What is the cheapest airline that flies from California to Porto?

SWISS, Lufthansa, and United Airlines are the most popular carriers operating from California to Porto

What airlines fly to Porto?

United Airlines, TAP AIR PORTUGAL and SWISS are the top three most popular airlines that fly to Porto from California according to our data. United Airlines is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 15 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.

How long does it take to fly to Porto?

Flight times from California to Porto vary, but if you’re flying out of San Francisco and flying into Porto (one of the most popular routes), then the duration is 16h 05m on average. Another popular route from California to Porto is flying from Santa Ana to Porto, which will take roughly 16h 23m. Keep in mind that layovers or delays could extend your travel time.

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

Prices for flights from California to Porto Airport refresh daily.

How many operators does momondo search for flights from California to Porto Airport?

As of November 2025, there are 15 operators available to choose from for flights from California to Porto Airport.

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

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 California 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.

$301 Cheap Flights from California to Porto in 2025/26

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Cheap round-trip flights

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7:10 pm - 11:10 amLAX-OPO

32h 00m1 stop

12:10 pm - 4:35 pmOPO-LAX

36h 25m1 stop

$442SWISS

Find Deal

Thu, Jan 15 - Wed, Jan 28

7:10 pm - 11:10 amLAX-OPO

32h 00m1 stop

12:30 pm - 9:10 pmOPO-LAX

40h 40m2 stops

$454Multiple Airlines

Find Deal

Thu, Jan 15 - Wed, Jan 28

8:45 am - 12:50 pmSMF-OPO

20h 05m2 stops

6:00 am - 5:46 pmOPO-SMF

19h 46m2 stops

$463Lufthansa

Find Deal

Thu, Jan 8 - Thu, Jan 22

1:45 pm - 3:25 pmLAX-OPO

17h 40m1 stop

11:15 am - 11:45 amOPO-LAX

32h 30m1 stop

$483Delta

Find Deal

Thu, Jan 15 - Wed, Jan 28

1:00 pm - 4:55 pmSFO-OPO

44h 55m2 stops

10:25 am - 3:35 pmOPO-SFO

36h 10m1 stop

$485Scandinavian Airlines

Find Deal

Wed, Mar 11 - Wed, Mar 18

1:00 pm - 4:55 pmSFO-OPO

44h 55m2 stops

10:25 am - 3:35 pmOPO-SFO

36h 10m1 stop

$487Scandinavian Airlines

Find Deal

Wed, Mar 11 - Wed, Mar 18

11:10 am - 12:50 pmSAN-OPO

17h 40m2 stops

6:00 am - 9:56 pmOPO-SAN

23h 56m2 stops

$491Lufthansa

Find Deal

Thu, Jan 8 - Thu, Jan 15

9:20 pm - 10:30 amSNA-OPO

29h 10m2 stops

11:15 am - 12:25 pmOPO-SNA

57h 10m2 stops

$496Delta

Find Deal

Thu, Jan 29 - Mon, Feb 2

8:30 pm - 2:45 pmSMF-OPO

34h 15m2 stops

6:00 am - 10:13 amOPO-SMF

36h 13m2 stops

$502United Airlines

Find Deal

Thu, Feb 19 - Mon, Feb 23

5:05 am - 2:45 pmONT-OPO

25h 40m3 stops

12:30 pm - 12:17 pmOPO-ONT

31h 47m2 stops

$502United Airlines

Find Deal

Fri, Jan 9 - Fri, Jan 23

United Airlines flights from California to Porto

Our best United Airlines deals on California to Porto flight tickets

United Airlines

Jan 7

LAX12:30 amLos Angeles

27h 10m

2 stops

OPO11:40 amPorto

Jan 15

OPO6:00 amPorto

36h 32m

2 stops

LAX10:32 amLos Angeles

$499

Find similar

United Airlines

Jan 7

LAX12:30 amLos Angeles

27h 10m

2 stops

OPO11:40 amPorto

Jan 19

OPO6:00 amPorto

23h 41m

2 stops

LAX9:41 pmLos Angeles

$502

Find similar

United Airlines

Jan 8

SAN7:00 amSan Diego

20h 40m

2 stops

OPO11:40 amPorto

Jan 15

