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Cheap flights from San Diego to Porto from $523

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Diego to Porto departing on 9/22. 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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Find the cheapest flights from San Diego to Porto

Cheap round-trip flights

United Airlines Logo
12:15 pm - 9:30 amSAN-OPO
14h 15m1 stop
United Airlines Logo
6:00 am - 11:38 amOPO-SAN
36h 38m2 stops
$556United Airlines
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Tue, Mar 10 - Tue, Mar 17
Multiple Airlines Logo
10:51 am - 9:30 amSAN-OPO
15h 39m2 stops
Multiple Airlines Logo
6:00 am - 8:16 pmOPO-SAN
21h 16m2 stops
$560Multiple Airlines
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Tue, Mar 10 - Tue, Mar 17
Multiple Airlines Logo
7:10 am - 9:30 amSAN-OPO
19h 20m1 stop
Multiple Airlines Logo
1:45 pm - 4:45 pmOPO-SAN
34h 00m1 stop
$562Multiple Airlines
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Tue, Mar 10 - Tue, Mar 17
Lufthansa Logo
5:35 pm - 11:40 pmSAN-OPO
22h 05m1 stop
Lufthansa Logo
6:15 am - 3:45 pmOPO-SAN
17h 30m1 stop
$629Lufthansa
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Wed, Dec 3 - Sun, Dec 7
SWISS Logo
1:05 pm - 11:10 amSAN-OPO
38h 05m2 stops
SWISS Logo
7:25 pm - 8:48 pmOPO-SAN
33h 23m2 stops
$637SWISS
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Wed, Dec 3 - Sun, Dec 7
Lufthansa Logo
5:15 pm - 11:20 pmSAN-OPO
22h 05m1 stop
Lufthansa Logo
5:15 am - 12:13 amOPO-SAN
25h 58m2 stops
$639Lufthansa
Find Deal
Wed, Oct 22 - Sun, Nov 2
Multiple Airlines Logo
4:07 pm - 6:30 pmSAN-OPO
18h 23m2 stops
Multiple Airlines Logo
5:15 am - 12:13 amOPO-SAN
25h 58m2 stops
$641Multiple Airlines
Find Deal
Wed, Oct 22 - Sun, Nov 2
Delta Logo
10:00 am - 3:30 pmSAN-OPO
21h 30m2 stops
Delta Logo
5:00 am - 12:00 pmOPO-SAN
15h 00m1 stop
$806Delta
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Sun, Oct 12 - Sun, Oct 19
KLM Logo
1:55 pm - 10:15 pmSAN-OPO
24h 20m1 stop
KLM Logo
7:00 pm - 12:00 pmOPO-SAN
25h 00m1 stop
$832KLM
Find Deal
Tue, Sep 30 - Sat, Oct 18
KLM Logo
2:00 pm - 3:35 pmSAN-OPO
17h 35m2 stops
KLM Logo
7:00 pm - 12:00 pmOPO-SAN
25h 00m1 stop
$837KLM
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Tue, Sep 30 - Sat, Oct 18

KLM flights from San Diego to Porto

Our best KLM deals on San Diego to Porto flight tickets
KLM
Sep 30
SAN1:55 pmSan Diego
24h 20m
1 stop
OPO10:15 pmPorto
Oct 18
OPO7:00 pmPorto
25h 00m
1 stop
SAN12:00 pmSan Diego
$832
Find similar
KLM
Sep 30
SAN2:00 pmSan Diego
17h 35m
2 stops
OPO3:35 pmPorto
Oct 18
OPO7:00 pmPorto
25h 00m
1 stop
SAN12:00 pmSan Diego
$837
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United Airlines flights from San Diego to Porto

Our best United Airlines deals on San Diego to Porto flight tickets
United Airlines
Mar 10
SAN12:15 pmSan Diego
14h 15m
1 stop
OPO9:30 amPorto
Mar 17
OPO6:00 amPorto
36h 38m
2 stops
SAN11:38 amSan Diego
$556
Find similar
United Airlines
Oct 22
SAN6:15 amSan Diego
19h 30m
2 stops
OPO9:45 amPorto
Nov 2
OPO5:00 amPorto
41h 28m
3 stops
SAN3:28 pmSan Diego
$730
Find similar
United Airlines
Oct 22
SAN7:28 pmSan Diego
30h 17m
3 stops
OPO9:45 amPorto
Nov 2
OPO5:00 amPorto
41h 28m
3 stops
SAN3:28 pmSan Diego
$780
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momondo Fare Finder

