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$343+ Cheap flights from San Diego (SAN) to Porto (OPO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — OPO
Apr 25 — May 21
Sat 4/25
Sat 5/2
1 adult, Economy
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Cheap flight deals from San Diego to Porto

Cheapest flights from San Diego to Porto
Explore the most affordable flight options available from San Diego to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 26, 2026.

This Air Canada deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1812:35 pm
SAN
-
OPO
2 stops34h 25m
Air Canada
Tue 1/126:00 am
OPO
-
SAN
2 stops36h 53m
Air Canada
Deal found 3/24$715
This FlightHub deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/184:55 pm
SAN
-
OPO
2 stops30h 05m
Multiple Airlines
Tue 1/121:45 pm
OPO
-
SAN
1 stop34h 00m
Multiple Airlines
Deal found 3/24$719
This CheapOair deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1810:40 pm
SAN
-
OPO
2 stops24h 20m
Multiple Airlines
Tue 2/167:20 pm
OPO
-
SAN
2 stops34h 37m
Multiple Airlines
Deal found 3/22$725
This Delta deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/71:05 pm
SAN
-
OPO
2 stops18h 20m
Delta
Tue 10/135:00 am
OPO
-
SAN
1 stop14h 50m
Delta
Deal found 3/23$731
This KLM deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/187:00 am
SAN
-
OPO
1 stop19h 30m
KLM
Tue 1/125:00 am
OPO
-
SAN
1 stop15h 05m
KLM
Deal found 3/24$740
This Justfly.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/215:15 pm
SAN
-
OPO
1 stop22h 10m
Lufthansa
Tue 4/286:20 am
OPO
-
SAN
1 stop17h 05m
Lufthansa
Deal found 3/23$754
This Delta deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/219:47 am
SAN
-
OPO
2 stops21h 38m
Delta
Tue 4/285:00 am
OPO
-
SAN
1 stop14h 50m
Delta
Deal found 3/23$757
This Delta deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/57:00 am
SAN
-
OPO
1 stop19h 30m
Delta
Fri 10/165:00 am
OPO
-
SAN
2 stops21h 55m
Delta
Deal found 3/26$787
This Gurufare deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/215:15 pm
SAN
-
OPO
1 stop22h 10m
Multiple Airlines
Tue 4/2812:15 pm
OPO
-
SAN
2 stops42h 44m
Multiple Airlines
Deal found 3/25$788

Find flight deals from San Diego to Porto

Discover tips and strategies to find the most affordable flight options for your journey from San Diego (SAN) to Porto (OPO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$715
(Air Canada)

One-way from

$343
(United Airlines)

Popular in

August

Cheapest in

February

Average price

$822
Provider with most accurate pricing for San Diego-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Diego-Porto flights.
Search Deals
From San Diego to Porto
Search Deals
One-way flight from San Diego to Porto
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($158 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated March 26, 2026.
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

Cheapest round-trip
Quickest round-trip

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 8/18

7:00 am-10:30 am

1 stop19h 30m

Porto

Tue 1/12

5:00 am-12:05 pm

1 stop15h 05m

$740

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 7/27

6:40 am-6:55 am

1 stop16h 15m

Porto

Tue 8/4

12:15 pm-5:20 pm

2 stops37h 05m

$817

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 5/11

2:30 pm-6:10 pm

2 stops19h 40m

Porto

Mon 5/18

7:00 pm-11:50 am

1 stop24h 50m

$841

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 9/14

6:35 am-6:55 am

1 stop16h 20m

Porto

Wed 9/30

2:25 pm-7:52 pm

2 stops37h 27m

$867

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 9/15

1:40 pm-6:20 pm

1 stop20h 40m

Porto

Wed 9/30

7:10 pm-11:50 am

1 stop24h 40m

$874

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Thu 9/10

1:21 pm-11:30 pm

2 stops26h 09m

Porto

Sat 9/19

6:15 am-11:56 pm

2 stops25h 41m

$897

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Thu 9/10

6:20 am-10:30 am

2 stops20h 10m

Porto

Sat 9/19

5:00 am-11:50 am

1 stop14h 50m

$954
Cheapest one-way
Quickest one-way

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Wed 8/19

6:35 am-6:55 am

1 stop16h 20m

$368

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 9/14

7:40 pm-8:05 pm

1 stop16h 25m

$431

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sat 4/18

8:05 pm-7:20 am

3 stops51h 15m

$435

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

Compare providers for flights from San Diego to Porto

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Diego to Porto in March.
ProviderPrice AccuracyTrust Score*
OvagoPrice Accuracy2 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on San Diego-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Diego-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Diego-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Diego-Porto flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Diego-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from San Diego to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from San Diego with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Diego to Porto

What is the cheapest month to book a flight from San Diego to Porto?

Currently, March is the cheapest month in which you can book a flight from San Diego to Porto (average of $559). Flying from San Diego to Porto in July is currently the most expensive (average of $1,009). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from San Diego to Porto?

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Porto. Reviews last updated March 26, 2026.
Peruse reviews from past customers who have flown with KLM,United Airlines, andLufthansa from San Diego to Porto to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,478 reviews

Entertainment

7.1

Comfort

7.6

Overall

7.8

Crew

8.4

Food

7.3

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
KLM
7.8
Good
1,478 reviews
KLM
7.8
Good
1,478 reviews

Entertainment

7.1

Comfort

7.6

Overall

7.8

Crew

8.4

Food

7.3

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
United Airlines
7.4
Good
9,489 reviews
KLM
7.8
Good
1,478 reviews

Entertainment

7.1

Comfort

7.6

Overall

7.8

Crew

8.4

Food

7.3

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Lufthansa
6.8
Okay
7,871 reviews
KLM
7.8
Good
1,478 reviews

Entertainment

7.1

Comfort

7.6

Overall

7.8

Crew

8.4

Food

7.3

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

Related info for your journey

Find useful and relevant information for your journey from San Diego to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from San Diego to Porto?

    For as low as $824, KLM can have you in Porto from San Diego in 17h 50m. The distance between San Diego and Porto is about 5596 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from San Diego to Porto round-trip?

    Flying on KLM is currently your cheapest option to Porto, with prices starting at $585. Additional round-trip tickets that might be worth considering are offered by Lufthansa and United Airlines, with the lowest prices starting at $611 and $615, respectively. You may be able to fly from San Diego to Porto for 36% less than the average price by searching for these airlines.

  • Can I find deals for flights from San Diego to Porto that include hotel bookings?

    Yes. In addition to deals on San Diego to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Diego to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Diego to Porto.

  • Can I find deals for business class flights from San Diego to Porto?

    Yes. Cheapflights offers flight deals from San Diego to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Diego to Porto?

    Currently, March is the cheapest month in which you can book a flight from San Diego to Porto (average of $559). Flying from San Diego to Porto in July is currently the most expensive (average of $1,009). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from San Diego to Porto

Discover the top 3 airlines that operate flights from San Diego to Porto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$585Average$849FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$611Average$877FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$615Average$1,192FlexibilityNo cancel feeOn-time69%

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