OPO6:00 amPorto

46h 47m

3 stops

SAN8:47 pmSan Diego

$514

Find similar

SWISS flights from California to Porto

Our best SWISS deals on California to Porto flight tickets

SWISS

Jan 15

LAX7:10 pmLos Angeles

32h 00m

1 stop

OPO11:10 amPorto

Jan 28

OPO12:10 pmPorto

36h 25m

1 stop

LAX4:35 pmLos Angeles

$442

Find similar

SWISS

Jan 15

LAX7:10 pmLos Angeles

32h 00m

1 stop

OPO11:10 amPorto

Jan 28

OPO12:10 pmPorto

36h 25m

1 stop

LAX4:35 pmLos Angeles

$476

Find similar

SWISS

Jan 8

LAX7:10 pmLos Angeles

28h 40m

1 stop

OPO7:50 amPorto

Jan 21

OPO12:10 pmPorto

36h 25m

1 stop

LAX4:35 pmLos Angeles

$482

Find similar

Fly from

Fly to

Route

Depart

Return

Price

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Thu 1/15

7:10 pm-11:10 am

1 stop32h 00m

Porto

Wed 1/28

12:10 pm-4:35 pm

1 stop36h 25m

$442

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Thu 1/15

7:10 pm-11:10 am

1 stop32h 00m

Porto

Wed 1/28

12:30 pm-9:10 pm

2 stops40h 40m

$454

SacramentoPorto

SMF - OPO

SMFOPO

Sacramento Intl

Thu 1/8

8:45 am-12:50 pm

2 stops20h 05m

Porto

Thu 1/22

6:00 am-5:46 pm

2 stops19h 46m

$463

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Thu 1/15

1:45 pm-3:25 pm

1 stop17h 40m

Porto

Wed 1/28

11:15 am-11:45 am

1 stop32h 30m

$483

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

1:00 pm-4:55 pm

2 stops44h 55m

Porto

Wed 3/18

10:25 am-3:35 pm

1 stop36h 10m

$485

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

1:00 pm-4:55 pm

2 stops44h 55m

Porto

Wed 3/18

10:25 am-3:35 pm

1 stop36h 10m

$487

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Thu 1/8

11:10 am-12:50 pm

2 stops17h 40m

Porto

Thu 1/15

6:00 am-9:56 pm

2 stops23h 56m

$491

Santa AnaPorto

SNA - OPO

SNAOPO

Santa Ana J. Wayne/Orange Cnty

Thu 1/29

9:20 pm-10:30 am

2 stops29h 10m

Porto

Mon 2/2

11:15 am-12:25 pm

2 stops57h 10m

$496

SacramentoPorto

SMF - OPO

SMFOPO

Sacramento Intl

Thu 2/19

8:30 pm-2:45 pm

2 stops34h 15m

Porto

Mon 2/23

6:00 am-10:13 am

2 stops36h 13m

$502

OntarioPorto

ONT - OPO

ONTOPO

Ontario

Fri 1/9

5:05 am-2:45 pm

3 stops25h 40m

Porto

Fri 1/23

12:30 pm-12:17 pm

2 stops31h 47m

$502

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from California 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

Prices

Airlines

Other information

What is the cheapest month to fly to Porto?

The month of February is, on average, the cheapest month to fly to Porto from California, with most prices found around $643. If you aren’t able to travel during the month of February, then book flights to Porto from California during January instead. Flights to Porto in January, while not as cheap as those in February, still average around $664.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Wednesday when prices can be found for as low as $942. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $1,197. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

In the evening is the cheapest time of day to fly from California to Porto when you can find flight prices for as low as $954. Flying to Porto in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $1,172 on average. Flights to Porto from California in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Porto?

You are more likely to see cheaper flights to Porto from California when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $909 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from California for as low as $767 on momondo.

