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

LEVEL is the most popular carrier operating from California to Porto

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 Los Angeles to Porto, which will take roughly 16h 29m. Keep in mind that layovers or delays could extend your travel time.

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 42% 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.

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 August 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.

$195 Cheap Flights from California to Porto in 2025

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Find the cheapest flights from California to Porto

Round-trip

One-way

Last minute

Cheap round-trip flights

4:40 pm - 4:55 pmSFO-OPO

16h 15m1 stop

5:45 pm - 2:35 pmOPO-SFO

28h 50m1 stop

$435Scandinavian Airlines

Find Deal

jue., nov. 27 - vie., dic. 5

7:40 pm - 11:00 amSFO-OPO

31h 20m1 stop

5:45 pm - 2:35 pmOPO-SFO

28h 50m1 stop

$438Scandinavian Airlines

Find Deal

lun., oct. 20 - vie., nov. 7

4:20 pm - 10:25 pmSFO-OPO

22h 05m2 stops

11:35 am - 2:45 pmOPO-SFO

35h 10m2 stops

$469

Find Deal

lun., oct. 20 - vie., nov. 7

7:45 pm - 10:05 pmLAX-OPO

18h 20m1 stop

10:50 pm - 3:30 pmOPO-LAX

24h 40m2 stops

$530

Find Deal

dom., sep. 21 - mar., oct. 7

6:45 pm - 8:10 amSFO-OPO

29h 25m2 stops

6:00 pm - 2:35 pmOPO-SFO

28h 35m1 stop

$577TAP AIR PORTUGAL

Find Deal

mar., sep. 16 - mar., sep. 23

11:45 am - 9:30 amSFO-OPO

13h 45m1 stop

12:30 pm - 8:10 pmOPO-SFO

15h 40m1 stop

$580United Airlines

Find Deal

mié., nov. 26 - mar., dic. 2

6:45 am - 9:30 amSFO-OPO

18h 45m2 stops

12:30 pm - 8:10 pmOPO-SFO

15h 40m1 stop

$584United Airlines

Find Deal

lun., nov. 24 - mar., dic. 2

7:50 pm - 9:15 pmLAX-OPO

17h 25m1 stop

8:45 am - 7:10 pmOPO-LAX

18h 25m1 stop

$589Iberia

Find Deal

mar., ene. 6 - jue., ene. 15

6:12 am - 7:40 amLAX-OPO

17h 28m2 stops

9:55 pm - 6:05 pmOPO-LAX

28h 10m1 stop

$605Iberia

Find Deal

lun., feb. 2 - lun., mar. 2

6:45 pm - 9:00 amSFO-OPO

30h 15m1 stop

10:30 pm - 2:35 pmOPO-SFO

24h 05m1 stop

$609TAP AIR PORTUGAL

Find Deal

mar., sep. 9 - mar., sep. 16

Scandinavian Airlines flights from California to Porto

Our best Scandinavian Airlines deals on California to Porto flight tickets

Scandinavian Airlines

Nov 27

SFO4:40 pmSan Francisco

16h 15m

1 stop

OPO4:55 pmPorto

Dec 5

OPO5:45 pmPorto

28h 50m

1 stop

SFO2:35 pmSan Francisco

$435

Find similar

Scandinavian Airlines

Oct 20

SFO7:40 pmSan Francisco

31h 20m

1 stop

OPO11:00 amPorto

Nov 7

OPO5:45 pmPorto

28h 50m

1 stop

SFO2:35 pmSan Francisco

$438

Find similar

Scandinavian Airlines

Oct 6

SFO7:40 pmSan Francisco

31h 20m

1 stop

OPO11:00 amPorto

Oct 22

OPO11:50 amPorto

36h 40m

1 stop

SFO4:30 pmSan Francisco

$480

Find similar

United Airlines flights from California to Porto

Our best United Airlines deals on California to Porto flight tickets

United Airlines

Nov 26

SFO11:45 amSan Francisco

13h 45m

1 stop

OPO9:30 amPorto

Dec 2

OPO12:30 pmPorto

15h 40m

1 stop

SFO8:10 pmSan Francisco

$580

Find similar

United Airlines

Nov 24

SFO6:45 amSan Francisco

18h 45m

2 stops

OPO9:30 amPorto

Dec 2

OPO12:30 pmPorto

15h 40m

1 stop

SFO8:10 pmSan Francisco

$584

Find similar

United Airlines

Nov 5

