Delgado

ONTLIS

Ontario

Tue 2/2

7:00 am-8:00 am

2 stops17h 00m

Lisbon Humberto Delgado

Wed 2/10

11:15 am-10:43 pm

2 stops19h 28m

$759

OntarioLisbon

ONT Ontario - LIS Lisbon Humberto Delgado

ONTLIS

Ontario

Tue 11/17

7:00 am-8:00 am

2 stops17h 00m

Lisbon Humberto Delgado

Tue 12/1

5:30 am-11:00 pm

2 stops25h 30m

$798

OntarioLisbon

ONT Ontario - LIS Lisbon Humberto Delgado

ONTLIS

Ontario

Tue 12/29

5:45 am-8:10 am

2 stops18h 25m

Lisbon Humberto Delgado

Thu 1/7

10:15 am-8:20 pm

2 stops18h 05m

$801

OntarioLisbon

ONT Ontario - LIS Lisbon Humberto Delgado

ONTLIS

Ontario

Wed 9/30

11:54 am-5:50 pm

2 stops21h 56m

Lisbon Humberto Delgado

Tue 10/6

5:00 am-10:43 pm

2 stops25h 43m

$820

OntarioLisbon

ONT Ontario - LIS Lisbon Humberto Delgado

ONTLIS

Ontario

Sun 11/15

6:00 am-8:10 am

2 stops18h 10m

Lisbon Humberto Delgado

Sun 12/6

12:20 pm-11:06 pm

2 stops18h 46m

$821

OntarioLisbon

ONT Ontario - LIS Lisbon Humberto Delgado

ONTLIS

Ontario

Sun 1/17

6:45 am-8:10 am

2 stops17h 25m

Lisbon Humberto Delgado

Thu 1/21

11:20 am-6:44 pm

2 stops39h 24m

$822

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Portugal from

How to get the cheapest flight ticket from Ontario to Portugal

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Portugal?

The cheapest month to fly to Portugal from Ontario is in December. Flight prices, which tend to average around $0, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of December, then book flights to Portugal from Ontario during November instead. Flights to Portugal in November, while not as cheap as those in December, still average around $676.

Cheap Ontario to Portugal flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Portugal

Fastest flight time

15h 55m

Direct flights

None
The fastest flight from Ontario to Portugal takes 15h 55m
There are no direct flights from Ontario to Portugal. There are no popular flight routes from Ontario to Portugal.
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Frequently asked questions about flying from Ontario to Portugal

  • When did momondo last update prices for flights from Ontario Airport to Portugal?

    Prices for flights from Ontario Airport to Portugal are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to Portugal?

  • How old do you have to be to fly from Ontario Airport to Portugal?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Portugal.

  • What documentation or ID do you need to fly to Portugal?

    The travel and health documents you'll need for your trip to Portugal may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Portugal. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Ontario to Portugal

Compare and see reviews for airlines that fly from Ontario to Portugal with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $515Free CancellationRating
7.4
10,108 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Portugal?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Portugal. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to Portugal with flexible booking policies on momondo?

All flight searches from Ontario to Portugal on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to Portugal?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Portugal.

I’m not ready to book a flight from Ontario to Portugal right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Portugal, momondo offers a useful price alert feature which will track prices for flights to Portugal from Ontario and alert you when they change.

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Find better results for your trip to Portugal

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