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Cheap flights from Ontario to Porto from $393

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 11/21. 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

Find the cheapest flights from Ontario to Porto

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
6:00 am - 8:51 pmOPO  Porto-ONT Ontario
22h 51m2 stops Frankfurt am Main Denver Intl
$796United Airlines
Sun, Nov 8 - Sat, Nov 21
Multiple Airlines Logo
8:03 am - 11:25 pmONT  Ontario-OPO Porto
31h 22m2 stops San Francisco Munich Franz Josef Strauss
Multiple Airlines Logo
11:20 am - 10:49 pmOPO  Porto-ONT Ontario
43h 29m2 stops Montreal Pierre Elliott Trudeau Intl Chicago O'Hare Intl
$828Multiple Airlines
Wed, Oct 14 - Wed, Oct 21
United Airlines Logo
7:00 am - 7:00 amONT  Ontario-OPO Porto
40h 00m2 stops Chicago O'Hare Intl Montreal Pierre Elliott Trudeau Intl
United Airlines Logo
11:20 am - 10:49 pmOPO  Porto-ONT Ontario
43h 29m2 stops Montreal Pierre Elliott Trudeau Intl Chicago O'Hare Intl
$830United Airlines
Tue, Oct 13 - Wed, Oct 21
Iberia Logo
7:00 am - 7:40 amONT  Ontario-OPO Porto
16h 40m2 stops Dallas/Fort Worth Madrid Barajas
Iberia Logo
8:40 pm - 9:40 amOPO  Porto-ONT Ontario
21h 00m2 stops Madrid Barajas Dallas/Fort Worth
$834Iberia
Sun, Nov 22 - Fri, Dec 4
Delta Logo
11:15 pm - 10:30 amONT  Ontario-OPO Porto
27h 15m2 stops Atlanta Hartsfield-Jackson New York John F Kennedy Intl
Delta Logo
1:05 pm - 11:06 amOPO  Porto-ONT Ontario
30h 01m2 stops New York John F Kennedy Intl Atlanta Hartsfield-Jackson
$845Delta
Mon, Oct 12 - Tue, Oct 20
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
$847Delta
Sat, Feb 6 - Sun, Feb 14
United Airlines Logo
5:00 am - 9:45 amONT  Ontario-OPO Porto
20h 45m2 stops Denver Intl Newark
United Airlines Logo
11:50 am - 10:49 pmOPO  Porto-ONT Ontario
42h 59m2 stops Montreal Pierre Elliott Trudeau Intl Chicago O'Hare Intl
$855United Airlines
Mon, Oct 12 - Thu, Oct 22
United Airlines Logo
6:00 am - 9:30 amONT  Ontario-OPO Porto
19h 30m2 stops Houston George Bush Intcntl Newark
United Airlines Logo
6:00 am - 8:51 pmOPO  Porto-ONT Ontario
22h 51m2 stops Frankfurt am Main Denver Intl
$856United Airlines
Wed, Nov 4 - Sat, Nov 14
Delta Logo
11:15 pm - 10:30 amONT  Ontario-OPO Porto
27h 15m2 stops Atlanta Hartsfield-Jackson New York John F Kennedy Intl
Delta Logo
11:30 am - 11:55 pmOPO  Porto-ONT Ontario
43h 25m2 stops Paris Charles de Gaulle Salt Lake City
$857Delta
Mon, Oct 19 - Wed, Oct 28

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United Airlines flights from Ontario to Porto

Our best United Airlines deals on Ontario to Porto flight tickets
United Airlines
Dec 1
ONT6:45 amOntario
18h 45m
2 stops
OPO9:30 amPorto
Dec 9
OPO12:35 pmPorto
18h 31m
2 stops
ONT11:06 pmOntario
$746
United Airlines
Nov 8
ONT6:00 amOntario
19h 30m
2 stops
OPO9:30 amPorto
Nov 21
OPO6:00 amPorto
22h 51m
2 stops
ONT8:51 pmOntario
$796
United Airlines
Oct 13
ONT7:00 amOntario
40h 00m
2 stops
OPO7:00 amPorto
Oct 21
OPO11:20 amPorto
43h 29m
2 stops
ONT10:49 pmOntario
$830

Delta flights from Ontario to Porto

Our best Delta deals on Ontario to Porto flight tickets
Delta
Oct 12
ONT11:15 pmOntario
27h 15m
2 stops
OPO10:30 amPorto
Oct 20
OPO1:05 pmPorto
30h 01m
2 stops
ONT11:06 amOntario
$845
Delta
Feb 6
ONT7:00 amOntario
19h 35m
2 stops
OPO10:35 amPorto
Feb 14
OPO5:00 amPorto
19h 12m
2 stops
ONT4:12 pmOntario
$847
Delta
Oct 19
ONT11:15 pmOntario
27h 15m
2 stops
OPO10:30 amPorto
Oct 28
OPO11:30 amPorto
43h 25m
2 stops
ONT11:55 pmOntario
$857

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 August 10, 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
Quickest 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 11/8

6:00 am-9:30 am

2 stops19h 30m

Porto

Sat 11/21

6:00 am-8:51 pm

2 stops22h 51m

$796

OntarioPorto

ONT Ontario - OPO Porto

ONTOPO

Ontario

Wed 10/14

8:03 am-11:25 pm

2 stops31h 22m

Porto

Wed 10/21

11:20 am-10:49 pm

2 stops43h 29m

$828

OntarioPorto

ONT Ontario - OPO Porto

ONTOPO

Ontario

Tue 10/13

7:00 am-7:00 am

2 stops40h 00m

Porto

Wed 10/21

11:20 am-10:49 pm

2 stops43h 29m

$830

OntarioPorto

ONT Ontario - OPO Porto

ONTOPO

Ontario

Sun 11/22

7:00 am-7:40 am

2 stops16h 40m

Porto

Fri 12/4

8:40 pm-9:40 am

2 stops21h 00m

$834

OntarioPorto

ONT Ontario - OPO Porto

ONTOPO

Ontario

Mon 10/12

11:15 pm-10:30 am

2 stops27h 15m

Porto

Tue 10/20

1:05 pm-11:06 am

2 stops30h 01m

$845

OntarioPorto

ONT Ontario - OPO Porto

ONTOPO

Ontario

Sat 2/6

7:00 am-10:35 am

2 stops19h 35m

Porto

Sun 2/14

5:00 am-4:12 pm

2 stops19h 12m

$847

OntarioPorto

ONT Ontario - OPO Porto

ONTOPO

Ontario

Mon 10/12

5:00 am-9:45 am

2 stops20h 45m

Porto

Thu 10/22

11:50 am-10:49 pm

2 stops42h 59m

$855

OntarioPorto

ONT Ontario - OPO Porto

ONTOPO

Ontario

Wed 11/4

6:00 am-9:30 am

2 stops19h 30m

Porto

Sat 11/14

6:00 am-8:51 pm

2 stops22h 51m

$856

OntarioPorto

ONT Ontario - OPO Porto

ONTOPO

Ontario

Mon 10/19

11:15 pm-10:30 am

2 stops27h 15m

Porto

Wed 10/28

11:30 am-11:55 pm

2 stops43h 25m

$857

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 and Delta 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 8 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 00m

Direct flights

None
The fastest flight from Ontario to Porto takes 16h 00m
There are no direct flights from Ontario to Porto. There are no popular flight routes from Ontario to Porto.
Search flight deals

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 00m.

  • 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
Pinhao
Esposende
Lamego
Chaves
Arcos de Valdevez
Guimarães
Viseu
Espinho
Ponte de Lima
Mesao Frio
Penafiel
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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