LAX10:30 amLos Angeles

15h 00m

1 stop

OPO9:30 amPorto

Nov 14

OPO6:00 amPorto

22h 51m

2 stops

LAX8:51 pmLos Angeles

$590

Find similar

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

jue. 11/27

4:40 pm-4:55 pm

1 stop16h 15m

Porto

vie. 12/5

5:45 pm-2:35 pm

1 stop28h 50m

$435

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

lun. 10/20

7:40 pm-11:00 am

1 stop31h 20m

Porto

vie. 11/7

5:45 pm-2:35 pm

1 stop28h 50m

$438

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

lun. 10/20

4:20 pm-10:25 pm

2 stops22h 05m

Porto

vie. 11/7

11:35 am-2:45 pm

2 stops35h 10m

$469

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

dom. 9/21

7:45 pm-10:05 pm

1 stop18h 20m

Porto

mar. 10/7

10:50 pm-3:30 pm

2 stops24h 40m

$530

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

mar. 9/16

6:45 pm-8:10 am

2 stops29h 25m

Porto

mar. 9/23

6:00 pm-2:35 pm

1 stop28h 35m

$577

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

mié. 11/26

11:45 am-9:30 am

1 stop13h 45m

Porto

mar. 12/2

12:30 pm-8:10 pm

1 stop15h 40m

$580

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

lun. 11/24

6:45 am-9:30 am

2 stops18h 45m

Porto

mar. 12/2

12:30 pm-8:10 pm

1 stop15h 40m

$584

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

mar. 1/6

7:50 pm-9:15 pm

1 stop17h 25m

Porto

jue. 1/15

8:45 am-7:10 pm

1 stop18h 25m

$589

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

lun. 2/2

6:12 am-7:40 am

2 stops17h 28m

Porto

lun. 3/2

9:55 pm-6:05 pm

1 stop28h 10m

$605

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

mar. 9/9

6:45 pm-9:00 am

1 stop30h 15m

Porto

mar. 9/16

10:30 pm-2:35 pm

1 stop24h 05m

$609

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 $661. If you aren’t able to travel during the month of February, then book flights to Porto from California during October instead. Flights to Porto in October, while not as cheap as those in February, still average around $771.

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 $936 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 $727 on momondo.

Can stopping save me money on California to Porto flights?

You could potentially save up to 18% 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 August 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 4.0 4 reviews	Search LEVEL flights
Iberia	PriceFrom $556	Free Cancellation	Rating 7.0 2,884 reviews	Search Iberia flights
TAP AIR PORTUGAL	PriceFrom $570	Free Cancellation	Rating 7.1 1,959 reviews	Search TAP AIR PORTUGAL flights
American Airlines	PriceFrom $574	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
SWISS	PriceFrom $610	Free Cancellation	Rating 7.6 1,702 reviews	Search SWISS flights
United Airlines	PriceFrom $615	Free Cancellation	Rating 7.4 8,930 reviews	Search United Airlines flights
Scandinavian Airlines	PriceFrom $624	Free Cancellation	Rating 7.4 1,471 reviews	Search Scandinavian Airlines flights
Vueling	PriceFrom $625	Free Cancellation	Rating 7.1 1,179 reviews	Search Vueling flights
British Airways	PriceFrom $628	Free Cancellation	Rating 6.7 7,291 reviews	Search British Airways flights
KLM	PriceFrom $648	Free Cancellation	Rating 7.8 1,388 reviews	Search KLM flights

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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.