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Cheap flights from Ontario to Porto from $345

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 Porto departing on 10/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Ontario to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
5:00 am - 7:00 am
ONT
-
OPO
18h 00m
2 stops
United Airlines Logo
6:00 am - 8:20 pm
OPO
-
ONT
21h 20m
2 stops
$863United Airlines
Tue, Oct 20 - Tue, Oct 27
United Airlines Logo
5:45 am - 9:45 am
ONT
-
OPO
20h 00m
2 stops
United Airlines Logo
12:15 pm - 10:59 pm
OPO
-
ONT
42h 44m
2 stops
$883United Airlines
Wed, Sep 9 - Tue, Oct 6
United Airlines Logo
6:00 am - 9:45 am
ONT
-
OPO
19h 45m
2 stops
United Airlines Logo
6:00 am - 8:52 pm
OPO
-
ONT
22h 52m
2 stops
$894United Airlines
Tue, Oct 6 - Tue, Oct 13
United Airlines Logo
5:00 am - 7:00 am
ONT
-
OPO
18h 00m
2 stops
United Airlines Logo
8:55 am - 9:59 pm
OPO
-
ONT
21h 04m
2 stops
$906United Airlines
Wed, Sep 2 - Wed, Sep 16
United Airlines Logo
6:00 am - 9:45 am
ONT
-
OPO
19h 45m
2 stops
United Airlines Logo
6:00 am - 8:20 pm
OPO
-
ONT
21h 20m
2 stops
$918United Airlines
Thu, Oct 22 - Sat, Oct 31
United Airlines Logo
5:00 am - 7:00 am
ONT
-
OPO
18h 00m
2 stops
United Airlines Logo
6:00 am - 10:26 pm
OPO
-
ONT
23h 26m
2 stops
$990United Airlines
Mon, Oct 19 - Mon, Oct 26
United Airlines Logo
5:45 am - 9:45 am
ONT
-
OPO
20h 00m
2 stops
United Airlines Logo
9:00 am - 9:59 pm
OPO
-
ONT
20h 59m
2 stops
$1,030United Airlines
Sun, Aug 9 - Tue, Aug 18
United Airlines Logo
5:45 am - 6:15 am
ONT
-
OPO
16h 30m
2 stops
United Airlines Logo
9:00 am - 10:37 pm
OPO
-
ONT
21h 37m
2 stops
$1,059United Airlines
Tue, Jul 7 - Mon, Jul 20
United Airlines Logo
5:45 am - 9:45 am
ONT
-
OPO
20h 00m
2 stops
United Airlines Logo
8:55 am - 8:42 pm
OPO
-
ONT
19h 47m
2 stops
$1,061United Airlines
Wed, Jul 8 - Wed, Jul 22
Multiple Airlines Logo
2:43 pm - 4:00 pm
ONT
-
OPO
17h 17m
2 stops
Multiple Airlines Logo
12:25 pm - 10:58 pm
OPO
-
ONT
18h 33m
2 stops
$1,076Multiple Airlines
Sat, Aug 15 - Fri, Aug 28

United Airlines flights from Ontario to Porto

Our best United Airlines deals on Ontario to Porto flight tickets
United Airlines
Oct 20
ONT5:00 amOntario
18h 00m
2 stops
OPO7:00 amPorto
Oct 27
OPO6:00 amPorto
21h 20m
2 stops
ONT8:20 pmOntario
$863
United Airlines
Sep 9
ONT5:45 amOntario
20h 00m
2 stops
OPO9:45 amPorto
Oct 6
OPO12:15 pmPorto
42h 44m
2 stops
ONT10:59 pmOntario
$883
United Airlines
Oct 6
ONT6:00 amOntario
19h 45m
2 stops
OPO9:45 amPorto
Oct 13
OPO6:00 amPorto
22h 52m
2 stops
ONT8:52 pmOntario
$894