Can stopping save me money on California to Porto flights?

You could potentially save up to 14% on your flight if you consider stops on a California to Porto flight.

Cheap California to Porto flight deals and tips

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

Direct flights	None

There are no direct flights from California to Porto. There are no popular flight routes from California to Porto.

Search flight deals

When did momondo last update prices for flights from California to Porto Airport?
Prices for flights from California to Porto Airport refresh daily.
How many operators does momondo search for flights from California to Porto Airport?
As of November 2025, there are 15 operators available to choose from for flights from California to Porto Airport.
How old do you have to be to fly from California to Porto Airport?
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 California 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.

Best airlines flying from California to Porto

Compare and see reviews for airlines that fly from California to Porto with momondo

Airline	Rating	Free Cancellation	Price
LEVEL	PriceFrom $402	Free Cancellation	Rating 0.0	Search LEVEL flights
Scandinavian Airlines	PriceFrom $527	Free Cancellation	Rating 7.4 1,585 reviews	Search Scandinavian Airlines flights
British Airways	PriceFrom $533	Free Cancellation	Rating 6.7 7,537 reviews	Search British Airways flights
Iberia	PriceFrom $540	Free Cancellation	Rating 7.0 3,033 reviews	Search Iberia flights
Lufthansa	PriceFrom $550	Free Cancellation	Rating 6.8 7,592 reviews	Search Lufthansa flights
TAP AIR PORTUGAL	PriceFrom $573	Free Cancellation	Rating 7.1 2,073 reviews	Search TAP AIR PORTUGAL flights
American Airlines	PriceFrom $574	Free Cancellation	Rating 7.2 11,042 reviews	Search American Airlines flights
SWISS	PriceFrom $610	Free Cancellation	Rating 7.5 1,790 reviews	Search SWISS flights
United Airlines	PriceFrom $615	Free Cancellation	Rating 7.4 9,044 reviews	Search United Airlines flights
Delta	PriceFrom $661	Free Cancellation	Rating 7.9 7,998 reviews	Search Delta flights

Vila Nova de Gaia

Coimbra

Aveiro

Matosinhos

Braga

Lamego

Guimarães

Esposende

Chaves

Espinho

Viseu

Ponte de Lima

Arcos de Valdevez

Pinhao

Curia

Penafiel

Mesao Frio

Mira

Baiao

Why use momondo?

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

It is quick and easy to find California to Porto flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Porto that suits you.

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

momondo does allow users to show only those flights to Porto from California which offer a flexible booking policy as well as other useful filters and features.

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

momondo helps you find the best flight between California and Porto by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Yes momondo offers price alerts on flights to Porto from California. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Porto trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Cheap flights from California to Porto from $301

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from California to Porto departing on 1/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

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Find the cheapest flights from California to Porto

Cheap round-trip flights

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Cheap last minute flights

United Airlines flights from California to Porto

Our best United Airlines deals on California to Porto flight tickets

SWISS flights from California to Porto

Our best SWISS deals on California to Porto flight tickets

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How to get the cheapest flight ticket from California 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 month to fly to Porto?

What is the cheapest day to depart on your flight to Porto?

What is the cheapest time of day to depart on your flight to Porto?

How far in advance should I book a flight to Porto?

Can stopping save me money on California to Porto flights?

You could potentially save up to 14% on your flight if you consider stops on a California to Porto flight.

What is the cheapest airline that flies from California to Porto?

SWISS, Lufthansa, and United Airlines are the most popular carriers operating from California to Porto

What airlines fly to Porto?

How long does it take to fly to Porto?

Cheap California to Porto flight deals and tips

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

Direct flights

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

How many operators does momondo search for flights from California to Porto Airport?

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

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

Best airlines flying from California to Porto

Compare and see reviews for airlines that fly from California to Porto with momondo

Traveling to a place near Porto?

Why use momondo?

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

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

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

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

An easier way to manage your Porto trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Portugal

Airports servicing Portugal