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Cheap flights from Ontario to Porto from $411

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 9/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 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.
KLM Logo
5:05 pm - 10:15 pm
ONT
-
OPO
21h 10m
2 stops
KLM Logo
5:55 am - 9:00 pm
OPO
-
ONT
23h 05m
2 stops
$744KLM
Wed, Apr 22 - Wed, May 6
United Airlines Logo
5:00 am - 7:00 am
ONT
-
OPO
42h 00m
3 stops
United Airlines Logo
2:25 pm - 10:26 pm
OPO
-
ONT
40h 01m
2 stops
$773United Airlines
Tue, Sep 22 - Wed, Oct 7
Delta Logo
2:20 pm - 10:00 pm
ONT
-
OPO
23h 40m
2 stops
Delta Logo
5:00 am - 10:34 pm
OPO
-
ONT
25h 34m
2 stops
$787Delta
Wed, May 6 - Wed, May 13
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
$825United Airlines
Mon, Aug 10 - Mon, Aug 24
United Airlines Logo
7:13 pm - 7:00 am
ONT
-
OPO
27h 47m
2 stops
United Airlines Logo
2:25 pm - 5:18 pm
OPO
-
ONT
34h 53m
2 stops
$835United Airlines
Tue, Sep 8 - Wed, Oct 14
United Airlines Logo
8:00 am - 7:00 am
ONT
-
OPO
39h 00m
2 stops
United Airlines Logo
11:50 am - 11:06 pm
OPO
-
ONT
43h 16m
2 stops
$840United Airlines
Sun, Sep 6 - Thu, Oct 15
United Airlines Logo
5:45 am - 6:55 am
ONT
-
OPO
41h 10m
2 stops
United Airlines Logo
11:50 am - 11:06 pm
OPO
-
ONT
43h 16m
2 stops
$848United Airlines
Mon, Sep 7 - Thu, Oct 15
United Airlines Logo
5:45 am - 9:45 am
ONT
-
OPO
20h 00m
2 stops
United Airlines Logo
9:00 am - 10:58 pm
OPO
-
ONT
21h 58m
2 stops
$851United Airlines
Tue, Aug 18 - Wed, Aug 26
Delta Logo
7:00 am - 6:20 pm
ONT
-
OPO
27h 20m
2 stops
Delta Logo
11:35 am - 11:48 pm
OPO
-
ONT
44h 13m
2 stops
$852Delta
Tue, Sep 8 - Tue, Oct 13
Delta Logo
5:55 pm - 7:15 pm
ONT
-
OPO
41h 20m
2 stops
Delta Logo
5:00 am - 4:12 pm
OPO
-
ONT
19h 12m
2 stops
$858Delta
Sat, Sep 5 - Wed, Oct 14

Turkish Airlines flights from Ontario to Porto

Our best Turkish Airlines deals on Ontario to Porto flight tickets
Turkish Airlines
Sep 5
ONT11:59 pmOntario
25h 41m
2 stops
OPO9:40 amPorto
Oct 13
OPO10:40 amPorto
42h 49m
2 stops
ONT9:29 pmOntario
$897
Turkish Airlines
Sep 17
ONT10:56 pmOntario
64h 34m
2 stops
OPO11:30 pmPorto
Sep 21
OPO6:30 amPorto
46h 59m
2 stops
ONT9:29 pmOntario
$968
Turkish Airlines
Sep 7
ONT11:59 pmOntario
50h 01m
2 stops
OPO10:00 amPorto
Sep 21
OPO6:30 amPorto
46h 59m
2 stops
ONT9:29 pmOntario
$993

Delta flights from Ontario to Porto

Our best Delta deals on Ontario to Porto flight tickets
Delta
May 6
ONT2:20 pmOntario
23h 40m
2 stops
OPO10:00 pmPorto
May 13
OPO5:00 amPorto
25h 34m
2 stops
ONT10:34 pmOntario
$787
Delta
Sep 8
ONT7:00 amOntario
27h 20m
2 stops
OPO6:20 pmPorto
Oct 13
OPO11:35 amPorto
44h 13m
2 stops
ONT11:48 pmOntario
$852
Delta
Sep 5
ONT5:55 pmOntario
41h 20m
2 stops
OPO7:15 pmPorto
Oct 14
OPO5:00 amPorto
19h 12m
2 stops
ONT4:12 pmOntario
$858

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 March 26, 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

Wed 4/22

5:05 pm-10:15 pm

2 stops21h 10m

Porto

Wed 5/6

5:55 am-9:00 pm

2 stops23h 05m

$744

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 9/22

5:00 am-7:00 am

3 stops42h 00m

Porto

Wed 10/7

2:25 pm-10:26 pm

2 stops40h 01m

$773

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Wed 5/6

2:20 pm-10:00 pm

2 stops23h 40m

Porto

Wed 5/13

5:00 am-10:34 pm

2 stops25h 34m

$787
Quickest round-trip

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 8/10

5:45 am-9:45 am

2 stops20h 00m

Porto

Mon 8/24

9:00 am-9:59 pm

2 stops20h 59m

$825

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 9/8

7:13 pm-7:00 am

2 stops27h 47m

Porto

Wed 10/14

2:25 pm-5:18 pm

2 stops34h 53m

$835

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sun 9/6

8:00 am-7:00 am

2 stops39h 00m

Porto

Thu 10/15

11:50 am-11:06 pm

2 stops43h 16m

$840

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Mon 9/7

5:45 am-6:55 am

2 stops41h 10m

Porto

Thu 10/15

11:50 am-11:06 pm

2 stops43h 16m

$848

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 8/18

5:45 am-9:45 am

2 stops20h 00m

Porto

Wed 8/26

9:00 am-10:58 pm

2 stops21h 58m

$851

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Tue 9/8

7:00 am-6:20 pm

2 stops27h 20m

Porto

Tue 10/13

11:35 am-11:48 pm

2 stops44h 13m

$852

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Sat 9/5

5:55 pm-7:15 pm

2 stops41h 20m

Porto

Wed 10/14

5:00 am-4:12 pm

2 stops19h 12m

$858

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?

United Airlines, Delta, and British Airways 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 33% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 11 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 55m

Direct flights

None
The fastest flight from Ontario to Porto takes 16h 55m
There are no direct flights from Ontario to Porto. There are no popular flight routes from Ontario to Porto.
Search flight deals

  • 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 55m.

  • 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
Aveiro
Braga
Matosinhos
Lamego
Esposende
Chaves
Pinhao
Guimarães
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
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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