 
Customize your flight search to find flights from San Diego 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 September 16, 2025.
Use the filters below to find and compare flights from San Diego to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 3/10

12:15 pm-9:30 am

1 stop14h 15m

Porto

Tue 3/17

6:00 am-11:38 am

2 stops36h 38m

$556

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 3/10

10:51 am-9:30 am

2 stops15h 39m

Porto

Tue 3/17

6:00 am-8:16 pm

2 stops21h 16m

$560

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 3/10

7:10 am-9:30 am

1 stop19h 20m

Porto

Tue 3/17

1:45 pm-4:45 pm

1 stop34h 00m

$562

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Wed 12/3

5:35 pm-11:40 pm

1 stop22h 05m

Porto

Sun 12/7

6:15 am-3:45 pm

1 stop17h 30m

$629

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Wed 12/3

1:05 pm-11:10 am

2 stops38h 05m

Porto

Sun 12/7

7:25 pm-8:48 pm

2 stops33h 23m

$637

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Wed 10/22

5:15 pm-11:20 pm

1 stop22h 05m

Porto

Sun 11/2

5:15 am-12:13 am

2 stops25h 58m

$639

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Wed 10/22

4:07 pm-6:30 pm

2 stops18h 23m

Porto

Sun 11/2

5:15 am-12:13 am

2 stops25h 58m

$641

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sun 10/12

10:00 am-3:30 pm

2 stops21h 30m

Porto

Sun 10/19

5:00 am-12:00 pm

1 stop15h 00m

$806

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 9/30

1:55 pm-10:15 pm

1 stop24h 20m

Porto

Sat 10/18

7:00 pm-12:00 pm

1 stop25h 00m

$832

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 9/30

2:00 pm-3:35 pm

2 stops17h 35m

Porto

Sat 10/18

7:00 pm-12:00 pm

1 stop25h 00m

$837

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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See travel insights to Porto from

How to get the cheapest flight ticket from San Diego 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 typical price of a round-trip flight between San Diego and Porto?

What is the cheapest month to fly to Porto?

The month of February is, on average, the cheapest month to fly to Porto from San Diego, with most prices found around $648. If you aren’t able to travel during the month of February, then book flights to Porto from San Diego during January instead. Flights to Porto in January, while not as cheap as those in February, still average around $803.

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 Tuesday when prices can be found for as low as $994. 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 Thursday because tickets tend to average around $1,291. 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 afternoon is the cheapest time of day to fly from San Diego to Porto when you can find flight prices for as low as $1,004. Flying to Porto in the afternoon 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 $1,147 on average. Flights to Porto from San Diego in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

Can stopping save me money on San Diego to Porto flights?

You could potentially save up to 25% on your flight if you consider stops on a San Diego to Porto flight.

When to book flights from San Diego to Porto

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

Cheap San Diego to Porto (SAN to OPO) flight deals and tips

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

Direct flights

None
There are no direct flights from San Diego to Porto. There are no popular flight routes from San Diego to Porto.
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  • How far is San Diego to Porto by plane?

    Porto is 5600.8 mi away from San Diego. By plane, this route typically takes 14h 15m.

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

    Prices for flights from San Diego Airport to Porto Airport refresh daily.

  • How many operators does momondo search for flights from San Diego Airport to Porto Airport?

  • How old do you have to be to fly from San Diego 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 San Diego Airport to Porto Airport.

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

    The required travel and health documents for your Porto Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Porto Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from San Diego to Porto?

Best airlines flying from San Diego to Porto

Compare and see reviews for airlines that fly from San Diego to Porto with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $615Free CancellationRating
7.4
8,924 reviews
Search United Airlines flights
KLMPriceFrom $648Free CancellationRating
7.8
1,386 reviews
Search KLM flights
LufthansaPriceFrom $650Free CancellationRating
6.8
7,407 reviews
Search Lufthansa flights

Traveling to a place near Porto?

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

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from San Diego to Porto for you.

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

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

How can momondo help me find flights from San Diego to Porto?

Once you have performed a search for San Diego 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 San Diego to Porto right now. Can momondo alert me if prices change?

Yes. momondo can track prices for San Diego to Porto flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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