Iberia flights from Ontario to Porto

Our best Iberia deals on Ontario to Porto flight tickets
Iberia
Sep 30
ONT2:22 pmOntario
21h 38m
2 stops
OPO8:00 pmPorto
Oct 20
OPO8:20 amPorto
18h 37m
2 stops
ONT6:57 pmOntario
$1,103
Iberia
Aug 20
ONT7:06 amOntario
28h 54m
2 stops
OPO8:00 pmPorto
Sep 3
OPO8:40 pmPorto
54h 18m
2 stops
ONT6:58 pmOntario
$1,105
Iberia
Jul 8
ONT2:15 pmOntario
21h 45m
2 stops
OPO8:00 pmPorto
Jul 22
OPO4:40 pmPorto
39h 19m
2 stops
ONT11:59 pmOntario
$1,337

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Porto 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 May 11, 2026.
Use the filters below to find and compare flights from Ontario to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 10/20

5:00 am-7:00 am

2 stops18h 00m

Porto

Tue 10/27

6:00 am-8:20 pm

2 stops21h 20m

$863

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 9/9

5:45 am-9:45 am

2 stops20h 00m

Porto

Tue 10/6

12:15 pm-10:59 pm

2 stops42h 44m

$883

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 10/6

6:00 am-9:45 am

2 stops19h 45m

Porto

Tue 10/13

6:00 am-8:52 pm

2 stops22h 52m

$894

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 9/2

5:00 am-7:00 am

2 stops18h 00m

Porto

Wed 9/16

8:55 am-9:59 pm

2 stops21h 04m

$906

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Thu 10/22

6:00 am-9:45 am

2 stops19h 45m

Porto

Sat 10/31

6:00 am-8:20 pm

2 stops21h 20m

$918

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 10/19

5:00 am-7:00 am

2 stops18h 00m

Porto

Mon 10/26

6:00 am-10:26 pm

2 stops23h 26m

$990

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 8/9

5:45 am-9:45 am

2 stops20h 00m

Porto

Tue 8/18

9:00 am-9:59 pm

2 stops20h 59m

$1,030

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 7/7

5:45 am-6:15 am

2 stops16h 30m

Porto

Mon 7/20

9:00 am-10:37 pm

2 stops21h 37m

$1,059

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 7/8

5:45 am-9:45 am

2 stops20h 00m

Porto

Wed 7/22

8:55 am-8:42 pm

2 stops19h 47m

$1,061
Quickest round-trip

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sat 8/15

2:43 pm-4:00 pm

2 stops17h 17m

Porto

Fri 8/28

12:25 pm-10:58 pm

2 stops18h 33m

$1,076

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 Porto from

How to get the cheapest flight ticket from Ontario to Porto

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 airline that flies from Ontario to Porto?

Delta, United Airlines, and Air Canada are the most popular carriers operating from Ontario to Porto

What airlines fly to Porto?

TAP AIR PORTUGAL, United Airlines and Delta are the top three most popular airlines that fly to Porto from Ontario according to our data. TAP AIR PORTUGAL is the first choice among our users, with 34% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 9 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.

When to book flights from Ontario to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Porto according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Porto (ONT to OPO) flight deals and tips

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

Fastest flight time

16h 30m

Direct flights

None
The fastest flight from Ontario to Porto takes 16h 30m
There are no direct flights from Ontario to Porto. There are no popular flight routes from Ontario to Porto.
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Frequently asked questions about flying from Ontario to Porto

  • How far is Ontario to Porto by plane?

    The distance between Ontario and Porto is about 5556.9 mi. By plane, this route typically takes 16h 30m.

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

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to Porto Airport.

  • What documentation or ID do you need to fly to Porto Airport?

    The necessary travel and health documents for your Porto Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Coimbra
Braga
Aveiro
Matosinhos
Lamego
Esposende
Chaves
Pinhao
Espinho
Guimarães
Arcos de Valdevez
Ponte de Lima
Viseu
Curia
Penafiel
Mesao Frio
Mira
Baiao

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Porto from Ontario.

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

Flights from Ontario to Porto with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search for Ontario to Porto flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from Ontario to Porto now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Porto and let you know when they change.

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